Key Concepts Rewrite the following sentences in your copybook and fill in the blanks. 1. A chemical reaction happens when the ________________ in a set of materials break apart and/or join together to form a different set of ______________. 2. Four factors that can affect the rate of chemical reactions are:
________________, _________________, _________________ and ________________
3. An effervescent tablet will react faster if its particle size is _________________. 4. Rate of reaction = _________________. 5. Rate of reaction is measured in _________________. 6. Vinegar and baking soda react to form _________________ _________________. 7. Carbon dioxide can be formed from the reaction of hydrochloric acid with _________________.
8. Hydrogen peroxide breaks down gradually over time to produce _________________ and _________________.
9. _________________ control all the reactions in the human body. 10. The function of enzymes is particularly affected by _________________ and _________________.
11. _________________ is found in saliva and it converts starch to maltose. 12. An _________________ reaction is one that gives out heat. 13. An _________________ reaction is one that takes in heat. 14. _________________ _________________ diagrams show the energy changes that take place during a chemical reaction.
K U
Knowledge and Understanding 1. The graph shows how the rate of reaction changes as temperatures increases.
Temperature (o
C)
How would the graph differ if you were to draw a graph to compare temperature with time taken for the reaction to take place?
2. Draw a bar chart of the results you would expect from an experiment to measure the effect of particle size on the time taken for a reaction.
