ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What colour does blue litmus paper turn in an acid?

1. APurple
2. BRed
3. CGreen
4. DBlue (no change)

What is the SI base unit of mass?

1. AGram
2. BKilogram
3. CPound
4. DNewton

What is the chemical formula of carbon dioxide?

1. ACO₃
2. BCO₂
3. CC₂O
4. DCO

Which measurement has three significant figures?

1. A5.0006
2. B56
3. C0.0056
4. D0.00560

How many moles of gas are in 44.8 L at STP (0 °C and 1 atm)?

1. A22.4 mol
2. B44.8 mol
3. C0.5 mol
4. D2 mol

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe molecules become heavier and press harder on the surface
2. BThe liquid's volume decreases and squeezes out vapour
3. CMore molecules have enough energy to escape into the gas phase
4. DThe attractions between the molecules become stronger

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AThe air in the lungs expands as the outside pressure falls
2. BThe air in the lungs shrinks as the outside pressure falls
3. COxygen turns to liquid at the surface
4. DThe water gets warmer near the surface

สารละลายมีความเข้มข้นของไฮโดรเจนไอออน 1 × 10⁻⁹ mol/L มี pH เท่าใด และเป็นกรดหรือเบส

1. ApH 5 เป็นกรด
2. BpH −9 เป็นกรด
3. CpH 9 เป็นกรด
4. DpH 9 เป็นเบส