Chemistry for nursing entrance exams worksheet with answers

What is a hydrocarbon?

1. AA carbon atom with a positive charge
2. BA compound made of hydrogen and oxygen
3. CAny compound that dissolves in water
4. DA compound made of only hydrogen and carbon

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

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

What is a cation?

1. AA negatively charged ion
2. BA neutral atom
3. CA molecule with no charge
4. DA positively charged ion

How does a catalyst speed up a reaction?

1. AIt adds extra reactant to the mixture
2. BIt provides a different pathway with a lower activation energy
3. CIt raises the temperature of the reactants so they move faster
4. DIt makes the reaction more exothermic

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AMore product keeps forming as the equilibrium shifts to the right
2. BThe reactants run out immediately
3. CThe reaction rate drops to zero
4. DThe equilibrium shifts to the left to form more reactants

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA carbonyl group and an ester group
2. BA phosphate group and a hydroxyl group
3. CAn amino group and a carboxyl group
4. DA hydroxyl group and a methyl group

Why does food cook faster in a pressure cooker?

1. AThe higher pressure lowers the boiling point
2. BThe higher pressure raises the boiling point, so the water is hotter
3. CPressure itself breaks down the food, regardless of temperature
4. DSteam is trapped, so the water boils at a lower temperature

What is the net ionic equation for the neutralisation of any strong acid by any strong base?

1. ANa⁺ + Cl⁻ → NaCl
2. BH⁺ + OH⁻ → H₂O
3. CH⁺ + Cl⁻ → HCl
4. DH₂ + O₂ → H₂O₂