Evidence of Chemical Reaction

Which of the following are evidence of a chemical reaction? (Pick more than one.)

• Tearing paper.

• Change in color.

• Production of a gas.

• Change in temperature.

• Production of a precipitate.

Tags

NGSS.MS-PS1-2

You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)

• purple color

• smoke

• ice formation

• fire

• a yellow precipitate

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NGSS.MS-PS1-2

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

NGSS.MS-PS1-5

In this chemical reaction, what was the first evidence that you saw?

• Production of fire

• Production of light

• Production of purple smoke

• Production of white powder

Tags

NGSS.MS-PS1-2

Which of the following is NOT evidence that that a chemical reaction has occurred?

• Formation of an oder

• Color change

• Release or absorption of heat or energy

• Melting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Students mixed two liquids in beaker and listed their observations. Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• There is a change in shape.

• There is a change in volume.

• The two liquids mix into a solution.

• The two liquids form a new solution.

Tags

NGSS.MS-PS1-2

The student inferred that a chemical reaction occurred. What evidence supports this

inference?

• A dark solid formed on the zinc metal.

• The zinc metal remained silver-colored and shiny.

• The CuSO solution turned blue when the zinc metal was added.

• None of these

Tags

NGSS.MS-PS1-2

What evidence(s) of a chemical reaction do you see in the pictures? (Select all that are correct)

• Gas

• Precipitate

• Color Change

• Giving off light

Tags

NGSS.MS-PS1-2

Which observation(s) might be used as evidence that a chemical reaction occurred?

• Color change

• Odor change

• change in temperature

• All of the above

Tags

NGSS.MS-PS1-2

What evidence of a chemical reaction do you see in the picture?

• bubbling (bubbles)

• color change

• precipitate

• heat

Tags

NGSS.MS-PS1-2