ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is osmosis?

1. AThe movement of solute particles against a gradient using energy
2. BThe movement of water across a semipermeable membrane
3. CThe dissolving of a gas in a liquid
4. DThe breaking of a solid into ions

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ACondensation
2. BDeposition
3. CSublimation
4. DFreezing

In a chemical equation, what does the symbol (aq) after a formula mean?

1. ADissolved in water
2. BA solid
3. CA gas
4. DA pure liquid

A piece of metal has a density of 8 g/cm³ and a volume of 5 cm³. What is its mass?

1. A0.625 g
2. B40 g
3. C1.6 g
4. D13 g

How is 0.00045 written in scientific notation?

1. A4.5 × 10⁻⁴
2. B4.5 × 10⁻³
3. C4.5 × 10⁴
4. D4.5 × 10⁻⁵

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures slow down chemical and microbial reactions
2. BLower temperatures raise the activation energy of every reaction
3. CCold air contains no oxygen
4. DCold temperatures add preservatives to the food

จงดุลสมการ __C₃H₈ + __O₂ → __CO₂ + __H₂O สัมประสิทธิ์ของ O₂ คือเท่าใด

1. A10
2. B5
3. C3
4. D4

A compound is 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass (C = 12, H = 1, O = 16). What is its empirical formula?

1. ACH₄O
2. BCH₂O
3. CCHO
4. DC₂HO