Coefficients

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number in front of a chemical formula.

• The number in between the chemical symbols.

• The number behind a chemical formula.

Determine the coefficients to make the following equation balanced?

__N₂ + __O₂--> __NO

• 1, 1, 1

• 1, 1, 2

• 2, 2, 2

• 1, 2, 2

Tags

NGSS.MS-PS1-5

How many HCl molecules are needed to balance the equation? Mg + __HCl ---> MgCl₂ + H₂

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Determine the coefficients to balance the equation.

__Al +__HCl --> __H₂ +__AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Tags

NGSS.MS-PS1-5

Determine the coefficients to balance the chemical equation.

• 4, 1, 2

• 4, 3, 4

• 3, 4, 1

• 4, 3, 2

Tags

NGSS.MS-PS1-5

Balance the the following equation.

__Zn+__HCl -->__ZnCl₂ +__H₂

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Tags

NGSS.MS-PS1-5

The coefficient in 3H₂O is:

• 3

• 8

• 1

• 2

In a balanced chemical equation, what does the coefficient represent?

• The number of molecules or moles of a substance

• The atomic number of an element

• The mass of a single molecule

• The charge of an ion

Tags

NGSS.MS-PS1-5

Which of the following is true about coefficients in a chemical reaction?

• They indicate the ratio of reactants to products

• They are always equal to the subscripts

• They are used to balance charges

• They are only used for gases

Tags

NGSS.MS-PS1-5