ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

What does the rule "like dissolves like" mean?

1. ASolids dissolve only in other solids
2. BPolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
3. COnly substances with identical formulas can ever dissolve in each other
4. DEvery substance dissolves in water

Which state of matter has neither a fixed shape nor a fixed volume?

1. ALiquid
2. BGas
3. CCrystal
4. DSolid

What do the letters STP stand for in gas chemistry?

1. AStable temperature point
2. BStandard temperature and pressure
3. CSpecific temperature and particles
4. DStandard time and pressure

Why does ice float on liquid water?

1. AIce is denser than liquid water
2. BIce has a higher mass than the same volume of water
3. CIce is less dense than liquid water
4. DIce contains trapped air from the freezer

Which bond joins amino acids together in a protein?

1. AA glycosidic bond
2. BAn ionic bond
3. CA hydrogen bond
4. DA peptide bond

What is a polymer?

1. AA small molecule containing only two atoms of one element
2. BA mixture of several different elements
3. CAn ion with more than one charge
4. DA large molecule built from many repeating smaller units called monomers

ไอออนหนึ่งมีโปรตอน 12 ตัวและอิเล็กตรอน 10 ตัว คืออะไร

1. ANe
2. BNa⁺
3. CMg²⁺
4. DMg²⁻

A reaction should produce 2 mol of a product with a molar mass of 30 g/mol, but only 48 g is collected. What is the percent yield?

1. A60%
2. B125%
3. C80%
4. D48%