Identification of Species (PAG C5) Flashcards

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In this PAG, what does the word 'species' mean in chemistry?

It means a type of chemical, such as an atom, ion or molecule.

How do you test for hydrogen gas in the lab?

Put a lit splint at the mouth of the test tube; hydrogen burns with a squeaky pop.

How do you test for oxygen gas?

Put a glowing splint into the gas; oxygen relights the glowing splint.

How do you test for carbon dioxide gas?

Bubble the gas through limewater; carbon dioxide turns the limewater cloudy or milky.

How do you test for chlorine gas safely?

Hold damp blue litmus paper in the gas; chlorine turns it red and then bleaches it white.

What simple test shows that an ion is a carbonate?

Add a dilute acid; a carbonate fizzes and gives off carbon dioxide gas.

What result shows that a solution contains sulfate ions when you add barium chloride solution?

A white precipitate of barium sulfate forms if sulfate ions are present.

How can you test for chloride ions using silver nitrate solution?

Add a few drops of silver nitrate solution; a white precipitate of silver chloride shows chloride ions are present.

What is a flame test used for?

It is used to find which metal ion is in a compound by the colour it makes in a flame.

What flame colour does a sodium ion give in a flame test?

Sodium ions give a yellow or orange-yellow flame.

What flame colour does a potassium ion give in a flame test?

Potassium ions give a lilac or light purple flame.

Why is it important to clean the wire between flame tests?

To remove chemicals from the last test so they do not change the next flame colour.