
Unit 1
Authored by M D
Chemistry
10th Grade

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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Non-zero digits are _______ significant
ALWAYS
NEVER
Answer explanation
For example: 326 has 3 significant figues since it has 3 Non-zero numbers
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Zeros between two non-zero digits are NEVER significant
True
False
Answer explanation
Zero's between two non-zero digits are ALWAYS significant. For example: 303 has 3 sig figs since it has a zero in between two non zero digits.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Leadings Zeros are _________ significant
ALWAYS
NEVER
Answer explanation
For example 0.003003 only has 4 sig figs because of the 3's and the two 0's between the 3's
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trailing zeros are not significant even if there is a decimal point.
True
False
Answer explanation
Trailing zeros are significant IF their is a decimal point. For example 30.00 has 4 sig figs while 300 has only one sig fig. The only difference is the decimal point.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Exact numbers have an infinite number of sig figs
True
False
Answer explanation
Ex Counting: 12 bodies -> 12.0 bodies -> 12.00 bodies
Ex Def/Conversions: 1 day=24 hours -> 1 day=24.0 hours -> 1 day= 24.00000 hours
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many sig figs are there?
30.20
1
2
3
4
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many sig figs are there?
2.50 x 106
1
2
3
4
Answer explanation
Scientific Notation Nx10^x: N: follows the rules. But 10^x does not therefore 10^6 is not significant. Therefore it is 3 sig figs
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