Name __________________________________
Period ___________ Date ________________
Homework #__________
Scientific Notation (2)
(Multiplication)
1.
Multiply these expressions.
(
)(
a.
)
b.
(
)(
c.
(
d.
(
)(
e.
(
)
)(
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)
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)
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)
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2.
There are approximately
atoms in a gram of silver. How many atoms are there in 3
kilograms of silver? Express your answer in scientific notation.
3.
Because the number of molecules in a given amount of a compound is usually a very large number,
scientists often work with a quantity called a mole. One mole is about
molecules.
4.
a.
A liter of water has about 55.5 moles of
in scientific notation.
b.
How many molecules are in
answer in scientific notation.
. How many molecules is this? Write your answer
moles of a compound? Approximate and write you
Cal and Al were assigned this
multiplication problem for homework:
Cal got an answer of
and Al got
,
.
(
)(
a.
Are Cal’s and Al’s answers equivalent?
Explain why or why not?
b.
Whose answer is in scientific notation?
c.
Find another exponential expression equivalent to Cal’s and Al’s answers.
d.
Explain how you can rewrite a number, such as
in scientific notation.
)
5.
Americans make almost 2 billion telephone calls each day. (www.britannica.com)
a.
Write this number in standard notation and in scientific notation.
b.
6.
On average a person sheds 1 million dead skin cells every 40 minutes. (The world in one day, 1997, p. 16)
a.
How many dead skin cells does a person shed in an hour? Write your answer in scientific
notation.
b.
7.
How many phone calls do Americans make in one year? (Assume that there are 365 days in a
year.) Write you answer in scientific notation.
How many dead skin cells does a person shed in a year? (Assume that there are 365 days in a
year.) Write your answer in scientific notation.
A light-year is the distance light can travel in one year. This distance is approximately 9,460 billion
kilometers. The Milky Way galaxy is estimated to be about 100,000 light years in diameter.
a.
Write both distances in scientific notation.
b.
Find the diameter of the Milky Way in kilometers. Use scientific notation.
c.
Scientists estimate the diameter of the earth is greater than
larger is the diameter of the Milky Way?
km. How many times