10/20/20

Calculate Enthalpy Change For A Chemical Reaction
When CO(g) reacts with O2(g) according to the following reaction, 283 kJ of energy are evolved for each mole of CO(g) that reacts. Use this information to calculate the enthalpy change for the... more
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10/20/20

Enthalpy Change and Chemical Equations
The following reaction is exothermic. H2(g) + F2(g)2 HF(g)    ΔH(1) = -542 kJ Calculate the enthalpy change for the reaction of the elements to form one mole of HF(g). 1/2 H2(g) + 1/2... more
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10/20/20

how can you separate sand from water and calculate the percent composition (using chemistry terms)
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10/20/20

A gas mixture containing oxygen, nitrogen, and neon exerts a total pressure of 1.36 atm .
If helium added to the mixture increases the pressure to 1.58 atm , what is the partial pressure (atm) of the helium?
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10/20/20

What is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at constant pressure and temperature?
A sample containing 4.20 g of O2 gas has an initial volume of 14.5 L . A sample of 0.800 mole of O2 is added to the 4.20 g of O2 in the container.Express the volume in liters to three significant... more
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10/20/20

Express your answer with the appropriate units.
A sample of a gas is in a sealed container. The pressure of the gas is 605 torr , and the temperature is 15 ∘C . If the temperature changes to 67 ∘C with no change in volume or amount of gas, what... more
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10/20/20

Express the mass to two significant figures and include the appropriate units.
Laparoscopic surgery involves inflating the abdomen with carbon dioxide gas to separate the internal organs and the abdominal wall.If the CO2 injected into the abdomen produces a pressure of 22... more
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10/19/20

Joule Conversion Heat+Work First Law
An automobile engine provides 511 Joules of work to push the pistons.In this process the internal energy changes by -2731 Joules.What is q for the engine? This represents the amount of heat that... more
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10/19/20

Joule conversion Heat+Work First Law
An automobile engine generates 2220 Joules of heat that must be carried away by the cooling system. The internal energy changes by -2856 Joules in this process.What is w for the engine? This... more
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10/19/20

Chemical Reactions Heat +Work First Law
A chemical reaction is run in which 380 Joules of heat are absorbed and 389 Joules of work are done on the system.Calculate the change in the internal energy of the chemical system.E =  Joules
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10/19/20

Energy Unit Conversions
Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table.The Joule (J) is the SI unit of energy.1 calorie... more
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10/19/20

Thermodynamic Question in Description

Question: A coffee cup calorimeter contains water at an initial temperature of 20 °C and is calculated to have a calorimeter constant (heat capacity) of 75 J/°C. A 28 g piece of an unknown metal is... more
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10/19/20

If 33.6 g of NO and 26.9 g of O2 react together, what is the mass in grams of NO2 that can be formed via the reaction below?
2 NO (g) + O (g) → 2 NO (g) Second Question: What volume of NO2 could be isolated at 945 mbar and 28 °C?
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10/19/20

What is the pH of a 0.0740 M solution of hydrocyanic acid, HCN (Ka = 4.9 × 10⁻¹⁰)?
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10/19/20

What is the Ka of the weak acid?
An unknown weak acid with a concentration of 0.260 M has a pH of 5.600. What is the Ka of the weak acid?
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10/19/20

Write the formula of the conjugate acid of the Brønsted-Lowry base, C₆H₅NH₂
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10/19/20

Determine if the following salt is neutral, acidic or basic
Determine if the following salt is neutral, acidic or basic. If acidic or basic, write the appropriate equilibrium equation for the acid or base that exists when the salt is dissolved in aqueous... more
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10/19/20

Write the formula of the conjugate base of the Brønsted-Lowry acid, HC₂O₄⁻
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10/19/20

What is the pH?
What is the pH of a 0.680 M solution of Ca(NO₂)₂ (Ka of HNO₂ is 4.5 × 10⁻⁴)?
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10/19/20

What is the pH?
What is the pH of a 0.0780 M solution of methylamine (CH₃NH₂, Kb = 4.4 × 10⁻⁴)?
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10/19/20

Determine the value of Ka for phenol.
A solution of phenol (HC₆H₅O) is prepared by dissolving 0.385 g of phenol in 2.00 L of H₂O. The solution has a pH = 6.29. Determine the value of Ka for phenol.
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10/19/20

Redox Reactions Chem (URGENT DUE AT MIDNIGHT 10/18 PLEASE HELP)
Fe + Cd2+Fe2+ + CdIn the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.
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10/19/20

The solubility product of calcium fluoride ( CaF2 ) is 3.5×10−11. If 2.0 mL of a 0.10 M solution of NaF is added to 128 mL of a 2.0×10−5M solution of Ca(NO3)2 , will CaF2 precipitate?
The solubility product of calcium fluoride ( CaF2 ) is 3.5×10−11. If 2.0 mL of a 0.10 M solution of NaF is added to 128 mL of a 2.0×10−5M solution of Ca(NO3)2 , will CaF2 precipitate?Unsure how to... more
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10/18/20

Chemistry Ionic Equations
Write a net ionic equation for the reaction that occurs when excess aqueous nitric acid is combined with solid zinc carbonate.Use the pull-down boxes to specify states such as (aq) or (s). If a box... more
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10/18/20

Please i am confused with this question. answer for me
Which hydrocarbon has carbon Carbon double bond? A. C4H6 B. C4H10 C. C5H12 D. C4H8
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