Chemistry GCSE revision

Which two tests show a positive test for water?

Aluminium and lead both produce white precipitate when ammonia is added and when sodium hydroxide is added. To distinguish you can look at the flame tests which shows aluminium as a blue flame.

If you add dilute sulphuric acid to a solution of calcium it will produce a white pecipitate

What are the tests to identify gases in this order: oxygen, hydrogen, carbon dioxide.

Some calcium carbonate was heated strongly in a test tube and a gas was given off. What type of reaction was taking place?

Which of these is the right percentage of element in the air (it is approximated/rounded)

Which of these tests will test for anions?

Ammonia turns red litmus blue

What does Iron(II) form when dilute sodium hydroxide solution is added. The same thing is formed when dilute ammonia solution is added.

The percentage of oxygen in the air can be measured by passing a known volume of air over hot copper and measuring the decrease in volume as the oxygen reacts with it.

Which gases does this method work best in making

Which method is best for producing elements less dense than air ie hydrogen and ammonia

What elements are commonly created in this way and why?

Ammonium ions can be identified in a solution by adding dilute nitric acid and heating. If present, they will be converted to ammonia gas

What does qualitative analysis mean?

What does Quantitative analysis mean?

Which of these are the results for flame tests in this order: Lithium, Potassium, Sodium, Calcium, Barium, Copper, Lead

How many of these results are true when NaOH (sodium hydroxide) is added to them

What can some of the noble gases be used for? (Hint 4 are correct)

If you add dilute hydrochloric acid to bromide, iodide and chloride anions the results will be (in the same order): cream precipitate, yellow precipitate and white precipitate.

[blank_start]Group VII[blank_end] is called the halogens. They have [blank_start]7[blank_end] electrons in their outer shell and react to form [blank_start]ionic and covalent[blank_end] bonds. They exist naturally as [blank_start]pairs[blank_end] and each have a [blank_start]coloured[blank_end] vapour. They form [blank_start]salts[blank_end] when they react with alkali metals.

Hydrogen burns when heated in oxygen to form water. Initially the product will be formed as water vapour, but can be condensed to form water.

Describe the reactions of dilute hydrochloric and dilute sulfuric acids with magnesium, aluminium, zinc and iron

Identify compound A and B with these given test results. When sodium hydroxide solution is added A forms a white precipitate B forms no precipitate. When hyrochloric acid and barium chloride solution is added both form no precipitate. In a flame test A forms a red flame B forms a lilac flame. When nitric acid and silver nitrate is added A produces white precipitate B produces cream precipitate

Is carbon dioxide a greenhouse gas, why? Does it contribute to global warming?

Are these uses for carbon dioxide? Making carbonated drinks, Fire extinguishers.

Group I is called the [blank_start]alkali earth metals[blank_end]. They all have [blank_start]1[blank_end] electron in their [blank_start]outer[blank_end] shell which makes them very [blank_start]unstable[blank_end] and reactive. The reactivity [blank_start]increases[blank_end] as you go down the group. They form [blank_start]ionic[blank_end] compounds with other [blank_start]non-metals[blank_end]. Sodium, Lithium and Potassium react in [blank_start]water[blank_end] to produce the gas [blank_start]hydrogen[blank_end].