2Al(OH)3 + 3H₂ →2AI + 6H₂O , 2 moles of Al(OH)3 give ,3 moles of H₂O. so, 100gm of Al(OH)3 gives 300 gm of H₂O.
What causes an endothermic reaction?Endothermic chemical processes are those that generally absorb (or use) energy. When bonds in the reactants are broken in endothermic reactions, more energy is absorbed than is released when new bonds are created in the products.
What does the an in n a stand for?Not applicable, (also known as N/A), is a written acronym for not applicable that is used on forms when you are unable to provide a relevant (i.e., answer the question) response. Related words and phrases are part of the SMART Vocabulary. undesirable and inappropriate. amiss.
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In general, how many valence electrons do transition metals have? (Valence are highest n, only s and p sublevel)
What ion is likely to form with transition metals? Speculate as to why you think some transition metals can form multiple ions?
Answer:
2 valence electrons.
Explanation:
Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is
n
s
2
(
n
−
1
)
d
, so those
n
s
2
electrons are the valence electrons
In what order are redox reactions balanced?
Answer:
B
Explanation:
Answer:
b
Explanation:
a p e x :)
Which of these is an example of how engineers have contributed to society?
A. Our current understanding of viruses
B. Nomadic tribes traveling in search of food to hunt and gather
C. The theoretical mathematics describing the orbits of planets
around the sun
D. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
An example of how engineers have contributed to society is option D. The seven-mile bridge that spans across the Gulf of Mexico to connect two cities of the Florida Keys.
It is an example of how engineers have contributed to society. Engineers played a crucial role in designing, planning, and constructing the bridge, which provides an essential transportation link between the two cities.
The bridge enables efficient and safe travel, connecting communities, promoting economic development, and improving accessibility for residents and visitors. Engineering expertise is necessary to address various challenges such as designing a structure capable of withstanding environmental conditions, ensuring structural integrity, and incorporating appropriate safety measures.
This example showcases how engineers contribute to society by creating infrastructure that enhances connectivity and supports the growth and well-being of communities. The correct answer is option d.
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at 1 atm pressure the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. how much heat is required to melt 0.500 mol of gallium at 1.00 atm pressure?
At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
The data given as follows :
The heat of sublimation of gallium = 277 kJ/mol
The heat of vaporization = 271 kJ/mol
The difference between the heat of sublimation of gallium and the heat of vaporization is given as :
ΔH = heat of sublimation - heat of vaporization
ΔH = 277 kJ/mol - 271 kJ/mol
ΔH = 6 kJ/mol
The heat required = n ΔH
= 0.500 × 6
= 3 kJ
Thus, At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
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a restriction enzyme recognizes the sequence 5ʹ-gtcatgac-3ʹ and makes staggered cuts. which statement is most likely to be true?
The most likely true statement about a restriction enzyme recognizing the sequence 5ʹ-gtcatgac-3ʹ and making staggered cuts is: "The restriction enzyme produces fragments with sticky ends".
When a restriction enzyme recognizes a specific DNA sequence, it cuts the DNA at or near that sequence. Staggered cuts refer to cuts made at different positions on the two DNA strands, resulting in fragments with overhanging ends. These overhanging ends are often referred to as sticky ends because they can base pair with complementary sequences.
In the given sequence 5ʹ-gtcatgac-3ʹ, the restriction enzyme would recognize and cut between the G and the T bases, resulting in staggered cuts. This would produce fragments with complementary overhangs: 5ʹ-GTCATG-3ʹ and 5ʹ-GTCA-3ʹ. These overhanging ends can then bind or anneal with complementary sequences during DNA manipulation, such as in cloning or DNA ligation reactions.
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give me the type of reactions ___ CuCO3 → ___ CuO + ___ CO2
: 2NaOH + H,S0A - Na,SO A + 2H,0 How many moles of sodium sulfate (Na,SO,) reproduced when 5.0 moles of sodium hydroxide (Na0H) are reacted with excess sulfuric acid? A 2.5 moles B 1.0 moles C 5.0 moles D 2.0 moles
From the reaction, we can see that the number of moles produced is 2.5 moles of Na2SO4
What is a reaction?Chemical reaction involves the combination between two or more species. In this case, the reaction equation is; 2NaOH + H2S04 ----> Na2SO4 + 2H20.
Now we are told that sulfuric acid is in excess hence NaOH is the limiting reactant.
If 2 moles of NaOH produces 1 mole of Na2SO4
5 moles of NaOH produces 5 moles * 1 mole/ 2 moles
= 2.5 moles of Na2SO4
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How can the crystal field splitting parameter Δoct be related to the wavelength of light absorbed in a transition metal complex?
Δoct represents the energy difference between the lower-energy d-orbitals (t2g) and the higher-energy d-orbitals (eg) in an octahedral complex.
The crystal field splitting parameter Δoct is related to the wavelength of light absorbed in a transition metal complex through the phenomenon of crystal field theory. In transition metal complexes, the metal ion is surrounded by a group of ligands that generate a crystal field, which causes the d-orbitals of the metal to split into two sets of orbitals. The energy difference between these two sets is represented by Δoct. When light is absorbed by a transition metal complex, an electron in one of the lower energy d-orbitals is excited to a higher energy d-orbital. The energy of the absorbed light corresponds to the energy difference between the two sets of d-orbitals, which is proportional toΔoct Therefore, the wavelength of light absorbed in a transition metal complex is directly related to the value of Δoct. As Δoct increases, the energy difference between the d-orbitals increases, and the absorbed wavelength shifts to the higher energy (shorter wavelength) end of the spectrum.
By using the equation λ = (hc) / Δoct, you can relate the crystal field splitting parameter (Δoct) to the wavelength of light absorbed in a transition metal complex.
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Ammonia (A) diffuses through a stagnant layer of air (B), 1cm thick, at 25 ºC and 1 atm total pressure. The partial pressures of ammonia on the two sides of the air layer are: PA0=0.9 atm and PAl=0.1 atm respectively. Air is none diffusing. Calculate the molar flux of ammonia. DAB= 0.214 cm2 /s
Answer:
The value \(N_A = 0.192 \ mol \cdot m^{-2} \cdot \ s\)
Explanation:
From the question we are told that
The thickness of the air is \(z_2 - z_1 = 1 \ cm =0.01 \ m\)
The temperature is \(T = 25^oc = 25 +273 = 298 \ K\)
The total pressure is \(P_T = 1 atm = 1.01325*10^{5} \ Pa\)
The partial pressure of Ammonia first side is \(P_{AO} = 0.9 \ atm = 0.9 * 1.01325*10^{5} = 91192.5 \ Pa\)
The partial pressure of Ammonia to the second side is \(P_{A} = 0.1 \ atm = 0.1 * 1.0325*10^{5} = 10132.5 \ Pa\)
Rate of flow of ammonia is
\(D_{AB} = 0.214 \ cm/s = \frac{0.214 }{10000} = 2.14 *10^{-5} \ m^2 /s\)
Generally the molar flux of ammonia is mathematically represented as
\(N_A = \frac{D_{AB} * P_T }{RT(z_2 -z_1)} * ln [\frac{P_T - P_{Al}}{P_T - P_{AO}} ]\)
Here R is the gas constant with value
\(R = 8.314 \ m^3 \cdot Pa \cdot mol^{-1} \cdot K\)
\(N_A = \frac{2.14 *10^{-5} * 1.01325*10^{5} }{8.314 *298 (0.01)} * ln [\frac{1 - 0.1}{1 - 0.9} ]\)
=> \(N_A = 0.192 \ mol \cdot m^{-2} \cdot \ s\)
The melting point of this substance is __________________.
Put a number in the answer.
The melting point of the substance is 12.5 degrees Celsius
What is melting pointMelting point is the temperature at which a solid substance changes state from solid to liquid at atmospheric pressure.
At the melting point, the solid and liquid phases of the substance exist in equilibrium, and any further increase in temperature will cause the substance to completely melt into a liquid.
The melting point is a characteristic physical property of a substance and can be used to identify and purify a substance. The melting point of a substance is usually reported in degrees Celsius (°C) or Kelvin (K).
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please someone help !!!!
Answer:
mass, space, composition, changes, 5, carbon, carbon, organisms, analytical chemistry, physical chemistry, energy transfer, two
Explanation:
a compound containing xenon and fluorine was prepared by shining sunlight on a mixture of xe (0.618 g) and excess f2 gas. if you isolate 1.334 g of the new compound, what is its empirical formula? enter as xef, e.g. xef3
The empirical formula of the new compound is XeF2. This can be determined by calculating the number of moles of each element present in the compound.
The number of moles of Xe present is 0.618/131.293 = 0.0047 moles and the number of moles of F2 present is 1.334/37.997 = 0.035 moles.
Since the ratio of the number of moles of Xe to the number of moles of F2 is 0.0047/0.035 = 0.134, the empirical formula for the compound is XeF2.
The empirical formula is the simplest ratio of atoms in a compound that can represent its composition. It is derived by dividing the number of atoms of each element in a compound by the smallest number of atoms among them.
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oxygen concentration in the air is considered deficient if it drops below
The oxygen concentration in the air is considered deficient if it drops below 19.5%.
To understand why oxygen concentration is important, we must first recognize that oxygen is vital for sustaining human life.
The air we breathe typically contains about 21% oxygen, which is the optimal level for our respiratory system to function efficiently.
However, if the oxygen concentration drops below 19.5%, it can have adverse effects on our health.
When the oxygen level in the air is deficient, it can lead to hypoxia, a condition characterized by oxygen deprivation in the body's tissues.
This can cause symptoms such as shortness of breath, rapid breathing, dizziness, confusion, and even loss of consciousness in severe cases.
Prolonged exposure to low oxygen levels can have serious consequences, including organ damage and even death.
Several factors can contribute to a decrease in oxygen concentration in the air.
These include high altitudes where the air is naturally thinner, poorly ventilated spaces, pollution, and certain medical conditions that affect the body's ability to absorb or transport oxygen effectively.
To ensure a sufficient oxygen supply, it is crucial to monitor indoor air quality, especially in enclosed spaces.
Adequate ventilation and circulation of fresh air can help maintain optimal oxygen levels.
In situations where oxygen concentration drops significantly, supplemental oxygen therapy may be necessary to support individuals with respiratory difficulties.
In conclusion, oxygen concentration in the air is considered deficient if it falls below 19.5%. Sustaining adequate oxygen levels is essential for our overall well-being and health.
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Which of the following is the CORRECT FORMULA for an element from GROUP 2
bonded to an element from GROUP 16 (6A)?
A. MgS2
B. Ca2S6
C. BeO
D. Sr2S2
Calculate the volume of 1. 5x10^-2 naoh that must be added to 500ml og 0. 2m hcl to give a solution that has a ph of 2. 15
The volume of 1.5 × 10^(-2) M NaOH that must be added to 500 mL of 0.2 M HCl to give a solution that has a pH of 2.15 is 6.67 mL.
To solve this problem, we first need to write the balanced chemical equation for the reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl), which is
NaOH + HCl → NaCl + H2O.
We are given the initial concentration of HCl as 0.2 M. We then use the pH value, which is 2.15, and the relationship between pH and the concentration of hydrogen ions ([H+]) to calculate the concentration of [H+] in the final solution.
Using the equation pH = -log[H+] and [H+] = 10^(-pH),
pH = -log[H+]
[H+] = 10^(-pH)
[H+] = 10^(-2.15) = 7.08 × 10^(-3) M
we find that [H+] = 7.08 × 10^(-3) M.
Next, we need to determine the mole ratio of NaOH to HCl, which we can find from the balanced chemical equation as 1:1. We then calculate the amount of NaOH required to react with all of the HCl in the initial solution, which is 0.1 moles.
moles of HCl = concentration × volume = 0.2 M × 0.5 L = 0.1 moles
moles of NaOH = 0.1 moles
Finally, we need to calculate the volume of 1.5 × 10^(-2) M NaOH required to provide 0.1 moles of NaOH.
moles of NaOH = concentration × volume
volume = moles of NaOH / concentration
volume = 0.1 moles / 1.5 × 10^(-2) M = 6.67 L
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Science
How would the pressure of the gas in an air tank change if more gas particles are added?
150 words
Answer:
LOL ked e e. E e s e
Explanation:
This is my account
Identify the correct same regarding the strength of chemical bonds
A. Strong bonds require less energy in the form than weak bonds
B.Weak bonds require less energy to Form bonds than strong bonds
C. Strong bonds occur with high temperature and weak bonds with low temperature
D. Weak bonds require more key to formed and strong bonds
Answer:
weak bonds require less energy to form bonds than strong bonds
when a stable diatomic molecule spontaneously forms from its atoms at constant pressure and temperatureT/F
When a stable diatomic molecule spontaneously forms from its atoms at constant pressure and temperature, the statement is true.
When two atoms form a diatomic molecule, a chemical bond is created, and energy is released. This energy is typically in the form of heat or light, and the process is exothermic. Since the diatomic molecule has lower free energy than the individual atoms, the change in Gibbs free energy (ΔG) is negative, and the reaction occurs spontaneously at constant pressure and temperature.
Therefore, the answer is true.
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When does boiling occur?
Water boils at 100 Degrees Celsius or 212 degrees Fahrenheit
a 1) How would you make 1 liter of a 10% NaCl solution from a solid stock? Provide details of what kind of containers you would use.
To make 1 liter of a 10% NaCl solution from a solid stock, you will require the following materials and containers.MaterialsSolid NaClDistilled water1-Liter volumetric flask250-mL volumetric flask 2-beakersProcedureTo prepare 1 liter of a 10% NaCl solution, the following procedure should be followed:Measure out 100g of NaCl using a balance.
Measure the weight of an empty 250-mL volumetric flask.Add the NaCl to a 250-mL beaker and add a small amount of distilled water to it to dissolve the NaCl.Carefully pour the dissolved NaCl solution into the 250-mL volumetric flask. Add distilled water to the mark on the flask to make up the volume. Stopper the flask and invert it several times to mix the solution.Measure the weight of the 1-Liter volumetric flask.Add the 250-mL volumetric flask solution to a 1-Liter volumetric flask.Add distilled water to the mark on the flask to make up the volume.
Stopper the flask and invert it several times to mix the solution.The final volume of the solution will be 1 liter of a 10% NaCl solution.PrecautionsEnsure the NaCl has completely dissolved before adding more water to avoid making a less concentrated solution.Measure the weight of the volumetric flask before and after adding the solution to calculate the volume of solution that was added.Use distilled water to prepare the solution.
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ANSWER ASAP
1. NH₄NO₂(s) → N₂(g) + H₂O(l)
1a. Write the number (if any) that should go in front of NH₄NO₂(s), N₂(g), and H₂O(l) in order with commas in between. If there shouldn't be a number, write "no number".
1b. What type of reaction is represented in this equation?
2. Cl₂(g) + KBr(aq) → KCl (aq) + Br₂(l)
2a. Write the number (if any) that should go in front of each compound in order with commas in between. If there shouldn't be a number, write "no number".
2b. What type of reaction is represented in this equation?
3. FeS(s) + HCl(aq) → H₂S(g) + FeCl₂ (aq)
3a. Write the number (if any) that should go in front of each compound in order with commas in between. If there shouldn't be a number, write "no number".
3b. What type of reaction is represented in this equation?
Answer:
Ok:
Explanation:
1a: \((no number) NH_4NO_2_{(s)} => (no number) N_2_{(g)} + 2 H_2O_{(l)}\)
1b: Decomposition reaction
2a. \((no number) Cl_2_{(g)} + 2 KBr_{(aq)} => 2 KCl_{(aq)} + (no number) Br_2_{(l)}\)
2b Single replacement reaction
3a. \((no number)F_2S_{(s)} + 2HCl_{(aq)} =>(no number)H_2S{(g)} + (nonumber)FeCl_2_{(aq)}\)
3b. Double replacement reaction
CaO +
HCI →
CaCl2 +
H20
Explanation:
To balance this chemical equation-
see
Balanced form:-
CaO + 2 HCl ==. CaCl2 + H2O
.
How many moles of carbon dioxide molecules
are there in 50g of carbon dioxide?
Answer:
3.011×1023 individual carbon dioxide molecules
A company desires to produce nickel from refining nickel oxide and sulfide ores. The first step of the process will produce a nickel carbonyl gas, Ni(CO)4, by heating the ore. The second step is as follows: Ni(CO)4(g) Ni(s) + 4CO(g) What effect on the process would be caused by increasing pressure? Ni would be produced at a higher rate. Ni would be produced at a lower rate. There would be no effect on this particular reaction.
Increasing the pressure in the system would favor the forward reaction in the equilibrium, which is the production of Ni and CO gas.
According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will shift to the direction that reduces the effect of the change.
In this case, increasing the pressure would cause the system to shift towards the side with fewer moles of gas, which is the side with solid Ni and CO gas.
Therefore, increasing the pressure would result in a higher rate of nickel production, as more Ni(CO)4 would be converted to Ni and CO gas. However, it is important to note that increasing the pressure beyond a certain point may not result in any significant changes in the rate of the reaction, as the equilibrium constant for this reaction may be reached at high pressures.
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potassium solid and aqueous zinc chloride react to produce what?
K (s) + ZnCl (aq) ====》 KCl ( aq) + Zn (s)
How long does it take the Earth to move from Point A to Point C?
Answer:
the answer should be six months
For this section, you must write a laboratory report to confirm Newton’s Second Law. Use the simulation to conduct your experiment and gather data for this section. I need help.
To confirm Newton’s Second Law using a laboratory report, you will need to conduct an experiment using a simulation and gather data. Newton’s Second Law states that force equals mass times acceleration.
Here's how you can write a laboratory report to confirm Newton’s Second Law using the simulation and gathered data. Introduction: This section should include a brief explanation of the theory behind Newton’s Second Law and what you will be testing in your experiment. It should also include your hypothesis.
Procedure: This section should explain the steps you took to conduct your experiment. In this case, it would involve using the simulation to apply different forces to objects with different masses and measuring their acceleration.
Data: This section should present the data you collected during your experiment. It can be presented in tables or graphs, and should include measurements of force, mass, and acceleration for each trial.
Analysis: This section should analyze the data you collected to determine if it supports your hypothesis and confirms Newton’s Second Law.
Conclusion: This section should summarize your findings and draw conclusions based on the data you collected. It should also discuss any errors or limitations of the experiment and suggest areas for further research.
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Why is force and Velocity different??
Answer:
Force and velocity are connected concepts -- one acts on the other. Force is a measure of power. It makes things happen. Velocity, on the other hand, is a quality an object has.
Answer:
force is a push or pull on an object, velocity is how fast an object is moving
Is more or less heat needed to raise the temperature of 30 grams of gold from 25°C to 50°C compared to the 10 grams of water?
Answer:55*
Explanation:55*
What is the elixir of life
Answer:
The elixir of life, also known as elixir of immortality and sometimes equated with the name philosopher's stone, is a potion that supposedly grants the drinker eternal life and/or eternal youth. This elixir was also said to cure all diseases.