ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the subscript 2 in H₂O tell you?

1. AEach molecule contains two hydrogen atoms
2. BEach molecule contains two oxygen atoms
3. CThere are two water molecules
4. DWater has a charge of 2

What is the formula of methane, the main gas in natural gas?

1. ACH₄
2. BCH₂
3. CCO₂
4. DC₂H₆

สารใดเป็นเบส

1. Aน้ำมะนาว (กรดซิตริก)
2. Bโซเดียมไฮดรอกไซด์ (NaOH)
3. Cกรดไฮโดรคลอริก (HCl)
4. Dน้ำส้มสายชู (กรดแอซีติก)

A student tests how temperature affects the rate of a reaction. What is the independent variable?

1. AThe temperature
2. BThe type of beaker used
3. CThe volume of acid, which is kept the same
4. DThe reaction rate

Oxygen has 8 electrons. What is its electron configuration?

1. A1s² 2s² 2p⁶
2. B1s² 2s² 2p⁴
3. C1s² 2s⁶
4. D1s² 2p⁶

How many molecules are in 2 mol of carbon dioxide?

1. A3.01 × 10²³
2. B6.02 × 10²³
3. C2.00 × 10²³
4. D1.20 × 10²⁴

Diamond is extremely hard and has a very high melting point. Which explanation is correct?

1. AIt is held together by ionic bonds between C⁺ and C⁻ ions
2. BIt is made of separate small molecules with strong forces between them
3. CIt contains delocalised electrons like a metal
4. DEach carbon is covalently bonded to four others in a giant network

Which approach best reduces a health worker's exposure to ionising radiation?

1. ALimit the time near the source, increase the distance and use shielding
2. BStand closer to the source so the job is finished sooner and exposure is shorter
3. CRely only on wearing gloves
4. DWork faster without any shielding