Transcribed Text
20
A raindrop has a mass of 50. mg and the Pacific Ocean has a mass of 7.08 X 10 kg.
Use this information to answer the questions below. Be sure your answers have the correct number of significant
digits.
x10
What is the mass of 1 mole of raindrops?
g
Round your answer to 2 significant digits.
X
?
How many moles of raindrops are in the Pacific Ocean?
Round your answer to 2 significant digits.
Evaluate.
1
log 10000
Reminder: When a logarithm is written "log" without an explicit base, it refers to the common logarithm,
1

log
logo
log 10000 = 0
No
solution
X
?
A chemist measures the amount of nitrogen gas produced during an experiment. She finds that 77.1 g of nitrogen gas is produced. Calculate the number of
moles of nitrogen gas produced.
Round your answer to 3 significant digits.
mol
x10
x
Read each description in the first column of the table below. If any chemical element with atomic number of 92 or less matches the description, check Yes and
enter the chemical symbol of an element that matches. Otherwise check No in the second column.
Does any element
If you checked yes, give
description
match the
the symbol of an
element
description?
that matches.
An element in Period 6 and Group 2A.
Yes
No
A metalloid in Group 4A.
Yes
No
An alkali metal with a lower atomic
Yes
No
number than barium.
A transition element in Period 5.
Yes
No
An organic chemist measures the temperature T of a solution in a reaction flask. Here is the result.
T= 149.175 °C
Convert T to SI units. Round your answer to 3 decimal places.
K
x10
x
?
Decide whether each proposed multiplication or division of measurements is possible. If it is possible, write the result in the last column of the table.
proposed
Is this
result
x10
multiplication or division
possible?
yes
.
(
1.0 mg 2 ) (0.015 g) = ?
no
x
2
3.0 dL
yes
=?
no
0.10 L
2
yes
32. cm
= ?
00
no
4.0 cm
Decide whether each proposed multiplication or division of measurements is possible. If it is possible, write the result in the last column of the table.
proposed
Is this
result
x10
multiplication or division
possible?
yes

(2.5 dL).(0.20 ) )
no
?
yes
(90g)(10g)7
no
yes
7.0 m).(3.0s)=?
no
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1. 50*10¯³
7.1*10...