Balancing Chemical Equations: A Comprehensive Guide

This video tutorial by Mr. Donny covers the fundamentals of balancing chemical equations, emphasizing the law of conservation of matter. It provides a detailed, step-by-step guide on how to balance equations, ensuring that the number of atoms for each element is equal on both sides. The tutorial also includes advanced techniques and tricks for more complex equations, followed by practice problems and solutions to reinforce learning.

What does the law of conservation of matter state?

• Matter can change forms without any restrictions.

• Energy can be converted into matter.

• Matter cannot be created or destroyed in an isolated system.

• Matter can be created and destroyed.

Tags

NGSS.MS-PS1-5

What is the first step in balancing a chemical equation?

• Add coefficients randomly.

• Change the subscripts of the compounds.

• Remove elements that are not balanced.

• Create an inventory of elements in reactants and products.

Tags

NGSS.MS-PS1-5

How do you balance the number of carbons in the equation C6H12O6 + O2 → CO2 + H2O?

• Add a coefficient of 6 in front of CO2.

• Add a coefficient of 12 in front of H2O.

• Add a coefficient of 6 in front of O2.

• Add a coefficient of 1 in front of C6H12O6.

Tags

NGSS.MS-PS1-5

What should you do if all your coefficients are multiples of two?

• Leave the coefficients as they are.

• Divide all coefficients by two.

• Multiply all coefficients by two.

• Add two to each coefficient.

What is a useful trick when you can only count by threes on one side and twos on the other?

• Change the subscripts of the compounds.

• Ignore the imbalance.

• Find a common multiple for each of them.

• Use a fractional coefficient.

How can you balance an equation if you need an odd number of oxygen atoms but can only count by twos?

• Ignore the imbalance and move on.

• Change the subscripts of the oxygen compound.

• Add one to the coefficient of O2.

• Use a fractional coefficient and then multiply by the denominator.

In the equation Al + O2 → Al2O3, what coefficient should be placed in front of O2 to balance the oxygens?

• 4

• 1

• 2

• 3

Tags

NGSS.MS-PS1-5

What is the balanced form of the equation C6H14 + O2 → CO2 + H2O?

• C6H14 + 19/2 O2 → 6 CO2 + 7 H2O

• 2 C6H14 + 19 O2 → 12 CO2 + 14 H2O

• C6H14 + 7 O2 → 6 CO2 + 7 H2O

• 2 C6H14 + 12 O2 → 6 CO2 + 14 H2O

Tags

NGSS.MS-PS1-5

What should you do after balancing an equation to ensure it is in the simplest form?

• Add one to each coefficient.

• Change the subscripts of the compounds.

• Multiply all coefficients by two.

• Check if all coefficients can be divided by a common factor.

In the equation H2SO4 + B(OH)3 → B2(SO4)3 + H2O, what is the total number of hydrogen atoms on the reactant side?

• 2

• 3

• 5

• 6

Tags

NGSS.MS-PS1-1