Chemistry for nursing entrance exams worksheet with answers

What causes the pressure of a gas in a container?

1. AGas particles sticking to the walls
2. BThe weight of the container pressing on the gas inside
3. CGas particles stopping and pushing outward
4. DGas particles colliding with the container walls

Where are the transition metals located on the periodic table?

1. AIn the central block, groups 3 to 12
2. BAbove the noble gases
3. CIn group 18 on the far right
4. DIn group 1 on the far left

What does the coefficient 3 in "3H₂O" mean?

1. AEach molecule of water contains three hydrogen atoms
2. BWater has a charge of 3
3. CThere are three molecules (or moles) of water
4. DEach water molecule has three oxygen atoms

How does increasing the temperature usually affect the rate of a reaction?

1. AIt decreases the rate
2. BIt increases the rate
3. CIt has no effect on the rate
4. DIt stops the reaction completely

Why does stirring help a solid dissolve faster?

1. AIt brings fresh solvent into contact with the solid's surface
2. BIt raises the temperature of the solvent by friction a great deal
3. CIt increases the amount of solute that can dissolve in total
4. DIt turns the solid into a liquid

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium does not change
2. BThe equilibrium shifts toward the products, raising the yield
3. CThe equilibrium shifts toward the reactants
4. DThe reaction becomes endothermic

A metal reacts with an acid and a gas is given off that burns with a squeaky pop. Which gas is it?

1. AOxygen
2. BNitrogen
3. CCarbon dioxide
4. DHydrogen

A scuba diver breathes compressed air deep underwater. Why must the diver breathe out while swimming up to the surface?

1. AOxygen turns to liquid at the surface
2. BThe water gets warmer near the surface
3. CThe air in the lungs shrinks as the outside pressure falls
4. DThe air in the lungs expands as the outside pressure falls