ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

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

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

1. A16 g/mol
2. B48 g/mol
3. C32 g/mol
4. D8 g/mol

How many electrons are shared in a double covalent bond?

1. A2
2. B6
3. C4
4. D8

What is the molar mass of calcium carbonate, CaCO₃ (Ca = 40, C = 12, O = 16 g/mol)?

1. A84 g/mol
2. B100 g/mol
3. C116 g/mol
4. D68 g/mol

Radioactive iodine (iodine-131) is used to treat some thyroid conditions. Why does it reach the thyroid?

1. ARadiation is always drawn toward the head
2. BThe thyroid gland takes up iodine to make its hormones
3. CIodine is strongly attracted to the metal ions stored in the neck
4. DIodine-131 is not radioactive inside the body

อะตอมแมกนีเซียมสูญเสียอิเล็กตรอนสองตัว ไอออนที่เกิดขึ้นคืออะไร

1. AMg⁻
2. BMg⁺
3. CMg²⁺
4. DMg²⁻

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AElectrons are spread evenly through a positive "pudding"
2. BAtoms are solid, indivisible spheres
3. CElectrons move in fixed circular orbits
4. DAn atom is mostly empty space with a small, dense, positive nucleus

Which phrase best describes a 0.001 M solution of hydrochloric acid?

1. AA dilute solution of a weak acid
2. BA concentrated solution of a weak acid
3. CA concentrated solution of a strong acid
4. DA dilute solution of a strong acid