ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is a molecule?

1. ATwo or more atoms held together by covalent bonds
2. BThe nucleus of an atom
3. CA single atom with a positive charge
4. DA mixture of two different elements

โมลในวิชาเคมีคืออะไร

1. Aปริมาณของสารที่มีอนุภาค 6.02 × 10²³ อนุภาค
2. Bจำนวนโปรตอนในอะตอม
3. Cมวลเป็นกรัมของคาร์บอน-12 หนึ่งอะตอมพอดีตามมาตราส่วน
4. Dปริมาตรหนึ่งลิตรของแก๊สใด ๆ

Where are the transition metals located on the periodic table?

1. AIn group 1 on the far left
2. BAbove the noble gases
3. CIn group 18 on the far right
4. DIn the central block, groups 3 to 12

What is the mass of 0.5 mol of NaCl (molar mass 58.5 g/mol)?

1. A29.25 g
2. B117 g
3. C0.5 g
4. D58.5 g

Why does ice float on liquid water?

1. AIce has a higher mass than the same volume of water
2. BIce is denser than liquid water
3. CIce is less dense than liquid water
4. DIce contains trapped air from the freezer

In the ideal gas law, PV = nRT, what does n stand for?

1. AThe number of moles of gas
2. BThe density of the gas
3. CThe number of molecules of gas
4. DThe number of atoms per molecule

A solution of acetic acid conducts electricity only weakly, while hydrochloric acid of the same concentration conducts strongly. Why?

1. AAcetic acid only partly ionises, so it forms fewer ions
2. BHydrochloric acid contains metal atoms
3. CAcetic acid does not dissolve in water at all
4. DAcetic acid forms more ions than hydrochloric acid does

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