Across
- 3. The elements in group 7 of the periodic table
- 4. A substance with a pH between 1 and 6
- 7. The largest artery in the human body
- 8. The release of energy from food
- 9. A substance used to speed up or slow down a chemical reaction
- 13. The light shadow of an eclipse
- 14. The ability to do work, measured in Joules
- 15. The force that opposes the motion of two objects in contact
Down
- 1. The force of gravity on an object that acts down towards the centre of a planet
- 2. The part of the blood that helps it to form scabs/clot
- 5. A substance that changes colour depending on the pH of a substance.
- 6. The thinnest type of blood vessel
- 10. The smallest part of an element that still has the properties of that element
- 11. The distance an object travels per unit time, measured in m/s
- 12. Speed in a particular direction