2nd Semester Test

The smaller numbers in a chemical equation are called

• Subscripts
• coefficients
• products
• reactants

The bigger numbers are called

• subscripts
• coefficients
• products
• reactants

The chemicals after the reaction arrow in the equation are the

• subscripts
• Coefficients
• Products
• Reactants

The Law of Conservation of matter states that matter can be created or destroyed

• True
• False

When you have a single reactant that breaks down to form 2 or more products, that is a ____________ reaction.

• Synthesis
• Decomposition
• single replacement
• Combustion

In balancing a chemical equation, which of the following are you allowed to do?

• change subscripts
• write coefficients
• combustion
• add new substances

Which coefficients correctly balance the formula equation below? KClO3(s) → KCl(s) + O2(g)

• 1,1,1,
• 1,1,3
• 2,2,3
• 2,1,1

The chemicals on the left side of the equation arrow are the

• subscripts
• Coefficient
• products
• reactants

What is the mass of one mole of Helium

• 4g
• 2g
• 8g
• There is no way to know

What is the molar mass of CO2

• 44g
• 32g
• 16g
• 12g