Today the majority of students found the Quiz for Chapter 3 too difficult! We will be re-writing the quiz tomorrow after making sure we have reviewed the important concepts and vocabulary in chemistry carefully.
The homework we issued today was
Pg 89 #1a - n
Pg 251 # 1 - 6
Pg 254 # 1 - 6
Tomorrow we will begin our class with a lesson in science vocabulary. I will give half the vocabulary words for the class to study in groups, and write down definitions for in preparation for the quiz. We will then complete it as a fill in the blanks style quiz, and go over the answers as a class.
Next we will go over some examples from page 89 and 90 on formula writing. It is my hope that by doing this work as a class, we will be prepared to re-take the quiz. Then we will go on to our lesson in Electricity with some demonstrations, and collect homework.
Here are the answers to last week's Chapter 2 Quiz:
- c
- b
- c
- b
- c
- d
- c
- a
- d
- a
- f
- g
- b
- h
- d
- a
The answers to page 67 # 1-3 are:
1. 2, 8, 8, 18
2. (a) H 1p 1
(b) Li 3p 2, 1
(c) Na 11p 2, 8, 1
(d) K 19p 2, 8, 8, 1
3. (a) 1
(b) 2
(c) 7
(d) 8
The answers to page 72 # 1- 19 are:
1. An element is a pure substance made of only
one kind of atom. Specifically, all the atoms of
the element have the same number of protons.
2. Accept all logical answers. For example, pennies
contain copper and zinc, and ice cubes
contain hydrogen and oxygen.
3. (a) Phosphorus
(b) Beryllium
(c) Potassium
(d) Cobalt
4. (a) He
(b) Li
(c) B
(d) Mg
(e) Ca
5. Mercury and bromine
6. Shiny, silver coloured, malleable, ductile, conduct
electricity, conduct heat
7. (a) Carbon, other metals
(b) Steel
8. Mercury is liquid at room temperature and is
not as good a conductor as silver.
9. Periodic table
10. Atomic mass measures the mass of an atom of
the element.
11. Number of protons = atomic number
12. A chemical family is a group of elements that
have similar chemical and physical properties.
They occur in columns of the periodic table.
13. Alkali metals, alkaline earth metals, halogens,
noble gases
14. Less reactive
15. They are unreactive.
16. A Bohr model represents the arrangement of
electrons in an atom.
17. (a) The valence shell is the outermost occupied
electron shell in an atom.
(b) A valence electron is an electron that occupies
the valence shell.
18. (a) 1
(b) 3
(c) 6
(d) 8
19. (a) Noble gases
(b) Their filled valence shells make the atoms
of the noble gases unreactive.
