The video tutorial explains how to balance a chemical equation. It starts by setting up the equation with reactants on the left and products on the right. The tutorial then guides viewers on counting the number of atoms for each element on both sides of the equation. If the numbers are not equal, the equation is unbalanced. To balance it, coefficients are added to adjust the number of atoms on each side. The tutorial emphasizes that subscripts cannot be changed and are multiplied by the coefficient. Finally, it ensures that the number of atoms for each element is equal on both sides, achieving a balanced equation.

What is the first step in balancing a chemical equation?

• Count the number of atoms on each side

• Write out the given formula with reactants and products

• Change the subscripts of the elements

• Add coefficients to balance the equation

Where should the reactants be placed in a chemical equation?

• Below the arrow

• On the right side of the arrow

• On the left side of the arrow

• Above the arrow

How many hydrogen atoms are there on the left side of the equation H2 + O2 = H2O?

• 2

• 4

• 3

• 1

Tags

NGSS.MS-PS1-1

What is the number of oxygen atoms on the right side of the equation H2 + O2 = H2O?

• 1

• 2

• 4

• 3

Tags

NGSS.MS-PS1-5

Why is the equation H2 + O2 = H2O not balanced?

• The equation is already balanced

• The number of hydrogen atoms is not the same on both sides

• The number of oxygen atoms is not the same on both sides

• Both hydrogen and oxygen atoms are not balanced

Tags

NGSS.MS-PS1-5

What coefficient should be added before H2O to balance the oxygen atoms in the equation H2 + O2 = H2O?

• 2

• 1

• 4

• 3

After adding the coefficient 2 before H2O, how many hydrogen atoms are on the right side of the equation?

• 2

• 8

• 4

• 6

Tags

NGSS.MS-PS1-1

What coefficient should be added before H2 on the left side to balance the hydrogen atoms in the equation 2H2 + O2 = 2H2O?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What is assumed if there is no coefficient in front of an element in a balanced equation?

• The coefficient is 3

• The coefficient is 2

• The coefficient is 1

• The coefficient is 0

Tags

NGSS.MS-PS1-5