Balancing Equations

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

What does a coefficient represent in a chemical equation?

Back

A coefficient indicates the number of molecules or moles of a substance involved in a reaction.

Front

What is the purpose of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is followed, meaning that matter is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

How many atoms of oxygen are in the equation: 2H₂ + O₂ --> 2H₂O?

Back

There are 2 atoms of oxygen on the left side and 2 atoms of oxygen on the right side, making it balanced.

Tags

NGSS.MS-PS1-5

Front

What is the first step in balancing a chemical equation?

Back

The first step is to write down the number of atoms of each element present in the reactants and products.

Front

What does it mean if a chemical equation is unbalanced?

Back

An unbalanced equation means that the number of atoms of one or more elements is different on the reactant and product sides, violating the conservation of mass.

Tags

NGSS.MS-PS1-5

Front

In the equation: 4Al + 3O₂ --> 2Al₂O₃, how many aluminum atoms are present?

Back

There are 4 aluminum atoms on the left side and 4 aluminum atoms on the right side.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

What is a subscript in a chemical formula?

Back

A subscript indicates the number of atoms of an element in a molecule. For example, in H₂O, the '2' indicates there are two hydrogen atoms.

Tags

NGSS.MS-PS1-1

Front

How do you balance the equation: _N₂ + _H₂ --> _NH₃?

Back

The balanced equation is: 1N₂ + 3H₂ --> 2NH₃.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the yield in a chemical reaction?

Back

Yield refers to the amount of product formed in a chemical reaction, often expressed as a percentage of the theoretical maximum.

Tags

NGSS.HS-PS1-6