1In Chemistry, what is a pure substance?
something made up of only one substance
2What is the difference between the melting and boiling points of a pure and impure substance?
Pure- sharp/one specific temperature. Impure- broad/occurs across a range of temperatures
3What is a formulation?
a mixture designed for a specific purpose.
4What are some examples of formulations?
fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods
5What is chromatography?
a process for separating coloured mixtures
6how is R1 calculated
R1 = distance moved by substance/ distance moved by solvent
7What is the test for hydrogen
a lit splint gives a squeaky pop
8what is the test for oxygen
re lights a glowing splint
9what i the test for carbon dioxide
turns limewater milky when bubbled through it
10what is the test for chlorine
bleaches damp litmus paper
11what is the test for magnesium, aluminium and magnesium ions
forms white precipitate with sodium hydroxide solution
12How can aluminium iojs be distinguished from calcium and magnesium ones
the white precipitate will dissolve with excess sodium hydroxide