1. Which of the features listed would be found in ALL living cells?

2. Why is the mineral Iron important in our diet?

3. At which of the times below will your shadow be the shortest?

4. 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 a white ash could be seen in the crucible.
The crucible + ash + 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 name of the white ash that remains in the crucible after the experiment 

5. You have four substances which you label A, B, C and D.
One is a mixture, one a metallic element one a non-metallic element and one a compound.

They have the following properties:

A	A yellow, crumbly solid that burns to form a single, colourless gas which turns universal indicator red.
B	A grey, malleable solid that burns to form a single, white, alkaline oxide.
C	A colourless liquid. The liquid is warmed in a shallow dish and after a few minutes a white residue is seen.
D	A green solid that decomposes when heated to form a colourless gas and leave a black powder.

Which of the substances is likely to be a mixture ?

6. Which would have the greatest volume (take up the most space),
1kg of water, 1kg of wood or 1kg of feathers

7. Put the following processes into the correct order if you wished to obtain pure salt from rock salt

8. A solar eclipse happens when

9. What needs to be done to make a guitar string sound higher

10. After a girl reaches puberty, how often will her body release an egg?

11. If you went to the moon what would happen to your weight?

12. The best way to remove sand from water is

13. What force holds a planet in orbit around the sun?

14. A firework rocket is resting in its launcher at position 1.
After being lit the rocket climbs to position 3 (its highest point) from where it falls back to the earth, hitting the ground at position 5.

In what form does the energy exist at position 1?

15. What colour will universal turn when mixed with vinegar?

17. Which planet is nearest to the sun?

18. What is your BLADDER for?

19. Name a substance with a pH value more than pH7

20. If water is added to anhydrous copper sulphate what would be the colour of the product?