10/09/20

Calculate the concentration of all remaining ions in solution after precipitation ends.
10.0 mL of 0.200 M Na2SO4 and 20.0mL of Pb(NO3)2I know I need to find the net ionic equation but once I get there how do I solve for each ion's molarity?
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10/08/20

Kinetics Experiment
Is crystal violet stable when hydroxide is not added?Why is knowing the rate of law for a reaction important? (Especially when talking about a reaction between crystal violet and hydroxide)
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10/08/20

Heat of fusion and heat of vaporization

How much heat energy is needed to take a 50 gram piece of ice at -10 degrees Celsius and turn it into steam at 120 degrees Celsius? Specific Heat for Ice: 2.04 J/ g times K Specific Heat for Steam:... more
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10/08/20

Express your answer with the appropriate units.
Iron(III) oxide reacts with carbon monoxide to produce iron and carbon dioxide.Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)What is the percent yield of iron if the reaction of 63.5 g of iron(III) oxide produces... more
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10/08/20

Molecular and Net Ionic Equation
What is the type of reaction when sulfuric acid is added to the black CuO(s)?Write a molecular equation and a net ionic equation for the reaction to support your answer.What are the spectator ions?
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10/08/20

Determine the mass (in grams)
Given the balanced chemical equation,2 H(g) → H2(g)        ΔH0rxn = −436 kJ/molDetermine the mass (in grams) of H2(g) produced when 823 kJ of heat is released.
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10/08/20

Calculate the change in internal energy of the system in kJ.
If a system absorbs 40 kJ of energy and does 11 kJ of work on the surroundings, calculate the change in internal energy of the system in kJ. For your answer, only type in the numerical value with... more
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10/08/20

Is Methylsulfonylmethane Stable in Mineral Water?
I suffer from electrolyte imbalances quite often, so I have started making my own carbonated mineral water with potassium chloride, sodium bicarbonate, and magnesium bicarbonate. Am I introducing... more
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10/08/20

Calculate the mass of the polystyrene sample.
A sample of polystyrene, which has a specific heat capacity of 1.880 J*g^-1 * C^-1, is put into a calorimeter that contains 300.0 g of water. The polystyrene sample starts off at 88.6 C and the... more
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10/08/20

Each of the following is a reaction that occurs in the cells of the body. Identify which is exothermic and endothermic.
Succinyl−CoA+H2O→succinate+CoA+8.9kcalGlucose+Pi+3.3kcal(14kJ)→glucose−6−phosphate
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10/08/20

Express your answer as a chemical equation. Identify all of the phases in your answer.
Dinitrogen oxide, also known as laughing gas, is a sweet-tasting gas used in dentistry. When solid mixture of sodium nitrate and ammonium sulfate is heated, the products are solid sodium sulfate,... more
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10/08/20

find concentration of a diluted solution that is formed by placing 5.3 mL of this “stock” (or concentrated) HCl solution in another volumetric flask and adding water to make a total of 25.0 mL?  
A “stock” solution was made by placing 50 mL of 3.0 M HCl in a volumetric flask and adding water to double the volume. 
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10/07/20

In chemistry, how would somebody determine the state of matter of a compound in a chemical equation?
Grade 11 Uni Chem student here with a test tomorrow.I understand that you can use the chart to determine if polyatomic compounds are soluble or insoluble with certain elements determining whether... more
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10/07/20

Analyze Redox Reactions
Br2 + Mn2Br- + Mn2+Species oxidized:Species reduced:Oxidizing agent:Reducing agent: As the reaction proceeds, electrons are transferred from___to___.
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10/07/20

Analyze Redox Reactions
2ClO3- + 5Fe+ 12H+5Fe2+ + Cl2+ 6H2OName of the element oxidized:Name of the element reduced:Formula of the oxidizing agent:Formula of the reducing agent:
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10/07/20

Net Ionic Equations
Write a net ionic equation for the reaction that occurs when excess hydroiodic acid and potassium sulfide are combined.
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10/07/20

Calculate the initial temperature of the iron sample.

A 57.2 sample of iron, which has a specific heat capacity of 0.449 J * g^-1 *C^-1 , is put into a calorimeter that contains 150.0 g of water. The temperature of the water starts off at 20.0 C. When... more
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10/07/20

What mass of sodium chloride is present in the so
If a solution has a total mass of 54.6g and is 2.46 % by weight in sodium chloride, what mass of sodium chloride is present in the solution?
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10/07/20

Calculate the mass
Calculate the mass of manganese sulfate monohydrate , MnSO4·H2O, required to make 25 mL of a 0.020 M solution.
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10/07/20

Calculate the mass of malonic acid
Calculate the mass of malonic acid, CH2(COOH)2, required to make 25 mL of a solution that is 0.15 M in malonic acid.
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10/07/20

Calculate the new temperature of the water bath.

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 9.90kgof water at 38.0°C. During the reaction 140.kJ of heat flows out of the flask and into the... more
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10/07/20

General question for writing chemical equations
Basically need a rundown when writing a chemical equation based on word descriptions (eg write the chemical equation of hydrochloric acid reacting with calcium chloride).How do I know what element... more
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10/07/20

Titration problem
If 27.21 ml of NaOH are required to titrate 50 ml of a solution that contains 1.2067g of KHP what is the molarity of the NaOH? You'll need to look up the molecular weight of KHP. Do not include... more
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10/06/20

CHEMISTRY HOMEWORK
A researcher studying the nutritional value of a new candy places a  sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is  If the... more
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10/06/20

CHEMISTRY HOMEWORK
In a constant‑pressure calorimeter, 60.0 mL of 0.340 M Ba(OH)2 was added to 60.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 22.66 ∘C to 27.29 ∘C.... more
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