Unit 3: Chemical Analysis

Question 1

Chromatography

Answer 1

Separates components present in a mixture.

Question 2

Pieces of information from gas chromatogram

Answer 2

Number of compounds in mixture (number of peaks)
How much of each compound is present (higher peak=more)
Retention time (position of the peak)

Question 3

Standard solution

Answer 3

Solution whose concentration is known accurately

Question 4

Making a standard solution

Answer 4

1. Correct mass accurately measured
2. Dissolve measured solid in small quantity of water in a beaker
3. Once dissolved, solution is carefully poured into standard flask. Beaker needs to be rinsed with water and rinsings added to standard flask - repeat 2 or 3 times
4. Water added to fill line
5. Flask is stoppered and inverted to ensure solution mixed