ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which property is typical of bases?

1. AThey turn blue litmus red
2. BThey have a pH below 7
3. CThey feel slippery
4. DThey taste sour

What is activation energy?

1. AThe energy stored in the products
2. BThe minimum energy reacting particles need for a reaction to happen
3. CThe total energy released once the reaction has finished
4. DThe energy needed to melt a solid

What is the change from a gas to a liquid called?

1. ACondensation
2. BEvaporation
3. CSublimation
4. DFreezing

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

1. AThe sodium atom
2. BThe sodium ion
3. CThey are the same size
4. DIt depends on the temperature

What is the name of the compound CaCO₃?

1. ACalcium oxide
2. BCarbon calcium trioxide
3. CCalcium carbonate
4. DCalcium carbide

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AAn amino group and a carboxyl group
2. BA hydroxyl group and a methyl group
3. CA phosphate group and a hydroxyl group
4. DA carbonyl group and an ester group

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

Which approach best reduces a health worker's exposure to ionising radiation?

1. AWork faster without any shielding
2. BStand closer to the source so the job is finished sooner and exposure is shorter
3. CRely only on wearing gloves
4. DLimit the time near the source, increase the distance and use shielding