Chemistry for nursing entrance exams worksheet with answers

What causes the pressure of a gas in a container?

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

In a solution, what is the solvent?

1. AThe gas given off when a solid dissolves
2. BThe substance that does the dissolving, usually present in the larger amount
3. CAny solid that will not dissolve, however long it is stirred
4. DThe substance that is dissolved, usually present in the smaller amount

A cleaning solution has a pH of 12. How is it described?

1. AWeakly acidic
2. BStrongly basic
3. CStrongly acidic
4. DNeutral

What is the charge of a chloride ion?

1. A+1
2. B+7
3. C−1
4. D−2

What is the mass of 0.5 mol of NaCl (molar mass 58.5 g/mol)?

1. A117 g
2. B0.5 g
3. C29.25 g
4. D58.5 g

How much heat is needed to raise the temperature of 100 g of water by 10 °C (specific heat of water = 4.18 J/g·°C)?

1. A41,800 J
2. B418 J
3. C4180 J
4. D41.8 J

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A1 atm
2. B2.4 atm
3. C4 atm
4. D24 atm

Pepsin digests protein in the stomach at about pH 2, but it stops working once food moves into the small intestine, where the pH is higher. Why?

1. AThe change in pH alters the shape of pepsin's active site
2. BPepsin is used up completely in the stomach, just like a reactant
3. CThe small intestine is too cold for any enzyme
4. DPepsin only works on fats in the small intestine