Pass Check: Chemical Reactions
Chemical reactions, energy changes, rates of reaction and equation balancing.
Exothermic reaction
A reaction that transfers energy to the surroundings, usually shown by a rise in temperature.
Endothermic reaction
A reaction that takes in energy from the surroundings, usually shown by a fall in temperature.
Catalyst
A substance that increases the rate of a reaction without being used up, by providing a pathway with a lower activation energy.
Rate of reaction
How quickly reactants are used up or products are formed in a chemical reaction.
Quick check
Mixed quiz
1. Which is a fair test variable to change in a rate experiment?
2. Acid + carbonate → salt + water +?
3. Why does electrolysis of copper sulfate solution with copper electrodes purify copper?
4. Calculate the mean rate over 60 s if 3.6 g of gas is lost.
5. Which titration result should be used for the mean?
6. What is reduction in terms of electrons?
7. What is the test for oxygen?
8. Why is 450 °C used in the Haber process despite reducing yield?