Chemistry for nursing entrance exams worksheet with answers

Which positive ion is found in the highest concentration inside most body cells?

1. APotassium (K⁺)
2. BCalcium (Ca²⁺)
3. CMagnesium (Mg²⁺)
4. DSodium (Na⁺)

What does a catalyst do?

1. AIt speeds up a reaction without being used up
2. BIt slows down a reaction and is used up
3. CIt provides the reactants for a reaction
4. DIt changes the products of a reaction

What is a dilute solution?

1. AOne with a small amount of solute in a lot of solvent
2. BOne in which the solute has reacted with the solvent
3. COne with no solvent at all
4. DOne with a large amount of solute in a little solvent

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction is exothermic
2. BThe reaction is at equilibrium
3. CThe reaction needs a catalyst
4. DThe reaction is endothermic

How many moles are in 88 g of carbon dioxide (molar mass 44 g/mol)?

1. A2 mol
2. B3872 mol
3. C0.5 mol
4. D44 mol

What is the percent by mass of salt in a solution made from 15 g of salt and 135 g of water?

1. A90%
2. B15%
3. C11%
4. D10%

A gas occupies 4 L at 2 atm and 200 K. What is its volume at 1 atm and 400 K?

1. A1 L
2. B8 L
3. C4 L
4. D16 L

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. ANH₃
2. BOH⁻
3. CNH₄⁺ only
4. DH₂O