Chemistry for nursing entrance exams worksheet with answers

Which functional group is found in all alcohols?

1. AAmino group (–NH₂)
2. BCarbonyl group (C=O) only
3. CHydroxyl group (–OH)
4. DCarboxyl group (–COOH)

Why is water often called the universal solvent?

1. AIt is the only liquid found on Earth
2. BIt dissolves every substance completely
3. CIt has no partial charges anywhere in its molecule, so it mixes with everything
4. DIt dissolves more substances than other common liquids

Which process is exothermic (releases heat)?

1. AEvaporating water
2. BMelting a block of ice
3. CBurning methane gas
4. DPhotosynthesis

What are isomers?

1. ACompounds with the same molecular formula but different structures
2. BAtoms of the same element with different numbers of neutrons
3. CMolecules that contain the same number of bonds
4. DCompounds with the same structure but different molecular formulas

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

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

Which change would make a piece of chalk react faster with acid?

1. AUsing one large lump of chalk
2. BDiluting the acid with more water
3. CGrinding the chalk into a powder
4. DCooling the acid in a fridge

Why does oil not dissolve in water?

1. AOil molecules are charged ions
2. BWater is too dense to mix with anything
3. COil is nonpolar and water is polar, and "like dissolves like"
4. DOil reacts with water to form a solid

Which isotope notation describes an atom with 8 protons and 10 neutrons?

1. AOxygen-18
2. BArgon-18
3. CNeon-18
4. DOxygen-10