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

What is absolute zero?

1. A0 K, about −273 °C, the lowest possible temperature
2. B0 °F, the temperature of a salt and ice mixture
3. C0 °C, the point at which pure water freezes into ice
4. D−100 °C, the coldest temperature on Earth

According to collision theory, what must happen for particles to react?

1. AThey must both be in the solid state at the same time
2. BThey must stay completely still next to each other
3. CThey must have the same mass
4. DThey must collide with enough energy and the right orientation

What are the usual units of molar mass?

1. Ag/L
2. Bg/mol
3. Cmol/g
4. Dmol/L

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 can change the shape of enzymes so they stop working
3. CHigh temperatures turn enzymes into fats
4. DHigh temperatures remove the water from blood

Khối lượng riêng của một vật có khối lượng 50 g và thể tích 20 cm³ là bao nhiêu?

1. A1000 g/cm³
2. B0,4 g/cm³
3. C70 g/cm³
4. D2,5 g/cm³

How many covalent bonds does a carbon atom usually form?

1. A2
2. B1
3. C3
4. D4

How many grams of NaCl are in 250 mL of 0,9% (w/v) normal saline?

1. A9 g
2. B0,9 g
3. C22,5 g
4. D2,25 g

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