Double Replacement

Reactions Review

Review on different types of reaction

• Combustion

• Single Replacement

• Synthesis

• Double Replacement

Combustion Reactions

• React with oxygen

• Produce water and carbon dioxide

• Usually produce light or heat (Fire, explosions)

Single Replacement reactions

• a reaction in which one element is substituted for another element in a compound

• One element trades places with another element

• 
  

Synthesis Reactions

• Two or more elements form a product

• New product is formed

Multiple Choice

Which of the following is a single replacement reaction?

• 2 S + 3 O₂ ---------> 2 SO₃

• 2K + 2H₂O → 2KOH + H

• CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

• H2SO4 + BaCl2 → HCl + BaSO4

Multiple Choice

Which of the following is a combustion reaction?

• 2 S + 3 O₂ ---------> 2 SO₃

• 2K + 2H₂O → 2KOH + H

• CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

• H2SO4 + BaCl2 → HCl + BaSO4

Multiple Choice

Which of the following is a synthesis reaction?

• 2 S + 3 O₂ ---> 2 SO₃

• 2K + 2H₂O → 2KOH + H

• CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

• H2SO4 + BaCl2 → HCl + BaSO4

What is a double replacement reaction?

• In double replacement reactions, elements “swap” places with other elements to form new compound

  
  

• Two compounds react to form two new compounds.

Multiple Choice

Let's look at this reaction
 $H_2SO_4+BaCl_2$   ----> ?

Which side of the equation are the reactants?

• Left

• Right

H₂SO₄ + BaCl₂ ----> ???

In double replacement reactions, elements trade places to form new products. Sometimes they form what is called a precipitate

Multiple Choice

What is a precipitate?

• The left side of the chemical equation

• The solid product of a reaction

• A solution

• What kind of reaction it is

H₂SO₄ + BaCl₂----> ???

• So, what would this reaction look like once the reaction takes place?

• Will a precipitate form?

Fill in the Blank

What would be the products once the reaction takes place?

H2SO4 + BaCl2 → ????

 $H_2SO_4+BaCl_2→HCl+BaSO_4$  

HCl and BaSO4 are the products! But does it form a precipitate?

Using the solubility chart, does a precipitate form?

 $H_2SO_4+BaCl_2→HCl+BaSO_4$  

Your turn! Look at the following reaction and predict the precipitate

AgNO3 + KCl → AgCl + KNO3

H2SO4+BaCl2​→HCl+BaSO4
​
 

Multiple Choice

 $H_2SO_4+BaCl_2→HCl+BaSO_4$  Does a precipitate form?

• Yes

• No

Precipitates are marked as (s) for solid. This shows that Silver Chloride (AgCl) is solid once the reaction takes place.

AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃(aq)

When compounds are soluble or dissolved in water, then they are aqueous (aq)

AgNO₃ (aq) + KCl (aq) → AgCl (s) + KNO₃(aq)

Multiple Choice

What are aqeous solutions?

• A soluble compound dissolved in water

• A gaseous form of matter

• The product of a reaction

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