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Lesson 8: Balancing Chemical Equations

Last updated over 2 years ago
35 questions

Balancing Chemical Equations

Objectives: Students will...
  • balance chemical equations.
As you complete this assignment, please take notes in a notebook when watching the attached videos.
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Chemical equations are balanced using coefficients. You cannot change a subscript to balance a chemical equation.

Determine the number of atoms of each type of element present in five of the following molecules: Ba(NO3)2

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Following along with your teacher, click on the 'show your work' box below and balance the equation.

Enter the coefficients in the following format:

a, b, c, d

where a is the first coefficient, b is the second, c is the third, and d is the fourth.

1

Following along with your teacher, click on the 'show your work' box below and balance the equation.

Enter the coefficients in the following format:

a, b, c, d

where a is the first coefficient, b is the second, c is the third, and d is the fourth.

1

Following along with your teacher, click on the 'show your work' box below and balance the equation.

Enter the coefficients in the following format:

a, b, c, d

where a is the first coefficient, b is the second, c is the third, and d is the fourth.

Part 3: Independent Practice

DIRECTIONS: For questions 20 - 27, determine the number of atoms in each of the formulas. See the example below:


Answer: 4, 2
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Na:___ O:___ H:___

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H:___ S:____

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Zn:___ Cl:___

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Al:___ S:___

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C:___ H:___ O:___

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Ba:___ C:___ H:___ O:___

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Sn:___ Cr:___ O:___

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N:___ O:___ H:___

Now that you've been introduced to balancing equations, it's time to do some practice. The key thing to remember about balancing chemical equations is that it is a trial and error process. Don't be afraid to try something, erase it, try something else, erase that, try another thing - you get the picture.

A few reminders and hints as you work through these...
  • You may only change the coefficients - never change the subscripts!
  • If polyatomic ions are on both sides of the equation, treat them as a unit and balance them first.
  • Balance the metals, then the nonmetals.
  • If the equation has O2 or H2, balance those last.
  • For combustion reactions, balance carbon first, hydrogen second, and oxygen last (C-H-O)
  • Make sure that the coefficients are in the most reduced ratio.
DIRECTIONS: Answer at least four questions between 28 - 34.
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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

DIRECTIONS: Answer at least six questions between 35 - 42. You may use the 'show your work' box if you like.

Type the coefficients in order with commas and spaces between, like this:

a, b, c, d
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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

DIRECTIONS: Answer at least five questions between 43 - 50. You may use the 'show your work' box if you like.

Type the coefficients in order with commas and spaces between, like this:

a, b, c, d
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What are the coefficients?

1

What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?

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What are the coefficients?