Counting atoms pt 1

SWBAT: Understand components of Chemical Formulas. ​

Chemical Formulas

Coefficient- tells you the number of Molecules there is.

Subscripts- # of atoms of the element it has.

QUESTION: How many Molecules in this equation?

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​Components of an equation

Coefficient- tells you the number of Molecules there is.

Subscripts- # of atoms of the element it has.

Reactants= substance that undergoes change.

Products= The final substance after the change.

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Multiple Choice

2H₂O

How many H₂O molecules are present?

• 1

• 4

• 2

• 8

Multiple Choice

How many MOLECULES are on the PRODUCT side of the chemical equation NaOH + HCl --> NaCl + H₂O

• 1

• 2

• 4

• 5

Coefficients And Subscripts

The 5 coefficient means there are five H₂Os

H₂O + H₂O + H₂O + H₂O + H₂O

So all atoms in H₂O are muliplied by 5

Subscripts tells you the amount of atoms per element.

The REACTANTS are the starting atoms. Basically the reactants mix together and REACT! The PRODUCTS are what you end up with after the chemical reaction occurs. The atoms rearrange to make something new. The something NEW are the PRODUCTS.

Use RAP to memorize which part of the chemical equation are the reactants and which part are the products

​Always work with a T chart.

Multiple Choice

How many ELEMENTS are in the this chemical equation?

• 1

• 3

• 24

• 27

Multiple Choice

How many ELEMENTS are in this chemical equation?

• 3

• 4

• 9

• 10

Multiple Choice

How many ATOMS of hydrogen (H) are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

How many TOTAL ATOMS are in this chemical equation?

• 3

• 6

• 12

• 24

Multiple Choice

How many TOTAL ATOMS are in this chemical equation?

• 3

• 4

• 9

• 17

• 21

Multiple Choice

How many TOTAL ATOMS are in the chemical formula 4O₂ ?

• 2

• 4

• 6

• 8

Multiple Choice

Cu + 2AgNO3 $$\longrightarrow$$ 2Ag + Cu(NO3)2
How many copper (Cu) atoms are there in 
Cu(NO3)2 ?

• 1

• 2

• 5

• 6

Multiple Choice

How many atoms are there TOTAL in:
H₂SO₄

• 6

• 5

• 7

• 3