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CHM1025 Exam 1/186 Questions and Answers
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CHM1025 Exam 1/186 Questions and Answers
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CHM 1025 Exam 1/10 Q’s and A’sKnow the most commonly used Metric prefixes. - -kilo k 1000 103
deci d 0.1 101
centi c 0.01 102
milli m 0.001 103
micro m 0.000001 106
nano n 0.000000001 109
km 10^3
m 10
dm 10^-1
cm 10^-2
mm 10^-3
um 10^-6
nm 10^-9
-Know how to convert from Centigrade to Fahrenheit and from Fahrenheit to
Centigrade. - -Tf=1.8Tc+32
K=273+C
All you need to know
-There are two Metric conversions. - -...
-Know how to express a number in scientific notation. - -595mg > .595g >
5.95 x 10^-1g
-Significant Figures - 4 questions. - -Rules.
1. All non-zero numbers are significant.
2. Zeros between non zero digits are significant
3. Zeros at the beginning of a number are not significant
4. Zeros at the end of a number are only significant if the number has a
decimal point.
5. Exact numbers have unlimited number of significant figures.
Rounding- Discarding non significant figures
For multiplication and division, look at all the numbers invlovled in the
calculations and find the number having the fewest number of significant
figures. Round that answer to that many significant figures.
For addition and subtraction, all the numbers including the answer have to
contribute to the same decimal place. Discard by rounding all other figures
after computation
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