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

What is a solution?

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

What is radioactivity?

1. AThe release of heat and light when fuels burn in air
2. BThe release of radiation by unstable atomic nuclei
3. CThe glow produced by any hot object
4. DThe flow of electrons through a metal wire

Which element makes up the largest share of the human body by mass?

1. AHydrogen
2. BNitrogen
3. COxygen
4. DCarbon

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BMass number rises by 1 and atomic number stays the same
3. CBoth fall by 1
4. DMass number falls by 4 and atomic number falls by 2

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

1. A2 mol
2. B3872 mol
3. C44 mol
4. D0,5 mol

Zn + 2HCl → ZnCl₂ + H₂ là loại phản ứng nào?

1. APhản ứng phân hủy
2. BPhản ứng thế đơn
3. CPhản ứng hóa hợp
4. DPhản ứng trao đổi kép

Vitamin C is water-soluble and vitamin D is fat-soluble. What does this suggest about their molecules?

1. AVitamin C is nonpolar, while vitamin D is strongly polar
2. BBoth are ionic compounds
3. CVitamin C is polar, while vitamin D is mostly nonpolar
4. DBoth are equally polar

A liquid has a density of 1,2 g/mL. What is the mass of 250 mL of this liquid?

1. A300 g
2. B208 g
3. C30 g
4. D251,2 g