ورقة عمل الكيمياء لامتحانات القبول في التمريض مع الإجابات

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

What is the SI base unit of mass?

1. ANewton
2. BGram
3. CKilogram
4. DPound

What is a hydrocarbon?

1. AA compound made of only hydrogen and carbon
2. BAny compound that dissolves in water
3. CA compound made of hydrogen and oxygen
4. DA carbon atom with a positive charge

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMg₂O₂
2. BMg₂O
3. CMgO₂
4. DMgO

How many molecules are in 2 mol of carbon dioxide?

1. A1,20 × 10²⁴
2. B3,01 × 10²³
3. C2,00 × 10²³
4. D6,02 × 10²³

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AAn acid in it lowers the stomach pH further
2. BA weak base in it neutralises some of the acid
3. CIt turns the acid into a gas that is absorbed
4. DIt coats the stomach and stops all acid production

A small amount of acid is spilled on a lab bench. Why is a weak base such as sodium bicarbonate preferred over strong NaOH to neutralise it?

1. AExcess sodium bicarbonate is far less harmful than excess NaOH
2. BSodium bicarbonate makes the spilled acid evaporate
3. CSodium bicarbonate is a strong acid that cancels the spill
4. DNaOH does not react with acids at room temperature

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A3
2. B14
3. C11
4. D7