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

Which positive ion is found in the highest concentration inside most body cells?

1. AMagnesium (Mg²⁺)
2. BPotassium (K⁺)
3. CCalcium (Ca²⁺)
4. DSodium (Na⁺)

How is percent yield calculated?

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

What is the name for the attraction of water molecules to each other?

1. ADiffusion
2. BOsmosis
3. CCohesion
4. DAdhesion

Скільки валентних (зовнішніх) електронів має атом кисню?

1. A16
2. B8
3. C6
4. D2

Using significant figures, what is 2,5 cm × 3,42 cm?

1. A8,6 cm²
2. B8,550 cm²
3. C8,55 cm²
4. D9 cm²

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. AHydrolysis (splitting with water)
2. BCondensation (dehydration synthesis)
3. CCombustion
4. DNeutralisation

Samples of hydrogen gas (H₂) and oxygen gas (O₂) are at the same temperature. Which statement is correct?

1. AThey have the same average kinetic energy, but H₂ molecules move faster
2. BH₂ molecules have more kinetic energy and move faster
3. CBoth move at the same average speed
4. DO₂ molecules move faster because they are heavier

Why does food cook faster in a pressure cooker?

1. AThe higher pressure raises the boiling point, so the water is hotter
2. BSteam is trapped, so the water boils at a lower temperature
3. CThe higher pressure lowers the boiling point
4. DPressure itself breaks down the food, regardless of temperature