ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

ปฏิกิริยา AB → A + B เป็นปฏิกิริยาชนิดใด

1. Aการสะเทิน
2. Bการสลายตัว
3. Cการแทนที่คู่
4. Dการสังเคราะห์

What is radioactivity?

1. AThe glow produced by any hot object
2. BThe release of heat and light when fuels burn in air
3. CThe flow of electrons through a metal wire
4. DThe release of radiation by unstable atomic nuclei

What is osmosis?

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

Normal saline (0.9% NaCl) is used for IV fluids. How is it described compared with blood?

1. AHypotonic
2. BSaturated
3. CIsotonic
4. DHypertonic

Why do group 1 metals such as sodium react so easily?

1. AThey easily gain one extra electron
2. BTheir nuclei contain no neutrons
3. CThey have one outer electron that is easily lost
4. DThey have a full outer shell of electrons

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. ACu
2. BZn
3. CZn²⁺
4. DCu²⁺

Glucose (C₆H₁₂O₆) and fructose (C₆H₁₂O₆) join by a condensation reaction to form sucrose. What is the formula of sucrose?

1. AC₁₂H₂₄O₁₂
2. BC₆H₁₂O₆
3. CC₁₂H₂₂O₁₁
4. DC₁₂H₂₀O₁₀

Why does food cook faster in a pressure cooker?

1. AThe higher pressure lowers the boiling point
2. BPressure itself breaks down the food, regardless of temperature
3. CSteam is trapped, so the water boils at a lower temperature
4. DThe higher pressure raises the boiling point, so the water is hotter