HW Chapter 2 Part 1

HW chapter 3 and 4 (4.1 -4.10) - Due Monday 1/12/09

Chapter 3

1. Classify each of the following properties as physical or chemical.

a. The color of gold

b. the liquid propane in a gas grill evaporates because the user left the valve open

c. sugar dissolves in water

d. sugar burns when heated on a skillet

2. Classify each of the following as a pure substance or a mixture. If it is a pure

substance, classify it as an element or a compound. If it is a mixture, classify it as

homogenous or homogenous

a. Sweat b. carbon dioxide

c. aluminum d. vegetable soup

A X 3. Write the isotopic symbol using both of the form X-A and Z for the following

isotopes

a. The argon isotope with 22 neutrons

b. The phosphorous isotope with 16 neutrons

c. The fluorine isotope with 10 neutrons

1 4. Fill in the blanks to complete the following table.

Element Z A p n e Iron 30

Bromine 80

5. a. A neutral atom has a mass number of 80 and has 45 neutrons. Write the complete

symbol

b. An atom has two more proton and two more electrons than the atom in the

question above. What is its complete symbol?

6. Is the element marked in red on the following periodic table likely to be a gas, a

liquid or a solid? What is the atomic number of the element in blue? Name at lest

one other element that is chemically similar to the element in green.

7. Give the names and atomic number corresponding to the following symbols.

Identify whether it is metal or nonmetal and provide its group name if it has any.

a. H b. Kr

2 c. Mg d. Co

e. Br f. Ra