1.
2.
3.
A student investigated displacement reactions of metals.
The student added different metals to copper sulfate solution and measured the
temperature change.
The more reactive the metal is compared with copper, the bigger the temperature
change.
(a)
The apparatus the student used is shown in Figure 1.
Figure 1
-Thermometer
Copper sulfate solution
Metal
State three variables that the student must control to make his investigation a fair
test.
