Unit 2 Review

Front

Which of the following IS a physical change? boiling water, iron oxidizing (rusting), sour milk, burning paper

Back

boiling water

Front

Rayon is a synthetic material. Because it's synthetic, what is rayon most likely made from?

Back

Natural resources such as coal, water, petroleum (oil) or plants.

Front

If there are 18 atoms of oxygen in the reactants, how many atoms of oxygen will there be in the products?

Back

18

Front

How does the mass of the reactants in the equation compare to the mass of the products?

Back

It's the same.

Front

A chemical reaction that absorbs energy is called an

Back

endothermic reaction

Front

When two substances were mixed they produced bubbles, changed color and produced an odor. This was most likely a

Back

chemical change

Front

Synthetic fibers are made from raw materials that go through:

Back

chemical changes

Front

A chemical reaction that feels cold is an endothermic change. This means it

Back

absorbs energy

Front

During a lab in science class you mix two substances. They change temperature and produce a layer that's a different color. They most likely:

Back

reacted chemically

Front

Dissolving a substance is a:

Back

physical change