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C8: Quiz 1
C8: Quiz 1
1) What is the definition of a pure substance?
2) Fill in the gaps in the sentence below with the phrases “over a range of temperatures” and “at a single temperature”
Pure substances melt/ boil ___________. Impure substances melt/ boil ___________.
3) Fill in the gaps in the paragraph below with the words “higher” and “lower”
The melting point of an impure substance will be _______ than the melting point of the pure substance.
The boiling point of an impure substance will be _______ than the boiling point for the pure substance.
4) We have 2 samples of a substance with different impurities; substance A and substance B. Substance A melts at 80°C and substance B melts at temperatures between 76-79°C. Which substance is the most impure? Explain your answer.
5) Pure water boils at 100°C.
We have 2 solutions of saltwater; solution A and solution B. We heat both of these solutions to find their boiling points. Solution A has a boiling point of 100.9°C and solution B has a boiling point of 101.2°C.
Suggest which substance has a greater concentration of salt. Explain your answer.
6)
a) What is a formulation?
b) Give two examples of formulations.
2) Fill in the gaps in the sentence below with the phrases “over a range of temperatures” and “at a single temperature”
Pure substances melt/ boil ___________. Impure substances melt/ boil ___________.
3) Fill in the gaps in the paragraph below with the words “higher” and “lower”
The melting point of an impure substance will be _______ than the melting point of the pure substance.
The boiling point of an impure substance will be _______ than the boiling point for the pure substance.
4) We have 2 samples of a substance with different impurities; substance A and substance B. Substance A melts at 80°C and substance B melts at temperatures between 76-79°C. Which substance is the most impure? Explain your answer.
5) Pure water boils at 100°C.
We have 2 solutions of saltwater; solution A and solution B. We heat both of these solutions to find their boiling points. Solution A has a boiling point of 100.9°C and solution B has a boiling point of 101.2°C.
Suggest which substance has a greater concentration of salt. Explain your answer.
6)
a) What is a formulation?
b) Give two examples of formulations.