Question 1

Which of the following best explains what determines the properties of a chemical compound?

Accepted Answer

The types of atoms present and how they are bonded together.

Question 2

What is the sole identifier of an element according to atomic theory?

Accepted Answer

The number of protons in the nucleus.

Question 3

Which statement about compounds and molecules is correct?

Accepted Answer

All compounds are molecules.

Question 4

Essential elements make up about what percentage of the human body?

Accepted Answer

96%

Question 5

Which of the following is true about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 6

If a carbon atom has 6 protons and 8 neutrons, what is its atomic mass?

Accepted Answer

$$14$$

Question 7

Why do electrons not significantly contribute to the atomic mass of an element?

Accepted Answer

Electrons are much smaller in mass compared to protons and neutrons.

Question 8

Which of the following best describes a molecule?

Accepted Answer

A group of two or more atoms bonded together.

Question 9

A radioactive isotope decays spontaneously. What does it emit during this process?

Accepted Answer

Particles and energy.

Question 10

Which of the following is a trace element required in less than 0.01% of the human body?

Accepted Answer

Iron (Fe)

Question 11

If an atom has 11 protons, 12 neutrons, and 11 electrons, what is its atomic number and atomic mass?

Accepted Answer

Atomic number: $$11$$, Atomic mass: $$23$$

Question 12

Which subatomic particle determines the chemical identity of an atom?

Accepted Answer

Proton

Question 13

What is the main difference between a compound and a molecule?

Accepted Answer

A compound is made of two or more different elements, while a molecule is made of two or more atoms (which may be the same or different).

Question 14

Which of the following statements about atomic structure is correct?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit outside.

Question 15

If an atom normally has equal numbers of protons and electrons, what is its net charge?

Accepted Answer

Zero

Question 16

Which of the following best describes the role of electron distribution in atoms?

Accepted Answer

It determines the atom's ability to form chemical bonds.

Question 17

Carbon-14 is an isotope of carbon. How many protons and neutrons does it have?

Accepted Answer

6 protons and 8 neutrons

Question 18

Which of the following is NOT true about radioactive isotopes?

Accepted Answer

All isotopes are radioactive.

Question 19

Which property is most directly affected by the way atoms are bonded in a compound?

Accepted Answer

The compound's chemical behavior.

Question 20

Which of the following is the correct formula for calculating atomic mass?

Accepted Answer

$$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Ch. 1 Atomic Structure and Chemical Properties: Foundations of General Biology

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