CHEMISTRY HIGH SCHOOL

An unstable nucleus loses the most mass if the nucleus emits(1) an alpha particle (3) a positron
(2) a beta particle (4) a gamma ray

Answers

Answer 1
Answer: 1. an alpha particle

gamma rays are formally massless, positrons and electrons (beta particles) have negligible mass, but alpha particles have about 4 amu of mass

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What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass =26 grams/mole)?(1) 1.3 M (3) 3.0 M
(2) 2.0 M (4) 0.75 M

Answers

The answer is (1) 1.3 M. The first thing you need to do is to convert the unit of gram to mole. The mol number of LiF is 52/26=2 mol. Then using the volume to calculate the molarity: molarity=2/1.5=1.3 M.

Which of the following metal atoms would have the highest conductivity?A.the atom with the smallest radius and the fewest valence electrons
B.the atom with the smallest radius and the most valence electrons
C.the atom with the largest radius and the fewest valence electrons
D.the atom with the largest radius and the most valence electrons

Answers

Answer: Option (d) is the correct answer.

Explanation:

A metal which has the largest size and the most valence electrons would have the highest conductivity because the larger is the size of a metal the more freely electrons can move in it. Hence, the metal can conduct electricity.

If the atom is smaller in size then the electrons will be tightly held around the nucleus and hence they won't be able to move freely. Therefore, they will not conduct electricity.

Thus, we can conclude that the atom with the largest radius and the most valence electrons would have the highest conductivity.

Answer:

D. the atom with the largest radius and the most valence electrons

Explanation:

Explain the term "amphoteric"

Answers

A substance either an ion or a molecule that can act either an acid or a base depending on a medium is called Amphoteric. Some metals like zinc, tin, copper and aluminium which produce either metal oxides or hydroxides are examples of amphoteric. During the Amphoterism, the metal compound acts either an acid or a base depending on their oxidation state.

Which of the following is not a physical change? Melting ice

Breaking glass

Filtering a mixture

Burning paper

Answers

When you burn paper you are chemically altering it so that is the correct answer. When you do all the other choices all of the components stay the same. Just because it changes shapes doesn't mean it'll change chemically toom

What kind of organic compound is oxybenzone?

Answers

aromatic ketones (benzophenones derivative)

What is the pH of a Koh solution that has [H+]=1.87×10^-13M

Answers

Answer:

12.7

Explanation:

Answer:

12.7 not 12.73

Explanation:

I did the assignment

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