reactions short

7/29/2019 Reactions Short

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Chemistry Rules

Tuesday, December 18 Pick Up Balancing Act Worksheet

HW

Edline Video on Reactions

Extra Practice Worksheet on

Balancing

Due Tomorrow


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Chemistry Rules

Tuesday, December 18 Do the worksheet!


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HomeWork!!

Follow Link on Edline to Video on

Types of Reactions

There is also a link to Notes. Print andcomplete them.


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Chemistry Rules!!

Thursday, December 15 Get out Completed:

Balancing ActNotes from Video

In your notes use the picket fence to

solve this problem:How many grams are there in 3.4 x

1024 molecules of NH3?


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Objectives:

You will be able to solve molar

problems for moles, grams, andmolecules using the picket fence

method.

You will be able to write FormulaEquations from Sentences.

You will be able to recognize

Synthesis and Decompositiontypes of reactions from their

formula equations.


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12-15-12 Write the Formular Equations for

these reactions:

Solid Magnesium reacts with

atmospheric oxygen to formmagnesium oxide.

Hydrogen peroxide breaks down to

form water and oxygen gas.


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Chemistry Rules!!

Friday, December 16 Get out Completed:

Writing Equations Worksheetwith Answers

In your notes use the picket fence to

solve this problem:

How many atoms of cobalt are

there in 230 grams of CoCl2?


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Write the Formula Equations for:

Concentrated hydrochloric acid

reacts vigorously with zinc in an

exothermic reaction to form zinc

chloride and explosive hydrogengas.


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Chemistry Rules!!

Monday, January 2 Aqueous sodium chloride reacts with

aqueous lead (II) nitrate to yield a lead (II)

chloride precipitate and aqueous sodiumnitrate

Write and balance the formula equation

and determine how many moles would

be in 35 g of lead (II) nitrate.


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Chemistry Rules!!

Tuesday, January 3 Exams are next week!

Reviews must be completed byFriday.

Get out notes on Types of Reactions

some from video, some from ppt


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Write and balance the formulaequation for ..

Ethanol solution reacts with

oxygen gas to form carbon dioxidegas and water vapor.

Aqueous silver nitrate reacts with

sodium chloride solution to form asolution of sodium nitrate and

insoluble silver chloride.


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Chemistry RulesThursday, December 9

Copy and Balance these Formulas: 1. aqueous sodium chloride reacts with

aqueous lead (II) nitrate to yield a lead (II)

chloride precipitate and aqueous sodium nitrate

2. aqueous barium nitrate reacts with sulfuric

acid [H2SO4(aq)] to yield a barium sulfate

precipitate and nitric acid [HNO3(aq)]

3. silver nitrate reacts in solution with

potassium chromate to yield a silver chromate

precipitate and soluble potassium nitrate


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1. aqueous sodium chloride reacts

with aqueous lead (II) nitrate to yielda lead (II) chloride precipitate and

aqueous sodium nitrate

2. aqueous barium nitrate reacts

with sulfuric acid [H2SO4(aq)] to yield

a barium sulfate precipitate and nitric

acid [HNO3(aq)]


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Chemistry RulesThursday, December 20

Copy and Balance these Formulas: Get Out HW

Gonna do more practice today


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Chemistry RulesMonday, January 7

Time is not on your side. Get out Notes. Getout completed Exam Review.

I will NOT be giving you the answers to the

review, again. I have already done that. The choices you make now, the people you

surround yourself with, they all have the

potential to affect your life, even who youare, forever. Sarah Dessen,The Truth About Forever
http://www.goodreads.com/author/show/2987.Sarah_Dessenhttp://www.goodreads.com/work/quotes/1032900http://www.goodreads.com/work/quotes/1032900http://www.goodreads.com/author/show/2987.Sarah_Dessen


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Chemistry RulesMonday, January 7

Review ChatDiscuss Questions about Exam Review

URL will be posted on Edline

Tonight 9-10pm


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ChemicalReactions


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All chemical reactions have two parts

Reactants Products


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In a chemical reaction The way atoms are joined is changed

Atoms arent created of destroyed.

Can be described several ways

In a sentence

Copper reacts with chlorine to form

copper (II) chloride.

In a word equation

Copper + chlorine copper (II) chloride


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Formula Equation

Words are replaced by formulas for

elements and compounds

Cu + Cl CuCl2


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Balancing Chemical Equations


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Balanced Equation Law of Conservation of Mass

Atoms cant be created or

destroyed

All the atoms we start with wemust end up with

A balanced equation has the same

number of each element on bothsides of the equation.


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Rules for balancing

Write the correct formulas for all thereactants and products

Count the number of atoms of each

type appearing on both sides Balance the elements one at a time

by adding coefficients (the numbers

in front) Check to make sure it is balanced.


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Never Change a subscript to balance an

equation.

If you change the formula you are

describing a different reaction.

H2O is a different compound than H2O2

Never put a coefficient in the middle of

a formula

2 NaCl is okay, Na2Cl is not.


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Example

H2 + H2OO2

Use Example on Balancing Act Worksheet!


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Types of Reactions

Predicting the Products


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Types of Reactions There are millions of reactions.

Cant remember them all

Fall into several categories.

We will learn 5 types.

Will be able to predict the products.

For some we will be able to predict

whether they will happen at all.

Will recognize them by the reactants


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#1 Synthesis Reactions Combine - put together

2 elements, or compounds combine

to make one compound.

Ca +O2 CaO SO3 + H2O H2SO4

We can predict the products if theyare two elements.

Mg + N2


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Write and balance Ca + Cl2 Fe + O2 iron (II) oxide Al + O2 Remember that the first step is to

write the formula

Then balance


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#2 Decomposition Reactions decompose = fall apart one reactant falls apart into two or

more elements or compounds.

NaCl Na + Cl2

CaCO3 CaO + CO2

electricity


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#2 Decomposition Reactions Can predict the products if it is a

binary compound

Made up of only two elements

Falls apart into its elements

H2O

HgO

electricity


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#3 Single Replacement

(Displacement) One element replaces another

Reactants must be an element and a

compound.

Products will be a different element

and a different compound.

Na + KCl K + NaCl F2 + LiCl LiF + Cl2


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(Displacement) Metals replace metals (and hydrogen)

K + AlN Zn + HCl Think of water as HOH

Metals replace one of the H, combine

with hydroxide.

Na + HOH

Cs Caesium


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Rb RubidiumK PotassiumNa SodiumLi LithiumSr

Strontium

Ca CalciumMg MagnesiumAl AluminiumC CarbonZn ZincCr ChromiumFe IronCd CadmiumCo CobaltNi NickelSn TinPb LeadH HydrogenBi BismuthCu CopperHg MercuryAg SilverAu GoldPt Platinum


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(Displacement) We can tell whethera reaction will

happen

Some are more active than other More active replaces less active

Higher on the list replaces lower.

If the element by itself is higher, it

happens, in lower it doesnt


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(Displacement) What does it mean that Au And Ag are

on the bottom of the list?

Nonmetals can replace other nonmetals Limited to F2 , Cl2 , Br2 , I2

F2 + HCl Br2 + KCl

#4 D bl R l t


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#4 Double Replacement(Displacement)

Two things replace each other. Reactants must be two ionic

compounds or acids.

Usually in aqueous solution NaOH + FeCl3 The positive ions change place.

NaOH + FeCl3 Fe+3OH- + Na+1Cl-1 NaOH + FeCl3 Fe(OH)3 + NaCl


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How to recognize which type

Look at the reactantsE + E Combination

C Decomposition

E + C Single replacement

C + C Double replacement


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Last Type

Combustion A compound composed of only C H

and maybe O is reacted with oxygen

If the combustion is complete, theproducts will be CO2 and H2O.


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Chapter 7 Summary


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Reactions

Come in 5 types. Can tell what type they are by the

reactants.

Single Replacement happens basedon the activity series using activity

series.

Double Replacement happens if theproduct is a solid, water, or a gas.


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The Process

Determine the type by looking at thereactants.

Put the pieces next to each other

Use charges to write the formulas

Use coefficients to balance the

equation.

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