Question 1

Which of the following statements best describes an atom?

Accepted Answer

An atom is the smallest particle of an element that retains its chemical properties.

Question 2

If an atom has an atomic number of 11 and an atomic mass of 23, how many neutrons does it have?

Accepted Answer

$$23 - 11 = 12$$ neutrons

Question 3

Which of the following is true about ions?

Accepted Answer

Ions are formed when the number of electrons in an atom changes.

Question 4

A sodium ion (Na$$^+) $$has 11 protons. How many electrons does it have?

Accepted Answer

10 electrons

Question 5

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen has a stronger pull on electrons than hydrogen, creating an uneven distribution of charge.

Question 6

Which type of bond is responsible for holding water molecules together?

Accepted Answer

Hydrogen bonds

Question 7

What is the maximum number of electrons that can be held in the second energy level of an atom?

Accepted Answer

8 electrons

Question 8

Which of the following is a correct electron configuration for an atom with 10 electrons?

Accepted Answer

2 electrons in the first level, 8 electrons in the second level

Question 9

Which of the following is NOT a property of water due to its high polarity?

Accepted Answer

Water has a low specific heat capacity.

Question 10

A solution has a pH of 3.0. Which of the following statements is true?

Accepted Answer

The solution is acidic.

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 12

Which of the following is an example of a compound?

Accepted Answer

NaCl

Question 13

What is the atomic number of carbon, and what does it represent?

Accepted Answer

6; the number of protons in carbon

Question 14

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 15

Which of the following best describes the role of water in living organisms?

Accepted Answer

Water provides a place for chemical reactions to occur and makes up a large portion of living organisms.

Question 16

Which of the following is true about the pH scale?

Accepted Answer

A pH of 7 indicates a neutral solution.

Question 17

Which of the following chemical equations correctly represents photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 18

Which of the following best explains why water has a high specific heat capacity?

Accepted Answer

Water molecules form many hydrogen bonds, which require more energy to break.

Question 19

Which of the following is a correct statement about the arrangement of electrons in energy levels?

Accepted Answer

All energy levels being used must be filled for an atom to be stable.

Question 20

Which of the following is a real-life example of evaporative cooling due to water's properties?

Accepted Answer

Sweating during exercise

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Study Guide - Practice Questions