Answer:
100 degree celcius, because it is the melting point of ice ob
Answer: The correct answer is 100 °C, because it is the boiling point of water.
Explanation: A heating curve has two flat lines(Or plateaus). The first one is the melting point, the second one is the boiling point. In your problem, C is the second flat line, so it is boiling point.
How does the vacuole help the cell survive? (function)
Answer:
it stores water for the cell
Name the following compounds:
The correct name of the given compound is 2 methyl butane, and 2 - methyl-2- pentene.
The suffix '-ane' is used for alkanes, '-ene' for alkenes, and 'yne' for alkynes. For instance, C₂H₆ is referred to as ethane, C₂H₄ is referred to as ethene, and C₂H₂ is referred to as ethyne.
In order to get to the double- or triple-bonded carbon atom first, the parent chain is numbered.
In hydrocarbons, the suffix -ene is used in place of -ane to denote double bonds. The suffix is expanded to add a prefix that denotes the number of double bonds present if there are more than one double bond.
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Limiting line of balmer series result when electron jumps from orbitImmersive Reader
A) 3 to 2
B) ∞ to 2
C) 4 to 5
D) ∞ to 1
Answer:
A) 3 to 2
Explanation:
The Balmer series refers to all transition series of spectral emission lines of the hydrogen atom in which an electron moves from any higher energy level within the atom down to the energy level with principal quantum number n=2.
The Balmer series was originally calculated using the Balmer formula, this is an empirical equation first deduced by Johann Balmer in 1885.
Hence, a transition from n=3 level to n=2 level is in the Balmer series.
How many oxygen atoms are in the formula Tetrasulfur pentoxide?
a. 3
b. 4
c. 5
d. 2
The change in mass during a nuclear reaction is given
by which equation?
Select one:
A
B
C
D
Answer:c
Explanation:
c
What is Decomposition Reaction
Answer:
Explanation:
Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.
The decomposition reaction can be represented by the general equation:
AB → A + B
Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.
There are different types of decomposition reactions, including:
Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):
CaCO3 → CaO + CO2
Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):
2H2O → 2H2 + O2
Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:
Cl2 → 2Cl
These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.
Answer:
Explanation:
reaction in which a compound breaks down into simpler substances or elements
If 35 grams of HCl were dissolved in enough water to make a solution with a total volume of 5.0 liters, what would be the molarity of the solution?
Answer: 0.19 M
Explanation:
The gram formula mass of HCl is 36.46 g/mol, so 35 grams of HCl is about 35/36.46 = 0.96 moles.
molarity = (moles of solute)/(liters of solution) = 0.96 / 5.0 = 0.19 M
Molarity (M) = 0.961 moles / 5.0 liters ≈ 0.1922 mol/L
The molarity of the solution is approximately 0.1922 mol/L or 0.1922 M.
To calculate the molarity (M) of the solution, we need to use the formula:
Molarity (M) = Number of moles of solute / Volume of solution (in liters)
Given that 35 grams of HCl are dissolved in 5.0 liters of water, we first need to find the number of moles of HCl using its molar mass.
The molar mass of HCl (hydrochloric acid) is the sum of the atomic masses of hydrogen (H) and chlorine (Cl):
Molar mass of HCl = 1.01 g/mol (H) + 35.45 g/mol (Cl) = 36.46 g/mol
Now, we can calculate the number of moles of HCl:
Number of moles = Mass of HCl / Molar mass of HCl
Number of moles = 35 g / 36.46 g/mol ≈ 0.961 moles
Finally, we can calculate the molarity of the solution:
Molarity (M) = 0.961 moles / 5.0 liters ≈ 0.1922 mol/L
The molarity of the solution is approximately 0.1922 mol/L or 0.1922 M.
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modern eucaryotes depend on mitochondria to generate most of the cell's ATP. how many molecules of ATP can a single molecule of glucose generate?
a. 30
b. 2
c. 20
d. 36
A single molecule of glucose can generate approximately 36 molecules of ATP. So, the correct answer is: d. 36
How to determine the molecules of ATP?Modern eukaryotes rely on mitochondria for the production of the majority of their ATP (adenosine triphosphate), which serves as a critical energy source for cellular processes.
This energy generation occurs through cellular respiration, a process that breaks down glucose molecules.
A single molecule of glucose can generate approximately 36 molecules of ATP through the process of glycolysis, the citric acid cycle (also known as the Krebs cycle or TCA cycle), and oxidative phosphorylation within the mitochondria. Hence the answer of the question is option D. 36
These stages work together to efficiently produce ATP, with the final step, oxidative phosphorylation, contributing the most significant portion of the ATP generated.
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identify the acid associated with each conjugate base. nh3 choose... I⁻ ___
SO4²⁻ ___
Cl⁻ ___ OH⁻ ___
F⁻ ___
a. HF
b. Water
c. Sulfuric acid d. Hydronium ion e. HCI f. НІ g. Bisulfate ion
The acid associated with \(NH_3\) is \(NH_4^+\), with I- is HI, with \(SO_4^{2-}\) is \(HSO_4^-\), with Cl- is HCl, with OH- is \(H_2O\), and with F- is HF.
1. NH3: It is a base that accepts a hydrogen ion (H+) from an acid. \(NH_3 + H^+ --> NH_4^+\). The acid associated with \(NH_3\) is \(NH_4^+\).
2. I-: is a base that accepts a hydrogen ion (H+) from an acid. \(I^- + H^+ --> HI\) . The acid associated with I- is HI.
3. \(SO_4^{2-}\) : is a base that accepts a hydrogen ion (H+) from an acid. \(SO_4^{2-} + H^+ --> HSO_4^-\). The acid associated with \(SO_4^{2-}\) is \(HSO_4^-\).
4. Cl-: is a base that accepts a hydrogen ion (H+) from an acid. Its conjugate acid is the species formed when Cl- accepts a hydrogen ion (H+). \(Cl^- + H^+ --> HCl\). The acid associated with Cl- is HCl.
5. OH-: It is a base that accepts a hydrogen ion (H+) from an acid. Its conjugate acid is the species formed when OH- accepts a hydrogen ion (H+). \(OH^- + H^+ --> H_2O\). The acid associated with OH- is \(H_2O\).
6. F-: It is a base that accepts a hydrogen ion (H+) from an acid. \(F^- + H^+ --> HF\). The acid associated with F- is HF.
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The Lyman series results from excited state hydrogen atoms transiting to
the ground state by emitting electromagnetic radiation.
a. In total, how many spectral lines will result if a sample of hydrogen is excited into the fourth
excited state? (Hint: draw a small energy level diagram and use arrows to represent
transitions from higher to lower energy states.
b. How many of the lines from the previous answer belong to the Lyman series?
c. Calculate the energy for each of the lines in the Lyman series that you identified in the last
answer. (Recall that the energy of the light emitted represents the difference between two
energy states of the atom.)
Answer:
I can't draw diagrams on this web site but I can do with numbers I think. So an electron is moved from n = 1 to n = 5. I'm assuming I've interpreted the problem correctly; if not you will need to make a correction. I'm assuming that you know the electron in the n = 1 state is the ground state so the 4th exited state moves it to the n = 5 level.
n = 5 4th excited state
n = 4 3rd excited state
n = 3 2nd excited state
n = 2 1st excited state
n = 1 ground state
Here are the possible spectral lines.
n = 5 to 4, n = 5 to 3, n = 5 to 2, n = 5 to 1 or 4 lines.
n = 4 to 3, 4 to 2, 4 to 1 = 3 lines
n = 3 to 2, 3 to 1 = 2 lines
n = 2 to 1 = 1 line. Add 'em up. I get 10.
b. The Lyman series is from whatever to n = 1. Count the above that end in n = 1.
c.The E for any level is -21.8E-19 Joules/n^2
To find the E for any transition (delta E) take E for upper n and subtract from the E for the lower n and that gives you delta E for the transition.
So for n = 5 to n = 1, use -Efor 5 -(-Efor 1) = + something which I'll leave for you. You could convert that to wavelength in meters with delta E = hc/wavelength. You might want to try it for the Balmer series (n ending in n = 2). I think the red line is about 650 nm.
Explanation:
a chemical reaction in which bonds are broken is usually associated with
the release of energy
which characteristic of bones is often very different from one individual to another?
a. the number of bones
b. the cellular make up of the bones
c. the size of the bones
d. the composition of the bones
An unknown substance with a mass of 5 grams releases 16.1 joules of energy when undergoing a temperature decrease of 7 degrees Celsius. What is the specific heat of that substance and what substance is it?
Answer:
0.46 J/g degrees C, Iron
Explanation:
16.1 J = 5 g x c x 7 degrees C
c = 16.1 / 5 x 7 = 0.46
Answer: 0.46 J/g degrees C, Iron
Identify by element's full name.
Answer:
1.a member of carbon family with 14 eletrons is silicon
2.halide which is liquid at room temperature is bromine
3.transition metal with 79 electrons/protons and neutron 80 for me Is Gold
What is the purpose of sulfuric acid in a Fischer esterification reaction?
Sulfuric acid is added to Fischer's esterification reaction as an acid catalyst to increase the pace of the reaction while also going about as a drying-out specialist.
The Fischer esterification is an acid-catalyzed harmony reaction. The reaction proceeds slowly and adding sulfuric acid increases the pace of the reaction. Concentrated sulfuric acid is used to give the greatest yield to the item.
Fischer esterification or Fischer-Speier esterification is a special sort of esterification by refluxing a carboxylic acid and a liquor in the presence of an acid catalyst. The reaction was first described by Emil Fischer and Arthur Speier in 1895. Fischer esterification is a natural reaction used to change a carboxylic acid and a liquor over completely to an ester using a strong acid catalyst. It is also known as Fischer-Speier Esterification.
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A student was adding soda and vinegar in a bottle they then put a balloon on top of the bottle immediately after adding them together the student observed that the balloon inflated and got larger The student then predicted that the chemical reaction between the vinegar and the baking soda had created a brand new matter and would have more mass at the end of the reaction would you agree with the student’s prediction or not Explain your answer
Answer:
They then put a balloon on top of the bottle immediately after adding them together. The student observed that the balloon inflated and got larger.
Explanation:
Btw brainliest me plss
Answer:
The student's prediction is wrong. Mass cannot be spontaneously created.
Explanation:
Sorry, but all the other answers are wrong. They didn't even come close to answering your question. This question concerns ourselves with the law of mass conservation. This states that, in a reaction, the total mass of the reactants must equal the total mass of products formed after the reaction. For instance, if the mass of the reactants both weighed 5 grams, then the products, if you measured their weight afterwards, would be 5 grams. The reaction does not generate new mass at the end of the reaction, this cannot be done for any reaction, let alone this one. Thank you!
35 POINTSSSSSS which solution will exhibit the smallest increase in boiling point compared to plain water? 4.0 m ch2o 0.5 KOH 0.5 al(no3)3
Answer: The answer is 0.5 M AIN
Question 11
Which formula represents a hydrocarbon?
C₂H6
C₂H5OH
C₂H5Cl
C₂H6O
Answer:
C₂H6
Explanation:
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A
A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:
A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.
B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.
D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.
In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A
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Ella holds an ice cream cone in her hand. She soon notices that her hand begins to feel cold. Which claim explains what is different about the particles that make up her hand?
Answer:
what's different about the particles in her hand are that for one are a solid in contrast to the ice cream which is partially liquid.
Why do scientific experiments need to be repeated?
A. Because scientists often make mistakes
B. To ensure that the same results are achieved every time
C. They only need to be repeated if the results are questionable
D. To discourage other scientists from trying to get the same results
Answer:
B
Explanation:
this is called peer review and your results will be stronger
An expandable balloon contains 3.50 dm3 of helium at 101. kPa and 23.0oC. What volume will the balloon occupy when the pressure drops to 85.0 kPa and the temperature is 10.0oC?
Answer:
3.98dm³
Explanation:
Using combined gas law equation:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (kPa)
P2 = final pressure (kPa)
V1 = initial volume (dm³)
V2 = final volume (dm³)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the provided information in this question:
V1 = 3.5dm³
V2 = ?
P1 = 101 kPa
P2 = 85.0 kPa
T1 = 23.0°C = 23 + 273 = 296K
T2 = 10.0°C = 10 + 273 = 283K
Using P1V1/T1 = P2V2/T2
101 × 3.5/296 = 85 × V2/283
353.5/296 = 85V2/283
Cross multiply
296 × 85V2 = 353.5 × 283
25,160V2 = 100,040.5
V2 = 100,040.5 ÷ 25,160
V2 = 3.98dm³
What is the specific heat of an unknown substance if a 3.50 gram sample releases 50.21 joules of energy
as its temperature changes from 25°C to 20°C?
The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat.
Thus, The formula below, where c is the specific heat, is typically used to explain the relationship between heat and temperature change. If a phase shift occurs, the relationship is invalid because the temperature is unaffected by the heat added or lost during a phase transition.
Water has the highest specific heat of any common substance at 1 calorie/gram °C = 4.186 joule/gram °C. Water thus plays a crucial part in controlling temperature.
Water has a far higher specific heat per gram than a metal does. Most of the time, comparing the molar specific temperatures of different substances makes more sense.
Thus, The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat.
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What name is given to a metal when it forms an ion, and what type of charge does it have?
Answer:
Cation metal. Positive charge.
Answer:
DHS has been working hard for years and it is still unclear whether this would happen if it is to end the market with the engine is a little less than the next 5years to be 8years in the first quarter and the same year in a quarter or less than a quarter or more than that
Adenine has a molecular mass of 135. 1 and consist of 44. 45%c, 3. 73%h, and 52. 82%n by mass. Determine its molecular formula
The molecular formula for Adenine with molecular mass of 135.1 and consist of 44. 45% C, 3. 73% H, and 52. 82% N by mass is C₃H₃₆N₂.
The molecular formula expresses the number of atoms of each element in one chemical molecule.
The definition of a molecular formula is the formula that shows the exact number of atoms in a molecule.
The empirical formula is used to derive the Molecular Formula when the molar mass value is known.
n=empirical formula molar mass/mass
The molecular formula is frequently the same as or an exact multiple of an empirical formula.
We have molecular formula = 135.14
so we need to find each atoms contribution so,
C = 135.14 /44.45 = 3.03
H = 135.14 /3.73 = 36.21
N = 135.14 / 52.82 = 2.55
So we have molecular formula as,
C₃H₃₆N₂.
Adenine is a nucleic acid component, specifically the nitrogenous base in the structure. Adenine is a nitrogenous base present on both DNA and RNA molecules (examples of nucleic acids). Adenine is a compound of Carbon, Hydrogen, and Nitrogen atoms, and elemental analysis can assist in determining the chemical formula.
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what evidence have you discovered to explain how the structure of compounds determens the properties of the compounds
All of the properties such as ice floating on water, while most solids would sink when placed in its liquid are all due to the structure of the compounds.
The structure of the compounds includes the bonding angle, the type of bonds, the size of the molecule, the interactions between the molecules etc. Slight changes in the chemical structure and affect the properties if the compound.
Isomeric compounds with the same chemical formula but different structures can have different melting and boiling point and differ in reactivity and flammability.
Another common change in isomers are with the double bonds. A double bond can be in the cis formation or in the trans formation, and this will affect its properties as trans isomers will be having high melting point than the cis isomer.
Thus, structure of compounds do determine the properties of the compounds.
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can you help me with this
Use the reaction to answer the following question.
3 h2(g) + n2(g) + 2 nh3(g) + heat
reactants products
nh3 is added to the reaction. what effect will this have on the equilibrium
shift of the reaction?
the reaction will shift left towards the products.
the reaction will shift right towards the reactants.
the reaction will shift right towards the products.
the reaction will shift left towards the reactants.
the reaction will shift left towards the reactants.
For the value of k to remain constant, the products must react with each other and produce the reactant
Why is the answer a not d?
The correct answer is therefore A, -1.66 V.
The given information includes the standard reduction potential of the half-reaction:
Ag(aq) + e- → Ag(s) E° = +0.80 V
We can use this information along with the standard cell potential equation to find the standard reduction potential of the half-reaction:
E°cell = E°reduction + E°oxidation
where E°cell is the standard cell potential, E°reduction is the reduction potential for the half-reaction being reduced, and E°oxidation is the oxidation potential for the half-reaction being oxidized.
In this case, the two half-reactions involved are:
M3+(aq) + 3e- → M(s) (reduction)
3Ag(aq) → 3Ag+(aq) + 3e- (oxidation)
The reduction half-reaction needs to be flipped and its potential sign changed to obtain the oxidation potential:
M(s) → M3+(aq) + 3e- (oxidation)
The standard cell potential is the difference between the reduction and oxidation potentials:
E°cell = E°reduction + E°oxidation
E°cell = E°(M3+(aq) + 3e- → M(s)) + E°(M(s) → M3+(aq) + 3e-)
E°cell = E°(M(s) → M3+(aq) + 3e-) + (-E°(3Ag(aq) → 3Ag+(aq) + 3e-))
E°cell = E°(M(s) → M3+(aq) + 3e-) - E°(Ag(aq) → Ag(s))
E°cell = E°(M3+(aq) + 3e- → M(s)) - E°(Ag(aq) → Ag(s))
E°cell = -2.46 V - 0.80 V = -3.26 V
Therefore, the standard reduction potential for the half-reaction M3+(aq) + 3e- → M(s) is:
E°(M3+(aq) + 3e- → M(s)) = E°cell + E°(Ag(aq) → Ag(s))
E°(M3+(aq) + 3e- → M(s)) = -3.26 V + 0.80 V = -2.46 V
The correct answer is therefore A, -1.66 V.
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How long would it take to deposit the mass of the experimental mass gain of cathode from run 1 during the electrolysis of copper if you used a current of 2.50 a? (answer in minutes)
The mass of an element released during electrolysis is inversely proportional to the amount of electricity flowing through the electrolyte, according to the first law.
Mathematically, this can be expressed as: deposited mass, current, I, and time, t, or deposited mass, It. Where Q=Charge, M=Molarmass, n=nfac. A) M=Qm/Fn, the mass (m) of a substance deposited on the cathode or anode during electrolysis is given. Silver atoms are added to the cathode and subtracted from the anode for each element that circles the external circuit. This indicates that the mass obtained by the cathode is equal to the mass lost by the anode (assuming the silver anode is pure; see below).
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How many electrons would be in a calcium cation with a positive 2 charge?
Number of electrons in a Ca²⁺ = 18
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
The element Ca has an atomic number of 20, so the number of electrons and protons (in neutral atoms) is also 20
Electron configuration of Ca : 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² ⇒[Ar] 4s²
When Ca releases 2 electrons to gain stability (forming Ca²⁺ cations), the number of electrons becomes:
\(\tt 20-2 = 18\)
and the electron configuration (Ca²⁺ ) becomes:
1s², 2s², 2p⁶, 3s², 3p⁶