Counting atoms and balancing equations

Front

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed in front of the compounds in a chemical equation to indicate the number of molecules or moles of that substance.

Tags

NGSS.HS-PS1-7

Front

Where are coefficients located in a chemical equation?

Back

Coefficients are located at the very front of the equation.

Front

What does the law of conservation of matter state?

Back

The law of conservation of matter states that atoms are neither created nor destroyed in chemical reactions.

Tags

NGSS.HS-PS1-7

Front

What do subscripts in a chemical formula represent?

Back

Subscripts represent how many of that specific element are included in the compound.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the balanced equation for Al + HCl -> H2 + AlCl3?

Back

The balanced equation is 2Al + 6HCl -> 3H2 + 2AlCl3.

Tags

NGSS.HS-PS1-7

Front

What are the coefficients that balance the equation AgNO3 + H2S -> Ag2S + HNO3?

Back

The coefficients that balance the equation are 2, 1 -> 1, 2.

Tags

NGSS.HS-PS1-7

Front

What is the purpose of balancing chemical equations?

Back

The purpose of balancing chemical equations is to ensure that the law of conservation of mass is upheld, meaning the same number of each type of atom is present on both sides of the equation.

Tags

NGSS.HS-PS1-7

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their coefficients.

Tags

NGSS.HS-PS1-7

Front

What is the difference between a coefficient and a subscript?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms of an element in a molecule.