Chemistry for nursing entrance exams worksheet with answers

What are the units of molarity?

1. AMoles of solute per kilogram of the solvent used
2. BGrams of solute per litre of solution (g/L)
3. CGrams of solute per 100 g of solution
4. DMoles of solute per litre of solution (mol/L)

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe rate decreases
2. BThe reaction stops
3. CThe rate stays the same
4. DThe rate increases

A blown-up balloon is put in a freezer. What happens to its volume?

1. AThe balloon bursts
2. BIt increases
3. CIt decreases
4. DIt stays exactly the same

In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?

1. A50 g
2. B15 g
3. C5 g
4. D10 g

Which change would make a piece of chalk react faster with acid?

1. ACooling the acid in a fridge
2. BDiluting the acid with more water
3. CGrinding the chalk into a powder
4. DUsing one large lump of chalk

What colour is phenolphthalein indicator in a basic solution?

1. AYellow
2. BPink
3. CColourless
4. DBlue

Each C=O bond in carbon dioxide is polar, yet the CO₂ molecule is nonpolar. Why?

1. AThe molecule is linear, so the two bond dipoles cancel out
2. BThe bonds are ionic, not covalent
3. CCarbon has lone pairs that cancel the dipoles
4. DCarbon and oxygen have the same electronegativity

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A14
2. B11
3. C3
4. D7