90 Answered Questions for the topic Chemical reactions

11/24/19

A coffee cup has a heat capacity of 62.6J∘C. If the coffee cup's temperature increases by 1.20∘C, how much heat has it absorbed?
Round your answer to the nearest tenth.
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11/24/19

An unknown metal absorbs 23.8J of heat, and its temperature increases by 15.4∘C. What is the heat capacity of the metal?
Round your answer to two decimal places.
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11/19/19

45.0 g of ice at –10.0 C is mixed with 325 g of water at 37.0 C. Calculate the final temperature of the mixture.
45.0 g of ice at –10.0 C is mixed with 325 g of water at 37.0 C. Calculate the final temperature of the mixture. Assume that no energy in the form of heat is transferred to the environment. (Heat... more
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11/05/19

mixture of MnSO4 and MnSO4*4H20 has a mass of 2.005 g. After heating to drive off all the water the mass is 1.780 g. How many grams of MnSO4*4H20 are present in the mixture?
A mixture of MnSO4 and MnSO4*4H20 has a mass of 2.005 g. After heating to drive off all the water the mass is 1.780 g. How many grams of MnSO4*4H20 are present in the mixture? What is the mass... more
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05/21/19

What is the number of molecules

What is number of molecules of2CH4?
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03/07/19

Find Chlorine gas formed and which reactant remains in excess. (Use dimensional analysis)

Chlorine can be generated by heating together calcium hypochlorite and hydrochloric acid.Calcium chloride and water are also formed.A. If 50.0 g Ca(OCl)2 and 275mL of 6.00 M HCl are allowed to... more
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03/03/19

What mass of H2(g) is produced?
An excess of aluminum foil is allowed to react with 225 mL of an aqueous solution of HCl (d=1.088 g/mL) that contains 18.0 % HCl by mass. What mass of H2(g) is produced?
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10/05/18

chemistry question
A flask contains a mixture of nitrous oxide (N2O) and oxygen (O2) with partial pressures of 425 torr and 786 torr respectively.What is the ratio of the number of moles of N2O to the number of moles... more
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09/25/18

If 0.525 g of Fe2O3.xH2O are heated and 0.389 g of Fe2O3 are obtained
If 0.525 g of Fe2O3.xH2O are heated and 0.389 g of Fe2O3 are obtained, what is the value of x?Your answer should have three significant figures. In this case x does not have to be a whole number.
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09/25/18

Chemical Reaction with density?
I was given the equation: NaN3 --> Na2 + N2, which I balanced to:2NaN3 --> 2Na2 + 3N2 (I hope that is correct) a) Determine the number of grams of N2 are produced by the decomposition of... more
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09/25/18

AP Chemistry Reaction HW Problem
I was given the equation: Ca(OH)2 + H3PO4 --> H2O + Ca3(PO)4, which I balanced to:3 Ca(OH)2 + 2 H3PO4 --> 6 H2O + Ca3(PO)4I am supposed to finda) How many grams of calcium phosphate are... more
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09/03/18

Why are silver, lead, and mercury so special? (why do they always precipitate out and never dissolve)
please be detailed but simple. i have to write a random paper about this yet we were never taught this. it's due tomorrow and before you say i procrastinated, this was just assigned friday and the... more
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08/13/18

why heat is formed when methanol mixed with water?
when methanol mixed with water heat is formed.what is behind it 
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07/26/18

Chemistry chemical reaction rate questions
For the reaction 4NH3 + 7O2 --> 4NO2 + 6H2O.   a.) Provide a valid expression for the reaction rate   b.) How is the rate at which O2 disappears related to the rate at which NO2 appears in... more
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04/03/18

What is the heat capacity of a 30.0 gram sample of matter that cools off to 25c from 100c when 100.0 grams of 20c water are added to it?
Don't know how to start it please help.
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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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02/23/18

If 34.19g of NaCl react with excess of AgNo3, how many molecules will be formed?
Chemistry Question
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02/11/18

Order of Reaction and rate constant
The total pressure in atmospheres was recorded during the decomposition of acetaldehyde (CH3CHO(g)) at 701K for certain time intervals shown in the chart. Use the information to answer the... more
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02/01/18

chemical that would react with ribitol phosphate.
i am a microbiologist, and i have a question from chemistry. i would like to know what are the possible kind of chemicals that would react with ribitol phosphate and result in a colour change or... more
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01/11/18

H2SO4 to SO3 in the desert
If we have a H2SO4 barrel in the desert, how is it possible to find SO3 on the sand near it. knowing that there is no way for the H2SO4 to reach its boiling point which is 340°C. is there any... more
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12/12/17

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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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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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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12/10/17

Calculate the [Zn2 ] in the solution if the cell potential, Ecell, is -1.061 V.
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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12/10/17

Calculate the potential for each cell as shown below
Calculate the potential for each cell as shown below and indicate whether the metal electrode in the half-reaction opposite the standard hydrogen electrode, S.H.E., would be the anode or the... more
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