Mod J Unit 3 Lesson 1 Quiz - Chemical Reactions

Which process is an example of a chemical change?

• cooking a steak

• chopping a tree

• heating a cup of tea

• drying clothes in the dryer

Which property could be used to identify a substance?

• mass

• weight

• density

• volume

Austin has a mixture of iron filings, sand, and salt. To separate them he uses a magnet, boiling, and a filter. Which is true?

• Austin uses only physical changes to separate the components.

• Austin uses only chemical changes to separate the components.

• Austin uses both physical and chemical changes to separate the components.

• Austin uses neither physical nor chemical changes to separate the mixture.

Which indicates that a chemical reaction has taken place?

• A loud noise produced when crushing a can.

• A puddle produced by melting an ice cube.

• An odor produced by burning a sugar cube.

• A shard of glass produced by breaking a bottle.

A chemical reaction occurs. Which is true of the reactants and the products?

• Atoms in the products are regrouped into different molecules to form reactants.

• Atoms in the reactants are regrouped into different molecules to form the products.

• Atoms in the products were destroyed and new molecules appeared to form the reactants.

A student observed a precipitate form during a chemical reaction. Which did the student most likely observe?

• Bubbles of gas floated to the top of a solution.

• The color of the liquid changed when a solid was added.

• Steam rose from a flask when powder was added to the liquid.

• A solid sank to the bottom of a container when two liquids were mixed.

Which process is an example of a chemical change?

• Salt mixes with water and dissolves.

• An aspirin tablet is crushed into a fine powder.

• Water droplets form on the outside of as cold drink glass.

• An antacid tablet is added to water and bubbles are produced.

Which is the best evidence that a chemical change has occurred?

• The apple is smaller after being cut.

• The apple is turning brown.

• The apple has changed shape.

Two metals are placed the same liquid. What evidence indicates that a chemical reaction is happening in one of the beakers? Check all that apply.

• A gas is being given off.

• There is a change in color.

• The solution is clear and colorless.

• Bubbles are forming.

Based on what you observed in the beakers, which is true?

• Chemical reactions can always be seen.

• The two samples are different substances.