Balancing Chemical Equations in Reactions and Stoichiometry

This video tutorial covers the basics of balancing chemical equations, emphasizing the conservation of mass, energy, and charge. It provides step-by-step examples of balancing equations involving hydrogen, oxygen, phosphorus, and carbon. The tutorial explains how to use coefficients and subscripts to ensure the same number of atoms on both sides of the equation, ensuring the equation is balanced.

What are the three things that are conserved when balancing a chemical equation?

• Energy, volume, and charge

• Mass, energy, and volume

• Mass, volume, and charge

• Mass, energy, and charge

Tags

NGSS.MS-PS1-5

In a chemical equation, what do the reactants represent?

• The substances formed as a result of the reaction

• The substances that are used up in the reaction

• The substances that are catalysts in the reaction

• The substances that are conserved in the reaction

Tags

NGSS.MS-PS1-5

How do you determine the number of hydrogen atoms in H2O when balancing equations?

• By subtracting the subscript from the coefficient

• By adding the coefficient and the subscript

• By dividing the coefficient by the subscript

• By multiplying the coefficient and the subscript

Tags

NGSS.MS-PS1-5

What is the first step in balancing a chemical equation?

• Balancing the element with the smallest subscript

• Balancing the element with the largest coefficient

• Balancing the element with the largest subscript

• Balancing the element with the smallest coefficient

If you have 4 phosphorus atoms on the reactant side, how many should you have on the product side?

• 8

• 2

• 6

• 4

Tags

NGSS.MS-PS1-5

When balancing oxygen in the equation P4 + O2 -> P2O5, what coefficient should be added to O2 to balance 10 oxygens on the product side?

• 2

• 5

• 3

• 4

In the equation C3H8 + O2 -> CO2 + H2O, what is the coefficient for H2O to balance 8 hydrogens?

• 5

• 4

• 3

• 2

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many carbons are on the reactant side in the equation C3H8 + O2 -> CO2 + H2O?

• 3

• 2

• 4

• 1

What is the total number of oxygens on the product side in the equation C3H8 + O2 -> CO2 + H2O?

• 12

• 10

• 8

• 6

Tags

NGSS.MS-PS1-5

What is the final step in balancing a chemical equation?

• Ensuring all elements have the same number of atoms on both sides

• Ensuring all coefficients are even numbers

• Balancing the element with the smallest subscript

• Balancing the element with the largest subscript