ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is the term for anything that has mass and takes up space?

1. AMatter
2. BHeat
3. CForce
4. DEnergy

สูตรเคมีของน้ำคืออะไร

1. AH₂O₂
2. BOH
3. CHO₂
4. DH₂O

Which positive ion is found in the highest concentration inside most body cells?

1. APotassium (K⁺)
2. BCalcium (Ca²⁺)
3. CMagnesium (Mg²⁺)
4. DSodium (Na⁺)

Why does ice float on liquid water?

1. AIce has a higher mass than the same volume of water
2. BIce contains trapped air from the freezer
3. CIce is less dense than liquid water
4. DIce is denser than liquid water

A room is at 25 °C. What is this temperature in kelvin?

1. A−248 K
2. B298 K
3. C248 K
4. D77 K

Potassium forms K⁺ ions and sulfur forms S²⁻ ions. What is the name and formula of their compound?

1. APotassium sulfite, KS
2. BPotassium sulfide, KS₂
3. CPotassium sulfate, K₂SO₄
4. DPotassium sulfide, K₂S

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA giant covalent network solid
2. BA metal with delocalised electrons
3. CA simple molecular (covalent) substance
4. DAn ionic compound (a lattice of ions)

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A40 g
2. B48 g
3. C160 g
4. D80 g