What is a chemical change?

• a chemical change is when the size of matter changes

• a chemical change is when a new matter is formed.

What 3 examples are chemical change?

• size, temperature, cooking food.

• freezing point, melting point, size

• rusting iron, burning wood, cooking food

• all of the above

What is considered a chemical reaction?

• broken class

• baked cake

• burning fire

• cutting wood into pieces

The two factors that can affect the speed of chemical reactions are:

• state of matter and magnetism

• temperature and filtration

• particle size and temperature

• all of the above

Calculate the mass of the oxygen of the chemical reaction:

10g iron + ?g oxygen = 25g rust

• 15 g

• 20 g

• 10 g

• 35 g

Observable changes in a test of a substance are known as:

• physical changes

• chemical changes

• positive results

• negative results

Describe the difference between chemical and physical change.

• Physical changes do not produce new substances, while chemical changes do produce new substances.

• Physical changes do produce new substances, while chemical changes do not produce new substances.

In a chemical reaction. If bubbles do appear, this is called ________ result.

• positive

• negative

• chemical

In a chemical reaction. If bubbles do not appear, this is called a _________result.

• positive

• negative

• physical

You are given a mixture of saltwater, sand, and iron flakes. Identify the solution in this mixture.

• saltwater

• sand

• iron flakes

• all of the above