ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which unit is commonly used for the density of a liquid?

1. Ag·mL
2. BmL/g
3. Ckg
4. Dg/mL

ที่ระดับน้ำทะเล น้ำบริสุทธิ์เดือดที่อุณหภูมิเท่าใด

1. A50 °C (122 °F)
2. B100 °C (212 °F)
3. C37 °C (98.6 °F)
4. D0 °C (32 °F)

What is osmosis?

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

When diluting a concentrated acid, which method is safe?

1. AAdd the water quickly to the acid
2. BAdd the water slowly to the acid
3. CMix them in any order, as long as it is fast
4. DAdd the acid slowly to the water

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe equilibrium shifts to the left, toward N₂ and H₂
2. BThere is no effect on the equilibrium
3. CThe equilibrium shifts to the right, toward NH₃
4. DThe NH₃ breaks down completely

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. AThe thyroid gland takes up iodine to make its hormones
2. BIodine is strongly attracted to the metal ions stored in the neck
3. CRadiation is always drawn toward the head
4. DIodine-131 is not radioactive inside the body

Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?

1. A88 g
2. B16 g
3. C22 g
4. D44 g

Carbon-14 (atomic number 6) decays by emitting a beta particle. What does it become?

1. ANitrogen-14
2. BNitrogen-15
3. CBoron-14
4. DCarbon-13