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Solved: This molecular drawing shows images of methane molecules and oxygen molecules

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 116P Chapter 3

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 116P

This molecular drawing shows images of methane molecules and oxygen molecules before and after a change. Was the change chemical or physical?

Step-by-Step Solution:
Step 1 of 3

Solution 116P

In this reaction, Methane and Oxygen chemically change into Carbon Dioxide (a greenhouse gas), Water, and release lots of thermal energy in the process. That's what happens in your gas furnace when you heat your home.

Let s take a good look at this reaction two ways, with words and with chemical symbols.

Reactants

 

Products

Methane +

Oxygen +

Thermal energy

Produces

Carbon dioxide +

Water +

Particulate "Unburned" Matter +

Light & Thermal Energy

 

CH4 +

2O2 +

Thermal energy

=>

CO2 +

2H2O +

PM +

Light & Thermal Energy

1

molecule

2

molecules

=>

1

molecule

2

molecules

Note:

1. When one molecule of Methane is burned (reacts) with two molecules of Oxygen the products of the reaction are one molecule of CO2 and two molecules of H20.

2. Two entirely different substances are produced in this balanced reaction, but the same amount of matter remains! Let's check this by adding up the type and total of the atoms on each side of the equation.

Reactants =>

Products

Amount of Carbon atoms

C=1

C=1

The same

Amount of Hydrogen atoms

H=4

H=4

The same!

Amount of Oxygen atoms

O=4

O=4

The same!!

This shows an example of the Law of the Conservation of Matter. The Law states "During an ordinary chemical change, there is no detectable increase or decrease in the quantity of matter."

Step 2 of 3

Chapter 3, Problem 116P is Solved
Step 3 of 3

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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Solved: This molecular drawing shows images of methane molecules and oxygen molecules