ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

อนุภาคย่อยของอะตอมชนิดใดพบในนิวเคลียส

1. Aอิเล็กตรอนเท่านั้น
2. Bอิเล็กตรอนและนิวตรอน
3. Cโปรตอนและอิเล็กตรอน
4. Dโปรตอนและนิวตรอน

What is gamma radiation?

1. AA slow-moving electron
2. BHigh-energy electromagnetic radiation with no mass or charge
3. CA fast stream of protons from the nucleus
4. DA stream of helium nuclei with a positive charge

What is a molecule?

1. AA mixture of two different elements
2. BA single atom with a positive charge
3. CTwo or more atoms held together by covalent bonds
4. DThe nucleus of an atom

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

1. A98 g/mol
2. B50 g/mol
3. C96 g/mol
4. D49 g/mol

Which coefficients balance __KClO₃ → __KCl + __O₂?

1. A1, 1, 1
2. B2, 2, 3
3. C2, 1, 3
4. D1, 1, 3

Why does stirring help a solid dissolve faster?

1. AIt increases the amount of solute that can dissolve in total
2. BIt brings fresh solvent into contact with the solid's surface
3. CIt raises the temperature of the solvent by friction a great deal
4. DIt turns the solid into a liquid

An element has the electron arrangement 2, 8, 8, 2. Where is it on the periodic table?

1. AGroup 2, period 4
2. BGroup 8, period 2
3. CGroup 2, period 2
4. DGroup 4, period 2

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AIons and atoms always have exactly the same mass
2. BThe ion gains a neutron that balances the loss
3. CThe ion has one fewer proton, which has a tiny mass
4. DThe only difference is one electron, which has a tiny mass