1. What is the test for carbon dioxide gas?

2. If a chemical is inert what does this tell you about it?

3. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.

The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:

• Mass of empty crucible + lid  = 51.2g
• Mass of crucible + lid + magnesium (before heating) = 54.3g
• Mass of crucible + lid + contents (after heating) = 54.7g

 

What is the word equation for the reaction that takes place?
 

4. What type of animal is a 'Portuguese Man of War'?

5. Substances that help build and repair body tissues (like skin and muscle) will be high in which food substance?

6. What formula is used to calculate density?

7. Where are ova (eggs) made in the human body?

8. What is the chemical formula for CHALK (calcium carbonate)?

9. What name is given to the outer layer of the Earth's atmosphere?

10. The diagram shows a human embryo.

Which label represents the placenta?