81 Answered Questions for the topic Chemistry, Homework

Chemistry, Homework

05/01/18

combustion of coke is a combination reaction CO2 is not a pollutant. then why is combustion of coke harmful
chemistry qustions
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04/29/18

Chemistry: Stoichometry
Lithium metal decomposes in water and releases hydrogen gas. If 275 mL of hydrogen gas are produced at STP, what is the mass of lithium that reacted.   Li + H2O -> LiOH + H2
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04/29/18

Chemistry: Stoiciometry
A Student used 4.55 grams of salicylic acid, along with acetic anhydride, to prepare aspirin.C7H6O3 + C4H6O3 -> C9H8O4 + C2H4O2(salicylic)   (acetic an)  (aspirin)    (acetic acid)(a)Find the... more
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Chemistry, Homework

04/26/18

A sample of a gas at 0.5 atm pressure and 25 OC occupies a volume of 2.0 L. What pressure is necessary to cause the gas to occupy 0.5 L at same temperature?
please help me Homework in science for Grade 10 students
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Chemistry, Homework

04/25/18

Hess's Law Problem. PLEASE HELP
4. For the reaction (at 298 K): 2 AgI (s) + Br2 (g) → 2 AgBr (s) + I2 (s) ΔHrxn = -108.0 KJIf the following are also true: ΔHof for AgBr (s) = -100.4 KJ/moland, ΔHof for Br2 (g) = +30.9 KJ/molthen,... more
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Chemistry, Homework Science Chemistry Helpneeded

04/25/18

What affects the atom economy
I need help with this question
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Chemistry, Homework Chemistry Chemistry Helpneeded

04/17/18

Sherry had 13.5 liters of oxygen gas measured at 25 degrees Celsius. She took that the gas outdoors where it was 10 degrees Celsius. Volume of the gas afterward
You must find the volume of the gas after she moved it outdoors. Remember volume at room temperature measures in STP... 273Kelvin...
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Chemistry, Homework Chemistry

04/16/18

Calculate the number of moles of zinc chloride in 100mL of 0.300 M solution
I need help please  
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04/15/18

What causes vitamin C concentration to increase in freshly squeezed orange juice?
Hi. In year 13 Chemistry we titrated an iodine solution with freshly squeezed orange juice which had been stored at different temperatures. We keep the orange juice solution in an incubator to... more
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Chemistry, Homework

04/12/18

chem gas laws
What is the final volume of 195 mL of oxygen gas at 14.0 deg C if the gas is heated to 211 deg C? Assume the pressure and the amount of gas are held constant. How do I work this out?
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Chemistry, Homework

03/29/18

what volume of 0.558M HNO3 SOLUTION IS REQUIRED TO REACT completely with 45.55 mL OF 0.0515m bA(oh)2?
this question comes from a take home exam that is due tomorrow. i don't know what i should do to solve this problem, i don't understand
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Chemistry, Homework

03/26/18

The mass of a single potassium atom is 6.50*10 to the negative 23 power grams. How many potassium atoms would there be in 313 milligrams of potassium?
I really need to solve this so I can learn how the steps go for it.
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Chemistry, Homework Chemisrty

03/19/18

what is the difference between saturated and unsaturated hydrocarbon
please help me i am unable to get the solution
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02/25/18

Calculate the theoretical yield of salicylic acid when you start with 2.7 grams of methyl salicylate and an excess of sodium hydroxide. Assume complete conversi
Chemistry Help please!
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Chemistry, Homework Molarity

02/16/18

If you dilute 13.1 mL of a 3.5 M solution to make 193.2 mL of solution, what is the molarity of the dilute solution?
im not exactly sure how to find the molarity, an answer would be nice, and also how to do it. 
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Chemistry, Homework

02/15/18

If we start with 150g of calcium carbonate and 50g of iron (III) phosphate...how much of which reactant is left over after the reaction is complete
i need to solve the word problem with that in info and : 3CaCO3 + 2FePO4 = 1Ca3(PO4)2 + 1Fe2(CO3)3
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Chemistry, Homework Chemistry Chemistry Lab

02/12/18

If a 5.0 mL test tube has a concentration of 0.051 M iron, what is the mass of iron (in mg) in the test tube
please help!!!
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02/12/18

During the experiment, you recover 2.8 mg of Fe by testing 100 mg of powder.
Assume a full pill weighs 300 mg and contains 27.0 mg of Fe. What is the % recovery for your experiment? In other words, what percentage of the total Fe in the pill did you recover?
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Chemistry, Homework

02/05/18

A 577 mL NaCl solution is diluted to a volume of 1.12 L and a concentration of 6.00 M . What was the initial concentration?
need help solving equations
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Chemistry, Homework Chemistry

01/29/18

Calculate the grams of nitrogen contained in a 5.00 gram sample of ammonium sulfate
Please answer my chemistry word problem. Basically, just do conversions for me. 
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Chemistry, Homework

01/14/18

Two isomers (A and B) of a given compound dimerize as follows?
Both processes are known to be second-order in reactant, and k1 is known to be .270 L/mol(s) at 25 C. In a particular experiment, A and B were placed into separate containers at 25 C,where [A]o =... more
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Chemistry, Homework Algebra 2 Help

01/10/18

Evaluate the function ƒ(x ) = x 2 + 1 for ƒ(2)
can you help me answer this 
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Chemistry, Homework

01/03/18

Perform the following operation and express the answer in scientific notation.
8.20x10^-2 x 2.50x10^6
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12/11/17

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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Chemistry, Homework Chemistry Chem Chemical Reactions

12/10/17

At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc.  
At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g) + 2B(g) <------> 4C(g) Kc= 2.13x 10^17 If, at this temperature, 2.40 mol of... more
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