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

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A1
2. B3
3. C2
4. D0,5

Which method separates two liquids with different boiling points, such as alcohol and water?

1. ASieving
2. BUsing a magnet
3. CDistillation
4. DFiltration

What is a solution?

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

Nhiệt độ cao hơn thường ảnh hưởng thế nào đến lượng chất rắn hòa tan trong nước?

1. AKhông ảnh hưởng đến chất rắn
2. BChất rắn biến thành chất khí
3. CHòa tan được ít chất rắn hơn
4. DHòa tan được nhiều chất rắn hơn

Which nuclear process powers the Sun?

1. ACombustion of hydrogen gas with oxygen in its core
2. BAlpha decay of helium
3. CFission of uranium into smaller nuclei
4. DFusion of hydrogen nuclei to form helium

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe reaction rate
2. BThe temperature
3. CThe type of beaker used
4. DThe volume of acid, which is kept the same

Why does atomic radius decrease from left to right across a period?

1. AEach element adds a new electron shell
2. BMore protons pull the electrons of the same outer shell closer
3. CNeutrons push the electrons outward less strongly
4. DThe atoms lose electrons across the period

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AThey emit only alpha particles, which are harmless inside the body
2. BShort half-life isotopes are not radioactive
3. CThey give a strong signal for imaging but leave the body's tissues exposed only briefly
4. DThey stay active for many years, so a single dose can be used for every future scan