Review for Assessment 2

Front

What does the law of conservation of mass state?

Back

In a reaction, atoms are not lost or made.

Front

What does it indicate if gastric juices turn dark red when tested on litmus paper?

Back

It is very acidic.

Front

How can you determine if a change is physical or chemical?

Back

A physical change alters the form or appearance of a substance without changing its composition.

Front

What is the only substance with a neutral pH of 7?

Back

Water.

Front

What does the Law of Conservation of matter state about the total amount of matter after a change?

Back

The total amount of matter stays the same.

Front

Define a physical change.

Back

A change that affects one or more physical properties of a substance.

Front

Define a chemical change.

Back

A change that results in the formation of new chemical substances.

Front

What is the pH range of acidic solutions?

Back

A pH less than 7.

Front

What is the pH range of basic (alkaline) solutions?

Back

A pH greater than 7.

Front

What is an example of a physical change?

Back

Melting ice.