chapter 2

Question 1

scientific notation

Answer 1

a coefficient with only one digit before the decimal times a multiplier that is raised to an exponent
(exa: 2.14x10^-3)

Question 2

anything raised to the 0th power

Answer 2

=1

Question 3

how does the decimal move when x by 10^n

Answer 3

if n is positive, it moves n places to the right
if n is negative it moves n places to the left
(for a big number exponent is positive, for a very small number, exponent is negative)

Question 4

common metric prefixes

Answer 4

tetra- 10^12
Giga- 10^9
mega- 10^6
Kilo- 10^3
deci- 10^-1
centi- 10^-2
milli- 10^-3
micro- 10^-6
nano- 10^-9
pico-10^-12

Question 5

Accuracy vs precision

Answer 5

accuracy
-how reliable are the measurements?
-do they reflect the true value?
precision
-how finely are the measurements made?
-how closely are they grouped together?

Question 6

significant digits

rules

Answer 6

indicate how precisely we know a measurement

1) all non zero digits are significant and all zeros between non zero digits are significant
2) if a decimal point is present, zeros to the right of the last non zero digit are significant
3) zeros to the left of nonzero numbers are never significant
4) if there is no decimal point present, zeros to the right of the last nonzero may or may not be significant

Question 7

converting between Fahrenheit and celsius

Answer 7

F=(9/5)C+32

C= (5/9)F-32