Chemistry Chemical Reactions Review

What are substances that occur BEFORE the reaction?

• Reactants

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

This describes a chemical reaction in which energy is given off. The final product will feel warmer than the original reactants.

• Endothermic

• Exothermic

• Elephant Toothpaste

• Exoheater

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

This describes a chemical reaction in which energy is absorbed. The final product will feel cooler than the original reactants.

• Endothermic

• Exothermic

• Elephant Toothpaste

• Exoheater

Tags

NGSS.MS-PS1-4

When a gas is created is an indicator for a _____________________ reaction

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Tags

NGSS.MS-PS1-1

A copper penny turning greenish after a few years is an example of ...

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

What are substances that occur AFTER the reaction?

• Reactants

• Products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is NOT an indicator for a chemical reaction?

• brand new colour

• new odor

• evaporation

• light is given off

Tags

NGSS.MS-PS1-2

A chemical reaction is taking place in a sealed container. What will happen to the mass of the materials in this sealed (closed) container?

• It will depend on which chemical reaction occurs.

• The mass will stay the same.

• The mass will increase.

• The mass will decrease.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student places some baking soda and a jar of lemon juice in a plastic bag and seals the bag. She weighs the bag and everything in it. She shakes the bag so that the lemon juice spills out of the jar and mixes with the baking soda inside the bag. The student observes that bubbles form and the bag expands. If the student weighs the bag and everything in it after the bubbling stops and compares the final weight to the starting weight, what will she find out?

• The final weight will be the same as the starting weight because the number of each kind of atom does not change during the experiment.

• The final weight will be greater than the starting weight because new atoms are produced during the experiment.

• The final weight will be the same as the starting weight because some atoms are destroyed, but new ones are created during the experiment.

• The final weight will be less than the starting weight because some of the atoms are destroyed during the experiment.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5