The Basics
Hypothesis
Name the (3) building blocks of matter.
Atoms, Elements and Compounds
Data that is desriptive
Qualitative
What is the equation used to calculate density?
D = m/v
Significant figures are used to maintain ______________ within an experiment/lab.
A student conducts a lab and does three trials. Their results for Trial 1--2.63 g, Trial 2--2.70g, and Trial 3--2.66g. The goal for the lab was to reach 2.00g. Is the student accurate, precise, both or neither? Explain.
Precise--all data is close together
You are given an unknown liquid to examine. You note that the substance has a mass of 33.6 g. What type of property did you record.
Extensive
Name the unit associated with the following SI measurements:
a) Mass
b) Temperature
c) Luminous Intensity
a) g or kg
b) K
c) cd
Why can a percent error calculation never be a negative value?
The absolute value brackets located at the top of the fraction.
Tell how many sig figs are in the following numbers:
a) 6.003
b) 176
c) .00045
a) 4
b) 3
c) 2
Theoretical
You boil a solution and after evaporation occurs there is a solid left in the bottom of the evaporating dish. This would be an example of a _____________ change.
Physical
Give two examples of a derived unit.
Newtons, Pascals, Density, Volume, Area, etc.
D= ?
m = 45.66 g
V = 13.005 mL
What is the density?
D = 3.511 g/mL
Name two ways that zeros can be turned from place holders into significant figures.
2) Underlining
1) Basic Research
2) Applied Research
3) Technological Development
*Examples will vary
How can you differentiate between a solid and a liquid.
Solids--definite shape and volume
liquid--definite volume/indefinite shape
Convert the following using the metric ladder:
a) 55.6 cm = ____________________ nm
b) 200.3 mg = __________________hg
a) 556,000,000 nm
b) .002003 hg
D = 1.87 g/cm3
m = 40.03 g
V = ?
Calculate the volume.
V = m/D
V = 21.4 cm3
Round the number 0.000369845 to (3) sig figs
0.000370
Name what type of element each of the following are:
a) Mo
b) Xe
c) As
d) K
a) Metal
b) Noble Gas
c) Metalloid
d) Metal
Name (2) mixtures and (2) pure substances we have used in recent labs.
*Answers will vary
Conversion Factors:
1m = 3.28 ft
1 ft = 12 in
1 inch = 2.54 cm
How many meters are in 55.6 inches?
inches-->feet-->meters
= 1.41 m
A student conducts a lab and finds a mass for a substance of 221.6 g. The volume of the same substance is 153 mL. The students were give a correct Density of 1.30 g/mL. What was the students percent error for this lab?
1) Must find their density.
D= 1.45 g/mL
2) Calculate Percent Error:
(A- E)/A x 100 = 11.5%
When adding or subtracting significant figures, what is the rule you must follow?
Keep the right-hand column they all have in common