Question 1

Which subatomic particle is responsible for the identity of an element and is found inside the nucleus?

Accepted Answer

Proton

Question 2

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

Accepted Answer

12

Question 3

Which of the following best describes an ion?

Accepted Answer

A particle with a different number of protons than electrons

Question 4

What type of bond is formed when two atoms share electrons unequally, resulting in partial charges?

Accepted Answer

Polar covalent bond

Question 5

Water ($$H_2O) is $$considered a polar molecule because:

Accepted Answer

Oxygen attracts electrons more strongly than hydrogen

Question 6

Which property of water allows it to absorb large amounts of heat before changing temperature?

Accepted Answer

High specific heat capacity

Question 7

A solution is made by dissolving 5 g of salt in 100 mL of water. In this solution, water acts as the:

Accepted Answer

Solvent

Question 8

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 9

If an atom has 8 electrons, how are they distributed in its energy levels?

Accepted Answer

2 in the first level, 6 in the second level

Question 10

Which of the following is a real-world example of a compound formed by ionic bonding?

Accepted Answer

Sodium chloride ($$NaCl)$$

Question 11

What is the pH of pure water, and what does this indicate about the concentrations of $$H^+$$ and $$OH^-$$ ions?

Accepted Answer

pH 7; equal concentrations of $$H^+$$ and $$OH^-$$

Question 12

Which property of water is responsible for the formation of a meniscus in a graduated cylinder?

Accepted Answer

Adhesion

Question 13

A chemical equation is balanced when:

Accepted Answer

The number of atoms of each element is the same on both sides of the equation

Question 14

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water's high polarity allows it to surround and separate ions

Question 15

What is the total number of oxygen atoms in the reactants of the following equation? $$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Accepted Answer

12

Question 16

Which of the following is NOT a property of water that is important for life?

Accepted Answer

Low polarity

Question 17

A molecule of $$O_2 is $$held together by which type of bond?

Accepted Answer

Nonpolar covalent bond

Question 18

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom and a highly electronegative atom

Question 19

If a solution has a pH of 3, which of the following statements is true?

Accepted Answer

It is acidic

Question 20

Which element is most abundant in the mass of a human being?

Accepted Answer

Oxygen

Basic Chemistry Concepts for General Chemistry

Study Guide - Practice Questions