ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which mixture is a suspension?

1. ASugar dissolved in water
2. BSalt dissolved in water
3. COxygen dissolved in water
4. DSand stirred into water

Which process is exothermic (releases heat)?

1. APhotosynthesis
2. BMelting a block of ice
3. CEvaporating water
4. DBurning methane gas

What should a student always wear to protect the eyes when working with chemicals?

1. AReading glasses
2. BSunglasses
3. CContact lenses
4. DSafety goggles

การจัดเรียงอิเล็กตรอนของอะตอมโซเดียม (อิเล็กตรอน 11 ตัว) เป็นอย่างไร

1. A2, 8, 1
2. B8, 2, 1
3. C2, 8, 2
4. D2, 9

Which equation shows a combustion reaction?

1. AZn + CuSO₄ → ZnSO₄ + Cu
2. BNaOH + HCl → NaCl + H₂O
3. CCaCO₃ → CaO + CO₂
4. DC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

How many moles of gas are in 44.8 L at STP (0 °C and 1 atm)?

1. A2 mol
2. B22.4 mol
3. C0.5 mol
4. D44.8 mol

Which phase change absorbs energy from the surroundings (is endothermic)?

1. AFreezing
2. BSublimation
3. CCondensation
4. DDeposition

2090 J of heat is added to 50 g of water (specific heat 4.18 J/g·°C). By how much does its temperature rise?

1. A10 °C
2. B20 °C
3. C41.8 °C
4. D5 °C