
Concept explainers
(a)
Interpretation:
The given chemical equation needs to be balanced.
Concept Introduction:
In a balanced equation, there are equal numbers of atoms of the elements on the reactant and the product side. This is due to the law of conservation of mass which
(a)

Answer to Problem 34A
The balanced chemical equation is
Explanation of Solution
The given reaction is a double decomposition reaction.
In order to balance the number of fluorine, F atoms on both sides, multiply hydrogen fluoride,
A quick inspection indicates that all there are equal numbers of atoms on both sides of the equation and hence, the reaction is balanced.
This trial and error approach works for simple equations; however, for more complex reactions, a proper method like the ion electron method must be used.
(b)
Interpretation:
The given chemical equation needs to be balanced.
Concept Introduction:
The law of conservation of mass indicates that all the atoms in a
(b)

Answer to Problem 34A
The balanced chemical equation is
Explanation of Solution
The unbalanced reaction is given as
In order to balance the number of potassium (K) atoms on both sides, multiply
Next balance the number of bromine, Br atoms on both sides.
Check that there are equal numbers of atoms of all the elements on both sides and hence, the reaction is balanced.
(c)
Interpretation:
The given chemical equation needs to be balanced.
Concept Introduction:As per the law of conservation of mass, there must be equal numbers of atoms of all the elements in a balanced chemical equation.
(c)

Answer to Problem 34A
The balanced chemical equation is
Explanation of Solution
The unbalanced reaction is
There are four chlorine, Cl atoms on the left and only one on the right. In order to balance the number of Cl atoms, multiply sodium chloride,
In order to balance the number of sodium, Na atoms on both sides, multiply Na on the left by 4.
The reaction has equal numbers of atoms of the elements on both sides and hence, the reaction is balanced.
(d)
Interpretation:
The given chemical equation needs to be balanced.
Concept Introduction:
The law of conservation of mass states that there are equal numbers of atoms on the reactant and the product side of a balanced chemical equation.
(d)

Answer to Problem 34A
The balanced chemical equation is
Explanation of Solution
The unbalanced chemical equation is
Note that there are equal numbers of atoms on both sides of the reaction and hence, the reaction is already balanced.
Chapter 7 Solutions
World of Chemistry
- Is (CH3)3NHBr an acidic or basic salt? What happens when dissolved in aqueous solution? Doesn't it lose a Br-? Does it interact with the water? Please advise.arrow_forwardThree pure compounds are formed when 1.00 g samples of element x combine with, respectively, 0.472 g, 0.630 g, and 0.789 g of element z. The first compound has the formula x2Z3. find the empricial formula of the other two compoundsarrow_forwardDraw the product and the mechanism A. excess H*; 人 OH H*; B. C. D. excess OH ✓ OH H*; H₂O 1. LDA 2. H*arrow_forward
- In reactions whose kinetic equation is v = k[A]m, the rate coefficient k is always positive. Is this correct?arrow_forwardIf the concentration of A decreases exponentially with time, what is the rate equation? (A). -d[A] (B). dt d[A] = k[A] e-kt dtarrow_forwardGiven the first-order reaction: aA → products. State its kinetic equation.arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY





