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Biology and Chemistry Homework Help Forum

Free Biology, Chemistry, Geology homework help via qualified mentors. Please use the template when requesting help and show your work. Gain understanding today!

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How to Compute Activity Coefficients in Urine Samples?

Dec 13, 2008 · Replies 7 · Mar 19, 2009

Replies: 7

Views: 3K

Chemistry- electronegativity and bonding

Mar 19, 2009 · Replies 1 · Mar 19, 2009

Replies: 1

Views: 3K

Chemistry - Entropy Changes in Physical Processes

Mar 19, 2009 · Replies 1 · Mar 19, 2009

Replies: 1

Views: 10K

Iron(III) Chloride and Potassium Thiocyanate reaction

Mar 19, 2009 · Replies 1 · Mar 19, 2009

Replies: 1

Views: 38K

Sodium Phosphate and Ammonium Molybdate reaction

Mar 19, 2009 · Replies 1 · Mar 19, 2009

Replies: 1

Views: 12K

How Do HCl, Aniline, Sodium Nitrite, and Beta-Naphthol React?

Mar 18, 2009 · Replies 2 · Mar 18, 2009

Replies: 2

Views: 2K

Competitive inhibitors (biochemistry)

Mar 17, 2009 · Replies 4 · Mar 18, 2009

Replies: 4

Views: 9K

Easy percentage prob (for pro) hahah

Mar 18, 2009 · Replies 1 · Mar 18, 2009

Replies: 1

Views: 2K

Lineweaver-Burke and some peculiar results

Mar 17, 2009 · Replies 4 · Mar 17, 2009

Replies: 4

Views: 2K

Finding the number of atoms in 0.500 mol of Argon

Mar 17, 2009 · Replies 4 · Mar 17, 2009

Replies: 4

Views: 12K

Is transcription a subprocess of translation in protein synthesis?

Mar 16, 2009 · Replies 2 · Mar 17, 2009

Replies: 2

Views: 3K

Mass of cluster question in astronomy

Mar 10, 2009 · Replies 1 · Mar 17, 2009

Replies: 1

Views: 2K

Polymer: Draw Structural Formula 1,3-Butadiene Z

Mar 16, 2009 · Replies 1 · Mar 17, 2009

Replies: 1

Views: 3K

Solving Equilibrium Problems: NH4HS & CCl4

Mar 15, 2009 · Replies 10 · Mar 17, 2009

Replies: 10

Views: 3K

Calorimetry & Enthelpy: Effects on Temperature in an Insulated Chamber

Mar 16, 2009 · Replies 2 · Mar 16, 2009

Replies: 2

Views: 2K

CO Paramagnetic/Diamagnetic & Bond Strength

Mar 16, 2009 · Replies 1 · Mar 16, 2009

Replies: 1

Views: 2K

Which C4H10O Alcohols Do Not React with K2Cr2O7?

Mar 16, 2009 · Replies 3 · Mar 16, 2009

Replies: 3

Views: 2K

Organic Chemistry Synthesis Question

Mar 15, 2009 · Replies 1 · Mar 16, 2009

Replies: 1

Views: 3K

Theoretical max. pressure of a given quantity of water freezing to ice

Mar 15, 2009 · Replies 1 · Mar 16, 2009

Replies: 1

Views: 3K

Pressure above which graphite will spontaneously change into diamond

Mar 15, 2009 · Replies 1 · Mar 16, 2009

Replies: 1

Views: 6K

PH of solution from mixing four solutions

Mar 15, 2009 · Replies 2 · Mar 15, 2009

Replies: 2

Views: 6K

What is the Standard Enthalpy Change for the Reaction 4NH3 + 3O2 --> 2N2 + 6H2O?

Mar 12, 2009 · Replies 7 · Mar 15, 2009

Replies: 7

Views: 4K

Gen Chem - Isomers in a complex ion

Mar 14, 2009 · Replies 2 · Mar 15, 2009

Replies: 2

Views: 3K

Thermal Decomposition of Carbonates

Mar 14, 2009 · Replies 3 · Mar 15, 2009

Replies: 3

Views: 5K

Chemistry - Net ionic equations, ionic solids

Sep 12, 2006 · Replies 2 · Mar 14, 2009

Replies: 2

Views: 30K

Who can do the summary for me i need it now

Mar 14, 2009 · Replies 1 · Mar 14, 2009

Replies: 1

Views: 3K

Calculate SO42- Concentration in Mixture of Na2SO4 & Al2(SO4)3

Mar 13, 2009 · Replies 5 · Mar 13, 2009

Replies: 5

Views: 3K

HELP A problem on quantitative aspects of electrolysis

Mar 13, 2009 · Replies 4 · Mar 13, 2009

Replies: 4

Views: 4K

How Do KCl and NaCl Differently Affect Stomatal Opening in Plants?

Mar 11, 2009 · Replies 5 · Mar 13, 2009

Replies: 5

Views: 9K

Partial pressures and equilibrium question

Mar 12, 2009 · Replies 3 · Mar 13, 2009

Replies: 3

Views: 3K

What mass must be added to raise concentration? Am I doing this right?

Mar 12, 2009 · Replies 1 · Mar 13, 2009

Replies: 1

Views: 2K

Why Is HCl a Stronger Acid Than H2S?

Mar 12, 2009 · Replies 1 · Mar 12, 2009

Replies: 1

Views: 3K

Solve Back Titration Problem to Find Ammonium Sulfate Mass in Fertiliser

Mar 12, 2009 · Replies 2 · Mar 12, 2009

Replies: 2

Views: 3K

What is the Total Heat Capacity of the Calorimeter?

Mar 11, 2009 · Replies 3 · Mar 12, 2009

Replies: 3

Views: 25K

Explaination needed for Stoichiometric problem and is Al salt colorless?

Mar 11, 2009 · Replies 1 · Mar 11, 2009

Replies: 1

Views: 6K

Atomic Orbitals: A Comprehensive Guide to Understanding

Mar 3, 2009 · Replies 5 · Mar 11, 2009

Replies: 5

Views: 5K

Maxwell's theory of Tm fact or science fiction

Mar 10, 2009 · Replies 2 · Mar 11, 2009

Replies: 2

Views: 2K

Why did my Biuret's test on eggwhite result in a brown color?

Mar 7, 2009 · Replies 3 · Mar 10, 2009

Replies: 3

Views: 19K

Quantitative Analysis Course - Titration Problem

Mar 9, 2009 · Replies 3 · Mar 10, 2009

Replies: 3

Views: 4K

Graph Reciprocal of Time vs Concentration in Chemistry

Mar 8, 2009 · Replies 3 · Mar 9, 2009

Replies: 3

Views: 5K

How Can I Verify Results for My Grade 9 Science Experiment?

Mar 9, 2009 · Replies 4 · Mar 9, 2009

Replies: 4

Views: 8K

Solve for \Delta G at 1000K: NH_{4}Cl Reaction

Mar 7, 2009 · Replies 5 · Mar 7, 2009

Replies: 5

Views: 8K

Acid Gas Disposal: Need Help Solving Problem

Mar 7, 2009 · Replies 1 · Mar 7, 2009

Replies: 1

Views: 2K

Chemistry Question: Pressure Change at Different Temperatures

Mar 7, 2009 · Replies 3 · Mar 7, 2009

Replies: 3

Views: 2K

Quantitative Biuret's test for protien

May 5, 2007 · Replies 3 · Mar 7, 2009

Replies: 3

Views: 17K

What would be the good method and solvent to purify biphenyl?

Mar 1, 2009 · Replies 4 · Mar 6, 2009

Replies: 4

Views: 6K

How Does the Condensation of a Carboxylic Acid and an Amine Form an Amide?

Mar 4, 2009 · Replies 1 · Mar 6, 2009

Replies: 1

Views: 2K

Stoichiometry Help: C_1_2H_2_2O_1_1 + 12O_2 -> 11H_2O + 12CO_2

Feb 26, 2009 · Replies 5 · Mar 6, 2009

Replies: 5

Views: 3K

How much energy does it take to cool and heat up water

Mar 4, 2009 · Replies 2 · Mar 5, 2009

Replies: 2

Views: 31K

How to Calculate Kp for a Sealed Vessel at Equilibrium?

Mar 5, 2009 · Replies 1 · Mar 5, 2009

Replies: 1

Views: 6K

Struggling with Acids and Bases Concepts in Chemistry AP?

Mar 5, 2009 · Replies 2 · Mar 5, 2009

Replies: 2

Views: 3K

MC: Chemistry Ideal Gas vs Real Gas

Mar 5, 2009 · Replies 3 · Mar 5, 2009

Replies: 3

Views: 6K

What Is the Formula of a Mixed Copper Salt Formed with OH- and Br- Ions?

Mar 3, 2009 · Replies 4 · Mar 5, 2009

Replies: 4

Views: 3K

Calculating Volume of Air for Nitrogen Dioxide Dillution

Mar 4, 2009 · Replies 1 · Mar 5, 2009

Replies: 1

Views: 2K

Investigating K3Fe(C2O4)3.3H2O Synthesis

Mar 4, 2009 · Replies 2 · Mar 4, 2009

Replies: 2

Views: 4K

Particle in a Box: Homework Statement & Equations

Mar 3, 2009 · Replies 8 · Mar 4, 2009

Replies: 8

Views: 3K

Molar enthelpy of combustion of magnesium

Mar 3, 2009 · Replies 1 · Mar 4, 2009

Replies: 1

Views: 17K

Question regarding homeostasis in Daphnia

Mar 3, 2009 · Replies 4 · Mar 3, 2009

Replies: 4

Views: 5K

What Is the Percent Composition of Magnesium and Aluminum in the Alloy?

Mar 3, 2009 · Replies 1 · Mar 3, 2009

Replies: 1

Views: 9K

What is the optimal light intensity for studying epithelial cells in microscopy?

Mar 2, 2009 · Replies 1 · Mar 3, 2009

Replies: 1

Views: 2K

Burning Candle/Oxygen Lab: Questions & Results

Feb 28, 2009 · Replies 2 · Mar 3, 2009

Replies: 2

Views: 4K

How to Balance Chemical Equations Involving Hydrogen and Atoms?

Mar 2, 2009 · Replies 17 · Mar 2, 2009

Replies: 17

Views: 5K

Minimum Pressure applied by reverse osmosis?

Feb 28, 2009 · Replies 1 · Mar 2, 2009

Replies: 1

Views: 11K

Chemistry Determining the quantity in moles of the gas that remains unreacted ?

Mar 2, 2009 · Replies 1 · Mar 2, 2009

Replies: 1

Views: 4K

What is the differences between hydrolysis and hydration?

Mar 2, 2009 · Replies 1 · Mar 2, 2009

Replies: 1

Views: 11K

Question 3:How can I determine the solubility of a compound using Ksp values?

Feb 26, 2009 · Replies 13 · Mar 2, 2009

Replies: 13

Views: 9K

Chemical Equilibrium: Calculating K with Ideal Gas Law

Mar 1, 2009 · Replies 8 · Mar 2, 2009

Replies: 8

Views: 3K

Predicting and Writing Net Ionic Equations for Chemical Reactions

Mar 1, 2009 · Replies 4 · Mar 2, 2009

Replies: 4

Views: 9K

Chemistry What is the molarity of the HCl solution? Help Solving Dilution & Moles Problems

Feb 28, 2009 · Replies 3 · Mar 1, 2009

Replies: 3

Views: 3K

CHEM - Uranium isotope relative abundance at diff times

Feb 28, 2009 · Replies 1 · Mar 1, 2009

Replies: 1

Views: 4K

Chemistry Effusion Homework: Calculate Molar Mass of Unknown Gas

Feb 28, 2009 · Replies 1 · Mar 1, 2009

Replies: 1

Views: 3K

Chemistry: Finding a temperature change using a temperature/gram ratio

Feb 28, 2009 · Replies 3 · Mar 1, 2009

Replies: 3

Views: 10K

Take-home free response question on plants

Feb 27, 2009 · Replies 3 · Feb 28, 2009

Replies: 3

Views: 3K

Endothermically dissociating compounds ?

Feb 28, 2009 · Replies 1 · Feb 28, 2009

Replies: 1

Views: 2K

Left, Right or Double headed arrow?

Feb 28, 2009 · Replies 1 · Feb 28, 2009

Replies: 1

Views: 3K

Mechanism for Aspartame to methanol?

Feb 27, 2009 · Replies 1 · Feb 27, 2009

Replies: 1

Views: 3K

What is the correct expression for the rate law of a first order reaction?

Feb 27, 2009 · Replies 1 · Feb 27, 2009

Replies: 1

Views: 3K

Is the Blood Alcohol Level High Enough for a DWI?

Feb 25, 2009 · Replies 10 · Feb 27, 2009

Replies: 10

Views: 7K

Understanding Benzene: Hybrid Structures vs. Superposition Explained

Feb 26, 2009 · Replies 3 · Feb 27, 2009

Replies: 3

Views: 2K

Does Dipole Moment Increase with Bond Length for the Same Charge?

Feb 26, 2009 · Replies 4 · Feb 27, 2009

Replies: 4

Views: 12K

Mix 10% & 24% Acid Solution to Make 10 L of 14% Acid

Feb 26, 2009 · Replies 3 · Feb 27, 2009

Replies: 3

Views: 2K

Chemistry: Significant Figures and Addition

Feb 18, 2009 · Replies 8 · Feb 27, 2009

Replies: 8

Views: 4K

Question about a bunsen burner lab?

Feb 26, 2009 · Replies 3 · Feb 26, 2009

Replies: 3

Views: 13K

What is the Percentage by Mass of CH4 in the Mixture?

Feb 24, 2009 · Replies 3 · Feb 26, 2009

Replies: 3

Views: 3K

1-bromobutane conversion work shown

Feb 18, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 4K

Calculating Ksp: A Temperature-Dependent Approach

Feb 25, 2009 · Replies 2 · Feb 26, 2009

Replies: 2

Views: 8K

How Do You Calculate Moles of Gas and CO2 Concentration Using the Ideal Gas Law?

Feb 18, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 3K

Solve Octet/Duet Rule Equation: NOCl?? | Answer

Feb 17, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 8K

Where Does Phosphate for ATP Cycle Come From?

Feb 20, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 3K

How to Calculate Heat Lost or Gained in a Reaction?

Feb 23, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 9K

Is My Stoichiometry and Limiting Reagents Work Correct?

Feb 25, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 5K

Which Substance Acts as an Acid or Base in These Cases?

Feb 25, 2009 · Replies 2 · Feb 26, 2009

Replies: 2

Views: 2K

Chemical Equilibrium: Observing Changes in Cr2O7- & CrO4- Mixture

Feb 25, 2009 · Replies 1 · Feb 26, 2009

Replies: 1

Views: 4K

Is This the Correct Balanced Equation for Producing Bleach?

Feb 25, 2009 · Replies 1 · Feb 25, 2009

Replies: 1

Views: 2K

Calculating the [H+] and pH of a lactic acid solution

Feb 25, 2009 · Replies 2 · Feb 25, 2009

Replies: 2

Views: 8K

Why aren't cell potentials multiplied by coefficients?

Feb 21, 2009 · Replies 3 · Feb 24, 2009

Replies: 3

Views: 7K

Theoretical Yield, Molar Mass, and Percent Yield

Feb 22, 2009 · Replies 1 · Feb 24, 2009

Replies: 1

Views: 28K

Lack of Lewis Catalyst for Bromination (Halogenation)

Feb 24, 2009 · Replies 1 · Feb 24, 2009

Replies: 1

Views: 7K

Recovering KNO3 from Aqueous Solution at 10°C

Feb 24, 2009 · Replies 1 · Feb 24, 2009

Replies: 1

Views: 3K

Do larger seeds need less water to germinate?

Feb 23, 2009 · Replies 1 · Feb 24, 2009

Replies: 1

Views: 2K

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