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Concept explainers
Balance each of the following chemical equations.
msp;
msp;
msp;
msp;
msp;
msp;
msp;
![Check Mark](/static/check-mark.png)
(a)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided reaction is:
The most complicated molecule is not clear, so we start arbitrarily. If we place a coefficient of 2NaCl, we get a balanced equation.
![Check Mark](/static/check-mark.png)
(b)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The given unbalanced equation is:
We start with placing 3 before Fe and 4 before H2 O and H2 We get the balanced chemical reaction as follows:
![Check Mark](/static/check-mark.png)
(c)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The given unbalanced equation is:
We start by balancing HCl. If we place a coefficient 2 before HCl
If we place 2 before H2 O, we get a balanced chemical reaction as follows:
![Check Mark](/static/check-mark.png)
(d)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided equation is:
If we place a coefficient of 2 H2 O and HBr, we get a balanced equation.
![Check Mark](/static/check-mark.png)
(e)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided equation is:
We start with NaOH. To balance Na. If we place a coefficient of 3 before NaOH
To balance oxygen, we place 3 before H2 O. We get the balanced chemical reaction as follows:
![Check Mark](/static/check-mark.png)
(f)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided reaction is:
To balance oxygen, we can start by placing 2 before NaNO2 and NaNO3. Now, we already have a balanced equation.
![Check Mark](/static/check-mark.png)
(g)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided reaction is:
We start with balancing
Now we can place 4 before NaOH and 2 before H2 O. We have a balanced equation
![Check Mark](/static/check-mark.png)
(h)
Interpretation:
The given chemical equation is to be balanced.
Concept Introduction:
In a balanced chemical reaction, the number of similar type of elements on both sides of the reaction is equal. To balance an unbalanced equation, the coefficients that are present before the compounds are changed but the subscripts in the formulas are not changed.
Answer to Problem 40QAP
Explanation of Solution
The provided reaction is:
Now we place 4 before Si and we have a balanced equation.
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Chapter 6 Solutions
Introductory Chemistry: A Foundation
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- Use the appropriate tables to calculate H for (a) the reaction between copper(II) oxide and carbon monoxide to give copper metal and carbon dioxide. (b) the decomposition of one mole of methyl alcohol (CH3OH) to methane and oxygen gases.arrow_forwardShould heat be added as a reactant or as a product to each of the following equations for chemical reactions based on the given thermicity for the reaction? a. 2SO2 + O2 2SO3 (exothermic) b. N2 + O2 2NO (endothermic) c. CH4 + 2O2 CO2 + 2H2O (exothermic) d. 2H2O + 2Cl2 4HCl + O2 (endothermic)arrow_forwardGraphite is burned in oxygen to give carbon monoxide and carbon dioxide. If the product mixture is 33% CO and 67% CO2 by mass, what is the heat from the combustion of 1.00 g of graphite?arrow_forward
- Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) Is the reaction endothermic or exothermic?arrow_forwardWhen one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon tetrafluoride gases are formed and 2496.7 kJ of heat are given off. What is Hf for CF4(g)?arrow_forwardShould heat be added as a reactant or as a product to each of the following equations for chemical reactions based on the given thermicity for the reaction? a. H2 + Cl2 2HCl (exothermic) b. 4NO + 6H2O 4NH3 + 5O2 (endothermic) c. 2H2O + 2Cl2 4HCl + O2 (endothermic) d. 2H2O 2H2 + O2 (exothermic)arrow_forward
- Write the equation for the reaction, if any, that occurs when each of the following experiments is performed under standard conditions. (a) Sulfur is added to mercury. (b) Manganese dioxide in acidic solution is added to liquid mercury. (c) Aluminum metal is added to a solution of potassium ions.arrow_forwardChlorine dioxide, ClO2, is a reddish yellow gas used in bleaching paper pulp. The average speed of a ClO2 molecule at 25C is 306 m/s. What is the kinetic energy (in joules) of a ClO2 molecule moving at this speed?arrow_forwardOne of the components of polluted air is NO. It is formed in the high-temperature environment of internal combustion engines by the following reaction: N2(g)+O2(g)2NO(g)H=180KJ Why are high temperatures needed to convert N2 and O2 to NO?arrow_forward
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