Search & Filtering
One of the main reactions involved in the production of iron from iron(III) oxide as found in iron ore, proceeds according to the following balanced chemical equation:Fe2O3 (s) + 3 C(s) → 2 Fe(s) + 3 CO(g)
We will consider the reaction of iron(III) oxide and carbon on a gram scale, although the same stoichiometry applies on the tonne scale.
If 22.7 g of carbon is available, what is the maximum mass of iron which can be produced when the iron(III) oxide is present in excess?
Enter your answer to three significant figures. Do not include units.
Suppose you decompose 0.250 mole of Ag2S into its element. How many moles of silver would you have? How many moles of sulfur would you have?
Since iron is more reactive than copper, it displaces the copper ions from the aqueous solution of copper sulphate. This is called a single displacement reaction of one metal by another metal. To experimentally test this, Joel reacted 0.9845 g of iron fillings with an excess of copper sulphate solution. When the reaction was complete the solution had changed from blue to green and a copper deposit weighing 1.024 g had formed in the solution. In this reaction, metallic iron is converted into ferrous ion (Fe2+) and cupric ion (Cu2+) is converted into metallic copper.
a) Calculate the number of moles of iron used and the number of moles of copper formed.
b) Calculate the theoretical mass of copper that was expected to be produced and hence determine the percentage yield of Joel’s experiment.
How many molecules of iron are present in 0.9845 g of iron fillings?
Question:
The organic compound below is abbreviated Tris and is basic. The conjugate acid (TrisITT has a pKa of 8.10.
TrisH+ + H20 = Tris + H30 +
Tris is commonly used as a component in buffer solutions to study biochemical reactions.
a) A buffer solution is prepared by mixing 12.5 mL of 0.100 mol L- 1 HCl with 25.0 mL of0.100 mol L- 1 Tris. What is the pH of this buffer? Write all the equations used and explain your steps.
b) The buffer was used to study an enzyme-catalyzed reaction in which 0.00020 mol of H30+ was produced. What is the pH of the solution after the acid reacted with the buffer? Write all the equations used and explain your steps.
Write the balanced NET IONIC equation for the reaction that occurs when hydrochloric acid and potassium hypochlorite are combined.
Use H3O+ instead of H+.
This reaction is classified as:
A. Strong Acid + Strong Base
B. Weak Acid + Strong Base
C. Strong Acid + Weak Base
D. Weak Acid + Weak Base
The extent of this reaction is:
.
A. ... Below 50%
B. ... 50%
C. ... Above 50%
D. ... 100%
water breaks down to produce hydrogen gas and oxygen gas
When you add a small amount of solute into the solvent in your set up 2 , what happen?
Answer the following questions.
1. (a) The formula of six compounds are given below.
C3H8, CH3CH2OH, CH3-O-CH2-CH3, HCOOH, CH3COOH
(i) Name the type of intermolecular forces present in the compounds.
(ii) Arrange these compounds in the order of increasing boiling point. explain your answer.
(i) Explain the polarity of the following simple covalent molecules: H2O, CO2, and SO2.
(ii) Which is the most polar molecule amo them? Explain.
To precipitate all the sulfate ions from 22.0 mL of 0.150 molarity aluminum sulfate as barium sulfate, how many mL of 0.250 molarity3. barium nitrate are required? (8 points)
____Ba(NO3)2(aq)+____Al2(SO4)3(aq)→______BaSO4(s)+____Al(NO3)3(aq)
To neutralize 15.8 mL of 0.687 molarity sodium hydroxide, how much 0.376 molarity HCl is needed? (5 points)
____HCl(aq)+____NaOH(aq)→____NaCl(aq)+____H(OH)(l)
Glucose is a natural sugar that occurs in abundance. What is the mass percent of a solution formed from 148 g of glucose and 698 g of water? (5 points)
What is the mass percent sucrose in a solution made by combining 365 g of a 8.90 percent sucrose by mass aqueous solution with 145 g of an 6.80 percent sucrose by mass aqueous solution? (5 points)
When 200 mL of 0.700 molarity silver nitrate is introduced to 150 mL of 0.500 molarity potassium chromate, how many grams of silver chromate will precipitate? (12 points)
____ AgNO3(aq) + ____K2CrO4(aq) → ____Ag2CrO4(s)+ ____KNO3(aq)
