Ch 6 USA review

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet that is created by electric current. It can lift heavy metal objects but does not attract non-metal materials like plastic.

Front

What properties determine which key opens which lock?

Back

The size and shape of the key and lock are the determining properties for compatibility.

Front

What happens to a metal rod when it is heated?

Back

A metal rod expands when heated, which is an example of a physical change.

Front

Why might stirring a mixture of sugar and water not be useful in an investigation?

Back

Stirring is a different variable that affects the speed of dissolving, which could interfere with the results.

Front

What conclusion can be drawn about sugar dissolving in water?

Back

Crushing a sugar cube will increase the speed at which it dissolves in water.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is the role of heat in dissolving substances?

Back

Heat can increase the speed at which substances, like sugar, dissolve in water.

Front

What is a variable in an experiment?

Back

A variable is any factor, trait, or condition that can exist in differing amounts or types and can affect the outcome of an experiment.

Front

What is a solution?

Back

A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).