03/24/19

CHEMISTRY PROBLEM
50.0 mL of 0.10 M sodium chloride (NaCl) solution is mixed with 25.0 mL of 0.25 M silver nitrate (AgNO3) solution. After filtering and drying the product. 0.20 g of silver chloride was... more
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03/24/19

question asking for reducing agent?

Given the following net ionic equation:2 Al(s) + 3 Zn2+(aq)     →      2 Al3+ (aq) + 3 Zn(s)The species that acts as the reducing agent is:Question 12... more
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03/24/19

what is the structural formula for SeH4?
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03/23/19

A buffer solution is prepared from equal volumes of 0.200 M acetic acid and 0.600 M sodium acetate. Use 1.80 × 10−5 as Ka for acetic acid
A buffer solution is prepared from equal volumes of 0.200 M acetic acid and 0.600 M sodium acetate. Use 1.80 × 10−5 as Ka for acetic acid
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03/23/19

thermite reaction
Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid fuel rocket motors. The reaction isFe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s)What... more
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03/22/19

how many particles are in 381.5g of H2SO4
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03/22/19

what is the volume in liters of 8.50 moles of Co2
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03/22/19

determine the number of grams of 6.52L of H2 gas at stp

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03/22/19

Explain how the intermolecular forces in a substance will determine what that substance can be used for ?

In relation to the structure of plastics and some alternatives to plastic
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03/22/19

a) Write the balanced chemical equation that represents the standard heat of formation of O3(g) at 298 K. Use the pull-down boxes to specify states.

a) Write the balanced chemical equation that represents the standard heat of formation of O3(g) at 298 K.Use the pull-down boxes to specify states. Write fractions with a slash, such as 1/2 for one... more
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03/22/19

The standard enthalpy change for the following reaction is 511 kJ at 298 K. SnCl4(l) Sn(s, white) + 2 Cl2(g) What is the standard heat of formation of SnCl4(l)? kJ/mol
The standard enthalpy change for the following reaction is 511 kJ at 298 K. SnCl4(l) Sn(s, white) + 2 Cl2(g) What is the standard heat of formation of SnCl4(l)?  ____ kJ/mol
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03/22/19

The standard enthalpy change for the following reaction is 186 kJ at 298 K. CaH2(s) Ca(s) + H2(g) What is the standard heat of formation of CaH2(s)? kJ/mol
The standard enthalpy change for the following reaction is 186 kJ at 298 K. CaH2(s) Ca(s) + H2(g) What is the standard heat of formation of CaH2(s)?  kJ/mol
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03/21/19

Law of Conservation of Mass Word Problem
If 19.2g O2 react with Fe, how much Fe in grams were used given the following equation: 4Fe + 3O2 = 2Fe2O3? Is this even a physical science question???
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03/21/19

Limiting Reactants
For this reaction, 35.1 g bromine reacts with 13.6 g chlorine gas.bromine (g) + chlorine (g)  bromine monochloride (g)What is the maximum mass of bromine monochloride that can be formed?  What is... more
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03/21/19

Jessica ran 1 kilometer. How many meters did Jessica run?

A)1B)10C) 100D)1000
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03/21/19

what is the molarity where 3.21g of CaCl2 is in a 0.5 L solution
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03/21/19

chemistry sapling homework
What is the number of formula units in a  7.12 mol sample of  FeCl3?
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03/21/19

Balance and label the oxidation state of each element in each reaction.
Oxidation: Zn --> Zn2+ + 2e-Reduction: As2O3 + 12e- + 6H+ --> 2As3- + 3H2OReactions:As2O3 + 6Zn + 6H+ --> 2As3- + 6Zn2+ 3H2OAs2O3 + 6Zn + 6H2SO --> 2AsH3 + 6ZnSO4 + 3H20
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03/20/19

What is the heat q required to melt 10 grams of ice?
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03/20/19

Chemistry molarity question??
Chem hw..help pleaseA solution is prepared by dissolving 55.5g of CaCl2 in 300g of water. The density of the resulting solution is 1.05g/mL. The concentration of CaCl2 in this solution is... more
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03/20/19

The active site on enzyme is where the substrate fits

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03/20/19

Chem hw..help please
A solution is prepared by dissolving of CaCl2 in 300g of water. The density of the resulting solution is 1.05g/mL. The concentration of CaCl2 in this solution is ____molar.Answer: 1.48why??
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03/20/19

Trigonemetry-Finding heat lost and absorbed
You place a bottle containing 1.5 Liters of mineral water at 30*C into a refrigerator to cool to 6*C.  How many kJ of heat are lost by the water? q=1500 g*C *24*C This is how far I've gotten and... more
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03/19/19

If that amount, from problem 7 , fills a room 500,000 L, then how many parts per million carbon dioxide are in the room? 1 mol of gas occupies 22.4L​
If that amount, from problem 7 (the amount is the propane balanced equation: C3H8 + 5O2 = 3CO2 + 4H2O).
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03/19/19

What are the uses of heavy water?
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