Chemical reactions

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 one shows that a chemical reaction has occurred?

• dissolving

• melting

• formation of a gas

• bending

What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change

• physical change

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

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.

What does the Law of Conservation of Mass state?

• Matter CANNOT be created or destroyed in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter CAN be created and destroyed in a chemical reaction.

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation