ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the term for anything that has mass and takes up space?

1. AMatter
2. BEnergy
3. CHeat
4. DForce

What is osmosis?

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

What is the half-life of a radioactive isotope?

1. AThe time taken for half of the radioactive atoms in a sample to decay
2. BHalf the time it takes for all the atoms to decay
3. CThe time taken for the mass of a sample to double in size
4. DHalf the number of protons in the nucleus

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A2, 2, 1
2. B1, 2, 1
3. C1, 1, 1
4. D2, 1, 2

Which equation shows a combustion reaction?

1. AC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
2. BCaCO₃ → CaO + CO₂
3. CZn + CuSO₄ → ZnSO₄ + Cu
4. DNaOH + HCl → NaCl + H₂O

At STP (0 °C and 1 atm), what volume does 1 mole of an ideal gas occupy?

1. A6.02 L
2. B273 L
3. C22.4 L
4. D1.0 L

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANa
2. BNaCl
3. CCl₂
4. DNa⁺

2090 J of heat is added to 50 g of water (specific heat 4.18 J/g·°C). By how much does its temperature rise?

1. A41.8 °C
2. B5 °C
3. C10 °C
4. D20 °C