BEST Chemical reactions 4

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

• purple color

• smoke

• ice formation

• fire

• a yellow precipitate

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

The result of the experiment between Iodine and Aluminum was the production of __________________.

• clear liquid.

• a white powder.

• yellow precipitate.

• bubbles.

When zinc reacted with hydrochloric acid, what was the result of this reaction?

• a white powder

• a blue liquid

• a brown precipitate

• a gas

We know that there was a chemical reaction occurring when 2 clear liquids were mixed together. That is because we show the production of a _____________.

• solid.

• precipitate.

• gas.

A precipitate is a ___________ that forms when 2 liquids react together.

• solid

• liquid

• gas

• plasma

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.

Which of the following is evidence of a chemical reaction?

• Tearing paper.

• Change in color.

• Production of a gas.

• Change in temperature.

• Production of a precipitate.