Science Methods
A tentative, testable statement about an observation is called a…
Hypothessi
How many significant figures are in 60,800 g?
3
How close multiple measurements are to each other.
Precision
A ratio of mass of an object to its volume.
Density
How to convert from Fahrenheit to Kelvin.
Convert F to C, then C to K.
Not a direct formula for F -> K.
In the measurement 72.34 m, the ___ is the uncertain (estimated) digit.
4
How many significant figures are in 0.0087 m?
2
1 cm3 = ?
1 mL
Convert 23,000 to scientific notation.
2.3x104
An absolute temperature scale (no negative values)
Kelvin
Acting without bias, prejudice, or personal interpretation means acting…
Objectively
How many sig figs are in 125.00 kg?
5
A branch of Chemistry dealing with matter and processes of living organisms.
Biochemistry
(14x10-8) x (23x104) = ?
0.032
or
3.2x10-2
350 mm = ? m
0.35 m
This concept attempts to
-Produce new technology to make living in this world easier.
-Explore phenomena that occur in the natural world.
-Provide us with explanations of how nature works.
Science!
Multiply 4.6 cm × 12.5 cm. Report with correct sig figs.
58 cm²
(Answer: 57.5 cm² → 2 sig figs → 58 cm²)
The three SI base units.
Grams, Liters, Meters
A lab experiment determined the density of aluminum foil to be 2.6g/mL
The true value is 2.7g/mL
What is the percent error?
3.7%
40 oC is equal to what temperature in oF?
oF = oC x (9/5) +32
104o
They help explain complex concepts and represent things we cannot see.
Scientific model
Subtract: 23.6 mL – 13.6 mL. Report with correct sig figs.
10.0 mL
Round to least number of decimals from the problem.
Example of a derived value. Cannot be directly measured in the laboratory.
Density
A chunk of metal was found to have a mass of 43.92 g, and a density of 9.008 g/mL. Find and round the volume to the correct S.F.
d = (m/v)
4.876 mL
(43.92g) / (9.008mL) = 4.875666 mL
How many seconds are there in 2.5 days?
Report to the correct # of sig figs.
220,000 seconds (two S.F)
2.5 days x 24 hours/day x 60 minutes/hour x 60 seconds/min = 216,000 seconds