Matter Changes 2

Matter Changes 2

This is the time to work on chemical changes. Let's see how much you can analyze them!

Multiple Select

Chemical changes are...

• when you create a new substance.

• when you do not create a new substance.

• when you alter the color of the substance.

• when you change the appearance of the substance.

• when you create a chemical reaction.

Multiple Choice

Every chemical change is reversible.

• It is true because you can reverse water to become ice again.

• It is false because you cannot get ice as it was before.

• It is false because you can get the ingredients out of a cake.

Multiple Select

When we alter the odor of the substance,

• we create a chemical change.

• we can have the substance as it was before.

• the odor changes creating a new substance.

Multiple Choice

When we cook, we create a new substance.

• It is true because we cannot have the ingredients as they were before.

• It is false because boiling water is a physical change.

• It depends because when applying heat, then it is a chemical change.

Multiple Choice

Oxygen is needed when burning wood.

• It is true because without it, you would not have fire.

• It is false because carbon dioxide is used when burning a substance.

Multiple Choice

We get heat when burning wood.

• True

• False

Multiple Select

When burning wood, we know that it is a chemical change because...

• it becomes ashes.

• its color changes.

• its odor changes.

• we get heat from it.

Multiple Select

When litting a candle,

• carbon in the wax reacts with oxygen.

• oxygen and carbon in the wax forms carbon dioxide and water vapor (gas).

• it is melted by the heat.

Multiple Select

Natural gas...

• consists of methane.

• can be used as fuel.

• is used for physical and chemical changes.

• needs carbon dixide to be produced.

Multiple Choice

Bicarbonate of soda is baking soda.

• True

• False

Multiple Select

When mixing baking soda and vinegar,

• you have a physical change.

• you create a chemical reaction.

• you can observe bubbles of carbon dioxide gas.

Multiple Choice

Another example similar to the plaster of Paris is

• water and cement.

• soda and water.

• helium and water.

Multiple Choice

Plaster of Paris is used to make...

• concrete.

• houses.

• casts to support broken bones.