Significant Digits and Metric Conversions!

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# Significant Digits and Metric Conversions! - PowerPoint PPT Presentation

Chemistry Unit 4 Review Part 1. Significant Digits and Metric Conversions!. Question 1 - 10. How many significant Digits are in this number: 1422. Answer 1 – 10. 4! All numbers present are between 1 and 9. Question 1 - 20. How many significant digits are in the following number? 200.

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Chemistry

Unit 4 Review

Part 1

Significant Digits and Metric Conversions!

Question 1 - 10
• How many significant Digits are in this number:

1422

• 4!
• All numbers present are between 1 and 9.
Question 1 - 20
• How many significant digits are in the following number?

200

• There is only 1!
• The zeros don’t count because the number doesn’t have a decimal place in it!
Question 1 - 30
• How many significant ZEROs are in the following number?

0.0030050

• 3!
• The captures zeros and the trailing zero are the only ones that are significant!
Question 1 - 40
• What is the length of the following green bar?
• 1.25!
• The 1 and the 2 are in concrete, the 5 can be a different number that is reasonable.
Question 1 - 50
• How many zeros in the following number are NOT significant?

.0005050090

• 3!
• Only the zeros in the beginning of the number do not count!
Question 2 - 10
• Convert the following:

254.3 grams to Kilograms

• .2543 Kg
• The number will get smaller because the unit gets bigger!
Question 2 - 20
• How many milliliters are in the following number?

0.0367 Liters

• 36.7 mL
• The number gets bigger because the unit gets smaller!
Question 2 - 30
• Which weighs more?

4.25 grams of Au or

425 mg of Au

• 4.25 grams does!
• Convert milligrams to grams and you get .425 mg! That is less than 4.25 grams!
Question 2 - 40
• What is the metric prefix that correspond to the following quantity?

10-2

Question 2 - 50
• How many mL are in the following number?

87 DL

• There are 870,000 mL!
• KHD*dcm
Question 3 - 10

212.2 + 26.7 + 402.09

=

• Addition, so look for least # of decimal places!
• 641.0
Question 3 - 20

2.01x102 + 3.014x103

• 3215
• You have to take the numbers out of scientific notation to look at decimal places!
Question 3 - 30
• What is the answer to the following problem?

52.331 + 26.01 – 0.9981

• 77.34
• Watch number of decimal places here! Add and subtract carry least number of decimal places to the answer.
Question 3 - 40
• How many digits after the decimal point should be reported when the following calculation is performed?

199.0354 + 43.09 + 121.2

• There should only be 1 decimal place in this answer!
Question 3 - 50
• How many digits after the decimal place should be reported when the following calculation is performed?

10,434 – 9.3344

• There will not be any decimal places in this number! 
Question 4 - 10
• What is the answer to the following division problem?

12.011 / 6.022x1023

• 1.995x10-23
• We need to look at number of significant digits in the numbers of the problem—least number determines answers sig figs!
Question 4 - 20
• What is the answer to the following problem?

(4.031)(0.082068)(373.1)/.995

• 124
• Remember least # of sig figs will be reported in the answer!
Question 4 - 30
• The answer to the following question should be written with how many significant digits?

2.3733x102/

343

Question 4 - 40
• When the following calculation is performed, the answer should be reported with how many significant digits?

.0043*.0821*298

• 2!
• Remember least goes! 
Question 4 - 50
• What is the answer to the following problem?

(6.1982x10-4)2

• 3.8418x10-7
• Or 3.8000x10 -7
Question 5 - 10
• What is the answer to the following problem?

(2.0944+.0003233*12.22)/7.001

• .2997
• Remember your order of operations!
• Please Excuse My Dear Aunt Sally!
Question 5 - 20
• What is the answer to the following problem?

[(1.42x102)+(1.021x103)]/3.1x10-1

Question 5 - 30
• Consider the following numbers 23.68 and 4.12.
• The sum of these numbers has how any significant digits?
• The product of these numbers has how many significant digits?