Chemistry, 27.11.2019 05:31, falmujaahid026
1. the number 0.004207, when rounded off to 3 significant figures, would appear as
0.00421 b) 0.0042
c) 0.00420 d ) 0.00400
2. in which of the following pairs of numbere does cach member of the pair contain the same number of
significant figures?
a) 0.0806 and 960,000
b) 71.0 and 81.00
c) 20.0 and 462
d) 0.03070 and 0.0670
3. the "mathematical meaning" associated with the metric system prefixes milli, micro and nano is, respecti
a) 10-2, 10-4, and 10-6
b) 10-2, 10-3, and 10-6
c) 10-3, 10-9, and 10-12
d) 10-3, 10-6, and 10-9
in which one of the following measured numbers are all of the zeros significant?
a) 0.00480
b) 0.300120 c) 6.080110 d) 99,400
5. when a substance undergoes a physical change it is always true that
a) it changes color
b) it changes state
c heat is absorbed
d) its chemical composition changes
6. object a weighs 40 grams and has a volume of 5 ml. object b weighs 12 grams and has a volum
therefore,
a) a and b have equal densities.
b) b is twice as dense as a.
c) b is four times as dense as a.
d) a is more dense than b.
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1. the number 0.004207, when rounded off to 3 significant figures, would appear as
0.00421 b)...
0.00421 b)...
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