ใบงาน เคมีสำหรับข้อสอบเข้าพยาบาล พร้อมเฉลย

Which element makes up the largest share of the human body by mass?

1. ACarbon
2. BHydrogen
3. COxygen
4. DNitrogen

In which state are most metals at room temperature?

1. ASolid
2. BPlasma
3. CLiquid
4. DGas

Which acid is found in the stomach?

1. AHydrochloric acid
2. BAcetic acid
3. CSulfuric acid
4. DNitric acid

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe mixture is formed by a chemical reaction between the two elements
2. BThe mixture has a fixed ratio of iron to sulfur
3. CThe compound keeps the magnetic properties of iron
4. DThe mixture can be separated physically, for example with a magnet

How does atomic radius change going down a group?

1. AIt decreases
2. BIt decreases, then increases
3. CIt stays the same
4. DIt increases

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. AHydrolysis
2. BCombustion
3. CPolymerisation
4. DCondensation

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
2. BThe water temperature and the dissolving time
3. CNothing, because changing several factors at once gives more useful data
4. DOnly the colour of the cup

Which phase change absorbs energy from the surroundings (is endothermic)?

1. AFreezing
2. BDeposition
3. CSublimation
4. DCondensation