| Here's the questions in Chemistry. Go get 'em! 1-20 of 171 | Next |
| Bounty | Status | Sub-Category | Question | Due |
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| $0.50 | Answered | General Chemistry |
why does a gummi bear react to potassium
why does a gummi bear react to potassium chlorate?
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Dec. 06, 2008 |
| $1.00 | Answered | General Chemistry |
For the reaction. What is the approxim
For the reaction. What is the approximate value of the work at 300 K? CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O(l) 1. +2.5 kJ 2. +7.5 kJ 3. -7.5 kJ 4. -5 kJ 5. -2.5 kJ 6. +5 kJ 7. No work is done ******...
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Dec. 05, 2008 |
| $1.00 | Answered | General Chemistry |
please help!!!!!!!!!!!!!!! the mass of 3
please help!!!!!!!!!!!!!!! the mass of 322 mL of hydrogen gas at 4.0 atm and -73 degrees C is 1.21 grams. what is the density of hydrogen gas at STP?
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Dec. 04, 2008 |
| $1.00 | Answered | General Chemistry |
Heat solution problem
Potassium perchlorate (kCIO4) has a latice of -599kj/mol and a heat of hydration of -548kj/ mol. Find the heat solution for potassium perchlorate and determine the temperature chane that occurs when...
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Dec. 03, 2008 |
| $1.00 | Answered | General Chemistry |
Cr + NiSO4. what is the single replaceme
Cr + NiSO4. what is the single replacement? And what is a balanced reaction using only metals?
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Dec. 03, 2008 |
| $1.00 | Answered | General Chemistry |
a student wanted to make sodium sulphate
a student wanted to make sodium sulphate by reacting sodium metal with dilute sulphuric acid. why should this method not be used?
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Dec. 03, 2008 |
| $1.00 | Unanswered | Biochemistry |
which ha smallest pkb n,n- diethylbutana
which ha smallest pkb n,n- diethylbutanamine or butanamide
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Dec. 03, 2008 |
| $1.00 | Answered | General Chemistry |
Help please
Phosphorus occurs naturally in the form of fluorapatite, CaF2.3Ca3(PO4)2, the dot indicates 1 part CaF2 to 3 parts Ca3(PO4)2. This mineral is reacted with an aqueous solution of sulfuric acid in the...
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Dec. 03, 2008 |
| $1.00 | Answered | General Chemistry |
Chem 101 I need help!!!
How many moles of O2 are required for the complete reaction of 48.0 g of C2H4 to form CO2 and H2O?
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Dec. 03, 2008 |
| $1.00 | Answered | General Chemistry |
i need major help
i need major help what anions are in potassium and then i need to know some physical and chemical properties of potassium and lastly 10 compunds containing potassium including chemical name and...
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Dec. 02, 2008 |
| $1.00 | Answered | General Chemistry |
what is the pH of a 0.0035 M KOH solutio
what is the pH of a 0.0035 M KOH solution A. 2.46 B. 5.65 C. 8.35 D.11.54
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Dec. 02, 2008 |
| $0.50 | Answered | Organic Synthesis |
need help on balancing an equation. C2H2
need help on balancing an equation. C2H2 + O2 yeild CO2 + H2O?
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Dec. 02, 2008 |
| $20.00 | Unanswered | Organic Chemistry |
Synthesis and the properties of each compound in the process
Synthesize the following compound using organic compounds with 1 or 2 carbon atoms only only, and any inorganic compounds. Products of each reaction must be major products. -Describe mechanisms of...
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Dec. 01, 2008 |
| $1.00 | Answered | General Chemistry |
when w+x=z+y how many grams of w must re
when w+x=z+y how many grams of w must react completely with 225 grams of x to result in 375 grams of product
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Dec. 01, 2008 |
| $1.00 | Answered | General Chemistry |
Ice to Steam
specific heat of ice: 2.09 J/gC deltaHfus=6.02 kj/mol specific heat of water: 4.18 J/gC deltaHvap= -40.7 kj/mol specific heat of steam: 1.84 J/gC How much energy(heat) is required to convert 52.0 g...
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Dec. 01, 2008 |
| $0.25 | Answered | Organic Chemistry |
help me inderstand the structural formul
help me inderstand the structural formula for 3-methyl-2pentene,
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Dec. 01, 2008 |
| $0.25 | Answered | Organic Chemistry |
PLEASE HELP IM SO LOST!!!!!
i need help finding the structural formula methyl propyl ketone
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Dec. 01, 2008 |
| $5.00 | Unanswered | Physical Chemistry |
3 Thermodynamics Problems - Need immediate help! Price negotiable...
I am having serious issues solving the attached 3 thermodynamics problems. My textbook is pretty useless and haven't had much luck looking online. I am looking for someone to help me get started...
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Dec. 01, 2008 |
| $1.00 | Answered | General Chemistry |
Define the following terms in the simpliest way and easiest way
Define the following terms??? 1. A.M.U.????? 2. Density??? 3. Ion??? 4. Molecule?? 5. Element?? 6. Compound?? 7. Gram Atomic Weight?? 8. Empirical formula?? I need just the basic definiton for each...
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Dec. 01, 2008 |
| $3.00 | Answered | General Chemistry |
How to write empirical formulas for compounds??
1.Ferrous Oxide 2.Ammonium Phosphate 3.Sodium Carbonate 4.Zinc Hydroxide 5.Calcium Nitrate 6.Ammonium Nitrate 7.Aluminum Sulfate 8.Hydrogen Chloride 9.Potassium Nitrate 10.Zinc Permanganate I need...
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Dec. 01, 2008 |
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