Chemistry for nursing entrance exams worksheet with answers

Which substance is a base?

1. ALemon juice (citric acid)
2. BVinegar (acetic acid)
3. CSodium hydroxide (NaOH)
4. DHydrochloric acid (HCl)

Which process is exothermic (releases heat)?

1. AMelting a block of ice
2. BBurning methane gas
3. CPhotosynthesis
4. DEvaporating water

What is an electrolyte?

1. AA substance that forms ions and conducts electricity when dissolved in water
2. BA substance that dissolves as whole molecules without forming any ions
3. CA gas that dissolves in blood
4. DA metal that conducts electricity as a solid

Why does oxygen move from the alveoli of the lungs into the blood?

1. AOxygen is heavier than carbon dioxide
2. BThe partial pressure of oxygen is higher in the blood than in the alveoli
3. CThe partial pressure of oxygen is higher in the alveoli than in the blood
4. DOxygen is pumped actively into the blood

How does atomic radius change going down a group?

1. AIt decreases
2. BIt decreases, then increases
3. CIt increases
4. DIt stays the same

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe volume of acid, which is kept the same
2. BThe temperature
3. CThe reaction rate
4. DThe type of beaker used

Two isotopes of the same element differ in which property?

1. AChemical reactions they take part in
2. BMass number
3. CNumber of electrons in the neutral atom
4. DAtomic number

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

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