Chemistry for nursing entrance exams worksheet with answers

In which state of matter do particles have a fixed shape and a fixed volume?

1. APlasma
2. BSolid
3. CLiquid
4. DGas

Sodium and potassium belong to which group?

1. AThe alkaline earth metals (group 2)
2. BThe alkali metals (group 1)
3. CThe halogens (group 17)
4. DThe noble gases (group 18)

What is a hydrocarbon?

1. AA compound made of hydrogen and oxygen
2. BAny compound that dissolves in water
3. CA compound made of only hydrogen and carbon
4. DA carbon atom with a positive charge

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

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

Why does ice float on liquid water?

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

Which of these is a colloid?

1. AMilk
2. BSalt water
3. CPure water
4. DSand in water

In terms of bonds, why is a reaction exothermic?

1. ANo bonds are broken in exothermic reactions
2. BForming bonds always absorbs energy
3. CMore energy is absorbed breaking old bonds than is released forming new ones
4. DMore energy is released forming new bonds than is absorbed breaking old ones

Which statement correctly distinguishes a scientific law from a scientific theory?

1. AA law describes what happens; a theory explains why it happens
2. BA law is only a guess, while a theory is a proven fact
3. CA theory becomes a law once it is proved
4. DLaws apply only to chemistry, theories only to biology