A student carries out this chemical reaction in a beaker: zn cucl2 → cu zncl2. after the reaction has come to completion, what should the student expect to find in the beaker? a. zn and cucl2 b. zn, cucl2, cu, and zncl2 c. cu and zncl2 d. zncl2 only

Answers

Answer 1

The student will expect to find copper metal at bottom of the beaker with aqueous solution of zinc chloride. the correct option is C.

How to find ?

After the reaction between Zinc and copper(II) chloride, Zinc chloride and copper will be obtained as a product. This reaction occurs because zinc is more reactive than copper which displaces the copper from its aqueous solution.

what is chemical reaction ?

When two or more molecules combine to create a new product, the process is known as a chemical reaction (s). Reactants are substances that interact to make new substances, whereas products are those substances that result from the interaction.

what is chemical equation ?

A chemical equation is a symbol- and formula-based symbolic representation of a chemical reaction, with the reactant entities given on the left side and the product entities given on the right. Examples are NaOH+HClNaCl+H2O.

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Related Questions

Evaluate each scenario described to determine the direction of heat flow. A glass of ice water. Ice cube to tap water tap water to ice cube.

Answers

To determine the direction of heat flow in each scenario, we need to consider the temperature difference between the objects involved.

Heat always flows from an object at a higher temperature to an object at a lower temperature until thermal equilibrium is reached.

1. A glass of ice water:

In this scenario, the glass of ice water consists of two components: the ice and the water. The ice has a temperature below 0°C (32°F), while the water is at or slightly above 0°C (32°F). The surroundings, including the air and the glass, are generally at a higher temperature than the ice.

Heat flow: The heat flows from the surroundings (air and glass) to the ice and water to increase their temperature and melt the ice. Therefore, heat flows into the glass of ice water.

2. Ice cube to tap water:

In this scenario, the ice cube is at a temperature below 0°C (32°F), while the tap water is typically at room temperature or slightly higher.

Heat flow: The heat flows from the tap water to the ice cube because the tap water has a higher temperature than the ice cube. The heat from the water raises the temperature of the ice cube, causing it to melt. Therefore, heat flows into the ice cube from the tap water.

3. Tap water to ice cube:

In this scenario, the tap water is at room temperature or slightly higher, while the ice cube is at a temperature below 0°C (32°F).

Heat flow: The heat flows from the ice cube to the tap water because the tap water has a lower temperature than the ice cube. The heat from the ice cube lowers the temperature of the tap water, causing it to cool down. Therefore, heat flows out of the ice cube to the tap water.

In summary:

- In a glass of ice water, heat flows into the glass of ice water.

- In the interaction between an ice cube and tap water, heat flows from the tap water to the ice cube.

- In the interaction between tap water and an ice cube, heat flows from the ice cube to the tap water.

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explain why the ability of plp to catalyze an amino acid transformation is greatly reduced if a plp-requiring enzymatic reaction is carried out at a ph at which the pyridine nitrogen is not protonated.

Answers

The ability of pyridoxal phosphate (PLP) to catalyze an amino acid transformation is greatly reduced when the pH is such that the pyridine nitrogen is not protonated.

Pyridoxal phosphate (PLP) is a coenzyme that plays a crucial role in many enzymatic reactions involving amino acids. It acts as a cofactor by forming a Schiff base with the amino acid substrate, facilitating the transfer of functional groups. The catalytic activity of PLP is highly dependent on the protonation state of its pyridine nitrogen.

When PLP-requiring enzymatic reactions are carried out at a pH where the pyridine nitrogen is not protonated, the ability of PLP to effectively catalyze amino acid transformations is significantly reduced. This is because the protonation of the pyridine nitrogen is necessary for the formation of the Schiff base intermediate.

The protonation of the pyridine nitrogen creates a positively charged species that enhances the electrophilic character of the PLP molecule. This allows for efficient nucleophilic attack by the amino acid substrate, leading to the formation of the Schiff base. In the absence of protonation, the electron distribution in the PLP molecule is altered, impairing its ability to form the necessary covalent bond with the substrate.

The pH of the environment plays a critical role in determining the protonation state of molecules. At lower pH values, the pyridine nitrogen of PLP is more likely to be protonated, promoting catalytic activity. However, as the pH increases, the pyridine nitrogen becomes deprotonated, diminishing the catalytic efficiency of PLP.

In summary, the ability of PLP to catalyze amino acid transformations is greatly reduced when the pH is such that the pyridine nitrogen is not protonated. The protonation of the pyridine nitrogen is essential for the formation of the Schiff base intermediate, which is a key step in PLP-dependent enzymatic reactions.

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according to rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is blank the number of positively charged particles within the nucleus, so a nitrogen atom has 7 protons and 7 electrons, while a phosphorous atom cannot have 15 protons and 150 electrons.

Answers

According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is equal to the number of positively charged particles within the nucleus.

Rutherford's nuclear hypothesis states that ratio of negatively charged particles outside nucleus to positively charged particles inside the nucleus is one-to-one. This implies that the number of protons and electrons in an atom is equal. An atom with an atomic number of 7 has 7 protons and 7 electrons, which suggests it is a nitrogen atom.

The negative charge of electrons in an electron cloud encircling the nucleus balances the positive charge of the protons in the nucleus to produce a neutral atom. However, the periodic table indicates that phosphorus has an atomic number of 15, which corresponds to a total of 15 protons. There would be 15 electrons in a neutral phosphorus atom to counteract the protons' positive charge.

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Using the formula M1V1 = M2V2 , how many milliliters of a 2. 50 M hydrochloric acid solution is required to make 100. 0 mL of a 0. 750 M solution?.

Answers

Dilution of the solution can be calculated by the formula of the molarity and volume. The initial volume of 2.50 M solution was 30 mL.

What is the relationship between molar concentration and dilution?

Molar concentration or the dilution factor is in an inverse relationship and with an increase in the dilution, the molarity of the solution decreases.

Given,

Initial molarity = 2.50 M

initial volume = ?

Final molarity = 0.750 M

Final volume = 100.0 ml

Substituting values in the formula:

\(\begin{aligned}\rm V_{1} &= \rm \dfrac{M_{2}V_{2}}{M_{1}}\\\\&= \dfrac{0.750 \times 100}{2.50}\\\\&= 30 \;\rm mL\end{aligned}\)

Therefore, 30 mL was the initial volume of the solution before it was diluted.

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Calculate the mass percent of carbon nitrogen and oxygen in acetamide

Answers

Please click above answer.

The mass percent of a molecule shows the amount each element contributes to the total molecular mass. So, acetamide is 40.7% Carbon, 23.7% Nitrogen, 27.1% Oxygen, and 8.5% Hydrogen.

Calculate the mass percent of carbon nitrogen and oxygen in acetamide
Calculate the mass percent of carbon nitrogen and oxygen in acetamide
Calculate the mass percent of carbon nitrogen and oxygen in acetamide

What is the mass, in grams, of the object being measured in the triple beam balance shown below?
A. 220 grams
B. 223 grams
C. 230 grams
D. 250 grams

What is the mass, in grams, of the object being measured in the triple beam balance shown below?A. 220

Answers

Answer:

B. 223 grams

Explanation:

Look at the largest weight first: 200 grams

Look at the 2nd largest: 20 grams

Look at the smallest: 3 grams

200 + 20 + 3 = 223 grams

Answer:

223 grams

Explanation:

A CaCl2 solution with a mass of 50.0 grams contains 30.0% CaCl2. This solution reacts with 35.0 grams of AgNO3, one of the products is the precipitate AgCl. Calculate the following: a.) The excess material and the grams of excess material b.) The moles of AgCl produced c.) The grams of Ca(NO3)2 produced

Answers

a. AgNO3 is the reaction's surplus ingredient. The amount of AgNO3 utilised in the process, 35.0 grammes, is represented by the surplus material.

Therefore, 35.0 grammes of extra material are present. b.) The molar mass of AgCl may be used to compute the moles of AgCl that were created. AgCl has a molar mass of 143.32 g/mol. As a result, 0.245 moles of AgCl were created.

c.) The molar mass of Ca(NO3)2 may be used to compute the grammes of Ca(NO3)2 produced. Ca(NO3)2 has a molar mass of 164.09 g/mol. As a result, 3.91 grammes of Ca(NO3)2 were generated.

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1. Select the correct statement: a. Colour of the transition metal ions arises due to d-d transition b. Colour of certain oxysalts of transition metals is due to charge transfer c. Both are correct d. None is correct.

Answers

Answer:

Both are correct

Explanation:

Metals of the d-block have five degenerate d orbitals. However, in the presence of ligands, these orbitals are no more degenerate and they split into sets of degenerate orbitals depending on the nature of the ligands and the geometry of the complex formed.

Hence it is possible for electrons to undergo d-d transitions when this occurs leading to the unique color of some transition metal ions.

Also, charge transfer accounts for the color of oxysalts such as KMnO4 where the d-d transition band is weak.

This data table shows how quickly rope will rot away in freshwater and saltwater. what can you conclude about the rates of the rotting reaction?

A. The reaction occurs more slowly when the concentration of salt is higher.
B. The reaction occurs more quickly when the concentration of salt is higher.
C. The reaction occurs at the same rate, regardless of the concentration salt.
D. There is not enough information to conclude anything about the reaction rates.

This data table shows how quickly rope will rot away in freshwater and saltwater. what can you conclude

Answers

The conclusion about the rates of the rotting reaction from the table would be that the reaction occurs more quickly when the concentration of salt is higher—option B.

What is the reaction rate?

The rate of reaction, or reaction rate, is the time it takes for a reaction to occur. In other words, it is the time it takes for the reactants of a reaction to become products.

In this case, the reactant is the rope and the product is the rotten product of the rope. From the table, it took 10 years for the rope to decay in a lake. On the other hand, it took the same rope just 4 years to decay in an ocean.

The difference between the two water bodies is the presence of salt. The lake has almost zero salt while the conentration of salt in the ocean water is high.

Thus, the conclusion about the rate of rotting reaction would be that the reaction is hastened by the presence of salt in the ocean water.

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rusting is the common name for the corrosion of iron or steel. the brown-orange rust commonly seen on iron or steel cars, nails, chains, or posts has the formula fe2o3. what is its iupac name?

Answers

Rust is known as Iron (III) Oxide according to the IUPAC, and its chemical formula is Fe2O3.

What is the rusting of iron called?

Iron rusting is a chemical change since it involves the interaction of two substances to create a new one. Iron oxide is created during the rusting process by the reaction of iron and oxygen molecules.

Rust is described as the reddish brown layer that frequently develops on particular kinds of metal. These metals rust when they are exposed to air and moisture. The red material is created as a result of this combination's chemical reaction.

Rust's scientific name is iron oxide; its chemical formula is \($${Fe_2O_3}\). Metals that rust are those made of iron or iron alloys like steel. A chemical reaction takes place over time when iron comes into touch with airborne oxygen and water. This reaction creates iron oxide as a new chemical. The reddish hue of Mars is due to the abundance of iron oxide, which is present in nature and also on Mars.

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Question 53
The general type of subsurface formation in which groundwater contamination is likely to travel the farthest is:
a. Clay b. Granite
c. Limestone
d. gravel

Answers

The correct answer is c. Limestone. This is because limestone is a porous rock that can easily allow groundwater to flow through it, allowing contamination to travel farther distances compared to other subsurface formations like clay, granite, and gravel.

Additionally, the chemical composition of limestone can also make it more susceptible to certain types of contamination, such as from acidic or alkaline substances.
 The general type of subsurface formation in which groundwater contamination is likely to travel the farthest is:
d. Gravel

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Where to start as a beginner in chemistry?​

Answers

Answer:

Maybe try a Course Outline or talk to a professional for advice.

Explanation:

I recommend studying/memorizing the Periodic Table and polyatomics!

50g of water were heated to boiling point at constant rate of 2.28KJ/minute.after boiling for 10minutes, the mass of water decreased to 40g calculate the heat of vaporization of water

Answers

Answer:

10g of water was vaporized by the 2.28K/J

50g of water were heated to boiling point at constant rate of 2.28KJ/minute.after boiling for 10minutes,

Acetic acid (CH 3 COOH) reacts with water to form the acetate ion and the hydronium ion: CH 3 COOH(aq)+H 2 O(l) leftrightarrow CH 3 COO^ - (aq)+H 3 O^ + (aq) At equilibriumthe concentration of CH 3 COOH is 2. 0 * 10 ^ - 1 * M the concentration of CH 3 COO^ - 1. 9 * 10 ^ - 3 * M and the concentration of H 3 O^ + is 1. 9 * 10 ^ - 3 * M What is the value of K eq for this reaction? 1. 8 * 10 ^ - 5 5. 5 * 10 ^ 4 9. 5 * 10 ^ - 3 1. 1 * 10 ^ 2

Answers

The value of K_eq for this reaction is approximately 1.805 × 10^-5.

To find the value of the equilibrium constant (K_eq) for the given reaction, we can use the equilibrium concentrations of the species involved. The equilibrium constant expression for the reaction is:

K_eq = [CH3COO-][H3O+] / [CH3COOH]

Given the following concentrations at equilibrium:

[CH3COOH] = 2.0 × 10^-1 M

[CH3COO-] = 1.9 × 10^-3 M

[H3O+] = 1.9 × 10^-3 M

Substituting these values into the equilibrium constant expression, we get:

K_eq = (1.9 × 10^-3)(1.9 × 10^-3) / (2.0 × 10^-1)

K_eq = 3.61 × 10^-6 / 2.0 × 10^-1

K_eq = 3.61 × 10^-6 × 5.0 × 10^0

K_eq = 1.805 × 10^-5

Therefore, the value of K_eq for this reaction is approximately 1.805 × 10^-5.

None of the provided answer choices match this value exactly.

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Throughout, make sure you have a copy of the Student Guide and your data table. Using logarithms, you determined the of 7 solutions ranging from strong acid to neutral to strong base.

Answers

To determine the pH values of the 7 solutions ranging from strong acid to neutral to a strong base, the logarithmic scale known as the pH scale is employed. Logarithms are used to determine the pH values of solutions on the pH scale. The pH scale ranges from 0 to 14, with 0 being the most acidic and 14 being the most basic.

It can be concluded that logarithms were used to determine the pH values of 7 solutions ranging from strong acid to neutral to a strong base. It is important to have a copy of the Student Guide and the data table throughout the experiment to ensure accuracy and consistency.

A pH of 7 is neutral. The pH value of a solution can be determined using the following formula:

pH = -log[H+],

where[H+] is the concentration of hydrogen ions in moles per liter (M). If the pH is less than 7, the solution is acidic. If the pH is greater than 7, the solution is basic.

As the given question is incomplete, the complete question is "Throughout, make sure you have a copy of the Student Guide and your data table. Using logarithms, you determined the of 7 solutions ranging from strong acid to neutral to a strong base. What method did you use to determine the pH values of the 7 solutions, ranging from strong acid to neutral to a strong base, and how did you apply logarithms in the process? "

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James W. is a 65-year-old male hospitalized with dehydration secondary to a severe case of covid. He is 72 inches tall and weighs 196 pounds, down 25 pounds from his usual of one month ago. Currently his temperature is normal.

1. Calculate James’s BMI and determine his health risk status based on his weight classification. 26.6 kg/m^2

BMI = (weight in pounds x 703) / (height in inches x height in inches).

2. Assuming his usual body weight is 221 pounds, what percent weight change has he experienced? State his weight as a percentage of his usual weight. 12.75%

3. Categorize the patient’s risk of malnutrition based on weight change

4. Using an ideal body weight of 130 pounds, calculate his resting energy needs using the Mifflin–St. Jeor equation

Men: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5.

Women: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161.

Remember to convert pounds to kilograms by dividing by 2.2. Multiply the height in inches by 2.54 to convert to centimeters.

4. Use the acceptable macronutrient distribution range, calculate the grams of fat and carbohydrate that you would recommend.

5. Calculate James’s daily protein requirement based on 1.0 gram per kilogram of his ideal body weight.

Answers

1.  James falls into the "Overweight" category.

2. James has experienced a weight loss of approximately 11.32% compared to his usual weight.

3. A high risk of malnutrition.

4. James's estimated resting energy needs are approximately 1713 calories per day.

5. Daily protein requirement = 59 grams of protein per day

1. To calculate James's BMI (Body Mass Index), we'll use the formula:

BMI = (weight in pounds x 703) / (height in inches x height in inches)

BMI = (196 pounds x 703) / (72 inches x 72 inches)

BMI = 137,588 / 5,184

BMI = 26.6 kg/m^2

Based on the weight classification categories, James falls into the "Overweight" category.

2. To determine the percentage weight change, we'll use the formula:

Percentage weight change = [(current weight - usual weight) / usual weight] x 100

Percentage weight change = [(196 pounds - 221 pounds) / 221 pounds] x 100

Percentage weight change = (-25 pounds / 221 pounds) x 100

Percentage weight change = -0.1132 x 100

Percentage weight change = -11.32%

James has experienced a weight loss of approximately 11.32% compared to his usual weight.

3. To categorize the patient's risk of malnutrition based on weight change, we need to consider the percentage weight change. Generally, a weight loss of more than 10% is considered significant and may indicate a high risk of malnutrition. In James's case, with a weight loss of 11.32%, he would be categorized as having a high risk of malnutrition.

4. To calculate James's resting energy needs using the Mifflin-St. Jeor equation, we'll use the formula for men:

Resting energy needs = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5

Converting weight from pounds to kilograms:

Weight in kg = 196 pounds / 2.2

Weight in kg = 89 kg

Converting height from inches to centimeters:

Height in cm = 72 inches x 2.54

Height in cm = 182.88 cm

Resting energy needs = (10 x 89 kg) + (6.25 x 182.88 cm) - (5 x 65 years) + 5

Resting energy needs = 890 + 1143 - 325 + 5

Resting energy needs = 1713 calories per day

James's estimated resting energy needs are approximately 1713 calories per day.

5. To calculate James's daily protein requirement based on 1.0 gram per kilogram of his ideal body weight, we'll use his ideal body weight of 130 pounds:

Ideal body weight in kg = 130 pounds / 2.2

Ideal body weight in kg = 59 kg

Daily protein requirement = 1.0 gram/kg x 59 kg

Daily protein requirement = 59 grams of protein per day.

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What can cause an offspring to have a physical trait neither of its parents has?

Answers

Answer: The main way that an offspring can exhibit a different physical trait than its parents is due to the fact of genetic mutation.

Explanation: A mutation within a parents sex cells can cause different traits to be shown in the offspring because these genetic mutations cause DNA to form that has crucial differences to the original DNA composition which can manifest itself as differences in physical characteristics. These can be not so serious mutations (such as someone being born with an extra finger) or they can be more serious such as leg or arm mutations which can mean arms can be crooked or shorter than they are supposed to be. I hope this has been of assistance to you and if you have any further questions please do not hesitate to ask :)

The homogeneity of the chloride level in a water sample from a lake was tested by analyzing portions drawn from the top and from near the bottom of the lake, with the following results
Top (ppm Cl)
Bottom (ppm Cl)
26.30
26.22
26.43
26.32
26.28
26.20
26.19
26.11
26.49
26.42
Apply the t-test at the 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom.
Now use the paired t-test and determine whether there is a significant difference between the top and bottom values at the 95% confidence level.
Why is a different conclusion drawn from using the paired t- test than from just pooling the data and using the normal t- test for differences in means?

Answers

The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

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100 cm³ of a gas at 27°C is cooled to 20°C at constant pressure .Calculate the volume of gas at 20°C.

Answers

Answer:\(97.67\operatorname{cm}^3\)

Explanations:

According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

\(\begin{gathered} V\alpha T \\ V=kT \\ k=\frac{V}{T} \\ k=\frac{V_1}{T_1}=\frac{V_2}{T_2} \end{gathered}\)

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

\(\begin{gathered} V_1=100\operatorname{cm}^3 \\ T_1=27^0C=27+273=300K \\ T_2=20^0C=20+273=293K \\ V_2=\text{?} \end{gathered}\)

Substitute the given parameters into the formula;

\(\begin{gathered} V_2=\frac{V_1T_2}{T_1}^{} \\ V_2=\frac{100\times293}{300} \\ V_2=\frac{29300}{300} \\ V_2=\frac{293}{3} \\ V_2=97.67\operatorname{cm}^3 \end{gathered}\)

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Which chemical equation is correctly balanced?
O Mg(NO3)2 + 2K2CO3 →→ MgCO3 + 2KNO3
O Mg(NO3)2 + K2CO3 → MgCO3 + 2 KNO3
2Mg(NO3)2 + K2CO3 - 2MgCO3 + KNO3
Mg(NO3)2 + K2CO3
MgCO3 + KNO3

Answers

Answer:

Mg (NO3)2+ K2CO3 ⇒ Mg CO3 + KNO3

Mg=1 ,N =2, O =6 +3 9 ,K =2 ,C=1 ,  (reactant side)

Mg =1, C = 1  ,O = 3+3 = 6 , K= 1., N =1 (product side)

Mg(NO3)2 + K2CO3  ⇒ Mg CO3 + 2KNO3

Mg =1 , C = 1, O =3+6=9, K = 2 IN product side

ANS:

Mg (NO3)2 +K2CO3 ⇒ MgCO3 +2 KNO3

Explanation:

a student incorrectly names a compound as 4,6-diethyl-5-heptene. the correct iupac name of this compound is ________.

Answers

5-Ethyl-3-methyloct-3-ene is the IUPAC name of the substance. Alkenes are organic substances with a functional group made up of a carbon-carbon double bond. Alkenes can be named according to a logical set of rules, just like any other chemical substance.

According to this iupac method, the names of organic compounds are written using the IUPAC names of alkanes, which are straight-chain molecules containing all of the carbon atoms. An analog alkane or similar alkane is one such substance. The structure, common name, and IUPAC name of each of these alkane's atoms are listed below. The main benefit of a method is that it does not require memorizing the names of all organic compounds; instead, it just requires remembering a few rules and the names of the aforementioned alkanes.

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PLEASE HELP
What is the sum of all the coefficients in this reaction when properly balanced?

Lead (II) nitrate + hydrogen sulfide yields lead (II) sulfide + nitric acid (HNO3)

Answers

Answer:

5

Explanation:

The properly balanced chemical equation for this is:

Pb(NO₃)₂ + H₂S → PbS + 2HNO₃

The coefficients in order are 1, 1, 1, and 2.

Therefore, 1+1+1+2=5

The sum of the coefficients added up is 5.

1
What is the sum of all the protons and neutrons in an atom?

Answers

Answer:

Mass number.

Explanation:

The sum of the number of protons and neutrons in an atom is called the mass number.

For example: Carbon-12 has 12 protons and 12 neutrons.

- Sophia

Newtons third law explains what happens when two objects-

Answers

Answer:

When one object uses force to move the other.

Explanation:

This is called Thrust.Thrust is used in airplane engines,or an engine can be  a source of Thrust,we use our legs to Thrust us forward when we walk!

Sir Isaac Newton's third law explains that for every action, or force, in nature, there is an equal and opposite reaction.

Hope that helps!

What is the final volume of 13.35 L of gas if the initial pressure of the gas is 75.98 kPa is changed to 2.00 atm? (L)

Answers

Given:V1 = 13.35LP1 = 75.98kPa = 0.75atmP2 = 2.00 atm

▪︎ Assuming temperature constant!

To Find:V2 = ?Solution:

According to Boyles Law

P1V1=P2V2(Temp. constant)

So,

0.75×13.35 = 2.00×V2

V2 = (0.75×13.35)/2.00

V2 = 10.0125/2.00

V2 = 5.00625L

_____________________

Thank you!:)

Which of these is Not a sign that a chemical change has occurred?
A. a loss of transparency
B. a temperature change
C. an unexpected color change
D. The formation of a precipitate

Answers

Answer: c

Explanation:

An unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

What is chemical change?

A chemical change is defined as the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances.

There are basically five types of chemical reaction.

Combination reactionDecomposition reactionDisplacement reactionDouble displacement reactionSynthesis reaction

Thus, an unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

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define noble gases ? ​

Answers

Answer:

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore they rarely react with other elements since they are already stable

for a tlc run on a silica gel plate, using an appropriate solvent and uv visualization, which do you expect to have the lowest rf value, and which will have the highest rf value? explain.

Answers

For a tlc run on a silica gel plate, using an appropriate solvent and uv visualization, polar compounds are expected to have the lowest rf value, and non-polar compounds will have the highest rf value.

TLC stands for thin layer chromatography. It's a popular technique for separating and identifying chemical compounds in a mixture. A thin layer of adsorbent material, such as silica gel, is placed on a glass plate or plastic sheet. A small amount of the mixture to be separated is then placed near the bottom of the plate.

A solvent is added to the bottom of the plate, which is then allowed to migrate up the plate via capillary action. As the solvent moves up the plate, it will carry the mixture with it. Each component in the mixture will move up the plate to a different extent based on its polarity and its affinity to the adsorbent. The higher a compound's RF value, the further it travels up the plate.

Lower RF values are associated with polar compounds that have a greater affinity for the adsorbent. Conversely, higher RF values are associated with non-polar compounds that have a lower affinity for the adsorbent. Therefore, non-polar compounds will travel the furthest, while polar compounds will travel the least.

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What are the basic principles of the Cyclical Model Theory? *


A-the universe had no begging nor will there be an end

B-the matter is created at the same rate of the expansion of the universe

C-do universe begin with the big bang from a singularity containing all the mass and energy of the universe

D- the universe begin with the big bang and end with a big corn sure of the universe expansion is reversed

What are the basic principles of the Cyclical Model Theory? *A-the universe had no begging nor will there

Answers

The basic principle of the Cyclical Model Theory is the universe begins with the big bang and ends with a big corn sure of the universe's expansion is reversed.

The correct option is D.

What is the cyclical model theory?

The Cyclical Model Theory proposes that the universe undergoes an infinite series of cycles, with each cycle, beginning with a "big bang" and ending with a "big crunch". After the big crunch, the universe undergoes a period of contraction until it becomes a singularity, which then expands again in another big bang, starting the cycle anew.

This theory assumes that the universe is eternal and that the cycle of birth, growth, decay, and rebirth repeats indefinitely.

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1. How many valence electrons does lodine
have?

Answers

lodine has 7 valence electron
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