Across
- 9. What must a collision be to cause a reaction?
- 10. What kind of reaction gives off heat to the surroundings?
- 12. What do particles need to do in order to react?
- 13. what gas is given off when metal reacts with acid?
- 15. What gas turns lime water cloudy?
- 17. What happens to rate of reaction when temperature is lowered?
- 18. What type of energy do particles need to react?
- 19. What gas is given off when hydrogen peroxide decomposes?
Down
- 1. What kind of reaction absorbs heat from the surroundings?
- 2. A ____________________ is used during experiment to allow gas to escape
- 3. Which factor affects the number of particle per unit volume?
- 4. Particle moves _____________ when temperature increases
- 5. What word describes how often reacting particles collide?
- 6. Minimum energy that colliding particles must have for reaction to occur
- 7. What do you increase when you break a solid into smaller piece?
- 8. What unit is commonly used to measure reaction time?
- 11. What speeds up a chemical reaction without being used up
- 14. Colour of thymolphthalein in alkali solution
- 16. What is the most important apparatus to collect gas