05/07/20

What is the oxidation number of the copper in copper (II) sulfate?

2Al + 3CuSO4 = 3Cu + Al2(SO4)3
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05/07/20

Caliometry calculation
A piece of metal weighing 48.045 g was heated to 100.0 °C and then put it into 200.0 mL of water (initially at 25.0 °C). The metal and water were allowed to come to an equilibrium temperature,... more
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05/07/20

How many grams of water can be heated from 15.0 oC to 55oC using 4250.0 J.

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05/07/20

What volume of water would be required to make a 0.25 M solution with 2 moles of Ba(OH)2?
A. 0.625 LB. 0.10 LC. 1.0 LD. 10 L
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05/07/20

If 30 grams of KBr is dissolved in 100 g of water at 50 degrees celsius, how many more grams need to be added to make a saturated solution?

A. 50B. 60C. 80D. 120
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05/07/20

Identify the products for the following reaction and whether they would be (aq) or (s): CaBr (aq) + AgNO3 (aq) —>

A. CaAg (aq) + BrNO3 (s)B. Ca(NO3)2 (s) + BrNO3 (s)C. Ca(NO3)2 (aq) + AgBr (s)D. CaAg (s) + BrNO3 (aq)
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05/07/20

Based on the solubility rules, which of the following compounds would be soluble and precipitate out in a double displacement reaction?
A. Ca(NO3)2B. AgNO3C. Ba(OH)2D. MgCO3
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05/07/20

If you decrease the temperature of a solution what will happen to the rate of dissolution?
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05/07/20

Limiting reactants in moles
What is the greatest amount of ammonia (NH3) in moles that can be made with 4.7 mol N2 and 6.9 mol H2? Which reactant is limiting ? How many moles of excess reactant will be left after the reaction ?  more
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05/07/20

Acid base and pH
What is the [OH^−] of a 0.00033 M solution of Ca(OH)2? What is the [H3O^ +] of the solution?
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05/07/20

Acid base and pH
A solution has [H+] = 1.5 × 10 ^−7 M. What is the [OH−] in this solution?
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05/06/20

Acid base and pH
Determine the hydronium ion concentration in a solution that is 0.0028 M HNO3.
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05/06/20

Why is ice less dense than liquid water?

A.Ice has a greater mass than it does volumeB.Ice has a greater volume than it does massC. Ice is a solid and therefore less denseD. Ice is lighter than liquid wate
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05/06/20

Which of the following describes the Tyndall Effect?

A.The separation of suspensions into layers that include debris on the top, clear liquid, then heavy sand on the bottom of the containerB. A solution that has only one phase because the particles... more
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05/06/20

What volume of water would be required to make a 0.25 M solution with 2 moles of Ba(OH)2?

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05/06/20

Water solutions of which of the follwing will NOT conduct a current of electricity? A. CuSO4 B. C12H22O11 C. NaCl D. HCl
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05/06/20

What volume of a 0.20 M NaOH solution would a student need to make 500 mL of a 0.10 M NaOH solution?

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05/06/20

Chemistry (Solubility)
To what temperature must a mixture of 500g of water at 20°C and30g of KClO3 be raised in order for the solute to dissolve completely?
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05/06/20

Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild: mol H2
Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild=:________________ mol H2
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05/06/20

Acid base and pH
What is the pH of a solution with a hydronium ion concentration of 5 ×10^−2 M?
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05/06/20

Consider the following oxidative half reaction:

Mn(s) --> Mn2+ + 2e-A) Couple the oxidation reaction with a reduction half reaction that makes the overall redox reaction non-spontaneous (electrolytic cell). Write the balanced redox reaction... more
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05/06/20

Consider the following unbalanced redox reaction:
ClO3-(aq) + I-(aq) --> I2 (s) + Cl-(aq)A) Balance the redox reaction using water (H+ and OH-) as needed. Show work for each step.B) Identify the oxidizing reagent and the reducing reagent for... more
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05/06/20

Consider the following two redox reactions without any companion counterions:
Cr(s) --> Cr3+ + 3e- oxidation half Ag(s) --> Ag+ + e- reduction half A) Write a balanced overall redox reaction where Cr is oxidized and Ag is reduced. Show work with cancelling of... more
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05/06/20

BioOrganic Chemistry Problem

Look at the structural formula for D-tagatose.To what class of biomolecules does D-tagatose belong? What functional groups can you identify in D-tagatose? Would D-tagatose be soluble in water?... more
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05/05/20

What is the pH of a buffer?
The Ka of H2CO3 is 4.3 x 10-7. What is the pH of a buffer with 0.050 M H2CO3 and 0.50 M NaHCO3?
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