Regents Review June 11
Presentation
•
Chemistry
•
11th - 12th Grade
•
Medium
Standards-aligned
NAUDIA LAWRENCE
Used 4+ times
FREE Resource
27 Slides • 15 Questions
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Regents Review June 11
By NAUDIA LAWRENCE
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Significant figures review
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Significant Figures Rules
All non zero numbers are significant (1,2,3 etc)
Leading zeros are never significant - even with a decimal.
Zeros between numbers are significant
Trailing zeros are not signicant unless there is a decimal
If there is a decimal count all zeros that are not in front
Subject | Subject
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o.ooo234
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3040
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23400
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23400.0
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23400.0
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23400.010
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0.01020
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Multiple Choice
How many significant figures does the following number have: 0.002040
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4
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2
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Multiple Choice
How many significant figures does the following number have: 0.998005
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Multiple Choice
How many significant figures does the following number have: 100.00210
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Multiple Choice
How many significant figures does the following number have: 100.3
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2
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Multiple Choice
How many significant figures does the following number have: 56.040
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Nuclear Chemistry - Half life calculations
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You might be asked 1 of three things
Total amountbof substance
the amount remaining after a certain time
half life (# of them or amount of actual time)
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Always draw it out
total amount
amount remaining
half life
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Multiple Choice
A radioactive isotope has a half-life of 2.5 years. Which fraction of the original mass remains unchanged after 10. years?
1/2
1/4
1/8
1/16
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Multiple Choice
What fraction of a Sr-90 sample remains unchanged after 87.3 years?
1/2
1/4
1/3
1/8
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Check Table N
Find number of half lives
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Multiple Choice
What is the total number of years that must pass before only 25.00 grams of an original 100.0-gram sample of C-14 remains unchanged?
(1) 2865 y
(2) 5730 y
(3) 11 460 y
(4) 17 190 y
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Find on Table N
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Also use table N to find the decay mode (type of radiation)
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Multiple Choice
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Multiple Choice
Which radioisotopes have the same decay mode and have half-lives greater than 1 hour?
(1) Au-198 and N-16
((2) Ca-37 and Fe-53
3) I-131 and P-32
(4) Tc-99 and U-233
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Replace this with a header
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Multiple Choice
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Balance top and bottom numbers
DONT FORGET TO CHANGE ELEMENT
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ISOMERS REVEIW
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Multiple Choice
The isomers butane and methylpropane have
(1) the same molecular formula and the same properties
(2) the same molecular formula and different properties
(3) different molecular formulas and the same properties
(4) different molecular formulas and different properties
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Regents Review June 11
By NAUDIA LAWRENCE
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