Chemistry Final Review Guide 2025

A subscript is:

• a number or symbol written below and to the right of another character

• a number or symbol written above another character

• a type of mathematical operation

• a punctuation mark

How many atoms of carbon are present in a molecule of carbon tetrafluoride?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which of the following lists contains all seven diatomic molecules?

• H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

• H₂, O₂, CO₂, N₂, F₂, Cl₂, Br₂

• H₂, O₂, N₂, F₂, Cl₂, Br₂, He

• H₂, O₂, N₂, F₂, Cl₂, Br₂, Ne

Write the name or formula for: Barium chloride

• BaCl2

• BaSO4

• BaCO3

• Ba(NO3)2

4c. Write the name or formula for: Cl2O7

• Dichlorine heptoxide

• Dichlorine pentoxide

• Chlorine dioxide

• Chlorine heptachloride

Write the name or formula for: NaCl

• Sodium chloride

• Potassium chloride

• Sodium carbonate

• Calcium chloride

Identify the following symbol: a. → b. + c. (s) d. (g) e. (l) f. (aq)

• a. yields or produces b. plus c. solid d. gas e. liquid f. aqueous (dissolved in water)

• a. is equal to b. minus c. vapor d. plasma e. solution f. precipitate

• a. reacts with b. divided by c. energy d. heat e. base f. salt

• a. forms b. times c. acid d. water e. metal f. nonmetal

A coefficient in a chemical formula indicates the number of molecules, while a subscript indicates the number of atoms of an element in a molecule. Which statement correctly describes the difference between a coefficient and a subscript?

• A coefficient shows the number of molecules; a subscript shows the number of atoms in a molecule.

• A coefficient shows the number of atoms in a molecule; a subscript shows the number of molecules.

• Both coefficient and subscript show the number of molecules.

• Both coefficient and subscript show the number of atoms in a molecule.

To balance a chemical equation, it may be necessary to adjust:

• the subscripts in the formulas

• the coefficients in the equation

• the chemical symbols

• the state symbols

According to the law of conservation of mass, the total mass of reacting substances is:

• equal to the total mass of the products

• greater than the total mass of the products

• less than the total mass of the products

• unrelated to the total mass of the products

Tags

NGSS.HS-PS1-7