ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is a dilute solution?

1. AOne with a large amount of solute in a little solvent
2. BOne with no solvent at all
3. COne with a small amount of solute in a lot of solvent
4. DOne in which the solute has reacted with the solvent

อะตอมหนึ่งมีโปรตอน 6 ตัว นิวตรอน 6 ตัว และอิเล็กตรอน 6 ตัว เลขมวลของอะตอมนี้คือเท่าใด

1. A6
2. B12
3. C18
4. D0

In a chemical equation, what are the reactants?

1. AThe numbers written in front of each formula
2. BThe catalysts written above the arrow
3. CThe new substances formed, written to the right of the arrow
4. DThe starting substances, written to the left of the arrow

Which gas forms when hydrochloric acid reacts with calcium carbonate?

1. AOxygen
2. BCarbon dioxide
3. CHydrogen
4. DChlorine

What is the oxidation number of sulfur in H₂SO₄?

1. A−2
2. B+4
3. C+2
4. D+6

สัมประสิทธิ์ชุดใดดุลสมการ __H₂ + __O₂ → __H₂O

1. A1, 1, 1
2. B1, 2, 1
3. C2, 2, 2
4. D2, 1, 2

Which 1-litre solution lowers the freezing point of water the most?

1. A1 M glucose
2. B1 M NaCl
3. C1 M CaCl₂
4. D0.5 M NaCl

In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?

1. AEnergy is released, often as light
2. BEnergy is absorbed from the surroundings
3. CThe electron leaves the atom
4. DThe atom gains a proton