Year 9 - 100 questions

What to use for drawing the baseline onto a chromatogram and why.

• Pencil; graphite is insoluble so won’t run up the paper and may interfere with the results.

• Ink pen; it provides a clear line and is easy to read.

• Marker; it dries quickly and is visible on the chromatogram.

• Charcoal; it is easy to erase and won't affect the results.

Give the colour of iodine at room temperature

• Purple

• Yellow

• Grey

• Brown

Lowest and highest possible values for any Rf value.

• 0.00 and 1.00

• 0.10 and 0.90

• 0.20 and 0.80

• 0.30 and 0.70

Change of state from solid to liquid

• Melting

• Freezing

• Condensation

• Sublimation

Element that burns in air to form an oxide which dissolves in water to give an acidic solution.

• A metal

• A non-metal

• A noble gas

• A metalloid

Common name for group 7 elements in the periodic table.

• Noble Gases

• Alkali Metals

• Halogens

• Transition Metals

Give the colour of the element chlorine

• Red

• Blue

• Green

• Yellow

Difference between a spot that travels a bigger distance up the paper and one which only moves a short distance in chromatography.

• The spot which travels further up the paper is more soluble in the solvent being used.

• The spot that moves a shorter distance is more soluble in the solvent.

• Both spots have the same solubility in the solvent.

• The distance traveled has no relation to solubility.

Give the chemical name for rust

• Hydrated Iron (III) Oxide

• Iron (II) Oxide

• Iron (III) Sulfide

• Iron Oxide

Arrangement of elements in the periodic table.

• Order of increasing atomic number

• Order of decreasing atomic mass

• Random arrangement of elements

• Arrangement based on color