Chemistry for nursing entrance exams worksheet with answers

What does organic chemistry study?

1. ACompounds based on carbon
2. BCompounds made of metals
3. COnly the noble gases
4. DOnly compounds found in plants

Which is a sign that a chemical reaction may have taken place?

1. ASugar dissolves completely when stirred into water
2. BWater freezes into ice when put in a freezer
3. CA block of wax melts when it is heated
4. DA gas is produced when two liquids are mixed

How is percent yield calculated?

1. AActual yield − theoretical yield
2. B(Mass of reactants ÷ mass of products) × 100
3. C(Actual yield ÷ theoretical yield) × 100
4. D(Theoretical yield ÷ actual yield) × 100

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

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

Why must temperatures be in kelvin in gas law calculations?

1. AGas volume and pressure are proportional to the absolute temperature
2. BThe kelvin scale has smaller degrees, which gives more precise answers
3. CCelsius can only be used for liquids
4. DKelvin values are always below 100

What is the formula of sodium sulfate, made from Na⁺ and SO₄²⁻ ions?

1. ANaSO₄
2. BNa₄SO₂
3. CNa(SO₄)₂
4. DNa₂SO₄

Which of these is a redox reaction?

1. ACaCO₃ → CaO + CO₂
2. BZn + CuSO₄ → ZnSO₄ + Cu
3. CAgNO₃ + NaCl → AgCl + NaNO₃
4. DNaOH + HCl → NaCl + H₂O

Haemoglobin binds oxygen reversibly: Hb + O₂ ⇌ HbO₂. How does this equilibrium help deliver oxygen to tissues?

1. ALow O₂ in tissues shifts it to the left, releasing oxygen
2. BThe equilibrium does not change anywhere in the body
3. CLow O₂ in tissues shifts it to the right, releasing oxygen
4. DHigh O₂ in tissues shifts it to the left, absorbing oxygen