Chemistry for nursing entrance exams worksheet with answers

Which method separates sand from water?

1. AEvaporation of the sand
2. BFiltration
3. CDistillation
4. DChromatography

What does the prefix "milli-" mean?

1. AOne-hundredth (10⁻²)
2. BOne-thousandth (10⁻³)
3. COne-millionth (10⁻⁶)
4. DOne thousand (10³)

Which property is typical of metals?

1. AThey are poor conductors of heat
2. BMost of them are gases at room temperature
3. CThey are brittle solids that shatter
4. DThey conduct electricity well

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A0.5 g
2. B5 g
3. C500 g
4. D50 g

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMgO₂
2. BMg₂O₂
3. CMgO
4. DMg₂O

Which assumption is made about an ideal gas?

1. AIts particles lose energy in every collision
2. BIts particles have no attraction to each other
3. CIts particles stay still at room temperature
4. DIts particles are large, closely packed and strongly attracted

Sugar is heated in a pan. Which observation shows that a chemical change, not just a physical change, has happened?

1. AThe crystals become smaller when crushed
2. BIt melts into a clear, runny liquid that sets again when it cools
3. CIt turns black and gives off water vapour, leaving a solid that is no longer sweet
4. DIt gets hot to the touch

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AAn atom is mostly empty space with a small, dense, positive nucleus
2. BAtoms are solid, indivisible spheres
3. CElectrons move in fixed circular orbits
4. DElectrons are spread evenly through a positive "pudding"