Chemistry Chapter 4 Homework
Section I: Vocabulary – Pg 121 (15 words)
Section II: Key Points
1.
Who first proposed the existence of the atom? What did he think they were?
2.
How is an atom similar to an element?
3.
What are Dalton’s 4 postulates?
4.
In a cathode ray tube, what is the name of the terminals and what is their charge?
5.
How was the negative charge of the electron discovered?
6.
What was Thompson’s model of the atom called?
7.
Make a chart and answer the following about the 3 subatomic particles:
Name:
Charge
Location
Mass
8.
Who discovered that the atom is made up of mostly space? How did he prove this?
9.
What subatomic particle gives each atom its identity?
10.
In a stable element, how is the number of electrons determined?
11.
What smaller particles do scientists believe protons & neutrons are made of?
12.
How is the mass of an atom determined?
13.
The amu is said to be a relative measurement. What is it relative to?
14.
Draw the element O in periodic table format and label its atomic #, mass, # of e-,
& # of protons.
15.
Write the element O in chemical notation. Label the mass and atomic #.
16.
What is an isotope?
17.
How is the average atomic mass of an isotope determined?
18.
How does the periodic table arrange the elements?
19.
Where are the periods located on the periodic table?
20.
Where are the groups located on the periodic table?
Section III: Problems
Pg. 122 – 123 Q: 48, 50, 60, & 65
Pg. 125 Q: 1 – 9

Letter & answer (1-6)

Correct any wrong statements (7-9)