03/27/18

Explain the electrolysis of molten magnesium chloride. (6 marks)
I have a mock exam tomorrow and would really appreciate if someone could help with this question I am struggling with (to get full marks)
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03/27/18

when an acid and base are mixed together they will always form a _______ and a ________
pH study guide
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03/27/18

What is the overall energy change if 1,500 g of N2 are reacted to make ammonia?
Overall energy changes
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03/26/18

Chemistry magnesium reaction with HCI
0.0367g of magnesium to produce hydrogen gas collected over water at 24°C and 746mmHg atmospheric pressure. volume of the collected gas was 46.3mL, what is the value of the gas constant, R?Percent... more
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Hw1

03/26/18

homework problem
A "normal" blood pressure has a gauge pressure of 120 millimeters of mercury [mm Hg] (systolic reading) over 80 millimeters of mercury [mm Hg] (diastolic reading). Convert 120 millimeters of... more
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03/26/18

what are the properties of a buffer?
The properties of a buffer and how it works.
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03/26/18

NEED HELP PLZZ
)A compound of Bromine & Rubidium contains 65.94g of metal and 62.06g of nonmetal. Howmany grams of rubidium are in 36.77g of compound? How many grams of Bromine?
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03/25/18

How to calculate enzyme activity based on absorbance?
For calculation about enzyme activity based on absorbance.
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03/25/18

How do I solve a chemistry problem like this?
C. The density of the concentrated nitric acid used in this experiment was determined to be 1.42 grams per milliliter. Determine the percentage by weight of HNO3 in the original sample of... more
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03/25/18

How do I solve this AP Chemistry problem?
B. A 10.00mL sample of the concentrated nitric acid was diluted with water to a total volume of 500.00mL. Then 25.00mL of the diluted acid was tritrated with the standardized NaOH solution prepared... more
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03/25/18

Can you please help me with this problem?
The percentage by weight of nitric acid HNO3 in a sample of concentrated nitric acid is to be determined. A. Initially a NaOH solution was standardized by titration with a sample of potassium... more
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03/25/18

chemistry college
A piston has an external pressure of 8.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.160 liters to 0.510 liters?Express your answer with the appropriate... more
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Vb

03/25/18

homework problem
What is ΔH∘rxn for the following chemical reaction?CO2(g)+2KOH(s)→H2O(g)+K2CO3(s) Express the standard enthalpy of reaction to three significant figures and include the appropriate... more
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03/25/18

How do I solve this AP Chemistry problem on H2SO4?
Concentrated sulfuric acid (18.4M H2SO4) has a density of 1.84 grams per millimeter. After dilution with water to 5.20M, the solution has a density of 1.30 grams per milliliter and can be used as... more
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03/25/18

How do I solve this AP Chemistry problem on HNO3?
The percentage by weight of nitric acid HNO3 in a sample of concentrated nitric acid is to be determined.   A. Initially a NaOH solution was standardized by titration with a sample of potassium... more
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03/25/18

Chemistry help!!!!
Solid potassium chlorate (KClO3) decomposes into potassium chloride and oxygen gas when heated. How many moles of oxygen form when 60.1 g completely decomposes?
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Hw1

03/25/18

homework problem
A 1.00 L flask is filled with 1.20 g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pressure is 1.150 atm .Part AWhat is the partial pressure of argon, PAr,... more
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03/25/18

a) Why must the body’s temperature be regulated
human biology
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03/24/18

How many moles of hydrogen are needed to completely react with two moles of nitrogen
Mole conversion 
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03/24/18

problem solution
A sample of neon effuses from a container in 74 seconds. The same amount of an unknown noble gas requires 151 seconds.Identify the gas
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03/24/18

What is the value of the base hydrolysis constant for NaNO2 Ka= 4.5×10^-4
A. 4.5×10^-4 B. 2.2×10^-11 C. 4.5×10^-18 D. 4.5×10^10 E. 2.1×10^-9
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03/24/18

What is the pH of 0.35M KOBr solution? For HOBr Ka=2.5×10^-9
A. 8.60 B. 9.06 C. 11.07 D 11.53 E. 13.54
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03/24/18

What is the value of the base hydrolysis constant for NaNO2, sodium nitrite? Ka=4.5×10^-4 for HNO2
A. 4.5×10^-4 B. 2.2×10^-11 C. 4.5×10^-18 D. 4.5×10^10 E. 2.1×10^-9
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03/24/18

Can you plot a bar chart? Or is it drawn?
On a Biology exam paper the question asked to plot the data on a the graph. After the test I asked the teacher if I was required to draw a bar chart or plot a graph. She answered and said based on... more
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03/24/18

Urgent Chemistry Question
If the previously shown reaction  begins with 76 g of 02 and 43 g of C2H6 identify the limiting reactant, the excess reactant, in the maximum number of grams of CO2 that can be formed. How many... more
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