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What are the usual units of molar mass?

1. Amol/L
2. Bmol/g
3. Cg/mol
4. Dg/L

Between which kinds of elements do covalent bonds usually form?

1. AA metal and a noble gas
2. BTwo group 1 metals
3. CTwo nonmetals
4. DA metal and a nonmetal

Which mixture is a suspension?

1. ASalt dissolved in water
2. BOxygen dissolved in water
3. CSand stirred into water
4. DSugar dissolved in water

Which substance is a non-electrolyte when dissolved in water?

1. ASodium chloride
2. BGlucose
3. CHydrochloric acid
4. DPotassium chloride

Why does stirring help a solid dissolve faster?

1. AIt increases the amount of solute that can dissolve in total
2. BIt brings fresh solvent into contact with the solid's surface
3. CIt raises the temperature of the solvent by friction a great deal
4. DIt turns the solid into a liquid

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AA weak base in it neutralises some of the acid
2. BIt coats the stomach and stops all acid production
3. CIt turns the acid into a gas that is absorbed
4. DAn acid in it lowers the stomach pH further

Which 1-litre solution lowers the freezing point of water the most?

1. A1 M CaCl₂
2. B0,5 M NaCl
3. C1 M glucose
4. D1 M NaCl

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ASand, because it has a lower specific heat capacity than water
2. BBoth warm equally, because they absorbed the same heat
3. CWater, because it has a higher specific heat capacity than sand
4. DSand, because it has a higher specific heat capacity than water