CHEMISTRY HIGH SCHOOL

Which catalyst is better for the decomposition of Hydrogen Peroxide(H₂O₂) , Potassium Iodide(KI) or Yeast? Explain why. Please help ASAP, very much appreciate it. Thankyou in advance.

Answers

Answer 1
Answer: Yeast, because it acts as a catalyst, or a helper, to remove the oxygen from the hydrogen peroxide

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Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:A. What is the limiting reagent?B. How many grams of the excess reactant remains?C. How many grams of each product is formed? D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?
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As the tempreture of a liquid increases the solubility of a liquid of that liquid

Answers

As the temperature increases, the solubility of the solute in the liquid also increases.  This is due to the fact that the increase in energy allows the liquid to more effectively break up the solute.  The additoin of energy also shifts the equilibrium of the reation to the right since it takes energy to dissolve most things and you are adding more of it (this is explained with Le Chatlier principles).

I hope this helps and also I assumed that your question involved the solubility of an ionic substance in a solvent like water.  If that was not your question feel free to say so in the comments so that I can answer your actually question.

What does newton's third law say about why momentum is conserved in collisions?A. Equal forces act in equal times, so the change in momentum for both objects must be equal.
B. Unequal forces act in unequal times, so the change in momentum for both objects must be equal.
C. Unequal forces act in unequal times, so the change in momentum for both objects must be unequal.
D. Equal forces act in unequal times, so the change in momentum for both objects must be equal.

Answers

Answer: Option (A) is the correct answer.

Explanation:

According to Newton's third law of motion, when force is exerted by one body to second body then the  second body will also exert a force equal in magnitude and opposite in direction on the first body.

For example, when we hit a wall with our leg then the wall also applies a force on our leg and thus, our leg gets hurt.

Hence, we can conclude that newton's third law says that momentum is conserved in collisions because equal forces act in equal times, so the change in momentum for both objects must be equal.
I took the test and can confirm that the answer is A.

when a log of wood burns, it undergoes a _______. a. physical change. b. chemical change. c. physical and a chemical change. d. no physical or chemical change.

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B. Chemical change is the answer!

B. chemical change because a new substance is forming with new properties.

classify each orbital diagram for ground-state electron configurations by the rule or principle it violates.

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The correct answer for the question that is being presented above is this one: see attached picture. Each orbital diagram for ground-state electron configurations by the rule or principle it violates: Aufbau violation, Hand violation, Pauli violation.

Assume that the arrangement as 1 - 5, then
Aufbau Violation = 5 & 2
Hand Violation = 3 & 4
Pauli Violation = 1
The question is incomplete:
Complete question is attached below:
.......................................................................................................................
Answer 1: 
In the first case, two electrons in the 1st 2p sub-shell has both the electrons with same electron spin. This is a violation of Pauli's exclusion principle, according to which, orbital can contain a maximum of only two electrons, the two electrons must have opposing spins.

 Answer 2: 
In the second case, 3s and 3p orbital is incompletely filled. This is a violation of Hund's rule. According to Aufbau Principle, orbitals of lower energy get filled first and than orbital of higher energy. Hence, in present case, 3s orbital must be completely filled first and then electron must 3p orbital.

Answer 3: 
In the 3rd case, the first sub-shell of 2p orbital has two electrons, while all other sub-shell is empty. This is a violation of Hund's rule, according to which all orbitals will be singly occupied before any is doubly occupied. Hence, in present case, there should be one electron present in each sub-shell of 2p orbital.

Answer 4: 
In the forth case, 4s and 4p orbital are filled first and 3d orbital is filled. This is a violation of Aufbua principle. Because, according to Aufbua principle orbital of lower energy are filled first. In present case, 3d orbital has lower energy as compared to 4s and 4p orbital. 

According to the Arrhenius Theory a base reacts with an acid to produce

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Water. Arrhenius acids provide a H+ ion and a base provides a OH- ion, which react to form water.

Which of these statement is conclusive evidence that mixing sugar in water is a physical change? A). there is no change in color B).there is no precipitate formed. C).there is no gas given off. D).there is no molecular change.

Answers

The statement is conclusive evidence that mixing sugar in water is a physical change is there is no molecular change. Therefore, option D is correct.

What is physical change ?

A change known as physical change occurs when the physical characteristics of matter change. Physical changes include those in color, odor, solubility, and the condition of matter, among others.

Melting, turning into a gas, changing strength or durability, changing crystal structure or texture, and changing shape, size, color, volume, or density are a few examples of physical qualities.

Because sugar molecules are spread throughout the water, but the individual sugar molecules remain unaltered, dissolving sugar in water represents a physical change.

Thus, option D is correct.

To learn more about the physical change, follow the link;

brainly.com/question/3680148

#SPJ2

D.) There is no molecular change



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Which of the following would most likely happen if water did not form hydrogen bonds?A) Water would exist only as a solid. B) Water would be able to dissolve all ionic compounds. C) Water would not expand when it freezes. D) Water would not exist on Earth.