02/04/18

Equilibrium
What would happen if O2 were removed from the following system at equilibrium at 25 degrees C?   2NO2(g) <--> 2NO(G) + O2(G)      Kc=7.4*10^-1 a. NO2 and NO concentrations would... more
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02/04/18

If your front lawn is 24.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1350 new snow flakes every minute, how much snow (in kilograms
 If your front lawn is 24.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1350 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour?... more
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02/04/18

Plz solv my que with solution ans foemula
Two element A and B form compound of formula AB2 and AB4 when dissolved in 20.0g of benzene 1.0g of AB2 lowers f.pt.by 23 degree centigrate whereas 1.0g of AB4 lowers.f.pt. by 1.3 degree... more
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02/03/18

AP Chemistry Rate Question
The reaction:   2NO(g) +Cl2(g)====> 2NOCl (g)   was studied at -10°C. The following results were obtained were: Rate= -(change in Cl2 concentration)/(change in time)   [NO]0 (mol/l)   ... more
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02/03/18

How do you conver 3.74 grams of H2 into grams of NH3
I do not know how to convert grams into grams.  I know how to convet it into moles, but not grams
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02/03/18

Solving a percentage mixture
The Royal Fruit Company produces two types of fruit drinks. The first type is 80% pure fruit juice, and the second type is 100% pure fruit juice. The company is attempting to produce a fruit drink... more
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02/02/18

If 100 grams of dextrose is ordered using a 50% dextrose solution, how many mL are needed?
Can someone show me how to do this.  My professor is making us do these problems and not showing us how to figure them out.  
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02/02/18

An IV requires the addition of 40 mEq of potassium chloride. You have a vial of KCI at a concentration of 20 mEq per 10 mL. How many mL should be added?
Could someone help me with this problem.  My professor is not explaining this properly.  He wants it set up in an algebraic expression and not showing me how to do it?  I will understand once... more
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02/02/18

Determine the limiting reactant if 17.5 g Zn and 27.5 g MnO2 are used. Determine the mass of Zn(OH)2 produced.
 I really need help finding the mass. So I included the previous masses.
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02/02/18

If I dissolve a Rolaid tablet(550 mg CaCO3 and 110 mg of Mg(OH)2) in 25 ml of 0.1 N HCl, what will be the resultant pH?
I am trying to calculate the efficiency of antacids, i would also like to know how much can one tablet neutralize?
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02/02/18

How do elements change as you move down a column in the periodic table
A. The atomic radius increases B. The number d protons decreases C. The atomic mass decreases D. The electro negativity decreases
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02/02/18

If I add 1000 mg of CaCO3 to 25 ml of 0.1 N HCl, what will resultant pH be?
If I am correct, the calcium carbonate should neutralize the acid leading to a pH of about 9.
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02/02/18

Does the sternum make blood
Does the sternum make blood
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02/02/18

A subatomic particle that has no charge and very small mass is called?
A. positron B. neutron C. meson D. neutrino
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02/02/18

Neutral atoms of a specific element can have different numbers of which of the following?
A. protons B. neutrons C. electrons D. none of the above.
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02/02/18

The atomic mass of an element is equal to the number of what?
a. protons b. protons plus neutrons c. protons plus electrons d. neutrons
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02/01/18

Confused Chem student, plz help
How many grams of carbon monoxide are produced when 2.00 moles of butyne are combusted? The combustion of liquid butyne (tetracarbon hexahydride) with limited oxygen gas produces carbon monoxide... more
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02/01/18

Chemistry conversion
What is the correct order of increasing temperatures in the set below? • 80 F  18 C  280 K
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02/01/18

How does a solution’s composition affect its electrical conductivity?
i need help with a cer about this 
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02/01/18

vitamin C (absorbic acid) contains 40.92% C, 4.58%H , and 54.50 O ?? what is the empirical formula for vitamin C
 vitamin C (absorbic acid) contains 40.92% C, 4.58%H , and 54.50 O ?? what is the empirical formula for vitamin C
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02/01/18

For the reaction: 2HI(g) → H2(g) + I2(g) d[H2]/dt = 7.5×10-2 M/s at a particular temperature and set of concentrations. What are d[HI]/dt and d[I2]/dt?
For the reaction:2HI(g) → H2(g) + I2(g)d[H2]/dt = 7.5×10-2 M/s at a particular temperature and set of concentrations.What are d[HI]/dt and d[I2]/dt?  what is the rate of the reaction? show work please more
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02/01/18

A prescription calls for 0.36 mg of a drug that you have in 50 mcg/mL concentration. How many mL do you need?
Can someone answer this in an algebraic expression?
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02/01/18

Can someone figure this out in an algebraic expression?
If 100 grams of dextrose is ordered using a 50% dextrose solution, how many mL are needed?
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02/01/18

Equilibrium and solubility product
In which of the following will PbBr2(s) be least soluble?   pure water 0.01M NaBr 0.01M KBr 0.02M NaBr PbBr2 will be equally soluble in all of the above solutions
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02/01/18

A neuron transmits information by the secretion of hormones.
Please help
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