Chemical reactions tutorial
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Chemical reactions tutorial. Let’s get started!!. Goals. In this tutorial, you will learn… How to recognize 3 of the 5 types of reactions Predict the products of reactions when only given the reactants. What are the 5 types of reactions?. Which 3 will be we learning about??. SYNTHESIS.

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Chemical reactions tutorial

Chemical reactions tutorial

Let’s get started!!


Goals

Goals

In this tutorial, you will learn…

  • How to recognize 3 of the 5 types of reactions

  • Predict the products of reactions when only given the reactants


What are the 5 types of reactions

What are the 5 types of reactions?


Which 3 will be we learning about

Which 3 will be we learning about??


Synthesis

SYNTHESIS


Synthesis1

Synthesis

  • Two or more reactants combine to form…

ONE PRODUCT!!

AB

A + B 


Synthesis continued

Synthesis Continued

Mg + O2 MgO

Two reactants form one product

2

2

BUT WAIT!!

Don’t forget about everything you have already learned! Is your equation balanced??


Predicting products

Predicting products

Before we keep going… lets learn a few things about predicting products


Predicting products1

Predicting products

  • Here are a few important things to remember when predicting products:

    • The compounds form must be neutral ionic compounds (which means you’ll be paying attention to their charges)

    • You do NOT carry subscripts from the reactants to the products.

    • You always balance your equation LAST


Let s go back to that synthesis example

Let’s go back to that synthesis example

  • Remember the reaction:

Mg + O2

Helpful hint for later…why is oxygen O2 and not just O?

Click to find out why


Why o 2

Why O2??

Oxygen is a diatomic molecule, which means when oxygen is by itself it must be O2. Remember that this DOES NOT mean that oxygen is O2 in compounds, only by itself!

  • What are the other diatomic elements? (hint: remember the heavenly 7!

F2

H2

Br2

N2

I2

Cl2

O2

Go back


Now to predict the products

Now to predict the products…

Mg + O2

  • Remember A + B  AB so Mg + O2 will make a compound with magnesium and oxygen. What does a compound with magnesium and oxygen look like??


A compound with magnesium and oxygen

A compound with magnesium and oxygen…

Magnesium is a metal, oxygen is a nonmetal so we must be forming an IONIC compound.

What’s the charge of Mg?

What’s the charge of O?

O 2-

Mg 2+


So what s the compound

So what’s the compound?

Mg2+

O2-

Pick…

MgO2

MgO

Mg2O2


Chemical reactions tutorial

Nope!

MgO2

+2 + 2(-2)

DOES NOT EQUAL ZERO

Try again!


Chemical reactions tutorial

Nope!

Mg2O2

2(+2) + 2(-2) = 0

But remember ionic compounds need to be in the simplest form

Try again!


Yes very good

Yes! Very good!

  • MgO is a neutral, correct ionic compound so our formula is

Mg + O2 MgO

  • Finally, balance the equation to satisfy the law of conservation of mass…

2Mg + O2 2MgO


So remember

So remember…

  • When predicting products:

    • Make correct ionic compounds

    • THEN balance

      Let’s move on to the rest of the reaction types…


Decomposition

Decomposition


Decomposition1

Decomposition

ONE REACTANT…

forms two or more products

A + B

AB 


Decomposition continued

Decomposition Continued

The electrolysis of water is when water decomposes into hydrogen and oxygen gas as shown below:

2H2O  2H2 + O2


Predicting products and decomposition

Predicting products and decomposition

  • Lets use that same reaction. What if we were not already given the products, how would we predict them?

H2O  ??

Water is made of hydrogen and oxygen, so will my products just be H and O?


Chemical reactions tutorial

No!

  • Remember, H and O are both diatomic elements.

H2O  H2 + O2

But wait….something is still missing….


Balance

Balance!

  • Don’t forget to balance your equation after you make your products! Your final answer should look like this:

2H2O  2H2 + O2


You try one

You try one…

  • What is the correct reaction for the decomposition of sodium chloride, NaCl?

NaCl Na + Cl

2NaCl  Na2 + Cl2

2NaCl  2Na + Cl2


Chemical reactions tutorial

Nope!

NaCl Na + Cl

  • Don’t forget that chlorine is a diatomic element, so it must be Cl2

Try again!


Chemical reactions tutorial

Nope!

2NaCl  Na2 + Cl2

  • Although this reaction is correctly balanced, sodium is NOT a diatomic element

Try again!


Yes very good1

Yes! Very good!

2NaCl  2Na + Cl2

  • This is a correct reaction for the decomposition of sodium chloride.

Ready for the last type of reaction?


Combustion

Combustion


Combustion1

Combustion

  • Combustion is the burning of hydrocarbons.

Hydrocarbon?? What’s that?? Click to find out!

  • When a hydrocarbon reacts with oxygen (O2), the products are ALWAYS…..

Yes,ALWAYS…

Carbon dioxide and water

CO2 + H2O


Hydrocarbons

Hydrocarbons

  • A hydrocarbon is an organic molecule made up of hydrogen and carbon. Remember when we learned about these when we talked about organic chemistry??

C20H42

CH4

C6H10


Combustion cont

Combustion Cont…

  • Since the products of a combustion reaction are always CO2 and H2O, the hardest part about combustion reactions is balancing them

  • CH4 + O2 CO2 + H2O

Balance this equation…


Combustion cont1

Combustion Cont.

  • CH4 + O2 CO2 + 2H2O

  • Be aware… this reaction was pretty easy to balance, some of the combustion reactions get pretty complicated! Like this one…

  • 4C3H9 + 21O2 12CO2 + 18H2O


Ready for your quiz

Ready for your quiz??

Yes!

Not quite, review the types of reactions with me…


Review

Review

  • Synthesis reactions: two or more reactants combine to form ONE product

    A + B  AB

  • Decomposition reactions: ONE reactant breaks down into two or moreproducts

  • AB A + B

  • Combustion reactions: a hydrocarbon reacts with oxygen to produce carbon dioxide and water.

  • Hydrocarbon + O2 CO2 + H2O

Ok, now I’m ready for the quiz!


Quiz question 1 5

Quiz Question 1/5

  • Which of the following is a decomposition reaction?

2Fe + O2 2FeO

Na + AgCl Ag + NaCl

Na2S  2Na + S


Chemical reactions tutorial

Nope!

2Fe + O2 2FeO

  • This is two reactants forming ONE product which is an example of a synthesis reaction

Try again!


Chemical reactions tutorial

Nope!

Na + AgCl Ag + NaCl

  • This reaction does not just form one product. This reaction is an example of a single replacement reaction which we will learn about later.

Try again!


Yes very good2

Yes! Very good!

Na2S  2Na + S

  • This reaction is ONE reactant breaking down into two or more products, which is an example of a decomposition reaction.

Back to the question!

Next question!


Quiz question 2 5

Quiz Question 2/5

  • How can you recognize a combustion reaction?

A combustion reaction is the only reaction always has at least two reactants and two products. One of the reactants is always oxygen gas.

A combustion reaction always has a hydrocarbon reacting with oxygen to produce carbon dioxide and water.

A combustion reaction always has a hydrocarbon reacting with nitrogen, which is a very explosive reaction.


Chemical reactions tutorial

Nope!

A combustion reaction is the only reaction always has at least two reactants and two products. One of the reactants is always oxygen gas.

  • We will learn about other reactions that can have more than one product and more than one reactant. This is NOT the way to identify a combustion reaction.

Try again!


Chemical reactions tutorial

Nope!

A combustion reaction always has a hydrocarbon reacting with nitrogen, which is a very explosive reaction.

  • Although combustion reactions are typically explosive, it is not because they react with nitrogen.

Try again!


Yes very good3

Yes! Very good!

A combustion reaction always has a hydrocarbon reacting with oxygen to produce carbon dioxide and water.

  • This is how we identify a combustion reaction

Back to the question!

Next question!


Quiz question 3 5

Quiz Question 3/5

  • Pick correct bubble that finishes the reaction below.

    K + Cl2 ??

K + Cl2 KCl

2K + Cl2 2KCl

K + Cl2 KCl2


Chemical reactions tutorial

Nope!

K + Cl2 KCl2

  • Remember to not carry subscripts over to your products. K has a +1 charge and Cl has a -1 charge so the product of KCl2 is not neutral and cannot be correct.

Try again!


Almost but not quite

Almost! But not quite…

K + Cl2 KCl

  • Although this product is correct, the equation is not balanced!

Try again!


Yes very good4

Yes! Very good!

2K + Cl2 2KCl

  • The products are correct and the reaction is balanced! Great job!

Back to the question!

Next question!


Quiz question 4 5

Quiz Question 4/5

  • Pick correct rectangle that finishes the reaction below.

    C2H8 + O2  ??

C2H8 + O2 CO2 + H2O

C2H8 + 4O2 2CO2 + 4H2O

C2H8 + O2 C2H8O2


Almost but not quite1

Almost, but not quite…

C2H8 + O2 CO2 + H2O

  • Great job predicting the products, but…. don’t forget to balance!!

Try again!


Chemical reactions tutorial

Nope!

C2H8 + O2 C2H8O2

  • Remember that combustion reactions always have carbon dioxide and water as products

Try again!


Yes very good5

Yes! Very good!

C2H8 + 4O2 2CO2 + 4H2O

  • Products are correct and the equation is correctly balanced. Great job!

Back to the question!

Next question!


Quiz question 5 5

Quiz Question 5/5

  • Pick correct rectangle that finishes the reaction below.

    Al + N2 ??

Al + N2  AlN2

3Al + N2 Al3N2

2Al + N2 2AlN


Chemical reactions tutorial

Nope!

Al + N2  AlN2

  • Remember we do not carry over subscripts. Aluminum has a +3 charge and nitrogen has a -3 charge so a formula of AlN2 is not a neutral compound

Try again!


Chemical reactions tutorial

Nope!

3Al + N2 Al3N2

  • Although this equation is balanced, since aluminum has a +3 charge and nitrogen has a -3 charge, this is not a neutral compound

Try again!


Yes very good6

Yes! Very good!

2Al + N2 2AlN

  • A correct neutral compound for the product and a balanced equation. Great!

Back to the question!

Finish!


Congratulations

Congratulations!

You have finished the chemical reactions tutorial

Go back to the start


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