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safety video 19

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1261
01:43

safety video 18

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00:47

safety video 5

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safety video 13

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1250
00:51

safety video 15

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1239
00:28

safety video 9

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1239
00:42

Grams to Moles and Moles to molecules

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1237
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Percent concentration by volume

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1234
01:00

Safety Video 4

beamanb
1229
01:37

Into to the periodic table

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1202
06:46

Percent concentration by mass

beamanb
1201
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Grams to moles

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1195
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safety video 6

beamanb
1184
00:51

How to classify matter

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1114
04:22

Air Pollution Part 2

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753
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Air Pollution Part 3

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753
06:06

Flex Introduction 9.5

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736
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Air Pollution Part 4

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730
08:45

Air Pollution Part 1

janesm
730
07:18

Air Pollution Animation 1

janesm
697
00:37