Chemical and Physical Changes in Digestion

In the laboratory, a blue liquid is mixed with a yellow liquid. What would be the best evidence that a chemical change took place as the liquids were mixed?

• The new liquid is green.

• The yellow liquid floats on top of the blue.

• The formation of a gas.

• No change in the temperature of the new solution.

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NGSS.MS-PS1-2

Which of the following is an example of a chemical change?

• grinding salt crystals to a powder

• the evaporation of water from a mud puddle

• ice melting in a glass

• burning wood in a campfire

Tags

NGSS.MS-PS1-2

All of the following are evidences of a chemical change except -

• a change in temperature

• the production of a gas

• a change in state of matter

• an odor being given off

Tags

NGSS.MS-PS1-2

During digestion the body uses both physical and chemical changes to move and process food. Which of the following is an example of a physical change?

• Teeth breaking food down into smaller pieces.

• Protein breaking down into amino acids in the stomach.

• Enzymes breaking down carbohydrates into simple sugars.

• Hydrochloric acid breaking down fats in the stomach.

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NGSS.MS-LS1-7

Which of the following would indicate the formation of a new substance?

• A liquid turns to a solid.

• A sample of metal melts.

• Bubbles and fizzing occur.

• A solid dissolves in a liquid.

Tags

NGSS.MS-PS1-2

Every chemical change results in -

• a change in temperature.

• the formation of a new substance.

• a color change.

• the formation of a precipitate.

Tags

NGSS.MS-PS1-2

Which of the following is NOT evidence of a chemical change?

• the temperature changes

• a gas forms

• a precipitate forms

• a state of matter change happens

Tags

NGSS.MS-PS1-2

Which of the following is an example of a physical change?

• an explosion

• a solid stays a solid

• a piece of paper is crumpled

• two liquids are mixed and it warms up

When a new substance is formed with different properties than the original substance it is called a

• Chemical change

• Physical change

• Freezing

• Boiling

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following processes in digestion is a chemical change?

• Chewing food to break it into smaller pieces

• Saliva breaking down starches into sugars

• Swallowing food into the esophagus

• Food moving through the intestines

Tags

NGSS.MS-PS1-2