4.3.4 Effect of Temperature Flashcards
How do you increase temperature?
Heating
What is an experiment that investigates the effects of temperature on rate?
The effect of temperature on rate can be demonstrated by reacting magnesium with hydrochloric acid:
Mg(s) + 2HCl(aq) –> MgCl2(aq) + H2(g)
In this reaction, the magnesium disappears. Variables:
- Independent: the temperature of the HCl (aq)
- Dependant: the time taken for Mg (s) to disappear
- Control: mass and surface area of Mg (s) and volume and concentration of HCl (aq)
Rate is then calculated from the times taken - rate = 1/time (s)
What does the graph of temperature against rate look like?
It is not a straight line and therefore rate is not proportional to temperature. It does not go through the origin because rate isn’t zero at 0 degrees.
