Chemical Equations 7.2.2

Chemical Equations
Lesson 7.2.2

By Laura O'Neill

Draw

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Match

Match the following terms to their definitions. All terms have been discussed in previous lessons.

• compound

• coefficient

• subscript

• chemical equation

a substance of 2 or more elements bonded

a number placed in front of a compound

small number placed below letters : X₂

a model to show chemical reactions

• a substance of 2 or more elements bonded

• a number placed in front of a compound

• small number placed below letters : X₂

• a model to show chemical reactions

Draw

What do math and chemical equations have in common?

How are they different?

Notebook
Page 147

​a number placed in from of an element in a chemical formula

Coefficient

​A substance that enters a chemical reaction.
The left side of the chemical formula!

​​Reactant

​A substance created during a chemical reaction.

The right side of the chemical formula!

​​Product

​To produce

The arrow in the chemical equation.

Yield

Reactants go in to create reaction

​Yield is the arrow

​Product is produced by reaction

Hotspot

Identify the reactants of the equation?

Coefficient

​Subscript

​A chemical equation can have only coefficients, only subscripts or a combination of both.

Hotspot

Which portion of the chemical equation has a subscript?

Hotspot

Which part of the chemical equation has a coefficient?

​​means and or combines with

​​means yields or produces

​​if there is no coefficient, then it is a 1

You read the chemical equation like a sentence

​One molecule of N₂ combines with three molecules of H₂ to produce two molecules of NH₃. ​

How would you read this equation?

Hotspot

Which sentence correctly describes the equation?

Zn + 2HCl --> H₂ + ZnCl₂

Chemists use coefficients in chemical equations to follow the law of conservation of mass.

​​The subscript tells us there are 2 atoms of nitrogen.

​​The coefficient tells us there are 3 atoms of hydrogen.

​​But what if there is both?
You have 3 molecules of H₂ OR 3X2=6 atoms of hydrogen.

​Nitrogen is
2 X 1 = 2 atoms of nitrogen
Hydrogen is
2 X 3 = 6 atoms of hydrogen.

​2Fe₂O₃

How many atoms of each element?

Iron =

Oxygen =

​How many atoms?

Aluminum =

Oxygen =

​4Al₂O₃

Match

Match the element to the number of atoms in the formula: 4C₂H₄O

• carbon

• hydrogen

• oxygen

8

16

4

• 8

• 16

• 4

Carbon = Carbon =

Hydrogen = Hydrogen =

Oxygen = Oxygen =

​CH₄ + O₂ --> CO₂ + H₂O

Draw

Balance the Equation

​CHALLENGE

Multiple Choice

How many atoms of sulfur are in 3H₂S

• 1

• 3

• 5

• 6

Draw

How are Math equations and Chemical Equations Similar and how are they different?

Math - 2a + 5 = 16

Chemical - Fe + O₂ -> FeO₂

​Super job Today!

See you Tomorrow for more Balancing equations

Click on the link below and add a post to the Padlet on ONE term of your choosing:

- give a definition in your own words
- add a picture or gif to represent your term

​

Padlet link

​Review Vocabulary

​Coefficient

Labelling

Label the chemical equation with the terms listed. Place the labels on the circles.

Drag labels to their correct position on the image

Reactants

Coefficient

Subscript

Yield Sign

Products