Chemistry for nursing entrance exams worksheet with answers

Where do the mole ratios used in stoichiometry come from?

1. AThe coefficients of the balanced equation
2. BThe physical states of the substances
3. CThe subscripts in each formula
4. DThe molar masses of the reactants

What is the chemical formula of water?

1. AH₂O₂
2. BHO₂
3. COH
4. DH₂O

In the reaction A + B → AB, which kind of reaction is shown?

1. ACombustion
2. BSynthesis (combination)
3. CSingle replacement
4. DDecomposition

What is the electron arrangement of a sodium atom (11 electrons)?

1. A8, 2, 1
2. B2, 9
3. C2, 8, 2
4. D2, 8, 1

Which statement describes an endothermic process?

1. AIt releases heat, so the surroundings feel warmer
2. BIt happens only at very high temperatures
3. CIt neither absorbs nor releases any energy
4. DIt absorbs heat, so the surroundings feel colder

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 is endothermic
4. DThe reaction needs a catalyst

In 2H₂ + O₂ → 2H₂O, 4 g of hydrogen (molar mass 2 g/mol) reacts with plenty of oxygen. What mass of water forms (molar mass 18 g/mol)?

1. A72 g
2. B36 g
3. C18 g
4. D4 g

The true volume in a flask is 10.0 mL. A student measures it three times and gets 8.1 mL, 8.1 mL and 8.2 mL. How are these results best described?

1. ANeither accurate nor precise
2. BAccurate but not precise
3. CBoth accurate and precise
4. DPrecise but not accurate