Question 1

Which subatomic particle is responsible for the chemical properties and reactivity of an atom?

Accepted Answer

Electron

Question 2

Given the atomic number ($$Z) $$and atomic mass ($$A) of $$carbon as $$Z = 6$$ and $$A = 12$$, how many neutrons does the most common isotope of carbon have?

Accepted Answer

6

Question 3

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 4

If an atom has 11 protons, 12 neutrons, and 10 electrons, what is its net charge?

Accepted Answer

+1

Question 5

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

Accepted Answer

Covalent bond

Question 6

What is the maximum number of electrons that can occupy a single orbital?

Accepted Answer

Two

Question 7

Which of the following statements about energy levels in atoms is correct?

Accepted Answer

Electrons farther from the nucleus have higher energy

Question 8

A sodium atom ($$Na) $$loses one electron to become a sodium ion ($$Na^+). $$What type of bond will it most likely form with a chlorine ion ($$Cl^-$$)?

Accepted Answer

Ionic bond

Question 9

Which of the following best explains why water molecules are able to form hydrogen bonds?

Accepted Answer

Water molecules are polar, with partial positive and negative charges

Question 10

If an atom has an atomic number of 8 and a mass number of 18, how many neutrons does it have?

Accepted Answer

10

Question 11

Which of the following is true about the octet rule?

Accepted Answer

Atoms are most stable when their outermost shell contains 8 electrons

Question 12

Which of the following elements is most likely to form a nonpolar covalent bond?

Accepted Answer

Between two identical hydrogen atoms ($$H_2)$$

Question 13

What is the summed mass of protons and neutrons in an atom called?

Accepted Answer

Atomic mass

Question 14

Which of the following best describes a molecule?

Accepted Answer

A group of atoms held together by energy in a stable association

Question 15

Which of the following is a real-world example of an ionic bond?

Accepted Answer

The bond between sodium and chlorine in table salt ($$NaCl)$$

Question 16

Which of the following is NOT a subatomic particle found in atoms?

Accepted Answer

Ion

Question 17

Which of the following statements about orbitals is correct?

Accepted Answer

Each orbital can contain up to two electrons

Question 18

Which of the following best explains why elements are organized in the periodic table?

Accepted Answer

Based on their atomic number

Question 19

Which of the following is a consequence of differences in electronegativity between atoms in a molecule?

Accepted Answer

Formation of polar covalent bonds

Question 20

A nitrogen molecule ($$N_2) $$contains a triple covalent bond. How many electrons are shared between the two nitrogen atoms?

Accepted Answer

6

Chemistry Foundations and Structure of the Cell: Study Notes for General Biology

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