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Molar concentration

Percent composition and mole conversions pt 2 - Notes

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Chemistry
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Chemical properties
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Mole
Molar mass
Molar concentration
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Avogadro constant
Mole fraction

Percent Composition PURPOSE and PROCEDURE To find out the percentage (by mass) of a particular element in a chemical compound. Calculate the molar mass for the compound. Divide the mass of the element you want to find the percentage of by the molar mass of the compound. Write the answer you get from step B in percentage form. Round your percentage to the tenth. EXAMPLES What percent of Cu2O is O? 2 x Cu = 2 x 63.5 = 127.0 g 1 x O = 1 x 16.0 = 16.0 g molar mass = 143.0 grams/mol % O = Part ? Total = 16.0 ? 143 = .1118 x 100% = 11.2% Example What percent of Al2O3 is Al? 2 x Al = 2 x 27.0 = 54.0 g 3 x O = 3 x 16.0 = 48.0 g molar mass = 102.0 grams/mole % Al = Part ? Total = 54 ? 102 = .5294 x 100% = 52.9% Practice - Find the percent composition

Mole conversions - Notes

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Mass
Amount of substance
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SI base units
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Mole
Atomic mass
Molar concentration
Molar mass
Chemistry
Gas constant
Kilogram

Chemical Quantities The MOLE CHAPTER 7 THE MOLE: A MEASUREMENT OF MATTER A mole (mol) is a unit of measurement Types of measurement include Counting/weighing/volume/ number of units Examples of other Quantitative measurement units Pair/Dozen/Ream Mole The term representative particles is a generic term that can refer to Atoms (single element), or Diatomic molecules (two of one type of element), or Formula units (what makes up an ionic compound) or Molecules (what makes up a molecular compound), or electrons or protons, or ions, etc Mole It is typically referred to as a mole of atoms or a mole of molecules A mole is also called Avogadro?s number For example: One mole would be 6.022 x 1023 representative particles Why use moles?

inorganic chemistry lab report : titration

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Household chemicals
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Acetates
Acetic acid
Acid–base titration
Vinegar
Dilution
Acid
Standard solution
Molar concentration

1 Experiment 6: Acid-Base Titration Objective: The objective of this experiment is to determine the percent mass of Acetic Acid in the vinegar (original Acetic Acid) by reacting measured volume of NaOH solution, whose concentration is given by react with standard HCl solution, with measured volume of dilute Acetic Acid solution. In addition, Excel is used in calculation part. Method:

inorganic chemistry lab report: titration

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Chemistry
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Household chemicals
Bases
Titration
Analytical chemistry
Acetates
Acetic acid
Acid–base titration
Vinegar
Dilution
Acid
Standard solution
Molar concentration

1 Experiment 6: Acid-Base Titration Objective: The objective of this experiment is to determine the percent mass of Acetic Acid in the vinegar (original Acetic Acid) by reacting measured volume of NaOH solution, whose concentration is given by react with standard HCl solution, with measured volume of dilute Acetic Acid solution. In addition, Excel is used in calculation part. Method:

inorganic chemistry lab report: Water Hydration

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Chemistry
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Mass
Crucible
Molar mass
Mole
Molar concentration
Mass fraction
Hydrate
Gas constant

1 Experiment 4: Water Hydration Objective: The objective of this experiment is to determine the formula of the hydrate and the percent water in the hydrate by heating the hydrate and dry out the water and determine the mole of water and anhydrate in the hydrate. Method:

Principles of Chemistry I Chapter 3

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Chemistry
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Analytical chemistry
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Stoichiometry
Limiting reagent
Molar concentration
Mole
Molar mass
Amount of substance
C18H37NO2
C10H12O4

Chapter 3 ? Stoichiometry this term refers to mass relationships and changes during a chemical reaction. Mass is conserved, but atoms in product are arranged differently than they are reactants. I) Mole ? A) molecules composed of atoms in definite proportion by mass and in specific ratio: butyric acid has 54.5% C, 36.4% O and 9.1 % H it also has the atoms C/H/O in the ratio 2/4/1 B) Mole is used as a measure of the amount of a substance. 1 mole is the number of 126C atoms in 12.00 g Notice it relates number of atoms to mass of those atoms in grams. It is always 6.02 x 1023 So 6.02 x 1023 atoms of 12C weigh 12.00 g Instead of looking at masses of isotopes, can use average atomic mass of atoms: Find Se on periodic table

Principles of Chemistry Chapter 3

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Equilibrium chemistry
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Dissociation
Aqueous solution
Chemical equation
Mole
solubility
Molar concentration

Chapter 3: Molecules and Chem Equations Section 3.2: Chemical Formulas and Equations Monday, September 8, 2014 2:44 PM Chemical Equations: symbolic representation of a chemical reaction Left side: reactants (original materials) Right side: products (compounds formed from reaction) ? Notation: Reaction w/ heat is indicated by delta Reaction w/ light energy is indicated by hv (called a photochemical reaction) ? Hints: Balance elements that occur in only one compound on each side first Balance free elements last Balance polyatomic ions as groups ? Balancing Chemical Equations Remember LAW OF CONSERVATION OF MATTER Stoichiometry: study of relationships between reactants and products in a chemical reaction (numbers in chem equations are stoichiometric coefficients) ?

Chapter 5b

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Chemistry
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Chlorides
Metal halides
Titration
Silver chloride
Stoichiometry
Molar concentration
Potassium hydroxide
health
behavior
Human development
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Love
Psychoanalysis
Human behavior
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Chemistry 1210: Introduction to General Chemistry Dr. Gina M. Florio 27 Sept. 2012 Jespersen, Brady, Hyslop Chapter 5B Molecular View of Reactions in Aqueous Solution Properties of Solutions: Quantitative Composition The molar concentration or molarity (M) is defined as: units of M = mol/L (mol L-1) Example: How many grams of AgNO3 are needed to prepare 250 mL of a 0.0125 M AgNO3 solution? NOTE: You can also solve this for concentration OR liters of solution CH. 5 Properties of Solutions: Quantitative Composition Solutions of high concentration can be diluted to make solutions of lower concentration. Dilution: CH. 5 Example: How much 1.0 M CuSO4 (aq) solution is required to prepare 250 mL of a 0.10 M CuSO4 (aq) solution? How much water is required? Solution Stoichiometry CH. 5

AP Bio: Potato Osmosis Lab Report

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Biology
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Chemistry
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Solution
Sucrose
Osmosis
Molar concentration
Potato
concentration
Mass
#AP Biology #AP Bio #Biology

As visible from the data presented in the table and graph, the mass change in percent seems to decrease as the sucrose concentration increases. There seems to be minimal percent change of mass between 0.7M and 0.8M. Conclusions/Discussion After carefully recording data, we extrapolated that there is an inverse relationship between sucrose concentration and mass change. The inverse relationship is that as sucrose concentration increases, the mass change will decrease. By the conclusion, it was also concluded that the color-coded solutions had molarities of: Yellow= 0.2M Blue= 0.4M Clear= 0.6 Pink= 0.8M Green= 1M The hypothesis was supported by this conclusion.

Math review

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Biology
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Chemistry
Solutions
Equilibrium chemistry
Physical chemistry
Analytical chemistry
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PH
Base
Properties of water
Osmotic pressure
Molar concentration

AP Biology Math Review 2013 Take out an APPROVED calculator and formula sheet. 2) Pick a grid sheet. You will solve each problem and grid in the answer. 3) Timing ? 1 min 20 seconds average Tips Grid LEFT to right Use the formula sheet Don?t round until the end Look at HOW the answer should be given ?round to nearest?? .123 The 1 is in the tenths place The 2 is in the hundredths place The 3 is in the thousandths place Q1: Chi Square A hetero red eyed female was crossed with a red eyed male. The results are shown below. Red eyes are sex-linked dominant to white, determine the chi square value. Round to the nearest hundredth. 66 White Eyes 134 Red Eyes # flies observed Phenotype 3 min Chi Square Strategy Given?observed

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