"Y8 recap": HTML5 Crossword

Across

1. We measure 'mass' in this unit (9)
4. A more reactive metal will ________ a less reactive metal in a reaction (8)
6. This metal is not very reactive, it has the symbol Cu (6)
8. The plant at the bottom of a food chain is given the name... (8)
9. Magnets have a north and south... (4)
12. A type of acid we use a lot in school, has the symbol HCl (12)
15. Some metals react with water and oxygen - this produces brown/orange spots called ... (4)
16. This is the unit for 'force' (6)

Down

2. On a distance-time graph, the faster an object is moving, the _______ the gradient will be (7)
3. On a distance-time graph, a horizontal line means the object has... (7)
5. A piece of equipment used to measure the angles of rays (10)
7. This is a reactive, silvery metal, with the symbol Mg (9)
10. When light refracts it changes speed and ... (9)
11. When light reflects, the angle of reflection is the same as the angle of ... (9)
13. To show the direction that a light ray travels in your can draw an _____ on the ray (5)
14. This is common metal - it is used in magnets. It has the symbol 'Fe' (4)
17. To calculate the speed of an object you divide the distance by... (4)