Chemistry Unit Quiz

Which type of reaction absorbs thermal energy and causes a decrease in temperature?

• Endothermic

• Exothermic

• Law of Conservation of Mass

• Subscript

Which type of reaction releases thermal energy and causes an increase in temperature?

• Endothermic

• Exothermic

• Law of Conservation of Mass

• Subscript

According to the Law of Conservation of Mass, what happens to matter in a chemical or physical change?

• It is created

• It is destroyed

• It is conserved

• It is evaporated

What does a subscript represent in a chemical formula?

• The number of atoms in a molecule

• The number of molecules in a reaction

• The number of products in a chemical change

• The number of reactants in a physical change

What does a coefficient indicate in a chemical equation?

• The number of atoms in a molecule

• The number of molecules in a reaction

• The number of products in a chemical change

• The number of reactants in a physical change

Physical Change

• Unexpected color change

• precipitate forms

• bubbles form

• change in state

Chemical Change

• Precipitate forms

• change in shape

• change in size

• change in color (adding food dye)

Balance the chemical equation

Balance the chemical equation

Balance the chemical equation