11/11/17

please help! density equation!
If you dissolve 300 g of salt in 10 litres of water, what is the density of that solution of salty water? In this particular example, assume that the total volume doesn’t change when salt is added... more
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11/11/17

an explosion ocurs at a distance of 6.00km from a person. how long after the explosion does the person hear it. assuming temperature is 14c
 an explosion occurs at a distance of 6.00km from a person. how long after the explosion does the person hear it. assuming temp is 14c
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11/11/17

Mole Concept class assignment
Mg+HCl→MgCl2+H2. (a) 2.46 moles of HCl will produce how many moles of H2.
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11/10/17

Naming According to IUPAC
Plz Name this according to IUPAC:CH3-O-CH(OC2H5)-CH2-CH2(OC6H5)Here ,I am having problem in numbering it .Will methoxy and ethoxy will be numbered first or phenoxy .What is the rule in this regard... more
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11/10/17

Atomic Structure and periocity concept question
Why are the changes in election affinity as one goes down a group in the periodic table not nearly as large as variations in ionization energy.    My book does not explain this concept very clearly. more
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11/10/17

I am having trouble understanding this AP Chemistry Concept
Diagonal relationships in the periodic table  exist as well as the vertical relationships. For example, Be and Al are similar in some of their properties as are B and Si. Rationalize why these... more
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11/10/17

Buffer Solution
Starting with a 1.00 L of a buffer thatis 1.00 M in acetic acid and 1.00 M in sodium acetate, calculate the pH after the addition of 0.100 mole of NaOH. (assume that the addition does not change... more
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11/10/17

The pKa values of H3PO4 are 2.12, 7.21 and 12.67. The pH of a phosphate buffer containing 0.2 M NaH2PO4 and 0.1 M Na2HPO4 is _______�
Please give answer
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11/10/17

Calculate the mass of AgBr?
To a 250.0 mL volumetric flask are added 1.00 mL volumes of three solutions: 0.0100 M AgNO3, 0.145M NaBr, and 0.100 M NaCN. The mixture is diluted with deionized water to the mark and shaken... more
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11/09/17

There are 160 mg of acetaminophen in 5 ml. You are ordering 2L of acetaminophen. How many grams (g) of acetaminophen will you have available to give to patient
we are suppose to use dimensional analysis 
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11/09/17

How to make Zinc Sulfate Crystals?
Hi, I'm currently doing an experiment. I'm trying to grow Zinc Sulfate Crystals at home. I'm using Zinc Sulfate Monohydrate (ZnSO4⋅H2O) --- it is what I ordered from Ebay. I don't know if my... more
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11/09/17

calculate the number of moles of solute
14.03 mL of 0.1755 M K2Cr2O7 (aq)
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11/09/17

calculate the molarity of the two solutions.
1) 0.550 mol of NaOH in 2.35 L solution 2) 10.9 g of NaCl in 887 mL of solution
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11/09/17

calculate the molarity of 0.350 mol of Na2S in 1.85 L of solution.
also, calculate the molarity of 28.3 g of MgS in 795 mL of solution.
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11/09/17

how many grams of sucres are needed to make 675 mL of a 37.0% (w/v) sucrose solution?
answer must be g/sucrose
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11/09/17

Can you help me with this atomic structure problem?
How many orbitals can have the designation 5p, 3dz^2, 4d, n=5, n=4?
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11/09/17

how many grams of CaCl2 are needed to make 597.9 g of a solution that is 31.0% (m/m) calcium chloride in water?
note that mass is not technically the same thing as weight, but % (m/m) has the same meaning as % (w/w). how many grams of water are needed to make this solution?
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11/09/17

How many electrons are in 1.01 oz of a pure gold?
This is a question I have on my Chem 1 homework and don't know how to solve it
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11/09/17

when a solid compound dissolves in water what happens
gfzschytdang zfcvdrgnjhgbfc
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11/09/17

what's is the molecular formula of 1.24gram of phosphorus molecules ?
class 9 chemistry
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11/09/17

How many gallons each of 15% alcohol and 10% alcohol should be mixed to obtain 5 gal of 12% alcohol?
No extra details.
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11/09/17

Why the units of rate constant change with the change of order of reaction?
Units of rate constant
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11/08/17

Chemistry / mass stiochemistry question
Antimony can be prepared from sulfide ore by the following two-step process. What mass of antimony will be produced if 1.00 kg of ore that contains 23.2% of Sb2S3 by mass is reacted with excess of... more
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11/08/17

One of the reaction involved in formation of rust on your car involves iron solid reaction with water and oxygen to form iron (111) hydroxide
a how many iron atoms reacted b how much iron (111) hydroxide could be formed 45 g sample of iron was used
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11/08/17

Stoichimetry
iron, water and oxygen reacts to make iron lll hydroxide   a) how many  iron atoms reacted b) how much iron lll hydroxide could be formed (grams)
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