Chemistry for nursing entrance exams worksheet with answers

Which particle in an atom has a positive charge?

1. AProton
2. BNeutron
3. CPhoton
4. DElectron

According to collision theory, what must happen for particles to react?

1. AThey must stay completely still next to each other
2. BThey must collide with enough energy and the right orientation
3. CThey must both be in the solid state at the same time
4. DThey must have the same mass

What is the term for anything that has mass and takes up space?

1. AMatter
2. BForce
3. CHeat
4. DEnergy

How does dissolving salt in water affect the water's boiling point?

1. AIt raises the boiling point slightly
2. BIt has no effect on the boiling point
3. CIt makes the water boil at room temperature
4. DIt lowers the boiling point slightly

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

1. ACombustion
2. BCondensation
3. CPolymerisation
4. DHydrolysis

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AExothermic
2. BNuclear
3. CReversible only
4. DEndothermic

Making ammonia (N₂ + 3H₂ ⇌ 2NH₃) is exothermic. A low temperature would give a higher yield, yet factories use a moderately high temperature. Why?

1. AHigher temperatures shift the equilibrium toward more ammonia
2. BLow temperatures would make the ammonia explode
3. CAt low temperatures the reaction is too slow to be useful
4. DThe catalyst only works when the reaction is endothermic

A carboxylic acid reacts with an alcohol in the presence of an acid catalyst. What are the products?

1. AAn alkane and oxygen
2. BAn ester and water
3. CAn amino acid and carbon dioxide
4. DA salt and hydrogen