Unit 2 Test Review

A series of numbers and letters that are used to represent a molecule

• chemical formula

• physical property

• chemical property

• atom

How many Al atoms are in this compound, Al₂O₃?

• 3

• 2

• 4

• 1

The small number to the right of an elemental symbol (H₂) is called?

• variable

• subscript

• coefficient

• divisor

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 24

• 12

• 6

• 3

Which is the correct formula for: 3 hydrogen (H) 1 sulfur (S) 4 oxygen (O)?

• H₄S₃O

• H₃SO₄

• HSO₄

• H₂O

The substances at the beginning of a chemical equation are called the _________________.

• chemical symbols

• products

• yields

• reactants

How many atoms of sulfur are in each molecule of H₂SO₄?

• 7

• 1

• 2

• 4

The large number written in front of the chemical formula, such as the 4 in 4 H₂O? It shows the number of molecules.

• divisor

• coefficient

• variable

• subscript?

In a ___________change, a substance changes into a different substance.

• physical

• chemical

• reactive

• symbolic

Which of the following represents a chemical reaction?

• a cake baking in an oven

• a sugar cube dissolving in water

• ice cubes forming in a freezer

• i