ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is oxidation, in terms of electrons?

1. ALoss of electrons
2. BGain of electrons
3. CGain of neutrons
4. DLoss of protons

What causes the pressure of a gas in a container?

1. AGas particles colliding with the container walls
2. BGas particles sticking to the walls
3. CGas particles stopping and pushing outward
4. DThe weight of the container pressing on the gas inside

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution that can still dissolve more solute
3. CA solution that holds the maximum possible solute
4. DA solution with undissolved solid at the bottom

Which reacts more vigorously with water, potassium or sodium?

1. ASodium, because its outer electron is farther from the nucleus
2. BSodium, because it has fewer electron shells to shield its electron
3. CThey react equally, because both are in group 1
4. DPotassium, because its outer electron is farther from the nucleus

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AIt depends on the temperature
2. BThey are the same size
3. CThe sodium ion
4. DThe sodium atom

Using significant figures, what is 2.5 cm × 3.42 cm?

1. A8.550 cm²
2. B9 cm²
3. C8.55 cm²
4. D8.6 cm²

สารหนึ่งหลอมเหลวที่ 801 °C ไม่นำไฟฟ้าเมื่อเป็นของแข็ง แต่นำไฟฟ้าเมื่อหลอมเหลว สารนี้น่าจะเป็นสารชนิดใด

1. Aโลหะ
2. Bสารประกอบไอออนิก
3. Cสารโคเวเลนต์โมเลกุลอย่างง่าย
4. Dแก๊สมีตระกูล

What is (8 × 10⁶) ÷ (2 × 10⁻²)?

1. A4 × 10⁴
2. B16 × 10⁴
3. C4 × 10⁸
4. D4 × 10⁻¹²