chem topic 13

Question 1

1. What is the name of the type of analysis which just identifies that a particular chemical is present?

Answer 1

Qualitative

Question 2

2. What is the name of the type of analysis which determines the quantity of a particular chemical present?

Answer 2

Quantitative

Question 4

Describe how a flame test could be carried out.

Answer 4

Dip a wire loop in some water to dampen it, place it into the solid to be tested and place into a Bunsen Flame.

Question 5

What information can be obtained from doing a flame test?

Answer 5

The metal ion that is present based on the colour of the flame

Question 5

Is flame testing qualitative or quantitative analysis?

Answer 5

Qualitative

Question 5

What is the name given to the type of reaction that can be used to determine the presence of chloride ions?

Answer 5

Precipitation

Question 6

What experimental method could be used to do a quantitative analysis of an acid or an alkali?

Answer 6

Titration

Question 7

How would you test for a metal carbonate?

Answer 7

Add the metal carbonate to acid, observe fizzing. If the gas is collected this can be tested using limewater which will turn cloudy/milky as carbon dioxide is produced (metal carbonate + acid → salt + water + carbon dioxide)

Question 8

Describe the tests for:
Oxygen

Answer 8

Place a glowing splint into the test tube and if oxygen is present the splint will relight

Question 9

Describe the tests for:

Hydrogen

Answer 9

Place a lit splint into the test tube and if hydrogen is present a ‘squeaky pop’ will be heard

Question 10

Describe the tests for:

Carbon dioxide

Answer 10

Add some limewater to the test tube and if carbon dioxide is present, the limewater will turn cloudy/milky