Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Khí nào chiếm phần lớn không khí của Trái Đất?

1. ACarbon dioxide
2. BOxygen
3. CNitrogen
4. DHydrogen

In a solution, what is the solvent?

1. AThe substance that does the dissolving, usually present in the larger amount
2. BAny solid that will not dissolve, however long it is stirred
3. CThe gas given off when a solid dissolves
4. DThe substance that is dissolved, usually present in the smaller amount

What is the SI unit of pressure?

1. ANewton (N)
2. BPascal (Pa)
3. CLitre (L)
4. DJoule (J)

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. ASalt leaves the cell, which swells
2. BThe cell stays the same size and shape
3. CWater leaves the cell, which shrinks
4. DWater enters the cell, which swells and may burst

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A1
2. B2
3. C0
4. D4

Which type of bond holds the two atoms together in a nitrogen molecule, N₂?

1. AAn ionic bond
2. BA double covalent bond
3. CA single covalent bond
4. DA triple covalent bond

How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?

1. AThe gas turns into a solid at higher temperature
2. BMore gas dissolves, so warm drinks stay fizzy for longer
3. CLess gas dissolves, so warm drinks go flat faster
4. DTemperature has no effect on gas solubility

A mixture contains sand, salt and water. Which sequence separates all three?

1. ADistil first to remove the sand, then filter out the salt
2. BEvaporate all the water first, then filter the salt away from the dry sand
3. CFilter to remove the sand, then distil the filtrate to collect water and leave salt
4. DUse a magnet to remove the salt, then filter the sand