# Shared Flashcard Set

## Details

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

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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