Scientific Method
What are theories?
Models that explain and give the underlying causes for observations and laws.
Find V in D = m/V
V = m/D
When multiplying these 3 measurement, the final answer will have this many sig figs: (2.345 cm x 300 cm x 45.0 cm)
1 SF
If the exponent is positive what does that mean?
The decimal number gets bigger/multiplied by 10 n times
162.3 - 144.32 +8
26
An educated guess or prediction is called a......
Hypothesis
Convert 200 kg to pounds (lb) (Show work)
440.92 lbs
Trailing zeros at the end of a number are what...
Ambiguous
If an exponent is negative what does that mean?
The decimal number gets smaller/multiplied by 10 -n times
9199-32.8+8.99
9175
True or false: An example of an observation is when a can of soda pop is opened, a fizzing sound is heard.
True
Convert 250°F to °C. Remember Sig Figs
120°
Are exact numbers used to determine the number of sig figs?
NO
Change to Standard Form...
3.51 x 10-3
0.00351
(5.01*3.21*5)/3.0001
30
What step is this: Matter is neither created nor destroyed in a chemical reaction
Law
44 mm = __________ nm
*Answer MUST be in scientific notation to get the points!
4.4 x 10 7 nm
(44,000,000)
How many SF: 1700.00208
9 SF
Convert to scientific notation: 670000000
6.7×108
(5.235 / 3.253) / 35.325
0.04556
Classify each statement as an observation, a
law, or a theory:
(a) When a metal is burned in a closed container,
the mass of the container and its contents does
not change.
(b) When wood is burned in a closed container, its
mass does not change.
(c) Matter is conserved in chemical reactions.
(d) Matter is made of indestructible atoms
(a) Observation
(b)Observation
(c) Law
(d) Theory
A car travels at a speed of 72 km/h. What is its speed in meters per second (m/s)? (Show work)
20m/s
How many SF in 2.9 x 105
2
Convert 0.000000345 into scientific notation
3.45×10−7
(2.34 x 10^3)×4.56
1.07 x 104