Stoichiometry and Reactions Quiz

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Questions and Answers

How many moles of H2O are produced when 5 mol of NH3 completely reacts with O2?

7.5 moles

4.5 moles

5 moles

6 moles (correct)

What is the molecular weight of 1 mole of ethane (C2H6)?

32.0 g/mol

24.0 g/mol

28.0 g/mol

30.0 g/mol (correct)

In the reaction 4NH3 + 5O2 --> 6H2O + 4NO, if 3 moles of NO are produced, how many moles of H2O were used?

4.0 moles (correct)

3.5 moles

6.0 moles

4.5 moles

Given 12 grams of O2, how many grams of NO can be produced?

7.95 g Signup and view all the answers

How would you calculate the moles of A if you know the mass of A and its molecular weight?

moles = mass ÷ molecular weight Signup and view all the answers

In a given stoichiometric reaction, if the limiting reactant is NH3, what impact does it have on the production of H2O?

Decreases production of H2O Signup and view all the answers

What is the percent composition of hydrogen in ethane (C2H6)?

40% Signup and view all the answers

If Avogadro's number is used, how many molecules are there in 2 moles of H2?

1.2044 × 10^24 Signup and view all the answers

What occurs during the dissociation of NaOH in water?

Na+ ions and OH- ions become separated. Signup and view all the answers

Which of the following scenarios constitutes an acid-base reaction?

Neutralizing hydrochloric acid with sodium hydroxide. Signup and view all the answers

What is the criteria for a precipitation reaction to occur?

The formation of a solid that is insoluble in water. Signup and view all the answers

What is the correct process to determine the grams of product produced from a given amount of reactant in a reaction?

Convert moles of reactant to moles of product using coefficients. Signup and view all the answers

Which of the following ionic compounds is insoluble in water?

BaSO4 Signup and view all the answers

In the reaction HCl + NaOH --> H2O + NaCl, if 0.5 moles of HCl and 0.7 grams of NaOH are present, what determines the yield of NaCl?

The limiting reactant. Signup and view all the answers

How is the % composition of an element in a compound calculated?

Number of atoms times atomic weight divided by molecular weight of the compound, then multiplied by 100. Signup and view all the answers

What type of reaction is characterized by the release of heat?

Exothermic reaction Signup and view all the answers

In the combustion reaction of glucose, how many grams of CO2 are produced from 0.055 moles of C6H12O6?

14.52 grams. Signup and view all the answers

In which of the following reactions can one of the ions oxidize another?

Mixing hydrogen peroxide with manganese dioxide. Signup and view all the answers

What is the limiting reactant when 2 moles of A are reacted with 3 moles of B if the reaction requires 1 mole of A for every 2 moles of B?

Reactant A is the limiting reactant. Signup and view all the answers

Which of the following statements is true regarding soluble ionic compounds?

All nitrates and acetates are soluble in water. Signup and view all the answers

What is the heat of combustion?

Heat given off during a combustion reaction. Signup and view all the answers

Which of the following is true regarding the composition of water (H2O)?

%O is significantly higher than %H. Signup and view all the answers

When calculating the %Li in Li2O, what role does the atomic weight play?

It influences the total molecular weight of the compound. Signup and view all the answers

To predict if two ionic compounds in aqueous solution will react, which factor is most important?

The solubility of the ionic compounds. Signup and view all the answers

Study Notes

Stoichiometry & Chemical Reactions in Aqueous Solution

Learning Objectives: Solve stoichiometric problems, calculate percent composition, understand limiting reactants, understand heat of reaction, and predict if ions react in aqueous solution.

Moles and the Molecular Scale

Moles provide a connection between the molecular level and the real world.
One mole of any substance contains the same number of molecules as any other substance.
One mole of any substance has Avogadro's number of molecules (approximately 6.022 x 10²³).

Stoichiometric Calculations

Given a balanced chemical equation, one can determine the amounts of substances involved in a reaction.
The relationships between substances in a reaction are based on the balanced equation's coefficients.
To calculate the amount of one substance, relate it to the amount of another using the coefficients from the balanced equation.
The molecular weight(MW) of a substance can be found by adding the atomic weights of the elements in a compound(MW = g/mol)
The moles of substance is equal to the mass (g) divided by the MW (g/mol).

Limiting Reactants

The limiting reactant is entirely used up in a chemical reaction.
The limiting reactant determines the maximum amount of product that can be formed.
Excess reactants remain after the reaction is complete.

Heat of Reaction

The heat given off or absorbed during a reaction is the heat of reaction.
Exothermic reactions release heat.
Endothermic reactions absorb heat.

Predicting Reactions in Aqueous Solution

Many ionic compounds dissolve in water, separating into their component ions.
Reactions in aqueous solution occur when certain combinations of ions form precipitates, gases, or form water as a product.

Percent Composition

The percent composition of an element in a compound is the percentage of the compound's mass that comes from that element.
The percent composition of an element is (number of atoms x atomic weight / molecular weight) x 100.

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Description

Test your understanding of stoichiometry and chemical reactions in aqueous solutions. This quiz covers solving stoichiometric problems, calculating percent composition, identifying limiting reactants, and predicting ion reactions. Get ready to practice with balanced equations and molecular calculations!