ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which functional group is found in all alcohols?

1. ACarbonyl group (C=O) only
2. BHydroxyl group (–OH)
3. CCarboxyl group (–COOH)
4. DAmino group (–NH₂)

What does the law of conservation of mass state?

1. AGases have no mass
2. BMass is neither created nor destroyed in a chemical reaction
3. CMass is lost as heat in every reaction
4. DThe mass of products is always greater than the mass of reactants

What does the rate of a reaction measure?

1. AHow hot the reaction gets
2. BHow much product forms in total by the end
3. CHow quickly reactants are used up or products are formed
4. DHow much energy the final products contain

Which assumption is made about an ideal gas?

1. AIts particles are large, closely packed and strongly attracted
2. BIts particles have no attraction to each other
3. CIts particles stay still at room temperature
4. DIts particles lose energy in every collision

สารละลายที่เตรียมจากเกลือ 15 g และน้ำ 135 g มีเปอร์เซ็นต์เกลือโดยมวลเท่าใด

1. A15%
2. B10%
3. C11%
4. D90%

Which substance is a non-electrolyte when dissolved in water?

1. APotassium chloride
2. BGlucose
3. CSodium chloride
4. DHydrochloric acid

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt falls, because oxygen is an acid
2. BIt falls, because less CO₂ means more H⁺ ions
3. CIt stays exactly 7.40, because CO₂ does not affect pH
4. DIt rises, because less CO₂ means fewer H⁺ ions

จงดุลสมการ __C₃H₈ + __O₂ → __CO₂ + __H₂O สัมประสิทธิ์ของ O₂ คือเท่าใด

1. A3
2. B5
3. C10
4. D4