Chemical Changes
Water
Properties
100

Name 3 identifiers of a chemical change.

Bubbles, gives off heat, gives off light, changes color, gives off a smell

100

When water turns from a liquid to a gas.

Evaporation

100
When identifying something using identifiers like green, orange, red, blue, purple, what are you identifying?

The color of an object.

200

Is toast an example of a physical change or a chemical change? Why?

Toast is an example of a chemical change because there is a color change, a smell is given off, and you cannot return the toast to its original condition.

200
If I have 100mL of water as a liquid and I put it in a freezer and it turns into a solid, how much water will I have when it becomes a solid (ice)? 

100mL

200

When testing an object to see if it sticks to a magnet, you are testing the objects...

Magnetism

300

When your bicycle begins to rust, is this an example of a physical change or a chemical change? Why?

It is a chemical change because there is a change in color and the hardness/properties of the metal change.

300

If I left a sealed cup that has 100mL of water outside in the 100 degree weather. How much water will be left at the end of the day?

100mL

300

Identifying an object based on how the object feels, you are identifying the objects...

Texture

400

If I do an experiment and the substance I began with has the following results, is it a chemical change or a physical change? 

Changes color: no

Gives off heat: yes

Bubbles: no

Gives off light: no

Gives off a smell: no

Yes

400

When water molecules in a gas begin to slow down and change back to a liquid.

Condensation

400

What material is typically used as an electrical conductor?

Are all of these types of material good conductors?

What 2 materials do we typically use as electrical conductors?

Metals, but not all metals are good conductors. Silver and Copper are two of the best that we consistently use. 

500

When you bake a batch of cookies, are you creating a physical change or a chemical change?

Baking cookies is an example of a chemical change because your ingredients all combine to make a new substance. There is also a smell given off. 

500

Explain why the 12oz steak you order only weighs 10oz after you cook it.

When you cook food, water is lost through evaporation, so the mass of the food becomes less. 

500

When identifying if an object dissolves in water, you are testing the if the item is...

Soluble or solubility

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