Name:__________ Date:____________
Period:___________ Page:___________
Problem of the day
The table shows the mass in grams of one atom of each of several elements. List the elements in order from the least mass to greatest mass per atom.
Element Mass per Atom
Carbon
Gold
1.995 x 10 -23 grams
3.272 x 10 -22 grams
Hydrogen
Oxygen
1.674 x 10 -24 grams
2.658 x 10 -23 grams
Silver 1.792 x 10 -22 grams
Essential Questions?
1.________________________________
2.________________________________
What does it mean?
7 𝑥 10
9
3 𝑥 10 8

Find
5 𝑥 10
5
3 𝑥 10 −2
Write the answer in scientific notation form
Now you try 
1.
6.63 𝑥 10
−6
5.1 𝑥 10 −2
.
Word Problems
In 2010, the world population was about 7 x 10 9 . The population of the United
States was about 3 x 10 8 . About how many times larger is the world population than the population of the United States?
: Write an expression to solve the problem
Both numbers should be in scientific notation form
Divide the coefficients
Divide the powers (keep the base subtract exponents)
Write the expression in standard form or scientific notation form
: (use the calculator to check)

The distance from Annabelle’s house to her friend’s house is 2 x 10 2 km. The distances from Annabelle’s house to her pen pal house is 8 x 10 3 km. How many times the distance to her best friend house is the distance of the pen pal’s house?
The surface area of Lake Superior, the largest of the Great Lakes, is 8 x 10 4 square kilometers. The surface area of the smallest Great Lake, Ontario, is 18,160 square kilometers. About how many times as great is the area covered by Lake
Superior than Lake Ontario?

1.
The population of city A is 8 x10 4 . The population of city B is 4 x 10 6 . How many times the population of city A is the population of city B?
2.
In 2010, the national debt of the United States was about 14 trillion dollars. In
2003 it was about 7 x 10 12 dollars. About how many times larger was the national debt in 2010?
3.
4 X 10 6 is ____________________ times as great as 6 x 10 3

Name:__________ Date:____________
Home Work
Consider that: Distance / Speed = time
Period:___________ Page:___________
A spacecraft leaves Earth’s orbit at a speed of 7 x 10 5 km per day. To travel from
Earth to Saturn, the craft needs to travel a total distance of 1.4 x 10 9 km. How long it will take the spacecraft to reach Saturn?
(using your scientific calculator)

Name: _____________________________
Lesson #9
Planets in the Solar System
Scientific Notation
Work Period
Masses of objects in space are so great that astronomers often need to use scientific notation to describe them. The approximate masses of planets in the solar system are given in the table.
Planet
Mercury
Venus
Earth
Approximate Mass
3.30 x 10
4.87 x 10
5.97 x 10
23
24
24
kg
kg
kg
Mars
Jupiter
Saturn
6.42 x 10 23 kg
1.89 x 10 27 kg
5.69 x 10 26 kg
Uranus
Neptune
8.68 x 10
1.02 x 10
25
26
kg
kg
1.) About how many times greater is the mass of Jupiter than the mass of Earth?
Write your answer in scientific notation.
2.) About how many times greater is the mass of Neptune than the mass of Earth?
Write your answer in scientific notation.
3.) About how many times greater is the mass of Jupiter than the mass of Mercury?
Write your answer in scientific notation.
4.) Saturn is about 1,724 times greater than which planet?
5.) Name the smallest and the largest planet
6.) About how many times greater is the mass the largest planet _______________ than the mass of the smallest planet ____________? Write your answer in scientific notation.

http://www.universetoday.com/13573/why-pluto-is-no-longer-a-planet/