Chapter 1 Homework
Matter and Change

1.1 Chemistry is a Physical Science

1. Define chemistry.

2. List six branches of chemistry and define each.

3. Define
a) basic research
b) applied research
c) technological development.

4. a) Compare and contrast the three terms in question 3 above.
b) Give an example of each of the three terms in question 3 above.

5. In which of the six branches of chemistry would a scientist be working if he or she were doing the following:
a) investigating energy relationships for various reactions
b) comparing properties of alcohols with those of sugars
c) studying reactions that occur during the digestion of food
d) carrying out tests to identify unknown substances


1.2 Matter and Its Properties

1. a) What is the main difference between physical properties and chemical properties?
b) Give two examples of each.

2. Classify each of the following as either a physical change or a chemical change.
a) tearing a sheet of paper
b) melting a piece of wax
c) burning a log

3. You are given a sample of matter to examine. How do you decide whether the sample is a solid, liquid, or gas?

4. Contrast mixtures with pure substances.

5. a) Define mass.
b) Define volume.

6. a) Define property.
b) How are properties useful in classifying materials.

7. What is the difference between extensive properties and intensive properties?

8. a) Define physical properties.
b) List three examples of physical properties.

9. a) Define chemical properties.
b) List three examples of chemical properties.

10. What is meant by a change in state?

11. Identify each of the following as either a physical change or a chemical change. Explain your answers.
a) A piece of wood is sawed in half.
b) Milk turns sour.
c) Melted butter solidifies in the refrigerator.

1.3 Elements

1. Use the periodic table on the inside back cover to write the names for the elements that have the following symbols:
a) O
b) S
c) Cu
d) Ag

2. Use the periodic table to write the symbols for the following elements:
a) iron
b) nitrogen
c) calcium
d) mercury

3. a) Which elements are most likely to undergo the same kinds of reactions, those in a group or those in a period?
b) Explain

4. Describe the main differences between metals, nonmetals, and metalloids.

5. a) What is the significance of the vertical columns of the periodic table?
b) What is the significance of the horizontal rows.

6. a) Compare the physical properties of metals, nonmetals, metalloids, and noble gases.
b) Describe where in the periodic table each of these kinds of elements is located.

7. Suppose element X is a poor conductor of electricity and breaks when hit with a hammer. Element Z is a good conductor of electricity and heat. In what are of the periodic table does each element most likely belong?

8. a) Use the periodic table to write the names of the elements that have the following symbols
b) Identify each of the elements as a metal, nonmetal, metalloid, or noble gas.

1. K
2. Ag
3. Si
4. Na
5. Hg
6. He

9. An unknown element is shiny and is found to be a good conductor of electricity. What other properties would you predict for it?

10. a) Use the periodic table to identify the group number for each of the following;
b) Use the periodic table to identify the period numbers for each of the following

1. carbon, C
2. argon, Ar
3. chromium, Cr
4. barium, Ba