SC 5 E 7 2

Reactants are the chemicals that are present at the beginning of an experiment. Reactants react together to make the product.

We can know that a chemical reaction is occurring when we see ______.

• that the product looks just like the reactants.

• nothing new.

• that the product looks different from the reactants.

Tags

NGSS.MS-PS1-2

What type of reaction occurs in a hand warmer?

• exothermic

• endothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which of the following are examples of an Exothermic Reaction?

• Cooking an egg

• Plants making sugar through photosynthesis

• Dynamite exploding

Tags

NGSS.MS-PS1-4

____ reactions usually feel cold.

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm

• Cold

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What instrument would you use to detect an endothermic or exothermic reaction?

• triple beam balance

• ruler

• thermometer

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Have you ever eaten sherbet sweets? They fizz in your mouth and your tongue feels cold. Why do you think that is?

• It is an exothermic reaction

• It is an endothermic reaction

• It is made of ice

• It is dissolving your mouth

Tags

NGSS.MS-PS1-2

During an exothermic reaction, heat is _________ and chemical bonds __________.

• released, formed

• absorbed, broken

• released, broken

• absorbed, formed

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Connor wants to grow up to be a weatherman on television. He is trying to learn all that he can about what causes different types of weather. One night he saw on a science show that 90% of the evaporated water that goes into the water cycle comes from one source.
What is the largest source of water for the water cycle?

• freshwater lakes and rivers

• underground storage

• glaciers

• oceans

Tags

NGSS.MS-ESS2-4

What change in the water cycle could best account for the differences in the level of water in the lake?

• decreased precipitation

• increased precipitation

• decreased evaporation

• increased runoff

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-4