ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the octet rule state?

1. AAn atom can form a maximum of 8 covalent bonds
2. BEvery stable atom has exactly 8 protons in its nucleus
3. CEvery stable molecule contains exactly 8 atoms
4. DAtoms tend to gain, lose or share electrons to get 8 outer electrons

What is the SI unit of energy?

1. AWatt
2. BKelvin
3. CNewton
4. DJoule

What is a dilute solution?

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

What is the oxidation number of sulfur in H₂SO₄?

1. A+2
2. B−2
3. C+4
4. D+6

เหตุใดแก๊สมีตระกูลจึงทำปฏิกิริยาได้ยาก

1. Aไม่มีอิเล็กตรอนเลย
2. Bล้วนเป็นสารกัมมันตรังสี
3. Cอะตอมมีขนาดใหญ่กว่าอะตอมอื่นมาก
4. Dระดับพลังงานนอกสุดของอิเล็กตรอนเต็มอยู่แล้ว

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AThe reactants run out immediately
2. BThe equilibrium shifts to the left to form more reactants
3. CThe reaction rate drops to zero
4. DMore product keeps forming as the equilibrium shifts to the right

Ethene has the structure H₂C=CH₂. How many electrons are shared between the two carbon atoms?

1. A8
2. B4
3. C2
4. D6

Alpha radiation is stopped by skin, yet an alpha source is very dangerous if swallowed or inhaled. Why?

1. AAlpha particles are only produced at body temperature
2. BAlpha particles turn into much more penetrating gamma rays once inside the body
3. CStomach acid makes the alpha source more radioactive
4. DInside the body, alpha particles deposit all their energy in nearby living cells