Chemistry for nursing entrance exams worksheet with answers

How does increasing the concentration of a reactant in solution usually affect the reaction rate?

1. AThe rate increases
2. BThe reaction stops
3. CThe rate stays the same
4. DThe rate decreases

What is activation energy?

1. AThe energy stored in the products
2. BThe energy needed to melt a solid
3. CThe total energy released once the reaction has finished
4. DThe minimum energy reacting particles need for a reaction to happen

In a chemical reaction, what is the limiting reactant?

1. AThe reactant that runs out first and stops the reaction
2. BThe catalyst that controls the speed
3. CThe reactant with the largest mass
4. DThe reactant that is left over at the end

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

1. A8 mol
2. B4 mol
3. C6 mol
4. D3 mol

Which coefficients balance the equation __H₂ + __O₂ → __H₂O?

1. A2, 1, 2
2. B2, 2, 2
3. C1, 2, 1
4. D1, 1, 1

What is the molar mass of water (H = 1 g/mol, O = 16 g/mol)?

1. A18 g/mol
2. B10 g/mol
3. C17 g/mol
4. D32 g/mol

In the equation N₂ + 3H₂ → 2NH₃, how many grams of ammonia (17 g/mol) can be made from 1 mol of N₂ with excess hydrogen?

1. A28 g
2. B17 g
3. C34 g
4. D51 g

A sample contains 3.01 × 10²³ molecules of water. How many moles is that?

1. A0.5 mol
2. B3.01 mol
3. C1.81 mol
4. D2 mol