ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which of these is a heterogeneous mixture?

1. ASalt dissolved in water
2. BAir
3. COil and water
4. DSugar dissolved in tea

What is the name for the attraction of water molecules to each other?

1. ADiffusion
2. BCohesion
3. COsmosis
4. DAdhesion

What does organic chemistry study?

1. AOnly compounds found in plants
2. BCompounds based on carbon
3. CCompounds made of metals
4. DOnly the noble gases

What is the formula of sodium sulfate, made from Na⁺ and SO₄²⁻ ions?

1. ANaSO₄
2. BNa(SO₄)₂
3. CNa₂SO₄
4. DNa₄SO₂

Which substance is a non-electrolyte when dissolved in water?

1. AHydrochloric acid
2. BPotassium chloride
3. CSodium chloride
4. DGlucose

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMgO
2. BMg₂O
3. CMg₂O₂
4. DMgO₂

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ACl₂
2. BNa
3. CNa⁺
4. DNaCl

An isotope has a half-life of 8 days. How long does it take for 100 g to decay to 12.5 g?

1. A24 days
2. B16 days
3. C32 days
4. D64 days