护理入学考试化学练习卷（附答案）

哪种物质是碱？

1. A食醋（乙酸）
2. B氢氧化钠（NaOH）
3. C盐酸（HCl）
4. D柠檬汁（柠檬酸）

What does the subscript 2 in H₂O tell you?

1. AWater has a charge of 2
2. BEach molecule contains two oxygen atoms
3. CEach molecule contains two hydrogen atoms
4. DThere are two water molecules

What are the building blocks of carbohydrates such as starch?

1. AFatty acids joined to a glycerol molecule
2. BNucleotides
3. CMonosaccharides (simple sugars) such as glucose
4. DAmino acids

What colour is phenolphthalein indicator in a basic solution?

1. AColourless
2. BBlue
3. CPink
4. DYellow

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A25%
2. B133%
3. C75%
4. D5%

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

1. A248 K
2. B−248 K
3. C298 K
4. D77 K

Equal masses of sand and water sit in the sun and absorb the same amount of heat. Which warms up more, and why?

1. AWater, because it has a higher specific heat capacity than sand
2. BBoth warm equally, because they absorbed the same heat
3. CSand, because it has a lower specific heat capacity than water
4. DSand, because it has a higher specific heat capacity than water

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AOlive oil molecules are ionic, while butter molecules are covalent
2. BButter contains more water, which freezes at room temperature
3. COlive oil has more C=C double bonds, which kink the chains so they cannot pack closely
4. DOlive oil has no C=C double bonds, so its chains stay straight and pack tightly