07/31/17

A car travels at 30 km/h for 10 minutes and then at 40 km/h for 15 minutes. What is the total distance traveled?
A car travels at 30 km/h for 10 minutes and then at 40 km/h for 15 minutes. What is the total distance traveled?
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07/30/17

Does D-Mannitol have an empirical formula?
The Molecular formula of D-Mannitol is C6H14O6 is the empirical C3H7O3
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07/30/17

What is the total work done by gravity, if an object is thrown upward and it returns to its original position
 Explain
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07/29/17

Can someone help me identify the functional groups in ascorbic acid?
I just started organic chemistry and am having a hard time identifying functional groups.
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07/29/17

Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.49?
Anybody willing to help me to understand this question a bit more?   Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.49? The Ksp of Fe(OH)2 is... more
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07/29/17

What volume of oxygen is needed to burn 279.52 mL of acetylene (C2H2)?
Answer the question  please thanuou very much 
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07/28/17

naming compounds
(111) A hypothetical element xylo(symbol Xy) forms four different compounds with another hypothetical elemnent phone(symbol Ph). Using the old nomenclature, write the empirical formula for each... more
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07/27/17

Consider the following reaction. A(aq) <--> 2B(aq) Kc = 6.04 x 10^-6 at 500K
Hello everybody I have been struggling with this and was wondering if somebody could help and explain it to me?Consider the following reaction. A(aq) <--> 2B(aq) Kc = 6.04 x 10^-6 at 500K If... more
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07/27/17

At a certain temperature, the Kp for the decomposition of H2S is 0.795. H2S(g) <--> H2(g) + S(g)
Hello everybody I have been struggling with this problem and was wondering if somebody could help and explain it to me?At a certain temperature, the Kp for the decomposition of H2S is 0.795. H2S(g)... more
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07/27/17

help with chemistry question
A 10.0 L reaction vessel captured oxygen gas, O2, and registered a pressure of 152 kPa at a temperature of 0 °C. Find the mass of the oxygen gas.
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07/27/17

how to answer
A water bottle label indicates a concentration of 2.5 ppm of nitrates. Find the mass, in grams, of the nitrates in the 500 mL bottle of water.
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07/27/17

question help please
If the [H+] was found in a lab sample to be 1.0 x 10-4 mol/L then calculate the pH and what pH of NaOH of equal volume and concentrate neutralize the acid?
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07/27/17

can someone help with this question
A sodium hydroxide solution of 0.1 mol/L concentration needs to be prepared from a 2.0 mol/L solution. What volume of the concentrated solution should you use to prepare 500 mL of the diluted... more
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07/27/17

i need help with this question
how to Calculate the molar concentration of sodium ions when 100 mL of 0.2 mol/L sodium sulphate, Na2SO4, solution is mixed with 400 mL of 0.50 mol/L of sodium nitrate, NaNO3.
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07/27/17

please help with question for chemistry
Aluminum reacts with iron (II) oxide to produce aluminum oxide and iron. Find the percentage yield of iron if 85.0 g of iron (II) oxide reacts with 35.0 g of aluminum metal and 65 g of iron are... more
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07/27/17

i need help with this question
When 27.98 g of hydrated tin (II) chloride was heated up, 18.97 g of the anhydrous salt was left. how do you Determine the formula of the hydrated salt.
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07/27/17

explaining trends
how would you Explain the opposing trends of ionization energies and atomic radii in the alkali group of the periodic table.
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07/27/17

this is troubling me can you help
what is the Comparoson and contrast the formation of bonds, lattice structure, electron distribution and physical properties between ionic and molecular compounds by using sodium chloride and water... more
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07/26/17

The following two elements react to form an ionic compound: 1) Na (Z = 11) 2) Se (Z = 34) If the compound that is formed by the reaction of these two elements c
Answer please i want the answer  
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07/26/17

How do you determine the molecular formula/chemical formula of a single element?
For example, Hydrogen is H2 and Oxygen is O2. How did we get the 2 subscripts for each? Thank you so much
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07/26/17

what is the pH of a .01 M solution of potassium formate, HCOOK?
the pKa of formic acid, HCOOH, is 3.75.
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07/26/17

What volume of oxygen is needed to produce 911.8 g of aluminum oxide from aluminum?
Answer 
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07/26/17

A.Mass of evaporating dish 21.345g B. Mass of evaporating dish and saturated NaCl solution 42.817g C. Mass of dish and NaCl after evaporation 38.915g
Report the mass % of NaCl in this solution.  Write the numbers as a percentage with the correct number of significant figures as shown. (i.e. 25%) there should be no space between the numbers and... more
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07/25/17

What volume of oxygen is needed to produce 210.4 g of aluminum oxide from aluminum?
Please solve the question
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07/25/17

How many liters of hydrogen will be produced when 5099 g of aluminum are combined with hydrobromic acid to make aluminum bromide?
Please solve solve exact answer
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