Answer:
GRAPH 1
Conclusion: The graph represents temperature of a pure substance.
Explanation: From 0 to 6 minutes, temperature of the substance increases from 20°C to 80°C. Then it remains constant at 80°C from 6 to 10 minutes.
Pure substances only have a constant temperature at which they start boiling.
GRAPH 2
Conclusion: The graph represents temperature of impure substance.
Explanation: From 0 to 6 minutes, temperature of the substance increases rapidly from 20°C to 80°C. Then it slowly increases from 80°C to 90°C from 6 to 10 minutes.
Hence implies it is an impure substance.
