ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which property is typical of nonmetals?

1. AThey are poor conductors of heat and electricity
2. BThey are shiny and easily bent into wires
3. CThey are all solids at room temperature
4. DThey easily lose electrons to form positive ions

What colour does blue litmus paper turn in an acid?

1. ARed
2. BGreen
3. CBlue (no change)
4. DPurple

ในสารละลายเกลือ เกลือเรียกว่าอะไร

1. Aตัวทำละลาย
2. Bตัวถูกละลาย
3. Cตัวเร่งปฏิกิริยา
4. Dตะกอน

Which bond joins amino acids together in a protein?

1. AAn ionic bond
2. BA glycosidic bond
3. CA peptide bond
4. DA hydrogen bond

How does dissolving salt in water affect the water's boiling point?

1. AIt has no effect on the boiling point
2. BIt makes the water boil at room temperature
3. CIt raises the boiling point slightly
4. DIt lowers the boiling point slightly

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

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

Marble chips react with hydrochloric acid, giving off CO₂. The gas is produced quickly at first, then more and more slowly. Why does the rate fall?

1. AThe CO₂ produced turns back into acid
2. BThe activation energy steadily increases as the reaction goes on
3. CThe acid concentration falls as it is used up, so collisions become less frequent
4. DThe products act as a catalyst that slows the reaction down

Which substance has the lowest boiling point?

1. AWater
2. BHelium
3. CIron
4. DSodium chloride