Problem 1
List three properties of the elements that are useful in sorting the elements.
Problem 1
Describe how reactivity changes as you go down Group 1A.
Problem 1
Describe the dif erence between an element and a compound.
Problem 1
Explain what a chemical reaction is. What are some possible signs that a chemical reaction is taking place?
Problem 2
Explain the law conservation of mass in your own words.
Problem 2
In your own words, explain how it might be possible to start with copper and end up with copper at er a series of chemical reactions.
Problem 2
Do you expect carbon, C, to be more similar to nitrogen, N, oxygen, O, or silicon, Si? Why?
Problem 2
What is meant by physical form?
Problem 3
How many elements are included in the chemical formula for sodium nitrate, \(\mathrm{NaNO}_{3} ?\) Name them.
Problem 3
Use a reference book or the Internet to look up the average atomic masses and properties of silicon, Si, germanium, Ge, tin, Sn, phosphorus, P, antimony, Sb, sulfur, S, and selenium, Se. a. Organize these elements into rows and columns. b. List two properties that the elements in each column have in common.
