Quiz: Chemical Reactions 2023

How many different ELEMENTS are represented in the compound Na₂CO₃?

• 1

• 2

• 3

• 4

• 6

How many Carbon (C) atoms are in 4Na₂CO₃?

• 1

• 3

• 4

• 8

• 12

Hydrogen peroxide has a chemical formula of H₂O₂. Hydrogen peroxide is a...

• Compound

• Element

• Mixture

The smallest piece of a compound is a...

• molecule

• atom

• element

• nucleus

Which answer could be represented by this model of ozone?

• 3 O

• O₃

How many molecules of hydrogen peroxide are here: 8H₂O₂?

• 4

• 8

• 12

• 16

• 32

Calcium nitrate is a compound that makes fireworks orange. How many nitrogen atoms are in its formula?

Ca(NO₃)₂

• 1

• 2

• 3

• 4

• 6

In the equation below, what are the products?

2H₂ + O₂ → 2H₂O

• 2H₂O

• 2H₂ + O₂

Select ALL of the reactant(s) of the chemical reaction of photosynthesis.

• carbon dioxide

• water

• sugar

• oxygen

• sunlight

Check ALL of the evidence that could indicate a chemical reaction is occurring.

• temperature change

• gas produced

• melting

• new substance formed

• odor