testing

Question 1

What elements can be detected by a flame test?

Answer 1

Lithium, sodium, potassium, calcium, barium

Question 2

What elements can be found by adding sodium hydroxide solution?

Answer 2

Positive ions; Aluminium, calcium, magnesium, copper, iron (II), iron (III), ammonium

Question 3

What elements are found by adding sliver nitrate solution?

Answer 3

Halides; Chloride, Bromide, iodine

Question 4

What can indicate the presence of a sulphate?

Answer 4

Barium chloride solution and a white precipitate.

Question 5

What can be found by adding sodium hydroxide solution and aluminium powder?

Answer 5

Nitrates, they aren’t soluble so add- and if the gas turns red litmus paper blue it is a nitrate reduced to ammonia.

Question 6

What instrumental method can be used to identify metal ions in drinking water or metal alloys?

Answer 6

Atomic spectroscopy

Question 7

What instrumental method can be used to identify individual compounds e.g. detecting pesticides in water?

Answer 7

Infred spectroscopy

Question 8

What instrumental method can be used for determining the concentration of nitrates or phosphates in water?

Answer 8

Ultraviolet spectroscopy

Question 9

What instrumental method would be used for detecting organic molecules?

Answer 9

Nuclear magnetic resonance spectrometry

Question 10

What instrumental method separates molecules or atoms according to their mass?

Answer 10

Mass spectrometry

Question 11

What instrumental method is a useful way of separating mixtures?

Answer 11

Gas liquid chromatography