Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

Which of these is a polyatomic ion?

1. ASodium, Na⁺
2. BOxide, O²⁻
3. CChloride, Cl⁻
4. DSulfate, SO₄²⁻

Яка група містить благородні гази, як-от гелій і неон?

1. AГрупа 1
2. BГрупа 17
3. CГрупа 2
4. DГрупа 18

What causes the pressure of a gas in a container?

1. AThe weight of the container pressing on the gas inside
2. BGas particles sticking to the walls
3. CGas particles stopping and pushing outward
4. DGas particles colliding with the container walls

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction is endothermic
2. BThe reaction is exothermic
3. CThe reaction needs a catalyst
4. DThe reaction is at equilibrium

Why can a very high fever disrupt the body's chemical reactions?

1. AHigh temperatures make every enzyme work faster without any limit
2. BHigh temperatures turn enzymes into fats
3. CHigh temperatures can change the shape of enzymes so they stop working
4. DHigh temperatures remove the water from blood

Який заряд хлорид-йона?

1. A+7
2. B−1
3. C−2
4. D+1

How much water must be added to 50 mL of a 10% solution to make a 2% solution?

1. A200 mL
2. B40 mL
3. C250 mL
4. D100 mL

Which approach best reduces a health worker's exposure to ionising radiation?

1. AStand closer to the source so the job is finished sooner and exposure is shorter
2. BRely only on wearing gloves
3. CLimit the time near the source, increase the distance and use shielding
4. DWork faster without any shielding