Balancing Equations

Front

What are subscripts in a chemical equation?

Back

Subscripts are the small numbers written to the right of a chemical symbol that indicate the number of atoms of that element in a molecule.

Front

In the reaction 2H₂ + O₂ → 2H₂O, how many molecules of water are produced?

Back

2 molecules of water.

Tags

NGSS.MS-PS1-5

Front

What is a coefficient in a chemical equation?

Back

A coefficient is the large number placed to the left of a chemical formula that indicates how many molecules of that substance are involved in the reaction.

Tags

NGSS.MS-PS1-5

Front

How many Magnesium atoms are in 10MgCl₂?

Back

10 Magnesium atoms.

Tags

NGSS.MS-PS1-1

Front

What is the little number after an element in a chemical equation called?

Back

Subscript.

Front

What does the equation 2H₂ + O₂ → 2H₂O represent?

Back

It represents the chemical reaction of hydrogen and oxygen to form water.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation, following the law of conservation of mass.

Tags

NGSS.MS-PS1-5

Front

What does it mean if a chemical equation is unbalanced?

Back

It means that the number of atoms of one or more elements is not the same on both sides of the equation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

In the equation 4Fe + 3O₂ → 2Fe₂O₃, what do the numbers 4 and 3 represent?

Back

They are coefficients indicating the number of moles of iron (Fe) and oxygen (O₂) used in the reaction.

Tags

NGSS.MS-PS1-5

Front

What is the significance of the number 2 in 2H₂O?

Back

It indicates that there are 2 molecules of water.

Tags

NGSS.MS-PS1-1