97 Answered Questions for the topic Chemical reactions
What type of reaction is this?
Al(s) + 3Ag(NO3)2(aq) ===> Al(NO3)2(aq) + 3Ag(s)Double displacement?
How do collisions between molecules transfer energy from a system of reacting substances to its surroundings?
A.) They cause heat to flow from the system to the surroundings.B.) They cause the thermal energy of the surroundings to decrease.C.) They cause the potential energy of the system to increase.D.)... more
5 Stoichiometry questions Please help
1(a) sodium and water react to give sodium hydroxide and hydrogen gas, H2 and 1.15 grams of sodium were added to excess oxygen and produced 1.6grams of sodium hydroxide. What was the percentage... more
If you burn 33.7g of hydrogen and produce 301g of water, how much oxygen reacted?
In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor.Hydrogen + Oxygen —> WaterIf you burn 33.7g of hydrogen and produce 301g of water, how much... more
Rate of reaction question
I. Increasing the temperature increases the rate of a chemical reaction BECAUSE II. the activation energy is lowered. A) I is TRUE, II is FALSE B) I is FALSE, II is TRUE C) I and II are BOTH FALSE... more
Predict the products, balance, and write the FULL and NET ionic equations when given the reaction equation: Na₂CO₃ (aq) + Al(NO₃)₃ (aq) ->
Balance the equation and write the FULL and NET ionic equations when given the reaction equation: HCl (aq) + Sr(OH)₂ (aq) -> SrCl₂ (aq) + H₂O (l)
Write the net ionic equation for 2Li₃PO₄ (aq) + 3Pb(NO₃)₂ (aq) -> 6LiNO₃ (aq) + Pb₃(PO₄)₂ (s)
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.
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.
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
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
What is the number of molecules
What is number of molecules of2CH4?
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
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?
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
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.
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
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
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
why heat is formed when methanol mixed with water?
when methanol mixed with water heat is formed.what is behind it
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
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.
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!
If 34.19g of NaCl react with excess of AgNo3, how many molecules will be formed?