Pascal’s Principle

1.  A dentist’s chair makes use of Pascal’s principle to move patients up and down. Together, the chair and a patient exert a downward force of 2,269 N. The chair is attached to a large piston with an area of 1,221 cm2. To move the chair, a pump applies a force to a small piston with an area of 88.12 cm2. What force must be exerted on the small piston to lift the chair?

2.  An engineering student wants to build her own hydraulic pump to lift a 1,815 N crate. The pump will have two pistons connected via a fluid chamber. The student calculates that she will be able to exert 442 N of force on the small piston, which will have an area of 50.2 cm2. What area must the large piston be to exert the desired force?

Pressure

3.  What pressure does a 130 pound women exert on the floor when she balances on one of her heels? Her heels have an average radius of 0.5 in2. In this problem, the units for pressure would be pounds/in2 (or PSI – pounds per square inch).

4.  What is the pressure on 2m2 surface where you push with a force of 6 Newtons?

Boyle’s Law

5.  An oxygen tank holds 355 L of oxygen at 8,320 kPa. What volume would the same amount of oxygen take up of the pressure where reduced to 4,110 kPa? Assume that the temperature remains the same.

6.  A balloon is filled with helium in an airplane, where the air pressure is 81 kPa. The filled balloon has a volume of 4.2 L. When the plane lands, the cabin is depressurized to the outside air pressure, which is 94 kPa. If the temperature of the balloon remains the same, what is the new volume of the balloon?

Moles to Mass

7.  What is the mass in grams of 0.48 mol of platinum, Pt?

8.  What is the mass in grams of 3.20 mol of copper, Cu?

Mass to Moles

9.  How many moles are present in 620 g of mercury, Hg?

10.  How many moles are present in 205 g of helium, He?

Naming Ionic Bonds

Complete the following chemical equations OR names. Use your periodic table and polyatomic ions worksheet.

11.  Iron (III) Oxide

12.  K3PO4

13.  Aluminum Hydroxide

14.  Ba(NO3)2

15.  Na2SO4

Balancing and Identifying Chemical Reactions

16.  _____ Fe + _____ H20 → Fe2O3 + _____ H2

17.  Al2(SO4)3 + _____Ca(OH)2 → _____Al(OH)3 + _____CaSO4

18.  Ca(ClO3)2 → CaCl2 + _____O2

19.  Number 16 (above) is a______reaction.

20.  Number 17 (above) is a______reaction.

21.  Number 18 (above) is a______reaction.