Chemical Reactions

When vinegar and baking soda are combined, bubbles begin to form. The formation of bubbles is evidence that what kind of chemical reaction occurred?

• Production of light

• Production of gas

• Color change

• Formation of a precipitate

All are examples of physical properties except for the following.

• Color

• Odor

• Melting point

• Flammability

Burning paper is an example of what kind of change?

• Physical change

• Chemical change

Which of the following is the best description of the results of a chemical reaction?

• A new substance with different properties is formed.

• The substance seems to disappear after dissolving in water.

• The substance changes from liquid to solid at a low temperature.

• The reaction can be reversed to get back the original substance.

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

• Product

• Reactant

• Starters

• Enders

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

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
• nuclear change
• physical change
• mutation

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change