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

What is an unsaturated solution?

1. AA solution with undissolved solid at the bottom
2. BA solution that can still dissolve more solute
3. CA solution with no solute at all
4. DA solution that holds the maximum possible solute

Những hạt hạ nguyên tử nào có trong hạt nhân?

1. AElectron và neutron
2. BChỉ electron
3. CProton và neutron
4. DProton và electron

Which is a sign that a chemical reaction may have taken place?

1. AWater freezes into ice when put in a freezer
2. BA block of wax melts when it is heated
3. CA gas is produced when two liquids are mixed
4. DSugar dissolves completely when stirred into water

Water climbs up a narrow glass tube. Which property mainly causes this?

1. ALow density of water
2. BEvaporation of water from the tube
3. CAdhesion of water to the glass
4. DWater's high boiling point

Điện tích của ion chloride là bao nhiêu?

1. A−1
2. B+1
3. C+7
4. D−2

A solution has a pH of 2. What is its hydrogen ion concentration?

1. A2 mol/L
2. B1 × 10⁻¹² mol/L
3. C1 × 10⁻² mol/L
4. D1 × 10² mol/L

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. AF⁻
2. BNa⁺
3. CMg²⁺
4. DO²⁻

A reaction at equilibrium has a very large equilibrium constant (K much greater than 1). What does this tell you?

1. AThe reaction cannot reach equilibrium
2. BAt equilibrium, the mixture contains mostly products
3. CAt equilibrium, the mixture contains mostly reactants
4. DThe reaction is very fast