ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Standard atmospheric pressure (1 atm) is equal to how many millimetres of mercury?

1. A760 mmHg
2. B100 mmHg
3. C1000 mmHg
4. D120 mmHg

A food Calorie (written with a capital C) equals which amount of energy?

1. A1 calorie
2. B1 kilojoule (1000 J)
3. C1 joule
4. D1 kilocalorie

Which group contains the alkaline earth metals, such as magnesium and calcium?

1. AGroup 17
2. BGroup 2
3. CGroup 1
4. DGroup 18

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 36 g dissolves and about 14 g stays undissolved
2. BAbout 14 g dissolves and about 36 g stays undissolved
3. CNone of the salt dissolves
4. DAll 50 g dissolves

What is the oxidation number of oxygen in most of its compounds?

1. A−1
2. B0
3. C+2
4. D−2

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe temperature
2. BThe volume of acid, which is kept the same
3. CThe reaction rate
4. DThe type of beaker used

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AOxygen turns to liquid at the surface
2. BThe air in the lungs shrinks as the outside pressure falls
3. CThe air in the lungs expands as the outside pressure falls
4. DThe water gets warmer near the surface

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. CNaOH does not react with acids at room temperature
4. DSodium bicarbonate is a strong acid that cancels the spill