Chemistry for nursing entrance exams worksheet with answers

What is the melting point of a substance?

1. AThe temperature at which its solid turns into a liquid
2. BThe temperature at which its liquid turns into a gas
3. CThe temperature at which it catches fire
4. DThe temperature at which it dissolves in water

Which method separates sand from water?

1. AFiltration
2. BChromatography
3. CEvaporation of the sand
4. DDistillation

Which of these is a chemical property?

1. AColour
2. BDensity
3. CFlammability
4. DBoiling point

When a gas is heated in a rigid, sealed container, what happens to its pressure?

1. AIt stays the same
2. BIt decreases
3. CIt drops to zero
4. DIt increases

Why does stirring help a solid dissolve faster?

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

What are the products of the complete combustion of a hydrocarbon such as methane?

1. ACarbon monoxide and hydrogen
2. BOxygen and water
3. CCarbon and hydrogen gas
4. DCarbon dioxide and water

In 2H₂ + O₂ → 2H₂O, 4 g of hydrogen (molar mass 2 g/mol) reacts with plenty of oxygen. What mass of water forms (molar mass 18 g/mol)?

1. A4 g
2. B72 g
3. C18 g
4. D36 g

Hydrogen peroxide fizzes when poured on a cut because an enzyme in blood breaks it down. What gas is produced, and what type of reaction is it?

1. ACarbon dioxide, in a combustion reaction
2. BHydrogen, in a single replacement reaction
3. COxygen, in a decomposition reaction
4. DChlorine, in a synthesis reaction