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Which two substances must be present for iron to rust?

1. AOxygen and water
2. BCarbon dioxide and salt
3. CNitrogen and water
4. DHydrogen and oxygen gas only

What is an acid–base indicator?

1. AA device that measures temperature
2. BA gas given off by acids
3. CA substance that changes colour depending on pH
4. DA substance that neutralises every acid

What is a solution?

1. AA mixture that is the same throughout (homogeneous)
2. BA mixture in which particles settle out on standing
3. CA solid that has been melted
4. DA pure compound made of two elements

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA hydroxyl group and a methyl group
2. BA carbonyl group and an ester group
3. CA phosphate group and a hydroxyl group
4. DAn amino group and a carboxyl group

A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?

1. A760 mmHg
2. B600 mmHg
3. C253 mmHg
4. D750 mmHg

Which bond joins amino acids together in a protein?

1. AAn ionic bond
2. BA hydrogen bond
3. CA glycosidic bond
4. DA peptide bond

Gently heating DNA separates its two strands, but each strand stays in one piece. Why?

1. AHeat converts DNA into a protein
2. BEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
3. CThe two strands are joined by ionic bonds that melt first
4. DThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent

A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?

1. A4 L
2. B8 L
3. C16 L
4. D1 L