1. Investigating how Concentration Effects the Rate of Reaction
OBJECTIVES
Carry out experiments safely
Find out what happens to rates of reactions when concentration is increased
Explain results scientifically

2. Apparatus and Chemicals
Boiling tube
Test tube rack
Ruler
Stopwatch
Measuring cylinder
Scissors
Boiling tube
Sulphuric acid
Magnesium

3. Method Set up the equipment as shown in the diagram
Add 10cm3 of sulphuric acid.
Time how long it takes for 5cm of magnesium ribbon to disappear.
Repeat with the following amounts of water and acid;
10cm3 of acid.
8cm3 of acid + 2cm3 water
6cm3 of acid + 4cm3 water
4cm3 of acid + 6cm3 water
2cm3 of acid + 8cm3 water

4. Time for 5cm of Mg ribbon to disappear (s)
Results Table
Volume of acid (cm3)
Volume of water (cm3)
Time for 5cm of Mg ribbon to disappear (s) 10 8 2 6 4

5. Graph
Time for magnesium ribbon to disappear (s)
Volume of acid (cm3)

6. Conclusion
When the concentration of the acid is high (lots of acid) the hydrogen is made ________. When the concentration of acid is low (lots of water) the hydrogen is made ________
QUICKLY
SLOWLY

7. The rate is ______ when the _______________ is high because there are lots of _____ particles available to react with the metal.
The rate is _____ when the _______________ is low because there are not many _____ particles available to react with the metal.
FAST
CONCENTRATION
ACID
SLOW
CONCENTRATION
ACID