You performed this reaction: 2Al + 3CuSO4 --> Al2(SO4)3 + 3Cu You used 1.87g Al.

What is the theoretical yield of Cu you will make?

The actual yield of the reaction was 5.55g Cu

What is the percent yield?

a
The theoretical yield will be 2.9g Cu, the percent yield is 191%
b
The theoretical yield will be 6.6g Cu, the percent yield is 83.96%
c
The theoretical yield is 2.9g SiC. The percent yield is 52.25%
d
The theoretical yield is 6.6g SiC. The percent yield is 119%

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e