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

Phản ứng A + B → AB thuộc loại phản ứng nào?

1. APhản ứng phân hủy
2. BPhản ứng cháy
3. CPhản ứng thế đơn
4. DPhản ứng hóa hợp (tổng hợp)

What is a solution?

1. AA mixture that is the same throughout (homogeneous)
2. BA solid that has been melted
3. CA pure compound made of two elements
4. DA mixture in which particles settle out on standing

For a given substance, in which state do its particles move fastest?

1. AGas
2. BLiquid
3. CThey move at the same speed in all states
4. DSolid

What is a polymer?

1. AAn ion with more than one charge
2. BA small molecule containing only two atoms of one element
3. CA large molecule built from many repeating smaller units called monomers
4. DA mixture of several different elements

Phần trăm khối lượng muối trong dung dịch pha từ 15 g muối và 135 g nước là bao nhiêu?

1. A90%
2. B10%
3. C15%
4. D11%

Trong phản ứng 2H₂ + O₂ → 2H₂O, từ 3 mol oxygen tạo ra bao nhiêu mol nước?

1. A3 mol
2. B1,5 mol
3. C2 mol
4. D6 mol

Carbon-12 and carbon-14 react in exactly the same way in chemical reactions. Why?

1. AThey have the same mass number
2. BThey have the same number of protons and electrons
3. CThey have the same number of neutrons
4. DCarbon-14 turns into carbon-12 before reacting

Hydrogen is usually placed at the top of group 1. Which statement about hydrogen is correct?

1. AIt has one valence electron like group 1 metals, but it is a nonmetal gas
2. BIt always forms H⁺ ions and never shares electrons
3. CIt has a full outer shell like the noble gases
4. DIt is an alkali metal that is solid at room temperature