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What does the subscript 2 in H₂O tell you?

1. AEach molecule contains two oxygen atoms
2. BEach molecule contains two hydrogen atoms
3. CThere are two water molecules
4. DWater has a charge of 2

What is the SI unit of temperature?

1. AKelvin
2. BJoule
3. CDegree Fahrenheit
4. DDegree Celsius

Which form of sugar dissolves fastest in a cup of tea?

1. AA large lump of rock sugar
2. BA sugar cube
3. CGranulated sugar
4. DAll forms dissolve at the same rate

A radioactive isotope has a half-life of 5 days. A sample starts with 80 g. How much is left after 10 days?

1. A10 g
2. B0 g
3. C20 g
4. D40 g

Which element has chemical properties most similar to calcium?

1. APotassium
2. BScandium
3. CCarbon
4. DMagnesium

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4,18 J/g·°C)?

1. A41,8 J
2. B41,800 J
3. C418 J
4. D4180 J

In terms of bonds, why is a reaction exothermic?

1. ANo bonds are broken in exothermic reactions
2. BMore energy is absorbed breaking old bonds than is released forming new ones
3. CForming bonds always absorbs energy
4. DMore energy is released forming new bonds than is absorbed breaking old ones

J.J. Thomson's cathode ray experiments led to which discovery?

1. AThe nucleus contains uncharged neutrons
2. BElectrons occupy fixed energy levels
3. CAtoms contain small, negatively charged particles
4. DAtoms have a dense, positively charged nucleus