Writing Chemical Equations

Presentation

•

Science

•

12th Grade

•

Medium

•

NGSS

MS-ESS1-1, MS-PS1-1, MS-PS1-2

+13

Standards-aligned

Stacy King

Used 5+ times

FREE Resource

10 Slides • 10 Questions

Review Questions

Multiple Choice

The reactants are on the left side of the chemical equation.

True

False

Multiple Choice

Two clear colorless solutions were combined.
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

One of the original compounds came out of solution

The solutions reacted chemically

Some of the water froze into ice crystals

Rapid evaporation of water occurred, leaving a solid

Multiple Choice

In a ___________change, a substance changes into a different substance.

Physical

Chemical

Multiple Choice

How many Sodium (Na) are in 6NaCl?

Multiple Choice

How many Hydrogen are in 4H₂O?

Writing Chemical Equations

We Will
1 Define
2. Symbolism
3. Alternate Word and Chemical EQ forms
I Will
Practice and Apply what I have learned

Definitions

Word equation:

Describes a chemical reaction using the names of the reactants and products.

Chemical equation:

Describes a chemical reaction using the chemical formulas of the reactants and products.

Word versus Chemical Equations

Write the word equation for the reaction of methane and oxygen gas to form carbon dioxide and water vapor.

Multiple Choice

True/False: There are 2 reactants in the chemical equation below.
$H_2\ +\ Cl_{2\ }\rightarrow\ HCl\$

True

False

Multiple Choice

Translate the word equation below:

Nitrogen reacts with Hydrogen to form Ammonia (NH₃).

$N\ \ \rightarrow\ H\ +\ NH_3$

$N_2\ +\ H_2\ \rightarrow\ NH_3$

$N\ +\ H\ \rightarrow\ NH_3$

$N_2\ \rightarrow\ H_2\ +\ NH_3$

Chemical Symbolism in States of Matter

Symbol	Meaning
(s)	Solid
(l)	Liquid
(g)	Gas
(aq)	Aqueous

Multiple Choice

What does the symbol "(s)" mean in the chemical equation?

CaO(s) + H₂O(l) --> Ca(OH)₂(s)

CaO is a solid

CaO is a liquid

CaO is a gas

gas is produced

Symbols Used When Writing Equations

Write the word equation for the reaction of methane and oxygen gas to form carbon dioxide and water vapor.

Let’s look at the problem again.

Symbol	Meaning
	Yields
	Reversible
	Precipitate
	Gas

Symbols Used When Writing Equations

Multiple Choice

A reversible reaction is signified by which symbol?

Symbols Used When Writing Equations

Draw

Draw a symbol that indicates a change in heat in the chemical equation below.

CaCo_{3 (s)} ---- CaO_(s) + CO_{2 (g)}

Let's try One Together

When solid copper (II) carbonate is heated, it produces solid copper (II) oxide and carbon dioxide gas. Write the chemical reaction equation.

Let's try One Together

Review Questions

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