Chemistry for nursing entrance exams worksheet with answers

Which particle has almost no mass compared with the others in an atom?

1. AElectron
2. BThe nucleus as a whole
3. CProton
4. DNeutron

What is a dilute solution?

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

According to the kinetic molecular theory, how do gas particles move?

1. AAlways in a single direction, set by the pull of gravity
2. BConstantly, randomly and in straight lines between collisions
3. COnly when heated, and then in neat lines between the walls
4. DSlowly in fixed positions

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. AIt equals the group number
2. B+1
3. C−1
4. D0

What is carbon-14 dating used for?

1. AMeasuring body temperature
2. BEstimating the age of material that was once alive
3. CFinding the exact age of rocks that are billions of years old
4. DDetecting carbon monoxide in a room

How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?

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

Why does salt sprinkled on an icy road help the ice melt?

1. ASalt makes the ice denser so it sinks into the road
2. BSalt reacts with ice and releases a lot of heat
3. CSalt raises the freezing point of water
4. DDissolved salt lowers the freezing point of water

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. BElectrons are spread evenly through a positive "pudding"
3. CAtoms are solid, indivisible spheres
4. DElectrons move in fixed circular orbits