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Chapter 7: Q. 7.67 (page 249)

a. Why do chemical reactions require energy of activation ?

b. In an exothermic reaction, is the energy of the products higher or lower than that of the reactants?

c. Draw an energy diagram for an exothermic reaction.

Short Answer

Expert verified

(a) To begin, you'll need activation energy. For reactants to move together, activation energy is required.

(b) In exothermic reaction the energy of product is lower than the reactant.

(c) Graph is given below.

Step by step solution

01

Part(a) Step 1: Given information

We have to find out the why do chemical reactions require energy of activation.

02

Part(a) Step 2: Explanation

To begin, all chemical reactions, including exothermic reactions, require activation energy. Activation energy is needed for reactants to move together and start breaking bonds. The quantity of free energy that must be added to get from the energy level of the reactants to the energy level of the transition state is the activation energy for the forward reaction.

03

Part(b) Step 1: Given information

We have to find out that energy of products is higher or lower than reactants or not.

04

Part(b) Step 2: Explanation

We know that, In Exothermic reaction, the energy of the product is lower than the energy of the reactants. Therefore, in exothermic reactions, heat is released.

05

Part(c) Step 1: Given information

We have been given,

As per question demand we draw a graph of exothermic reaction.

06

Part(c) Step 2: Explanation

Now, we draw a graph of exothermic reaction,

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Most popular questions from this chapter

A dandruff shampoo contains dipyrithione,C10H8N2O2S2, which acts as an antibacterial and antifungal agent.

  1. What is the molar mass of dipyrithione?
  2. How many moles of dipyrithione are in 25.0g?

  3. How many moles of Care in localid="1653459359665" 25.0gof dipyrithione?

  4. How many moles of dipyrithione contain localid="1652950310084" 8.2×1024atoms of N?

If green sphere represents the chlorine atoms and red sphere represents the oxygen atoms and all are gases.

  1. Write the formula for each of the reactants and products.
  2. Write the balanced equation.
  3. Indicate the type of reaction as combination, decomposition, single replacement, double replacement, or combustion.

Balance each of the following chemical equations, and identify the type of reaction: (7.4,7.5)

a.data-custom-editor="chemistry" NH3(g)+HCl(g)→NH4Cl(s)

b.role="math" localid="1652567183408" C4H8(g)+O2(g)→∆CO2(g)+H2O(g)

c.data-custom-editor="chemistry" Sb(s)+Cl2(g)→SbCl3(s)

d. data-custom-editor="chemistry" NI3(s)→N2(g)+I2(g)

e.data-custom-editor="chemistry" KBr(aq)+Cl2(aq)→KCl(aq)+Br2(l)

f.data-custom-editor="chemistry" Fe(s)+H2SO4(aq)→H2(g)+Fe2(SO4)3(aq)

g.data-custom-editor="chemistry" Al2(SO4)3(aq)+NaOH(aq)→Al(OH)3(s)+Na2SO4(aq)

If red spheres represent oxygen atoms, blue spheres represent nitrogen atoms, and all the Molecules are gases,

  1. Write the formula for each of the reactants and products.
  2. Write a balanced equation for the reaction.
  3. Indicate the type of reaction as combination, decomposition, single replacement, double replacement, or combustion.

Consider the following unbalanced equation: (7.4,7.5,7.7,7.8)

Al(s)+O2(g)→Al2O3(s)

a. Write the balanced chemical equation.

b. Identify the type of reaction.

c. How many moles of O2are needed to react with localid="1653475915594" 4.50mole of Al?

d. How many grams of Al2O3are produced when localid="1653475936440" 50.2gof Alreacts?

e. When Alis reacted with localid="1653475950535" 8.00gof O2, how many grams of Al2O3can form?
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