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Page 1

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Several experiments were set up with magnesium metal
and dilute hydrochloric acid

Page 2

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Observations

Concentration ­ faster
Longer lasting - weaker

Conclusion

As the concentration increases the reaction gets faster




Observations

Hotter temperature - faster

Conclusion

As the temperature increases the reaction gets faster




Observations

Smaller ­ fizz
Small ­ not dissolve

Page 3

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Smaller ­ fizz longer

Conclusion

As the surface area increases the reaction gets faster




Rate (speed) of reaction

In industry it is important to be able to measure the rate
(speed) of a reaction and what factors affect it
Sometimes you want to speed up a reaction to produce
more…

Page 4

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Measuring the rate

You can either measure the rate of disappearance of a
reactant or the rate of appearance of a product
e.g. in our experiment with magnesium and acid
magnesium + hydrochloric magnesium + hydrogen
acid chloride
Mg + 2HCl MgCl + H

Measuring rates

The slope (or gradient)…

Page 5

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The rate of reaction can be measured by the gradient of
the line
The steeper the line, the faster the reaction

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