Chemistry Cp Worksheet (Page 3 of 3) in pdf

Chemistry Cp Worksheet Page 3

3. Identify each of the following as either chemical properties or physical properties. If they are physical properties

identify them as either intensive or extensive.

a. burning in air

e. melting point

h. shape

b. boiling point

f. volume

i. odor

c. malleability

g. density

j. reactivity/stability

d. color

4. Know the difference between the three states of matter in terms of shape, volumes, compressibility, and particle

spacing.

5. Know the four different methods for separating mixtures mentioned in the book: filtration, distillation,

crystallization and chromatography.

6. Conservation of mass problems:

a. From a process that splits water to form hydrogen and oxygen, a scientist collected 20.0 grams of

hydrogen and 159 grams of oxygen. How much water was originally involved in the process?

Water  Hydrogen + Oxygen

b. In a flask, 20.3 grams of aluminum reacted with 200.0 grams of bromine to form aluminum bromide.

After the reaction, no aluminum remained and 17 grams of bromine remained un-reacted. How many

grams of bromine reacted? How many grams of aluminum bromide were formed?

Alumnium + Bromine  Aluminum Bromide

Percent by mass problems:

a. A 156 gram sample of an unknown compound contains 25 grams of hydrogen. What is the percent

by mass of hydrogen in the compound?

b. If 7.0 grams of substance X reacts with 21 grams of substance Y to form the compound XY, what is

the percent by mass of each element in the compound?

c. Two unknown compounds are tested. Compound 1 contains 90.0 grams of hydrogen and 180 grams

of oxygen. Compound 2 contains 45 grams of hydrogen and 90.0 grams of oxygen. Are the

compounds the same?

8. Law of Definite and Multiple Proportions

A sample of a certain lead compound contains 6.46 g of lead for each gram of oxygen. A second

sample has a mass of 68.54 g and contains 28.76 g of oxygen. Are the two samples the same?

Two different compounds are formed by the elements carbon and oxygen. The first compound

contains 42.9% by mass carbon and 57.1% by mass oxygen. The second compound contains 27.3%

by mass carbon and 72.7% by mass oxygen. Show that the data are consistent with the Law of

Multiple Proportions.

Chemistry Cp Worksheet Page 3