Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

How is percent yield calculated?

1. A(Actual yield ÷ theoretical yield) × 100
2. B(Mass of reactants ÷ mass of products) × 100
3. CActual yield − theoretical yield
4. D(Theoretical yield ÷ actual yield) × 100

What is a molecule?

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

What kind of carbon–carbon bonds do alkanes contain?

1. AAt least one triple bond
2. BOnly single bonds
3. CIonic bonds
4. DAt least one double bond

According to the Brønsted–Lowry definition, what is an acid?

1. AA proton (H⁺) donor
2. BA hydroxide ion donor
3. CAn electron pair donor
4. DA proton (H⁺) acceptor

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThey are the same size
2. BThe sodium ion
3. CIt depends on the temperature
4. DThe sodium atom

88 g carbon dioxide (khối lượng mol 44 g/mol) có bao nhiêu mol?

1. A44 mol
2. B0,5 mol
3. C2 mol
4. D3872 mol

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. ASand, because it has a lower specific heat capacity than water
2. BWater, because it has a higher specific heat capacity than sand
3. CBoth warm equally, because they absorbed the same heat
4. DSand, because it has a higher specific heat capacity than water

When water boils, what is overcome?

1. AThe ionic bonds between H⁺ and O²⁻
2. BThe forces holding the oxygen nucleus together
3. CThe covalent O–H bonds inside each molecule
4. DHydrogen bonds between water molecules