Chem 3 L4 Recap

A neutron has what charge?

• Positive

• Negative

• It has no charge (it is neutral)

A proton has what charge?

• Positive

• Negative

• It has no charge (it is neutral)

An electron has what charge?

• Positive

• Negative

• It has no charge (it is neutral)

How many electrons does oxygen have?

• 8

• 16

• 2

• 15

How many neutrons are in magnesium?

• 12

• 24

• 25

• 36

Slate is a dark rock showing crystals and layers. It was formed by shale being changed by heat and pressure. What kind of rock is it?

• Sedimentary

• Igneous

• Metamorphic

Chalk is a white rock formed from the shells of sea animals which collected at the bottom of shallow seas. What kind of rock is it?

• Sedimentary

• Igneous

• Metamorphic

Granite is a speckled rock. The speckles are different crystals that have formed from melted rock which cooled slowly inside the earth. What kind of rock is it?

• Sedimentary

• Igneous

• Metamorphic

Pumice is a rock that contains air bubbles. It is formed by volcanic rock cooling and trapping air inside. What kind of rock is it?

• Sedimentary

• Igneous

• Metamorphic

Look at the rock in the image. What kind of rock do you think it is?

• Sedimentary

• Igneous

• Metamorphic