ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A8 g/mol
2. B16 g/mol
3. C48 g/mol
4. D32 g/mol

Which method separates sand from water?

1. AChromatography
2. BDistillation
3. CFiltration
4. DEvaporation of the sand

Which property is typical of nonmetals?

1. AThey are all solids at room temperature
2. BThey are poor conductors of heat and electricity
3. CThey are shiny and easily bent into wires
4. DThey easily lose electrons to form positive ions

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

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

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A5%
2. B75%
3. C25%
4. D133%

What is the molar mass of sulfuric acid, H₂SO₄ (H = 1, S = 32, O = 16 g/mol)?

1. A96 g/mol
2. B98 g/mol
3. C50 g/mol
4. D49 g/mol

J.J. Thomson's cathode ray experiments led to which discovery?

1. AThe nucleus contains uncharged neutrons
2. BElectrons occupy fixed energy levels
3. CAtoms have a dense, positively charged nucleus
4. DAtoms contain small, negatively charged particles

โลหะทำปฏิกิริยากับกรดและมีแก๊สเกิดขึ้นซึ่งเผาไหม้ด้วยเสียงป๊อบ แก๊สนั้นคืออะไร

1. Aออกซิเจน
2. Bไนโตรเจน
3. Cคาร์บอนไดออกไซด์
4. Dไฮโดรเจน