10/23/20

Acid-Base Definitions
Identify each of the following reactions as an Arrhenius, Bronstead-Lowry, or Lewis Acid-base reaction. Remember some reactions may fit into multiple categories or may not fit any. In each of the... more
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10/23/20

The density of liquid Mercury (Hg) used in lab barometers and thermometers is 13.6 g/mL. Determine the density of Hg in lab/gal
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10/23/20

What is the de Broglie wavelength, in centimeters, of a 12.4 g hummingbird flying at 40 mph
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10/23/20

How much sodium hydroxide should you expect to use to reach the endpoint?
You are trying to confirm that your bottle of hydrochloric acid is actually 1.5 M, as labeled. You decided to perform a titration with 1.0 M sodium hydroxide and 14.4 mL of your hydrochloric acid.... more
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10/23/20

What is the volume in mL needed?
What is the volume in mL needed to prepared a 0.67 M NaOH solution using 0.74 g of NaOH? The molar mass of NaOH is 40.0 g/mol. Only enter the numeric value, do not enter the unit mL. 
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10/22/20

Net 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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10/22/20

Calculate percent error
The accepted ΔH for a reaction is −42.3 kJ/mol. A student has performed a lab experiment to determine the enthalpy change of the same reaction. Calculate the percent error.  Student 1 ... more
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10/22/20

Which non-metal forms an ionic bond with Barium in which the metal to non-metal ratio is 1:1?
a. Clb. Oc. Pd. None of these
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10/22/20

Which sample contains the least number of atoms?
a. 5 g cobaltb. 5 g calciumc. 5 g magnesiumd. 5 g copper
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10/22/20

Calculate change in reaction
Given thatH2(g)+F2(g)⟶2HF(g)    ΔH∘rxn=−555⋅4kJmol2H2(g)+O2(g)⟶2H2O2(l)    ΔH∘rxn=−572⋅4kJmolCalculate the value of ΔH∘rxn for 2F2(g)+2H2O2(l)⟶4HF(g)+O2(g) 
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10/22/20

Calculate heat change
In a constant‑pressure calorimeter, 58.7 mL of 0.930 M H2SO4 was added to 58.7 mL of 0.500 M NaOH.The reaction caused the temperature of the solution to rise from 22.30 °C to 26.01 °C. If the... more
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10/22/20

Calculate heat change
A calorimeter was used to measure the heat change when an ionic compound dissolves in water. The final mass of the contents of the calorimeter was 51.13 g and the change in temperature was 3.01... more
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10/22/20

Calculate change in standard enthalpy
Consider the chemical equations for the given reactions. Use the standard enthalpies of formation to calculate the changes in the standard enthalpies of formation to calculate the changes in the... more
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10/22/20

Calculate the number of moles of NO(g) formed in the reaction mixture
Ammonia reacts with O₂ to form either NO(g) or NO₂(g) according to the following UNBALANCED equations: NH₃(g) + O₂(g) → NO(g) + H₂O(g) NH₃(g) + O₂(g) → NO₂(g) + H₂O(g) In one experiment 6.00 moles... more
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10/22/20

how many grams of glucose were administered to the patient?
A glucose solution is frequently used as an intravenous (IV) solution to supply hydration and/or nutrition. Calculate amounts of glucose provided and volumes used. A patient received 3.25 L of a... more
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10/22/20

How much of each item must be mixed to get 7 cups of a mixture that is 7.6 % sodium​ hypochlorite?
A bleach is 6.25​% sodium hypochlorite and swimming pool shock treatment is 9.5​% sodium hypochlorite. How much of each item must be mixed to get 7cups of a mixture that is 7.6 % sodium​ hypochlorite? more
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10/22/20

Calculate the number of moles of NO(g) formed in the reaction mixture.
Ammonia reacts with O₂ to form either NO(g) or NO₂(g) according to the following UNBALANCED equations: NH₃(g) + O₂(g) → NO(g) + H₂O(g) NH₃(g) + O₂(g) → NO₂(g) + H₂O(g) In one experiment 6.00 moles... more
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10/22/20

What was the final total pressure in the cylinder (in atm) after the reaction, while it was still at 125°C?
A 11.3 mL sample of liquid ethanol (C₂H₅OH, density = 0.789 g/mL) was injected into a 10.0 L cylinder containing O₂ at a pressure of 4.50 atm and a temperature of 25°C. The cylinder was heated to... more
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10/22/20

What is the edge length of the cube of platinum, in centimeters?
A cubic piece of platinum metal (specific heat capacity = 0.1256 J/°C･g) at 200.0°C is dropped into 1.00 L of deuterium oxide ('heavy water,' specific heat capacity = 4.211 J/°C･g) at 25.5°C. The... more
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10/22/20

Balancing moleculor equations
How do you write the balanced molecular chemical equation for the reaction in aqeous solution for iron(III) chloride and sodium sulfide? If no reaction were to occur, we'd write NR.
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10/22/20

calorimeter experiment
when learning about coffee-cup calorimetry, i have 3 questions regarding it that have been making me a bit confused.when using a coffee-cup calorimeter in an experiment, why is it important to... more
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10/21/20

coffee-cup calorimeter
When doing an experiment using a coffee-cup calorimeter, NaOH, and Acetic Acid: If some heat was lost to or gained from the surroundings what would happen to the measured ΔT? How does this affect... more
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10/21/20

How does the electric force between two particles change if one of the particle’s charge is reduced by a factor of 3?
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10/21/20

How much of each item must be mixed to get 7 cups of a mixture that is ​6.7% sodium​ hypochlorite?
A bleach is 4.25​% sodium hypochlorite and swimming pool shock treatment is 11.5​% sodium hypochlorite. How much of each item must be mixed to get 7 cups of a mixture that is 6.7%... more
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10/21/20

Write out two balanced reactions that summarize the formation of [Cu(NH3)4]2+ and [Ni(NH3)4]2+ in your experiment.
I had written this two equations, however, I would just like to know if they are correct[Cu(H2O)4]2+(aq) + 8 NH3(aq) à[Cu(NH3)4]2+ + 8 H2O (l)Ni + 4NH3 → Ni(NH3)4 What change occurred when H2O was... more
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