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What is an electrolyte?

1. AA gas that dissolves in blood
2. BA substance that dissolves as whole molecules without forming any ions
3. CA substance that forms ions and conducts electricity when dissolved in water
4. DA metal that conducts electricity as a solid

In a chemical equation, what are the reactants?

1. AThe numbers written in front of each formula
2. BThe starting substances, written to the left of the arrow
3. CThe catalysts written above the arrow
4. DThe new substances formed, written to the right of the arrow

What is the SI unit of temperature?

1. ADegree Celsius
2. BKelvin
3. CJoule
4. DDegree Fahrenheit

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A5
2. B2
3. C3
4. D6

What colour is phenolphthalein indicator in a basic solution?

1. AYellow
2. BBlue
3. CPink
4. DColourless

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AWater vapour in the air condenses on the cold glass
2. BThe glass releases water when it gets cold
3. CThe ice evaporates through the glass
4. DWater leaks through tiny holes in the glass

Why is gamma radiation used to sterilise sealed medical supplies such as syringes?

1. AIt adds a protective chemical coating to the items
2. BIt is stopped by the packaging, so it only cleans the outside
3. CIt heats the items to very high temperatures, so the microbes are burned away inside the pack
4. DIt passes through the packaging and kills microbes without making the items radioactive

Why does food cook faster in a pressure cooker?

1. AThe higher pressure lowers the boiling point
2. BThe higher pressure raises the boiling point, so the water is hotter
3. CSteam is trapped, so the water boils at a lower temperature
4. DPressure itself breaks down the food, regardless of temperature