Fall Semester Final Exam - Chemistry Review Worksheet

21.

How can the number of protons (and electrons) be determined for a particular element, using the

periodic table? (p.41) __________________________________________________________________

22.

What are valence electrons? (7G: p.61) ____________________________________________________

23.

How can the number of valence electrons for elements in groups 1-2 & 13-18 be determined?

(7G p.62) ____________________________________________________________________________

24.

How can the number of electrons shells (also called energy levels or orbitals) for an element be

determined? _________________________________________________________________________

25.

What groups or families have the most reactive elements? Why? ______________________________

____________________________________________________________________________________

26.

The elements in group 17, including fluorine, bromine, chlorine and iodine, are called the halogens.

Describe the reactivity of the halogens, and why they have this reactivity. ________________________

____________________________________________________________________________________

27.

Which of the following elements is most reactive: carbon, sodium, magnesium, boron? _____________

Why? _______________________________________________________________________________

28.

What group or family has the least reactive elements? Why? __________________________________

____________________________________________________________________________________

29.

Which group contains the “noble gases”? (pp.72-73) ____________ Why are they called noble gases?

___________________________________________________________________________________

30.

What is a physical change? (p.90) Give three examples. ______________________________________

___________________________________________________________________________________

31.

What is a chemical change? (p.90) Give three examples. _____________________________________

___________________________________________________________________________________

32.

Give five different kinds of evidence that would suggest that a chemical change (reaction) has taken

place. (p.91) _________________________________________________________________________

___________________________________________________________________________________

Fall Semester Final Exam - Chemistry Review Worksheet - 8th Grade Page 3