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Midterm
CLAB 123
45
Chemistry
Undergraduate 1
03/02/2010

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Cards

Term
Safety goggles must be worn
Definition
At all times
Term
Waste chemicals are to be disposed
Definition
In the properly labeled waste container
Term
Make sure when heating a liquid that there is a
Definition
boiling stone
Term
Eating and drinking is
Definition
Never allowed in the lab
Term
If there is a fire
Definition
Yell fire and alert instructor and pull fire alarm if it is a large fire and evacuate the building
Term
If a person is on fire
Definition
Go to the safety shower
Term
If chemicals spill on your body
Definition
Wash your hands and arms immediately with water or go to the safety shower if the chemicals are on your body and wash your eyes at the eye wash station for 15-30 minutes if chemicals are in your eyes
Term
The uncertainty in electronic measuring tools is
Definition
+/- 1 in the final digit displayed
Term
The uncertainty of a digital thermometer is
Definition
+/- 0.1 degrees C
Term
The uncertainty of a 20 mL cylinder is
Definition
+/- 0.1 mL
Term
The uncertainty of a 400 mL beaker is
Definition
+/- 5 mL
Term
The uncertainty of a burette is
Definition
+/- 0.01 mL
Term
The uncertainty of a thermometer is
Definition
+/- 0.2 degrees C
Term
The uncertainty of a ruler with mm is
Definition
+/- 0.01 cm
Term
In addition and subtraction the amount of significant figures
Definition
Is rounded off to have the same number of decimal places as the number of decimal places in the most uncertain data used
Term
In multiplication and division, the amount of significant figures is
Definition
Rounded off to have the same number of significant figures as the number of significant figures in the measured quantity with the least number of significant figures
Term
If the air inlets of a Bunsen burner is opened, the flame goes from
Definition
Yellow to blue
Term
A solution is added to a burette by
Definition
Holding the burette in an almost horizontal positon and allowing the liquid to run down the side of the burette while rotating the burette alone it long axis to allow the liquid to contact all parts of the inner surface of the burette
Term
Properties whose values depend on the amount of sample or material. Examples are mass and volume.
Definition
Extensive physical properties
Term
Properties whose values are independent of the amount or size of the sample. Examples are pressure and temperature.
Definition
Intensive physical properties
Term
The mass per unit volume. Two extensive variables lead to and intensive one.
Definition
Density d = m/V
Term
Defined for liquids and solids as the ratio of the density of a material divided by the density of water. The temperature of the water is often 4 degrees C. No units.
Definition
Specific gravity SGx = dx/dwater
Term
The volume of a cube is
Definition
V = a^3, a = length of a side of the cube
Term
The volume of a sphere is
Definition
V = 4/3πr^3, r = radius of sphere
Term
The volume of a right cylinder is
Definition
V = πr^2h, r = radius of circular cross section, h = height of the cylinder
Term
To gauge the uncertainty in a volume measurement
Definition
The possible maximum and minimum values for the quantity based on the uncertainty in the original measurements must be calculated
Term
The volume in a graduated cylinder is found by
Definition
Taking the difference between the initial volume and the volume with the object
Term
The largest volume displacement is found by
Definition
Subtracting the largest final volume reading (+0.1) from the smallest initial volume reading (-0.1)
Term
The smallest volume displacement is found by
Definition
Subtracting the smallest final volume reading (-0.1) from the largest initial volume reading (+0.1)
Term
The largest value of the density is found by
Definition
Dividing the largest mass (+0.1) by the smallest volume of liquid delivered (-0.1)
Term
The smallest value of the density of the liquid is found by
Definition
Dividing the smallest mass (-0.1) by the largest volume of liquid delivered (+0.1)
Term
Relative error is
Definition
part per thousand relative error = ((dn - dave)/dave)*1000
Term
Dalton's atomic theory was consistent with
Definition
The experimental laws of definite composition and multiple proportions that gave it great credibility
Term
For mole ratios
Definition
One divides the moles of each component by the number of moles of the component with the lesser or least number of moles
Term
The formula derived from the mole ratios.
Example: 1 mole Fe and 3 moles of Br yields the formula FeBr3
Definition
The empirical formula
Term
The amount of a product formed when 100% of the limiting reactant is converted to product
Definition
The theoretical yield
Term
The amount of a product formed during a chemical reaction
Definition
The actual yield
Term
((actual yield)/(theoretical yield))100
Definition
Percent yield
Term
What is the proper method to separate mixtures
Definition
Using a filter flask, Buchner funnel, aspirator set up
Term
Substances with the ability to react with both acids and bases are
Definition
Amphoteric
Term
Double sulfate salts that contain two different ionic sulfate compounds in a defined ratio. Are typically hydrated compounds containing a stoichiometric amount of water molecules.
Definition
Alum
Term
Compounds with molecules of water involved in their formula. Some of the water molecules in these compounds may be chemically bonded to the metal atoms by coordinate covalent bonds.
Definition
Hydrates
Term
|measured - accepted|/accepted (100%)
Used for accuracy
accepted = true or standard of comparison value
smaller = greatest accuracy
larger = least accurate
Definition
Percent error
Term
Truthfulness or closeness to an accepted value, on average
Definition
Accuracy
Term
Repeatability of successive measurements
Definition
Precision
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