ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Between which kinds of elements do covalent bonds usually form?

1. ATwo group 1 metals
2. BA metal and a nonmetal
3. CTwo nonmetals
4. DA metal and a noble gas

Carbon has an atomic mass of 12. What is the mass of 1 mole of carbon atoms?

1. A24 g
2. B12 g
3. C1 g
4. D6 g

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. AOxygen
2. BIron
3. CSodium
4. DHelium

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt rises, so air flows in
2. BIt falls, so air flows out
3. CIt falls, so air flows in
4. DIt does not change

What is the oxidation number of oxygen in most of its compounds?

1. A−1
2. B−2
3. C+2
4. D0

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIt has a higher boiling point than water
2. BIts intermolecular forces are weaker than water's
3. CIts molecules are heavier than water molecules
4. DIts intermolecular forces are stronger than water's

Alkanes follow the general formula CₙH₂ₙ₊₂. What is the formula of the alkane with 4 carbon atoms?

1. AC₄H₈
2. BC₄H₁₀
3. CC₄H₁₂
4. DC₄H₆

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. BAn atom is mostly empty space with a small, dense, positive nucleus
3. CElectrons move in fixed circular orbits
4. DAtoms are solid, indivisible spheres