ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is a dilute solution?

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

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA combustion reaction
2. BA neutralisation reaction
3. CEndothermic
4. DExothermic

A cleaning solution has a pH of 12. How is it described?

1. AStrongly basic
2. BNeutral
3. CStrongly acidic
4. DWeakly acidic

What is the normal boiling point of a liquid?

1. AThe temperature at which its particles stop moving
2. BThe temperature at which its density is greatest
3. CThe temperature at which its vapour pressure equals 1 atmosphere
4. DThe temperature at which it first starts to evaporate

อะตอมแมกนีเซียมสูญเสียอิเล็กตรอนสองตัว ไอออนที่เกิดขึ้นคืออะไร

1. AMg²⁻
2. BMg⁺
3. CMg²⁺
4. DMg⁻

What is the name of the compound CaCO₃?

1. ACalcium oxide
2. BCarbon calcium trioxide
3. CCalcium carbide
4. DCalcium carbonate

In Rutherford's gold foil experiment, most alpha particles passed straight through the foil but a few bounced back. What did this show?

1. AAn atom is mostly empty space with a small, dense, positive nucleus
2. BElectrons move in fixed circular orbits
3. CAtoms are solid, indivisible spheres
4. DElectrons are spread evenly through a positive "pudding"

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A7
2. B14
3. C11
4. D3