ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What is an element?

1. AA substance of two or more elements chemically bonded together
2. BA substance made of only one kind of atom
3. CA particle with an electric charge
4. DA physical mixture of different substances

For a given substance, in which state do its particles move fastest?

1. AGas
2. BLiquid
3. CSolid
4. DThey move at the same speed in all states

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

1. AWeakly acidic
2. BStrongly basic
3. CStrongly acidic
4. DNeutral

A room is at 25 °C. What is this temperature in kelvin?

1. A248 K
2. B−248 K
3. C77 K
4. D298 K

Which element has the most metallic character?

1. AChlorine (Cl)
2. BCaesium (Cs)
3. CSodium (Na)
4. DAluminium (Al)

What is the oxidation number of sulfur in H₂SO₄?

1. A+4
2. B−2
3. C+6
4. D+2

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. AH₂O
2. BNH₃
3. COH⁻
4. DNH₄⁺ only

What is (8 × 10⁶) ÷ (2 × 10⁻²)?

1. A4 × 10⁸
2. B4 × 10⁻¹²
3. C4 × 10⁴
4. D16 × 10⁴