315 Answered Questions for the topic General Chemistry

General Chemistry Chemistry

01/26/16

Questions are below please help I'm having a lot of trouble... Please show work and explanation and answer thank you!
Question #1An 811 mL sample of hydrogen was selected over water at 21.0 degrees celsius on a day when the barometric pressure was 759 torr. What volume would the dry hydrogen occupy under standard... more
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General Chemistry Chem Lab Chem 2 Help Chemistry Lab

01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...
Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more
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01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...
Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water.    I am so so so... more
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01/19/16

Chemistry lab question? Making a solution??? Please help!!
Starting with solid sodium chloride, how would you make one liter of 2.000 ppm (parts per million) sodium chloride solution?   tip: 1 ppm = 1 g solute/10^6 g solution , for dilute aq solutions 1... more
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General Chemistry

01/04/16

3. Determine the oxidation state of the metal in each of the following a. Al2(SO4)3.18H2O b.(Al(H2°)6)3+ c.(Ag(NH3)2)+
3. Determine the oxidation state of the metal in each of the following a. Al2(SO4)3.18H2O b.(Al(H2°)6)3+ c.(Ag(NH3)2)+  
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General Chemistry Chemistry Intermolecular Forces

12/07/15

CHEMISTRY PLEASE HELP? Intermolecular forces.. Explain th differenced in structure and bonding of three pairs of molecules??
Account for the differences in properties given in the table below in terms of the differences in structure and bonding in each of the following pairs.   Substance    Bond Length   F2          ... more
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11/30/15

Chemistry question??PLEASE HELP? Element X, whose atoms have an outer-she'll electron configuration ns2np1, is most likely to react chemically to form ...
Element X, whose atoms have an outer-she'll electron configuration ns2np1, is most likely to react chemically to form ions which have a charge of: -3.     +3.        -2.     +1.        -1.   can... more
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General Chemistry Chemistry Gas Laws Ideal Gas Law

11/29/15

Ideal gas law problem?? - CHEMISTRY
What is the temperature of methane gas (CH4) if 4.78 mol of gas are collected in 9.2 L at 789 torr?    PV=nRT   All help is greatly appreciated!!   Here is what I was thinking.. but I am not... more
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General Chemistry Chemistry Effusion

11/29/15

Gas Effusion Chemistry Problem? Determining molar mass and molecular formula? PLEASE help me?
A gas made up of only C and H effuses in 1.50 min. Under the exact same conditions, a sample of Br2 gas effuses in 4.73 min. Determine the molar mass of the unknown gas and suggest what the... more
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General Chemistry Chemistry Word Problem

11/21/15

with a substance initially at 20.00 degree C, 5.00 g of solid sodium nitrate was dissolved in 100.0 g of water
With a substance initially at 20.00 degree C, 5.00 g of solid sodium nitrate was dissolved in 100.0 g of water in a calorimeter, and the temperature of the resultant solution was 14.80 degree C.... more
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General Chemistry Chemistry

11/18/15

whats the molecular equation of magnesium metal and Al3+?
 what is the molecular equation of magnesium metal and Al3+  
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General Chemistry Chemistry Enthalpy Bond Energy

11/08/15

Can you PLEASE help me with CHEM? Using bond energies to determine the enthalpy of reaction for the following reaction???
I am kind of confused with this, so if you could show your work so I understand how you get the answer, I would appreciate it more than you know!!!Use the Table of Bond Energy Terms (BE), to... more
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General Chemistry

11/06/15

Calculate the freezing point and boiling point of each of the following solutions:
Calculate the freezing point and boiling point of each of the following solutions:       1)  the freezing point of the solution: 153 g of sucrose, C12H22O11 , a nonelectrolyte, dissolved in... more
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General Chemistry Chemistry Ions

11/02/15

Can you please help me??! Chemistry problem: Identifying a solution containing ions of an unknown element X based on the results of three tests? Multiple choice
A solution containing ions of an unknown element X is divided into 3 samples. The following tests were performed on samples of the solution. Sample Test Observation1 Add H+ (aq) No Change2 ADD... more
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General Chemistry Chemistry Ions

11/02/15

CHEM HELP PLEASE???!!! A solution containing ions of an unknown element X is divided into 3 samples. Identify X.?(multiple choice!)
A solution containing ions of an unknown element X is divided into 3 samples. The following tests were performed on samples of the solution.   Sample              Test                  ... more
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General Chemistry

10/17/15

Metallic copper is oxidized by dilute nitric acid to form Cu2+ and NO
Metallic copper is oxidized by dilute nitric acid to form Cu2+ and NO.   i)Write the two half equations associated with this reaction?   ii) Identify the oxidation and reduction half-... more
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General Chemistry Chemistry Enthalpy

10/15/15

Calculate enthalpy change for a reaction?? PLEASE help????????
The enthalpy change for the following reaction is -483.6 kJ: 2H2 (g) + O2 (g) → 2H2O (g) Therefore, the enthalpy change for the following reaction is __________ kJ: 4H2 (g) + 2O2 (g) → 4H2O... more
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General Chemistry Chemistry Stoichiometry Enthalpy

10/15/15

Enthalpty stoichiometry problem?? PLEASE help??!!
The value of H for the reaction below is -72 kJ. _______kJ of heat are released when 1.0 mol of HBr is formed in this reaction. H2 (g) + Br2(g) => 2HBr (g) I tried to solve it.. 1.0 mol HBr (-72... more
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10/14/15

Enthalpy of reaction problem? Please help?
Can you please help me?? I am so lost on how to solve this, and would love to see exactly how to do it. I know you have to break up the compounds into ions if they are aq, but not much else. In... more
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General Chemistry Chemistry Unit Conversion

10/13/15

Convert 0.0420 lbs/ft^3 to g/L? Chemistry conversion? Check my work??
Here are the conversion factors.. (1lb = 454 g, 1 ft = 12 in, 1 in = 2.54 cm, 1cm^3 = 1mL)     0.0420 lbs/ft^3 (454g/1lb)(1^3 ft^3/12^3 in^3)(1^3 in ^3/2.54^3 cm^3)(1^3 cm^3/ 1^3 ml^3)(1^3 ml^3... more
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General Chemistry Chemistry Oxidation Reduction

10/10/15

Balancing oxidation-reduction reaction by writing half-reactions? Can you check my answer please!?
Na + Al+3 => Al + Na +      ox: (Na => Na+ + e-) *3 red: Al+3 + 3e- => Al   Al+3 + Na =. Al + 3Na+   please let me know if this is right!  Thank you so very much!!
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10/10/15

Can you check my answer on a problem where I needed to predict the products of a single replacement reaction??
Predict the product of the single replacement reaction and balance the final equation. Use the activity series to determine if the reaction will occur first. Include state symbols for all... more
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General Chemistry Chemistry Stoichiometry

10/10/15

Can you help me with this volumetric stoichiometry problem?
How many grams of chlorine has would be produced is 250 mL of 2.00M HCl was mixed with an excess of bleach, according to the equation below?    NaClO (aq) + HCl (aq) => Cl2 (g) + NaOH... more
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09/27/15

PLEASE HELP!!!? Percent composition problem?
Silver is reacted with excess mercury (II) chloride, producing a solid silver chloride precipitate. If the actual yield of 25.5 g silver chloride represents a 77 percent yield, how much silver was... more
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09/27/15

I could really use some help with this chemistry percent yield problem??
Silver is reacted with excess mercury (II) chloride, producing a solid silver chloride precipitate. If the actual yield of 25.5 g silver chloride represents a 77% yield, how much silver was... more
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