Chemistry for nursing entrance exams worksheet with answers

Which quantity is the same for 1 mole of any substance?

1. AThe mass in grams
2. BThe number of particles
3. CThe volume as a liquid
4. DThe number of atoms per molecule

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A1
2. B0.5
3. C2
4. D3

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction releases heat
2. BThe reaction is reversible
3. CThe reaction is very fast
4. DThe reaction needs a catalyst

In 2KClO₃ → 2KCl + 3O₂, how many moles of O₂ form from 4 mol of KClO₃?

1. A6 mol
2. B3 mol
3. C8 mol
4. D4 mol

What is the electron arrangement of a sodium atom (11 electrons)?

1. A2, 8, 1
2. B2, 9
3. C2, 8, 2
4. D8, 2, 1

Rubbing alcohol evaporates faster than water at room temperature. What does this suggest?

1. AIts molecules are heavier than water molecules
2. BIts intermolecular forces are stronger than water's
3. CIts intermolecular forces are weaker than water's
4. DIt has a higher boiling point than water

A reaction takes in 50 kJ of energy from the surroundings. Which statement is true?

1. AIt is exothermic, and the products have less energy than the reactants
2. BNo energy change happened, because energy is conserved
3. CIt is endothermic, and the products have more energy than the reactants
4. DIt is endothermic, and the products have less energy than the reactants

Chlorine has two common isotopes, chlorine-35 (about 75%) and chlorine-37 (about 25%). What is its average atomic mass?

1. AExactly 36
2. BAbout 35.5
3. CAbout 36.5
4. DExactly 35