Question 1

Which of the following best describes an element?

Accepted Answer

A substance that cannot be broken down into simpler substances by chemical reactions.

Question 2

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus.

Question 3

Given an atom with a mass number of 23 and an atomic number of 11, how many neutrons does it have? Use the formula $$	ext{Number of neutrons} = 	ext{Mass number} - 	ext{Atomic number}.$$

Accepted Answer

12

Question 4

Which statement about valence electrons is correct?

Accepted Answer

Valence electrons determine the chemical behavior of an atom.

Question 5

What type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 6

Which of the following is true about polar covalent bonds?

Accepted Answer

Electrons are shared unequally, resulting in regions of partial charge.

Question 7

A hydrogen bond is most likely to form between:

Accepted Answer

A hydrogen atom covalently bonded to oxygen and another electronegative atom.

Question 8

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the attraction between oppositely charged ions.

Question 9

If an atom loses an electron, what type of ion does it become?

Accepted Answer

A cation

Question 10

Which of the following is a correct statement about the first electron shell of an atom?

Accepted Answer

It can hold up to 2 electrons.

Question 11

Which of the following is true about the chemical behavior of atoms?

Accepted Answer

It is determined by the number of electrons in the valence shell.

Question 12

A sodium atom (Na) has an atomic number of 11 and a mass number of 23. How many electrons does a neutral sodium atom have?

Accepted Answer

11

Question 13

Which of the following is a product in the chemical reaction $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

$$H_2O$$

Question 14

Which property of water is primarily due to hydrogen bonding?

Accepted Answer

Its high boiling point compared to similar-sized molecules.

Question 15

What is the mass number of an atom with 6 protons, 6 neutrons, and 6 electrons?

Accepted Answer

12

Question 16

Which of the following statements about compounds is correct?

Accepted Answer

Compounds are formed by elements combining via chemical bonds.

Question 17

Which of the following is an example of an inorganic compound found in the human body?

Accepted Answer

Water

Question 18

Which of the following best explains why atoms form chemical bonds?

Accepted Answer

To achieve a full valence shell and become more stable.

Question 19

Which of the following is true about salts formed by ionic bonds?

Accepted Answer

They consist of cations and anions arranged in a crystal lattice.

Question 20

If an atom has 8 protons, 8 neutrons, and 10 electrons, what is its charge?

Accepted Answer

2-

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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