chemistry

1. Which gas was present in the early earth atmosphere?

You said: Ammonia

 Correct.

2. What do scientists think was responsible for much of the gases in the early earth atmosphere?

You said: Volcanoes

 Correct.

3. Which gas makes up nearly 80% of our current atmosphere?

You said: Nitrogen

 Correct.

Types of rock

1. Granite is an example of which type of rock?

You said: Igneous

 Correct.

2. Which type of rock is it most likely to be if it contains fossils?

You said: Sedimentary

 Correct.

3. What type of crystals will an extrusive igneous rock have?

You said: Small

 Correct.

4. Which type of rock is formed from cooled magma?

You said: Igneous

 Correct. Cooled magma forms igneous rocks.

calcium carbonate 1. Limestone, chalk and marble are all examples of which compound?

You said: Calcium carbonate

 Correct.

2. What is the process known as where a compound is broken down using heat?

You said: Thermal decomposition

 Correct.

3. Which carbonate would break down easiest?

You said: Copper carbonate

 Correct.

4. Which calcium compound is used to remove acidic gases from coal fired power stations?

You said: Calcium carbonate

 Correct

Metals

. How would potassium be extracted from…