Post on 31-Dec-2015
description
The following lesson is
one lecture in a series of
Chemistry Programs
developed by
Professor Larry ByrdDepartment of Chemistry
Western Kentucky University
Excellent Assistance has been provided by:
Ms. Elizabeth RomeroMs. Kathy Barnes
Ms. Padmaja PakalaMs Sathya Sanipina
CHECK TEST #1 ANSWERS
Scientific Notation (Part 5)
1. Give the following in scientific notation. Also, write each in correctly written
computer form!A. 648 = ?
Step #1: 648
Step #2: 648.
Step #3: 648. Step #4: 6.48 x 10+2
Step #5: 6.48 x 102
Step #6: Computer form =
* Notice, that we “never” place a positive sign for the exponent in
the computer form
Always in step #1 on your paper rewrite the given problem just as it was given!
1. Give the following in scientific notation. Also, write each in correctly written
computer form!
B. 0.00162 = ?
Step #1: 0.00162
Step #2: 0.00162
Step #3: 1.62 x 10-3
Step #4: Computer Form =
Always in step #1 on your paper rewrite the given problem just as it was given!
1. Give the following in scientific notation. Also, write each in correctly written
computer form!
C. 96,000,000 (as two significant figures)
Step #1: 96,000,000 Given
Problem
Step #2: 96,000,000.
Step #3: 9.6 x 10+7
Step #4: 9.6 x 107
Step #5: Computer Form =
1. Give the following in scientific notation. Also, write each in correctly written Scientific Notation computer form!
D. 30,000,000,000 x 10-4 (as one significant figure)
Step #1: 30,000,000,000 x 10-4
Step #2: 30,000,000,000. x 10-4
Step #3: 3 x 10+10 x 10-4
Step #4: 3 x 10(+10) + (-4)
Step #5: 3 x 10+6
Step #6: 3 x 106
Step #7: Computer Form:
1. Give the following in scientific notation. Also, write each in correctly written Scientific Notation computer form!
E. 0.00468 x 10-3 (as three significant
figures)
Step #1: 0.00468 x 10-3
Step #2: 0.00468 x 10-3
Step #3: 4.68 x 10-3 x 10-3
Step #4: 4.68 x 10(-3) + (-3)
Step #5: 4.68 x 10-6
Step #6: Computer Form = 4.68E-6
1. Give the following in scientific notation. Also,write each in correctly written Scientific Notation computer form!
F. 94.6 x 10-4 (as three significant figures)
Step #1: 94.6 x 10-4 Given Problem
Step #2: 94.6 x 10-4
Step #3: 9.46 x 10+1 x 10-4
Step #4: 9.46 x 10(+1) + (-4)
Step #5: 9.46 x 10-3
Step #6: Computer Form = 9.46E-3
2. Convert the following into conventional numbers (every-day-way-of-writing-numbers). If part of the number is in scientific notation form, then you must get all the given problem into correctly written scientific notation form before converting it back into its conventional number.
A. 7.82 x 10-4
Step #1: 7.82 x 10-4
Step #2: 00007.82 x 10-4
Step #3: 0.000782
B. 9.34 x 103
Step #1: 9.34 x 103
Step #2: 9.340 x 10+3
Step #3: 9340
2. Convert the following into conventional numbers (every-day-way-of-writing-numbers). If part of the number is in scientific notation form, then you must get all the given problem into correctly written scientific notation form before converting it back into its conventional number.
C. 0.00381 x 10-2
Step #1: 0.00381 x 10-2
Step #2: 0.00381 x 10-2
Step #3: 3.81 x 10-3 x 10-2
Step #4: 3.81 x 10(-3) + (-2)
2. Convert the following into conventional numbers (every-day-way-of-writing-numbers). If part of the number is in scientific notation form, then you must get all the given problem into correctly written scientific notation form before converting it back into its conventional number.
2. Convert the following into conventional number (every-day-way-of-writing-numbers). If part of the number is in scientific notation form, then you must get all the given problem into correctly written scientific notation form before converting it back into its conventional number.
Step #5: 3.81 x 10-5
Now you convert 3.81 x 10-5 back into its convention number form
Step #6: 000003.81 x 10-5
Step #7: 0.0000381
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
A. (6.20 x 10-2) (3.00 x 10-1) = ? [Answer as 3 significant figures]
Step #1: (6.20 x 10-2) (3.00 x 10-1) Given problem
Step #2: (6.20) (3.00) x 10-2 x 10-1 Collect Similar
Terms
Step #3: 18.600 x 10(-2) + (-1) Next, Round-off
Step #4: 18.6 x 10-3
Important Note: If one part of the problem is given as a fraction then all parts must be converted into fraction forms and then treat it as a large fraction.
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
Step #5: 1.86 x 10+1 x 10-3
Step #6: 1.86 x 10(+1) + (-3)
Step #7: 1.86 x 10-2
Step#8:ComputerForm=1.86E-2
Important Note: If one part of the problem is given as a fraction then all parts must be converted into fraction forms and then treat it as a large fraction.
B. (0.514 x 10-3)(4.20 x 103) (answer as 3 significant figures)
Step #1: [ 0.514 x 10-3 ] [ 4.20 x 103 ] Given Problem
Step #2: [ 0.514 x 10-3 ] [ 4.20 x 10+3 ]
You must get each part first into Scientific Notation
Step #3: ( 5.14 x 10-1 x 10-3 ) ( 4.20 x 10+3 )
Step #4: ( 5.14 x 10(-1)+(-3) ) ( 4.20 x 10+3 )
Step #5: ( 5.14 x 10-4 ) ( 4.20 x 10+3 )
Step #6: ( 5.14 ) ( 4.20 ) x 10-4 x 10+3 Collect similar terms
Step #7: 21.588 x 10(-4) + (+3) Round-off and add exponents algebraically
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
Step #8: 21.6 x 10-1
Step #9: 2.16 x 10+1 x 10-1
Step #10: 2.16 x 10(+1)+(-1)
Step #11: 2.16 x 100
Step #12: 2.16
Step #13: Computer form = 2.16
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
C. (124,000) (48.1) (12.0) (1.00) (Answer as 3 significant figures)
Step #1: (124,000) (48.1) (12.0) (1.00) Given Problem
Step #2: (1.24 x 10+5) (4.81 x 10+1) (1.20 x 10+1) (1.00)
Step #3: (1.24) (4.81) (1.20) (1.00) x 10+5 x 10+1 x 10+1
Multiply first parts and then add the exponents algebraically.
Step #4: 7.15728 x 10(+5) + (+1) + (+1)
Next, Round-off !
Step #5: 7.16 x 10+7
Step #6: 7.16 x 107
Step #7: Computer Form = 7.16E7
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
Step #1:
684
2.0 6.87
Given Problem
Step #2:
684
2.0
1
6.87
Convert each part into a fraction
D.
684
2.0 6.87
= ? [Answer as 2 significant figures]
3. Use scientific notation to work the following problems: "Do" all work in scientific notation! Give "ALL" answers in scientific notation!
You cannot do any steps-in-your-head !You must show every step you use on your sheet of paper!
Step #3:
684 1
2.0 87.6
Convert into one large fraction
Step #4:
210 x 6.84 1
2.0 110 x 8.76
Step #5:
210 x 84.6
110 x 2.0 76.8
Collect similar terms
Convert all to scientific notation forms
Step #6: 210 x 84.6
110 x 7.5201
First Round-off the Numerator Part
Step #7: 210 x 84.6
110 x 8.1
Next, convert 18. into 110 x .81
Step #8: 210 x 84.6
110 x 110 x .81
Step #9: 210 x 84.6
1 1
10 x .81
Add exponents algebraically
Step #10: 210 x 84.6
210 x .81
Step #11: 210
210 x
84.6
8.1
Collect Similar Terms
Step #12:
2 2
10 x 0.2631578 Round-off and then Subtract exponents algebraically
Step #13:
2- 2
10 x 0.27 Add exponents algebraically
Step #14: 010 x 0.27
Step #15: 0.27
Step #16: 1-10x 2.7 Step #17: Computer Form = 2.7E-1
E. 310 x 2.00 410 x 4.00 (as 3 significant figures)
Step #1: 310 x 2.00 410 x 4.00 Given Problem
Step #2: 310 x 2.00
410 x 4.00
Rewrite in correct fraction form
Also, add the +’s to the positive exponent
Step #3: 310
410 x
00.2
00.4
Collect Similar Terms
Step #4:
3 - 4
10 x 00.2 Subtract exponents algebraically
Step #5:
3 4
10 x 00.2 Add exponents algebraically
Step #6: 110x 2.00
Step #7: 110x 2.00
Step #8: Computer Form = 2.00E1
F. 1-10 x 4.61
3-10 x 68.0 (as 3 significant figures)
Step #1: 1-10 x 4.61
3-10 x 68.0 Given Problem
Step #2: 1-10 x 4.61
3-10 x 110 x 6.80
Step #3: 1-10 x 4.61
3-1
10 x 6.80
Add exponents algebraically
Step #4: 1-10 x 4.61
210 x 6.80
Step #5: 110
-210 x
61.4
80.6 Collect similar terms
Step #6:
1- - 2-
10 x 1.4750542 Round-off and then Subtract exponents algebraically
Step #7:
1 2-
10 x 1.48 Add exponents algebraically
Step #8: 1-10x 1.48
Step #9: Computer Form = 1.48E-1
G.
1- 10 x 4.20
1.00 4 10 x 3.00 3- 10 x 6.20 (as 3 significant figures)
Step #1:
1- 10 x 4.20
1.00 4 10 x 3.00 3- 10 x 6.20 Given problem
Step #2:
1- 10 x 4.20
1.00
1
4 10 x 3.00
1
3- 10 x 6.20
Step #3:
10 14.20 1 1
410 x -310 x 1.00 3.00 20.6
Collect Similar Terms
Convert All Parts into fractions
Step #4: 1-10 x 4.20
410 x -310 x 8.601
Round-off to 3 significant figures
Step #5: 1-10 x 4.20
4 3-
10 x 8.61
Add exponents algebraically
Step #6: 1-10 x 4.20
110 x 8.61
Rewrite 18.6 as 1.86 x 10+1
Step #7: 1-10 x 4.20
110 x 110 x 86.1
Step #8:
1-10 x 4.20
1 110 x 86.1
Step #9: 1-10 x 4.20
210 x 86.1
Step #10: 110
210 x
20.4
86.1
Collect Similar Terms!
Step #11: 1 - 2
10 x 0.4428571
Round-off and then Subtract exponents algebraically
Step#12: 1 2
10 x 0.443
Add exponents algebraically
Step #13: 310 x 0.443
Convert 0.443 into 1-10 x 4.43
Step #14: 310 x 1-10 x 4.43
Step #15:
3 1-
10 x 4.43
Step #16: 210x 4.43
Step #17: 210x 4.43
Step #18: Computer Form = 4.43E2
H.
2 10 x 0 10
4 10 x 111 0
-7
10 x 4 16 2-
10 x 0641 0
4- 10 x 610
.
. . .
. (as 3 significant figures)
Step #1:
2 10 x 0 10
4 10 x 111 0
-7
10 x 4 16 2-
10 x 0641 0
4- 10 x 610
.
. . .
. The given problem!
Step #2:
210 x
110 x 1.00
410 x
1-10 x 1.11
1
-710 x
110 x 1.64
2-
10 x 2-
10 x 6.41
4-10 x
110 x 06.1
Step #3:
2 1
10 x 1.00
41-
10 x 1.11
1
7- 1
10 x 1.64
2- 2-
10 x 6.41
4- 1
10 x 06.1
Step #4:
310 x 1.00
310 x 1.11
1
610 x 1.64
410 x 6.41
310 x 06.1
Step #5:
3
10 x 1.00 1 4-
10 x 6.41
3
10 x 1.11 -6
10 x 1.64 3-
10 x 1.06
Step #6:
310 x
4-10 x 1.00 1 6.41
310 x
-610 x
-310 x 1.11 1.64 1.06
Collect Similar Terms
Convert into one large fraction
Step #7:
3 4-
10 x 41.6
3 6- 3-10 x 1.929624
Step #8: 1-10 x 6.41
-610 x 1.93
Step #9: 110
-610 x
41.6
93.1 Collect Similar Terms!
Step #10: 1- 6-
10 x 0.301092
Round-off and then Subtract exponents algebraically
Round-off and then Add exponents algebraically
Step #11: 1 6-
10 x 0.301
Add exponents algebraically
Step #12: 5-10 x 0.301
Step #13: 5-
10 x 1-
10 x 3.01 Convert 0.301 into 1-10 x 3.01
Step #14: 3.01 x 10(-1)+(-5)
Step #15: 3.01 x 10-6
Step #16: Computer Form = 3.01E-6
YOU HAVE COMPLETED JUST
PART –V OF
SCIENTIFIC NOTATION