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

Chất nào là một base?

1. AGiấm (acetic acid)
2. BSodium hydroxide (NaOH)
3. CNước chanh (citric acid)
4. DHydrochloric acid (HCl)

What does the law of conservation of mass state?

1. AGases have no mass
2. BMass is neither created nor destroyed in a chemical reaction
3. CThe mass of products is always greater than the mass of reactants
4. DMass is lost as heat in every reaction

In a chemical reaction, what is the limiting reactant?

1. AThe catalyst that controls the speed
2. BThe reactant that is left over at the end
3. CThe reactant that runs out first and stops the reaction
4. DThe reactant with the largest mass

Water can act as an acid in some reactions and as a base in others. What is such a substance called?

1. AAmphoteric
2. BIsotonic
3. CNeutral
4. DSaturated

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt stays suspended halfway down
2. BIt sinks
3. CIt dissolves
4. DIt floats

Sản phẩm của sự cháy hoàn toàn một hydrocarbon như methane là gì?

1. ACarbon và khí hydrogen
2. BCarbon monoxide và hydrogen
3. CCarbon dioxide và nước
4. DOxygen và nước

Dãy nào sắp xếp các nguyên tố theo thứ tự bán kính nguyên tử tăng dần?

1. AC, N, O, F
2. BF, O, N, C
3. CO, F, N, C
4. DNa, Mg, Al, Si

Using PV = nRT with R = 0,082 L·atm/(mol·K), how many moles of gas are in 24,6 L at 1 atm and 300 K?

1. A0,5 mol
2. B300 mol
3. C1 mol
4. D2 mol