Chemical Reactions + Atomic Structure

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

Which of the following is an example of a chemical change?

• water freezes to form ice

• sugar dissolves in water

• gasoline burns in a car engine

• a piece of metal expands when it is heated

A change in the shape of an object is an example of _________________.

• a chemical change

• energy

• an endothermic change

• a physical change

Which of the following is an example of a chemical change?

• rusting of a bicycle
• painting a house
• washing a dog
• tearing up a newspaper

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

• Physical
• Chemical

What is the BEST definition of a chemical reaction?

• A change in matter that produces one or more NEW substances

• When two things combine and EXPLODE.

According to the law of conservation of mass, matter cannot be created or (a)  

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

• True

• False

How many Carbons are present on the reactant side?

• 1

• 2

• 3

• 4

How many Hydrogens are on the product side of this chemical equation?

• 1

• 2

• 3

• 4