Chemistry for nursing entrance exams worksheet with answers

What is an ion?

1. AAn atom that has extra neutrons in its nucleus compared with other atoms
2. BA molecule made of two identical atoms
3. CA particle without any electrons
4. DAn atom or group of atoms with an electrical charge

In a chemical equation, what are the reactants?

1. AThe numbers written in front of each formula
2. BThe new substances formed, written to the right of the arrow
3. CThe starting substances, written to the left of the arrow
4. DThe catalysts written above the arrow

In a salt solution, what is the salt called?

1. AThe precipitate
2. BThe solvent
3. CThe solute
4. DThe catalyst

What is the mass of 0.5 mol of NaCl (molar mass 58.5 g/mol)?

1. A58.5 g
2. B0.5 g
3. C29.25 g
4. D117 g

Which list is in order from smallest to largest mass?

1. AKilogram, gram, milligram
2. BMilligram, gram, kilogram
3. CMilligram, kilogram, gram
4. DGram, milligram, kilogram

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A4
2. B2
3. C0
4. D1

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. ABoth gases diffuse at the same speed
2. BThe lighter NH₃ molecules diffuse faster than HCl molecules
3. CThe HCl molecules diffuse faster than NH₃ molecules
4. DThe white ring forms where the gases are heaviest

What volume of a 6 M stock solution is needed to make 300 mL of a 2 M solution?

1. A50 mL
2. B900 mL
3. C150 mL
4. D100 mL