17/10: Chemical equations

• Chemistry
• Secondary Education

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CHEMISTRY 10

                   19: Chemical equations

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CHEMISTRY 10

                   19: Chemical equations

write word equations and symbol equations to show how reactants form products with state symbols

deduce the symbol equation with state symbols for a chemical reaction, given relevant information

assess my thinking and how I learn to identify growth areas and improve my learning.

Practice your skill:

What is the relative formula mass of:

• calcium carbonate,
  
• potassium sulfate?

What is the relative molecular mass of:

• ammonia,
• carbon tetrachloride?

Share your thought process in calculating the relative molecular/formula mass.

Assess your skill:

Choose two only. Two marks in total.

Calculate the Mᵣ of one of the following:

• oxygen gas (if you choose this, choose two more)
• carbon dioxide (if you choose this, choose two more except oxygen)
• magnesium oxide
• ammonium nitrate
• propanol, C₃H₇OH

Calculate the relative molecular/formula mass of ionic and covalent substances 

I can calculate ionic and covalent substances' relative molecular/formula mass. 

Yes, I can confidently do it.

Yes, I can but need more practice.

No, I lack confidence so I need more practice or ask help from my teacher.

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CHEMISTRY 10

                   19: Chemical equations

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

potassium + water → potassium hydroxide + hydrogen

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

potassium + water → potassium hydroxide + hydrogen

Word equation

Try this!

Given the description of the chemical reaction, write a word equation.

Chemical reaction

Potassium reacts vigorously when it comes in contact with water, producing potassium hydroxide and hydrogen gas.

potassium + water → potassium hydroxide + hydrogen

Word equation

Reactant 1

Product 1

Product 2

Reactant 2

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

Word equation

Symbol equation

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

Word equation

Symbol equation

Symbol equation with state symbols

How can you make a word equation easier and shorter to write?

potassium + water → potassium hydroxide + hydrogen

K + H₂O → KOH + H₂

K(s) + H₂O (l) → KOH(aq) + H₂ (g)

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

Word equation

Symbol equation

Symbol equation with state symbols

Balanced symbol equation with state symbols

Balanced chemical (symbol) equation

• a summary of a chemical reaction using chemical formulae
• the total number of atoms involved is the same on both the reactant and product sides of the equation

Balanced chemical (symbol) equation

• a summary of a chemical reaction using chemical formulae
• the total number of atoms involved is the same on both the reactant and product sides of the equation

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

Balanced chemical (symbol) equation

• a summary of a chemical reaction using chemical formulae
• the total number of atoms involved is the same on both the reactant and product sides of the equation

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

Balanced chemical (symbol) equation

• a summary of a chemical reaction using chemical formulae
• the total number of atoms involved is the same on both the reactant and product sides of the equation

2K(s) + 2H₂O (l) → 2KOH(aq) + H₂ (g)

REACTANTS

PRODUCTS

K = 2 X 1 = 2

H = 2 X 2 = 4

O = 2 X 1 = 2

K = 2 X 1 = 2

H = 2 X 1 = 2   +    H = 2

O = 2 X 1 = 2

Write word equations and symbol equations to show how reactants form products with state symbols.

I can write word equations and symbol equations to show how reactants form products with state symbols

Yes, I can confidently do it.

Yes, I can but need more practice.

No, I lack confidence so I need more practice or ask help from my teacher.

Sample 1

• Iron rusts because it reacts with oxygen in the air to form a compound called iron (III) oxide.

a chemical reaction → a word equation → a symbol equation with state symbols → balanced symbol equation

Sample 2

• 2NaOH (solid) + H₂SO₄ (aqueous) → Na₂SO₄ (aqueous)+ 2H₂O (liquid)

a chemical reaction ⬅️ a word equation ⬅️ a symbol equation with state symbols ⬅️ balanced symbol equation

Practice your skill:

Part 1. Choose one only.

(a) Sodium reacts vigorously with water to give a sodium hydroxide solution; hydrogen gas is also given off.

(b) A white precipitate is formed when silver nitrate is added to sodium chloride solution. This white precipitate is silver chloride, which is highly insoluble in water. This is why silver nitrate solution is used to detect the presence of halide ions.

a chemical reaction → a word equation → a symbol equation with state symbols → balanced symbol equation

Practice your skill:

Part 2. Choose one only.

 (a) 2K (solid) + 2HCl (liquid) → 2KCl (aqueous) + H₂ (gas)

 (b) 2Al (solid) + 3Cl₂ (gas) → 2AlCl₃ (solid) 

a chemical reaction ⬅️ a word equation ⬅️ a symbol equation with state symbols ⬅️ balanced symbol equation

Share your thought process in calculating the relative molecular/formula mass.

Deduce the symbol equation with state symbols for a chemical reaction, given relevant information

I can deduce the symbol equation with state symbols for a chemical reaction, given relevant information

Yes, I can confidently do it.

Yes, I can but need more practice.

No, I lack confidence so I need more practice or ask help from my teacher.

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