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Chemistry 1025 Lab Final Exam Questions and answers
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Chemistry 1025 Lab Final ExamQuestions and answers
Accuracy - -Measurement of how close a result comes to the true value.
Sometimes involves calibration with. A known standard
-Precision - -Measure of the agreement between 2 or more measurements
that are averaged to give reported value.
-Dependent variable - -Quantity that changes in response to changes of
independent variable
-Independent Variable - -The quantity under control that determines the
value of other variables. Changed to observe its effect on others.
-Physical properites - -Determined w/out changing the chemical identity
-List Physical properties - -States of matter. Color. Shape. Volume. Density
-Chemical properties - -Determined by the chemical changes the substance
can undergo
-List chemical properties - -Flammability. Enthalpy. Stability. Rusting.
-Pure substance - -Has some intensive properties throughout and cannot be
separated into 2 or more substances. Except by means of a chemical
reaction
-Mixture - -A material composed of two or more substances
-Hydrates - -Any substance that has water molecules incorporated in its
structure.
-Charles law - -A law that states that the volume of a gas is directly
proportional to the temperature of the gas. (Pressure and ,mols are constant)
-Boyles law - -Law stating that volume of gas varies inversely w pressure.
( temperature and moles are constant)
-Titration - -The process of adding a solution from a buret to a sample until
a reaction is complete at which time the volume is accurately measured and
the concentration of the sample is calculated
-Strong acid or base - -Ionize completely in solution
, -Weak acid or base - -Produce hydroxide and hydromium ion concentration
that are very small compared to the concentration of the acid or base
themselves.
-AnHydrous salt - -Moles of the salt without water of hydration, when
heated and water evaporates completely.
-How many significant figures?
a. 0.003
b. 1.00
c. .03600
d. 23700 - -1, 3, 4, 3
-How many significant figures
a. 5681.05
b. 00.924300
c. 00.0500 - -6, 6, 3
-How do you determine the unknown substance in exp 3 - -Solubility ,
density and boiling point.
-Calculate the molarity starting with a gram amount of salt (36 grams of
NaCl) and a specific volume ( 250 ml of water) - -- convert NaCl to mols (by
equation 1 Mol over molar mass of Nacl )36g NaCl x (1mol/ 58.5 g NaCl )
-then take the Mols of NaCl in the solution answer and divide by liters. 250
ml equals .250 L.
.615Mols of NaCl / .250 L = 2.46 M of NaCl
-Balance chemical equation
CO2+H2O ---> C6H12O6 + O2 - -6CO2+6H2O ---> C6H12O6 + 6O2
-Stoichiometric calculations from balanced equation. Find how many grams
of O2 and H are produced from the 2 grams of H and 10 grams of O2
2H2+O2--->2H2O - -2 gH2x 1mol h2/ 2g H2 x 1 mol O mol H2x 32g O2/
1mol O2 = 16 g O2
Then
10gO2 X 1 molO2/ molar mass of O2 (32 g)x 2 mol H2o/ 1 g H2O x 18 g H2O/
1 mol H2O= 11.25 g H2O
-How do you calculate density of an irregularly shaped object? - -Fill
graduated cylinder. Measure the volume. Place the object into the graduated
cylinder. Measure the volume again. The difference before and after is the
volume of the object. Weigh the object and get the grams. D =m/v
-Predict the product of this equation and determine the precipitate.
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