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Chemistry
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Questions (99,835)
CuCO3=CuO +CO2.
Find the mass of 1mole of each substance taking part in the reaction. (Ar:Cu=64,C=12,O=16). When 31g of CuCO3 is
6 answers
asked by
Busola
5,296 views
a chemical engineer placed 1.520 g of a hydorcarbon in the bomb of a calorimeter. The bomb was immersed in 2.550 L of water and
5 answers
asked by
Tori
5,233 views
2. What is the reduction half-reaction for the following unbalanced redox equation?
Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 ->
5 answers
asked by
jack
5,905 views
1. Hydrogen bromide(HBr) is a strong, highly corrosive acid and what is the pOH of a 0.0375M HBr solution?
a)12.57 b)12.27 c)1.73
6 answers
asked by
anonymous
3,381 views
How many grams of HCl must be used to produce 10.0L of chlorine gas at STP?
Reaction: 2HCl (g)--->H2 (g)+Cl2 (g)
7 answers
asked by
Cliff
6,420 views
Which type of sulphide has a Zig-Zag chain structure?
4 answers
asked by
Abubakar Osemu Abdulrahman
212 views
Is potassium citrate ionic compound or molecular compound?
4 answers
asked by
Melissa
3,043 views
How many grams of SO2 can be produced from 100g of S and excess O2
5 answers
asked by
Mo
1,980 views
the question reads:
a) balance the equation: H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O b)what mass of each product results if 750 mL of
5 answers
asked by
Anonymous
4,477 views
How many moles of silver will be deposited from a silver (i) trioxonitrate (v) solution by 16.0g of copper (Ag=108,Cu=63.5)
4 answers
asked by
Gift
1,677 views
What is the enthalpy change when 4.608 g of ethanol, C2H5OH(ℓ), undergoes complete combustion?
C2H5OH(ℓ) + 3O2(g) --> 2CO2(g)
5 answers
asked by
anonymous
1,931 views
How many liters of gaseous carbon monoxide at 27 Celsius and 0.247 atm can be produced from the burning of 65.5 g of carbon
6 answers
asked by
Anonymous
1,605 views
How would you prepare 250 mL of a 10% (w/v) KCl solution? (KCl=74.6 g/mol)
4 answers
asked by
sea
2,998 views
Two flasks A and B of equal capacity of volume contain SO3 and Co gas respectively under similar conditions of temperature and
7 answers
asked by
Mimi
6,200 views
3 moles C6H12O6 in 100 ml equals what molarity?
7 answers
asked by
Katie
1,843 views
A 2.9 L sample of gas has a pressure of 5 atm and a temperature of 50 °C. What will be the new temperature in Kelvin if the
6 answers
asked by
nene
3,421 views
The Ksp for nickel(II) hydroxide is 5.47E-16. What is the base dissociation constant for nickel(II) hydroxide?
So I started off
5 answers
asked by
a Canadian
2,610 views
Gas is confined in a tank at a pressure of 10.0 atm and a temperature of 15o
C. If half of the gas is withdrawn and the
5 answers
asked by
Angie
2,068 views
A is a solution containing 5.00 g of HNO3 in 500 cm\(^3) of solution. B is a solution of NaOH of unknown concentration. 21.30cm3
5 answers
asked by
adeola babs
798 views
For the reaction CH3COOH- CH3COO + H+, which of the following statements is true?
CH3COO- is an Arrhenius base. CH3COO- is a
5 answers
asked by
Unknown
7,774 views
Mno4- + So3-2 = Mno2 + sO4-2 (OH-) solve this redox reaction and give me the method also
4 answers
asked by
kiara
16,614 views
A 25.00mL sample of a household cleaning solution was diluted to 250.0mL in a volumetric flask. A 50.00mL aliquot of this
5 answers
asked by
Ellen
2,587 views
Use the following reactions to arrange the elements A, B, C, and D in order of their redox activity, from greatest to least.
2 A
5 answers
asked by
Rebekah
2,455 views
Calculate the Gibbs free energy change for the reaction below when initial concentrations of CR3+ and Cu2+ are 1 M (F= 96500 J/V
4 answers
asked by
audrey
1,946 views
In the chemical reaction where 0.1 M of N2O4 (g) is converted to 2NO2 (g), what are the concentration values of NO2 (g) in the
7 answers
asked by
Anonymous
1,899 views
Am asking on how a solid sample of lead ii chloride can be prepared using the following reagents dilute nitric acid, dilute
4 answers
asked by
Monicah
1,349 views
What will happen if a mixture of BaCl2.2h2O and KCl heated up to 150 centigrade ?
4 answers
asked by
Ashen
3,950 views
Write the equation for the dissolution of (NH4)2S04 in water. How many moles of each type of ion, and how many total moles of
4 answers
asked by
Kelly
3,634 views
Chalcocite is an ore from which copper can be extracted for commercial use. The formula for this important ore is Cu2S. In the
6 answers
asked by
BreAnne
2,492 views
Suggest reasons why recrystalization from water would probably not be a suitable procedure for purifying the following
3 answers
asked by
Toney
1,227 views
A sample of a mixture containing only sodium chloride (NaCl) and potassium chloride (KCl) has a total mass of 4.000g. When this
3 answers
asked by
Steve
2,622 views
Vapour pressure of benzene and toluene are 0.9bar and 0.85bar. 7.8g of benzene is added to 180g of toluene. To find the vapour
4 answers
asked by
Isha
3,712 views
A contains 1.60g of trioxonitrate(v) acid in 250cm³ of the solution.
B contains 9.0gdm3 of XHCO3, 25cm³ portions of B required
4 answers
asked by
Marvellous
515 views
I answered as many as I could but can someone double check my answers and help me with the rest?
1. Example Bond Energies of
4 answers
asked by
Tommy Tucker
830 views
How many moles of each ion are present, per liter, in a solution that is labeled “0.221 M
CaCl2 ”? CaCl2 Ca +2 + 2 Cl-
4 answers
asked by
Jerry
1,101 views
HF hydrolyzes according to the following equation: HF(aq)+H2O(l)<-> H3O+(aq)+F-(aq)
When 0.0300 mol of HF dissolves in 1.0 L of
5 answers
asked by
alison
2,434 views
What is the equilibrium constant for the reaction: Si + O2 <-> SiO2 ?
Is the answer just [SiO2]/[Si][O2] ?
4 answers
asked by
Anonymous
1,817 views
suppose that you dissolve 250ml of drink crystals in 1000ml of water. You get 1175ml of drink rather than 1250ml. how can you
6 answers
asked by
Kesar
1,322 views
what is the pH of a 2.62x10^-1 M NaNO2 solution? NB the pKa for HCN=9.212
12.13 13.42 1.87 8.29 0.58 and also; what is the pH of
4 answers
asked by
Lucinda
1,190 views
calculate the Volume Occupied By 0.125mol of oxygen at 27 and Pressure Of 2.02*10[1mol of gas occupies 22.4dm
4 answers
asked by
Anonymous
482 views
how much copper sulphate will require saturating 80 grams of water at 20 degree celcious .if solubility of copper sulphate at
4 answers
asked by
diwas pathak
1,255 views
A relative density bottle of mass 25g has a capacity of 50cubic centimetre .The bottle is completely filled with methylated
4 answers
asked by
Eugenia
1,727 views
How many grams MgCl2 will be formed from 25.6 mL of a 0.100M HCl solution reacting with excess magnesium metal
4 answers
asked by
Cassidy
2,232 views
Determine the freezing points of each 0.20m aqueous solution.
a)K2SO4 b)CsNO3 c)Al(NO3)3
4 answers
asked by
Jack
2,062 views
what mass of ammonium chloride can be added to 100g of water at 20 degrees C before the solution becomes saturated
7 answers
asked by
kate
2,243 views
What is the most common chemical method for removing H_30^+ ions in aqueous solution? Write a net ionic equation which describes
3 answers
asked by
J.M
2,459 views
From the following data for the decomposition of N2O5 in CCl4 solution at 48 C, show that it is a first order reaction.
t (mins)
4 answers
asked by
Anonymous
1,675 views
Write the reaction for the formation of lithium phosphide from its elements.
a) how many moles of lithium phosphide form when 3.2
4 answers
asked by
Ello mate
1,303 views
An aqueous solution of Na2SO4 has a molal concentration of 0.293 mol kg-1. Its density is 1.0350 g mL-1.
Calculate the molar
10 answers
asked by
write2khin
2,260 views
what happens when a seed crystal is placed into a saturated solution?
3 answers
asked by
jill
830 views
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