04/16/20

Calculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation.
a. [OH-] = 8.3 x 10-9 Mb. [OH-] = 7.4 x 10-2 Mc. [OH-] = 4.3 x 10-10 M
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04/16/20

Write an equation for the reaction that takes place
A buffer can be prepared using lactic acid [CH3CH(OH)CO2H] and its conjugate base, lactate ion [CH3CH(OH)CO2-].a. when H3O+ is added to this buffer.b. when OH- is added to this buffer.
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04/16/20

I need help with enthalpy change!!
If 2.98 g of N2(g) is converted to NH3(g) according to the following equation, N2(g) + 3H2(g) ----> 2NH3(g) and the change in enthalpy for the reaction is -92.6 kJ/mol, starting from one mole... more
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04/16/20

Give the formula for the conjugate acid of each base.
a.  F− b. CN- c. NH3 d. NO2-  e. OH-f. Cl-g. CH3NH2h. PO32-
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04/16/20

a sample containing 16 grams of f2 gas occupies what volume at STP?
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04/16/20

at STP, a sample of n2 gas occupies 40 liters. how many moles are n the sample and how many grams?
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04/16/20

at what temp. will 3.6 moles of o2 occupy 55 liters with 2.5 atmospheres pressure?
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04/16/20

Chemical Reactions
Predict the products and states for the follow set of reactants. Be sure to balance the final equation. For eachreaction, you must provide a written explanation of how you know what type of... more
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04/16/20

what would be the temperature of a gas when it is expanded to 5.25L.The gas originally occupies 3.45 L of space at 282 K.
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04/16/20

Empirical Formula
How many L of N2 are needed to react with 8.11 L H2? 
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04/16/20

2 NH3 → N2 + 3 H2 ΔHrxn = 92.2 kJ/mol How much energy, in kJ, is required to decompose 83.5 grams of Ammonia (NH3)?
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04/16/20

What volume of 0.200 M aluminum nitrate solution is needed to precipitate 50.0 grams of aluminum hydroxide from an excess of 0.100 M potassium hydroxide solution?
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04/16/20

Chemistry question
What are the functional groups present?How many multiple bonds present?
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04/16/20

Once again I can’t figure this out, please help (tenth grade chemistry)
9B. A vessel with a volume of 10.0L contains 2.80 g of nitrogen gas (N2) , 0.403 g of hydrogen gas(H2), and 79.9 g of argon gas (Ar). At 250C, what is the pressure of the HYDROGEN GAS? *
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04/16/20

Chemistry help!!!
Determine the [OH^-], pH, and pOH of a solution with a [H^+] of 9.4 x 10^-7 M at 25 °C. Determine the [H^+] , pH, and pOH of a solution with an [OH^-] of 2.4 x 10^-13 M at 25 °C. Determine the... more
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04/16/20

Each value below represents a different aqueous solution at 25 °C. Classify each solution as acidic, basic, neutral.
pH = 1.77 [OH^-] = 4.9 x 10^-5 pOH = 5.14 [H^+] = 1.0 x 10^-7 [H^+0 = 1.9 x 10^-5 pOH = 7.00 pH = 9.06 [H^+] = 5.0 x 10^-10 pOH = 13.53 [OH^-] = 4.6 x 10^-12
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04/16/20

What happens when Zn metal is dipped in Ni (NO3)2 solution?
What happens when Zn metal is dipped in Ni (NO3)2 solution? Can you please explain.
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04/16/20

which one of the following is most appropriate to use as an electrolyte for this purpose 
If we are performing electrolysis using two iron electrodes, which one of the following is most appropriate to use as an electrolyte for this purpose  Aqueous copper sulphate solution Aqueous... more
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04/16/20

As a birthday balloon is filled with helium, the amount of helium increases from 0.5 moles of helium to 5.5 moles of helium. If the initial volume of the balloon is 2.5 mL, what is the final volume?

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04/16/20

how do i answer this question?
Write the cell notation for an electrochemical cell consisting of an anode where Zn(s) is oxidized to Zn2+(aq) and a cathode where Fe3+(aq) is reduced to Fe2+(aq) at a platinum electrode. Assume... more
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04/15/20

What atomic subshell is found in the transition elements

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04/15/20

A sample of potassium sulfide (K2S) is known to have 0.199 moles. If each mole of K2S weights 110.3 g, what is the mass of the sample?

The mole is a unit of measurement used to describe the amount of a chemical substance. The mass of a chemical substance can be calculated by multiplying the number of moles by the mass of one mole.... more
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04/15/20

Find the molar mass of the compound Mg(NO3)2, given the following information.
The molar mass of a compound is the sum of the molar masses of each atom in the compound. Find the molar mass of the compound Mg(NO3)2, given the following information. Round your answer... more
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04/15/20

The solubility equilibrium constant for the dissolution of copper (I) chloride into copper ions and chlorine ion is Ksp = [Cu+][Cl-].
The solubility equilibrium constant for the dissolution of copper (I) chloride into copper ions and chlorine ion is Ksp = [Cu+][Cl-].If the solubility constant is Ksp = 1.7 × 10-7, and the... more
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04/15/20

Which statement must be true for a reaction to occur?

reactant molecules must have low surface areareactants must be at a lower energy state than productsProducts must be at a lower energy state than reactantsmolecules must collide with energy greater... more
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