Chemical Reactions

Burning a match, a hand warmer, the sun. These are all examples of...

• Endothermic Reactions

• Exothermic Reactions

• Physical Reactions

  (neither of the first two)

Tags

NGSS.MS-PS1-2

An ice cubs melting, chopping wood, cutting a chicken nugget. These are all examples of...

• Endothermic Reactions

• Exothermic Reactions

• Physical Reactions

  (neither of the first two)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Vinegar and Baking Soda, cooking a marshmallow, baking a cake. These are all examples of...

• Endothermic Reactions

• Exothermic Reactions

• Physical Reactions

  (neither exothermic nor endothermic)

Tags

NGSS.MS-PS1-5

NGSS.MS-PS3-4

Which term best fits this definition? "Substances can only be changed or moved, they cannot be created or destroyed."

• The law of conservation of matter

• Endothermic Reactions

• Exothermic Reactions

• The law of conservation of energy

Tags

NGSS.MS-PS1-5

A chemical reaction that becomes cold is...

• endothermic

• exothermic

• neither

Tags

NGSS.MS-PS1-4

A chemical reaction that becomes hot is...

• endothermic

• exothermic

• neither

Tags

NGSS.MS-PS1-4

We have experienced several chemical reactions where the product weighs less than the weight of both reactants added together. Such as mixing vinegar and baking soda. Why is this?

• Some of the atoms are destroyed when they react chemically

• Some of the atoms escape as a gas

• We forgot to subtract the weight of the cup

• We forgot to press the "tare/zero" button

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

We have experienced several chemical reactions where the product weighs more than the reactant. Such as burning steal wool. Why is this?

• Some atoms are created when they react chemically

• Some of the atoms reacting were in the air and were not measured before the reaction

• We forgot to subtract the weight of the cup

• We forgot to press the "tare/zero" button

Tags

NGSS.MS-PS1-5

In an endothermic reaction, what is happening to the heat energy?

• It's temperature increases because it steals heat from its surroundings.

• It's temperature decreases because heat energy is being spent to make chemical bonds.

• It's temperature increases because it breaks chemical bonds and releases heat energy.

• It's temperature decreases because energy is being destroyed and lost.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In an exothermic reaction, what is happening to the heat energy?

• It's temperature increases because it steals heat from its surroundings.

• It's temperature decreases because heat energy is being spent to make chemical bonds.

• It's temperature increases because it breaks chemical bonds and releases heat energy.

• It's temperature decreases because energy is being destroyed and lost.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4