Chemical Reactions Post Test

What is a shorthand notation that represents a compound or molecule called?

• Chemical Equation
• Chemical Formula
• Chemical Reaction
• Chemical

According to the law of conservation of mass...

• sometimes atoms are lost
• sometimes atoms are gained
• atoms are never lost nor gained
• atoms are lost and gained

What do we call a substance that increases the rate of a reaction without participating in the reaction?

• catalyst
• inhibitor
• accelerator
• decelerator

What do we call a substance that slows down the rate of a chemical reaction?

• catalyst
• inhibitor
• accelerator
• decelerator

In an exothermic reaction energy is ...

• released
• absorbed
• protons
• electrons

In an endothermic reaction energy is...

• released
• absorbed
• protons
• neutrons

Which of the following will increase the rate of a reaction?

• raising the temperature of reactants
• grinding the reactants into a powder
• increasing the concentration of reactants
• all of the above

Is this equation balanced?

• yes
• no
• Not enough information

Is this equation balanced?

• yes
• no
• Not enough information

How many hydrogen atoms are reacting?

• 2
• 4
• 8
• 1