Description
i need to solve all problems according the data and pre-lab(2) questions and pre-lab(3) questions, but please i don't want very long answers. thanks
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Explanation & Answer
Here are the answers of the questions ;)
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Date:
Experiment #2 Pre-Lab Questions
Answer:
1. Classify each of the following as a pure substance or a mixture:
(a) Ammonium chloride: pure substance.
(b) Silicon dioxide: pure substance.
(c) Gasoline: mixture.
(d) Iodine crystals: pure substance
2. Define the terms "pure substance” and “mixture".
Answer:
Pure substances are defined as substances that are made of only one type of atom or only one
type of molecule. A mixture is a combination of two or more pure substances in which each pure
substance retains its individual chemical properties
3. In this experiment what particular method did you use to separate ammonium chloride from
the mixture? What safety precaution do you need to know when you use this method of
separation?
Answer:
The ammonium chloride can be separated from the mixture by the process called sublimation.
On a tripod stand a china plate having mixture is placed and it is heated. The safety precaution is
that, Cotton should be used at the terminal end of funnel.
4. What other safety precautions do you need to be aware of before you start the experiment?
Answer:
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Safety goggles must be worn at all times w...