4.05 Chemical Reactions Virtual Laboratory. The Plan Review the different types of Chemical...

4.05 Chemical Reactions

Virtual Laboratory

The Plan

• Review the different types of Chemical Reactions

• Complete the Virtual Lab via screen share/slides with teacher

• Make predictions of reaction types• Discuss the analysis questions• Complete the lab on your own

Before we Begin

• Please open your virtual lab in the course

Create/Download the Lab Form

• Copy and Paste the lab form into a document or download the pre-made form from the Chemistry Resource Center https://sites.google.com/site/chemistryflvs/

Let’s Review!

Please Open the Virtual Lab

Follow the Steps

Take note of the reactants

Write the Formula for the Reactants

Iron (III) and Copper (II) Sulfate

• First, identify the symbols and oxidation numbers

Iron (III) is Fe3+

Copper (II) is Cu2+

Sulfate is SO42-

• Next, write the formulas. Switch the oxidation numbers to become the opposite element/compounds subscript. Ignore the charges

Fe + CuSO4

Prediction

Fe + CuSO4

What type of reaction might this be?

Why?

Play the Video, Make Observations

Click Here

Next Reaction

Write the Formula for the Reactants

Lead (II) Nitrate and Potassium Iodide

• First, identify the symbols and oxidation numbers

Lead (II) is Pb2+

Nitrate is NO31-

Potassium is K1+

Iodide is I1-

• Next, write the formulas. Switch the oxidation numbers to become the opposite element/compounds subscript. Ignore the charges

Pb(NO3)2 + KI

Prediction

What type of reaction might this be?

Why?

Pb(NO3)2 + KI

Next

Next Reaction

Write the Formula for the Reactants

Magnesium Metal Ribbon and Hydrochloric Acid

• First, identify the symbols and oxidation numbers

Magnesium is Mg2+

Hydrochloric Acid is H1+ and Cl1- or HCl

• Can you write the reactant side of this equation?

Prediction

Mg + HCl

What type of reaction might this be?

Why?

Next

Next Reaction

Write the Formula for the Reactants

Electrolysis of Water

• First, identify the symbols and oxidation numbers

Water is H2O

• This lab is different right? You only have ONE reactant and they show you the products in the video. What is our equation?

Prediction

H2O

What type of reaction might this be?

Why?

LASTLY

Next Reaction

Write the Formula for the Reactants

Burning Magnesium

• First, identify the symbols and oxidation numbers

Magnesium is Mg2+

• This lab is different too! You only have ONE reactant. This forms a new substance at the end. What allowed the Mg to burn? What is our equation?

Prediction

Mg + O2

What type of reaction might this be?

Why?

Could it be something else?

Writing our balanced equations

* Fe + CuSO4

Iron (III) is Fe3+

Copper (II) is Cu2+

Sulfate is SO42-

Iron and Copper will switch places

Cu + Fe2(SO4)3

Balance this!

Cu + Fe2(SO4)3Fe + CuSO4

Is this balanced? What do we need to do to balance it?

What type of reaction is this?

Writing our balanced equations

*

Lead and Potassium will switch places

PbI2 + KNO3

Pb(NO3)2 + KI Lead (II) is Pb2+

Nitrate is NO31-

Potassium is K1+

Iodide is I1-

Balance this!

Is this balanced? What do we need to do to balance it?

What type of reaction is this?

Pb(NO3)2 + KI PbI2 + KNO3

Writing our balanced equations

*

Magnesium and Hydrogen will switch places**Remember that Hydrogen is a diatomic molecule**

H2 + MgCl2

Magnesium is Mg2+

Hydrochloric Acid is H1+ and Cl1- or HCl

Mg + HCl

Balance this!

Is this balanced? What do we need to do to balance it?

What type of reaction is this?

Mg + HCl H2 + MgCl2

Writing our balanced equations

*

H2 + O2

H2O **The video showed you the products**

Hydrogen and oxygen are both diatomic molecules

Balance this!

Is this balanced? What do we need to do to balance it?

What type of reaction is this?

H2 + O2H2O

Writing our Balanced Equations

Mg + O2

Magnesium is Mg2+

Oxygen is O2-

Not all combustion reactions involve organic compounds made of carbon and hydrogen, which means that the products are not always carbon dioxide and water. Other substances, both compounds and elements, can burn in oxygen. These reactions can often be categorized as synthesis reactions, but they are considered combustion reactions as well because a substance is reacting with oxygen and releasing energy.

Balance this!

Is this balanced? What do we need to do to balance it?

What type of reaction is this?

MgOMg + O2

Is there another choice?

Analysis

• #1~ We’ve written the balanced equations

• #2~ What does the law of conservation of mass state? Is this a closed container? Where did the gas go?

• #3~ Which reaction that we investigated can be more than one type?

Congrats!!

Great job! We did it!!

Questions?