ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the subscript 2 in H₂O tell you?

1. AEach molecule contains two hydrogen atoms
2. BWater has a charge of 2
3. CThere are two water molecules
4. DEach molecule contains two oxygen atoms

อะตอมหนึ่งมีโปรตอน 6 ตัว นิวตรอน 6 ตัว และอิเล็กตรอน 6 ตัว เลขมวลของอะตอมนี้คือเท่าใด

1. A0
2. B18
3. C6
4. D12

น้ำเกลือเป็นตัวอย่างของสสารชนิดใด

1. Aสารประกอบ
2. Bสารผสมเนื้อเดียว (สารละลาย)
3. Cสารผสมเนื้อผสม
4. Dธาตุบริสุทธิ์

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number falls by 2 and atomic number falls by 4
2. BMass number stays the same and atomic number rises by 1
3. CNeither changes
4. DMass number falls by 4 and atomic number falls by 2

Why is a carbon dioxide extinguisher effective on many fires?

1. ACO₂ is denser than air and pushes oxygen away from the fire
2. BCO₂ adds oxygen to cool the flames
3. CCO₂ reacts chemically with the fuel to make it non-flammable
4. DCO₂ is a liquid that soaks into the fuel

How many grams are in 2.5 kg?

1. A25 g
2. B0.0025 g
3. C2500 g
4. D250 g

Haemoglobin binds oxygen reversibly: Hb + O₂ ⇌ HbO₂. How does this equilibrium help deliver oxygen to tissues?

1. ALow O₂ in tissues shifts it to the left, releasing oxygen
2. BHigh O₂ in tissues shifts it to the left, absorbing oxygen
3. CThe equilibrium does not change anywhere in the body
4. DLow O₂ in tissues shifts it to the right, releasing oxygen

Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?

1. ASteam particles are hotter than water particles at the same reading
2. BSteam releases a large amount of extra energy as it condenses on the skin
3. CLiquid water cannot pass any of its heat to the skin
4. DSteam carries dissolved acid that damages the skin