Alkali metals

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What colour does potassium turn in a combustion reaction

Lilac

What colour does sodium burn in a combustion reaction?

Orange-yellow

What colour does lithium burn in a combustion reaction?

Red

Describe the result of a lithium-water test.

Floats, fizzes steadily and disappears

Describe the result of a sodium-water test.

Melts, forms a ball, floats, fizzes rapidly, disappears

Describe the result of a potassium-water test.

Melts, floats, self-ignites, lilac flame, explodes

What is the product of an alkali-halogen reaction?

White precipitate

Why does the reactivity of group 1 elements increase as you go down the group?

The attraction between the outer electron and the nucleus gets weaker

What colour will calcium turn in a flame test?

Brick red

What will a compound with chlorine ions produce when reacting with silver nitrate?

White precipitate of silver chloride

What will a compound with bromide ions produce when reacting with silver nitrate?

Cream precipitate

What will a compound with iodide ions produce when reacting with silver nitrate?

Yellow precipitate