ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A2
2. B0.5
3. C1
4. D3

Which unit is commonly used for the density of a liquid?

1. AmL/g
2. Bg·mL
3. Ckg
4. Dg/mL

Between which kinds of elements do ionic bonds usually form?

1. AA metal and a nonmetal
2. BTwo noble gases
3. CTwo identical metals
4. DTwo nonmetals

ที่อุณหภูมิคงที่ ปริมาตรของแก๊สลดลงครึ่งหนึ่ง ความดันจะเป็นอย่างไร

1. Aเพิ่มเป็นสองเท่า
2. Bคงเดิม
3. Cลดลงครึ่งหนึ่ง
4. Dเหลือหนึ่งในสี่

What is the name of the molecular compound CO?

1. ACarbon oxide
2. BCarbon monoxide
3. CCarbon dioxide
4. DMonocarbon oxide

Why does stirring help a solid dissolve faster?

1. AIt turns the solid into a liquid
2. BIt brings fresh solvent into contact with the solid's surface
3. CIt increases the amount of solute that can dissolve in total
4. DIt raises the temperature of the solvent by friction a great deal

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

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

How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?

1. AThe gas turns into a solid at higher temperature
2. BTemperature has no effect on gas solubility
3. CLess gas dissolves, so warm drinks go flat faster
4. DMore gas dissolves, so warm drinks stay fizzy for longer