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Biology Lab- Quiz 1
Biology 105 (Lab)
26
Biology
Undergraduate 1
09/21/2010

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Term
Probability < 0.05
Definition
There is a significant difference between the samples/treatments
Term
Alternative Hypothesis
Definition
(H1) There is a difference
Term
Null Hypothesis
Definition
(H0)A statement of no difference or no relationship between variables, and it represents what you assume to be true
Term
Solutions
Definition
Homoegenous mixtures that are composed of a solute and a solvent
Term
Solute/Solvent
Definition
A solute is dissolved in a solvent; Ex. Sugar is a solute that is dissolved in coffee, the solvent
Term
Concentration
Definition
The amount of solute in a solvent represents its concentration
Term
Concentrations can be expressed using what four terms?
Definition
Molality, Molarity, Percentage, and Normality
Term
Percent desired formula
Definition
Grams required=(% desired)* volume desired in mL/100 mL
Term
Molarity of a solution
Definition
The number of moles of solute per liter of solution
Term
Molecular Weight
Definition
The sums of the atomic weights of the substance
Term
Formula for the amount of solute required to prepare a molar solution
Definition
Grams required=MW(g/M)*Volume desired in L*Molarity desired
Term
Formula for dilutions
Definition
c1v1=c2v2
Term
pH
Definition
Hydrogen Ion concentration
Term
pH Scale
Definition
1-6 Acidic; 7 Neutral; 8-14 Basic
Term
How to calculate pH
Definition
-log(H+)
Term
POH
Definition
14-pH
Term
Formula for buffering capacity
Definition
B=(volume of a/b in mL)*(normality of a/b) /
(volume of sample in mL)*(pH change)
Term
Chemical indicators
Definition
used to detect molecules in a solution
Term
Silver Nitrate (AgNO3) is used to precipitate what?
Definition
Halide Ions (Cl, Br, I)
Term
Spectrophotometer
Definition
used to measure the amount of light absorbed by a molecule in a solution
Term
Blank
Definition
"0's" the spectrophotometer
Term
O-dianisidine
Definition
Detects Glucose by a brown color
Term
Biuret
Definition
Detects proteins; turns lavender
Term
I2KI
Definition
Detects Starch; turns blue/blue-black color
Term
(DAF)
Definition
Detects iron; turns blue
Term
Sodium Hydroxide (NaOH)
Definition
Detects Calcium Ion; White precipitate
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