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Thursday, September 13, 2012. nde-ewo (pronounced enday aywo). Turn in your Density Lab in the basket by the calculator caddy Get a calculator Take out a sheet of notebook paper. Express the following to the correct number of significant figures 334.54 g + 198 g 34.1 grams / 1.1 mL - PowerPoint PPT Presentation
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nde-ewo(pronounced enday aywo)
• Turn in your Density Lab in the basket by the calculator caddy
• Get a calculator• Take out a sheet of
notebook paper
• Express the following to the correct number of significant figures
a) 334.54 g + 198 g
b) 34.1 grams / 1.1 mL
c) 2.11 x 103 joules /34 sec
d) 30 000 km/24.2600 hrs
e) 1.45 mL – 0.0003 mL
Thursday, September 13, 2012
Check Yourself
1. 533 g
2. 31 g/mL
3. 62 joules/sec
4. 1000 km/hr
5. 1.45 mL
GraphingGraphing is an important tool for expressing data so that it is easier to read and interpretRules for graphing:--place the manipulated/independent variable (the one that was changed) on the x axis.--place the dependent/responding variable (the results of that change) on the y axis.(dry mix)
DRY
MIX
y scale = largest y value – smallest y value x scale = largest x value – smallest x value# of lines on the y axis # of lines on the x axis
The graph should cover at least ¾ of the grid
Rules:
• Each person will have their own paper.
• Answer must be written correctly on your paper
• Use appropriate units (where it applies)
Question #1
• Roll the die then round to the correct number of significant figures in the following:
a) 0.58742005
b) 30 024 589
Question #2
• Roll the die then round to the correct number of significant figures in the following: :
a) 900007.0
b) 0.20470810
Question #3
• Calculate. Express your answer in the proper # of significant figures.
a) 1.44 m X 2.467 m =
b) 7082 ÷ 42 =
Question # 4
• Calculate. Express your answer in the proper # of significant figures or decimal places.
a) 7182 ÷ 52 =
b) 55.46 g – 36.2 g =
Question # 5
• Express in standard scientific notation.
a)0.00382
b)456 3000
Question # 6
• Express in normal notation.
a)4.53 X 105
b)2.1 X 10-4
Question #7
• Draw the metric conversion grid.
( Hint…King Henry….)
Question # 8
• Calculate density. Show all steps and units.
mass 537 g, volume 1002 mL
Question #9
• Calculate mass. Show all steps and units.
density 7g/mL, volume 222 mL
Question # 10
• Calculate volume. Show all steps and units.
density 3 g/mL, mass 2100 g
Question # 11
• What is the difference between accuracy and precision?
Question #12
• Tell if the following data is accurate, precise, both or neither.
A nail has a length of 3.04 cm.Measurements recorded were:
2.01, 2.02, 2.01, 2.03
Question #13
• Give the appropriate unit to measure the following:
a) The weight of a minivan
b) The volume of gas in a car’s tank
Question #14
• Give the appropriate unit to measure the following:
a) The length of a bar of soap
b) The volume of a tube of toothpaste
Question # 15
Answer the following questions:
a)How many decigrams are in a hectogram?
b)How many centimeters are in a kilometer?
Question # 16
The lines in the picture just touch the rim of the penny. Record the diameter of the penny in centimeters, recording the correct number of significant figures.
Answers
Question # 1
You rolled a…
Your answer should be
1 0.6
2 0.59
3 0.587
4 0.5874
5 0.58742
6 0.587420
a) b)
You rolled a…
Your answer should be
1 30 000 000
2 3.0 x 10 7
3 3.00 x 10 7
4 30 020 000
5 30 024 000
6 30 024 600
Question # 2
You rolled a…
Your answer should be
1 900000
2 9.0 x 10 5
3 9.00 x 10 5
4 9.000 x 10 5
5 9.0000 x 10 5
6 900007
a) b)
You rolled a…
Your answer should be
1 30 000 000
2 3.0 x 10 7
3 3.00 x 10 7
4 30 020 000
5 30 024 000
6 30 024 600
Question #3
a) 3.55 m
b) 170
Question #4
a) 140
b) 19.3
Question #5
a) 3.82 x 10 -3
b) 4.563 x 10 6
Question #6
a) 45300
b) 0.00021
Question #7
k h da BASE d cm
kilo hecto deka deci centimilli
Question #8
D = m/V = 537 g/1002 mL= 0.536 g/mL
Question #9
M = DV = (7 g/mL)(222 mL) = 2000 g
Question #10
V = m/D = 2100 g/ (3 g/mL) = 700 mL
Question #11
Accuracy: how close values are to the known (true) value
Precision: how close values are together
Question #12
Precise
Question #13
a) kg
b) L
Question #14
a) cm
b) mL
Question #15
a) 1000 or 103
b) 100 000 or 105
Question #16
1.92 cm
(make sure your answer has a 100ths place value; it doesn’t have to be a 2)