Prayer/Next PrayerCheck Homework

Attendance

CHAPTER 5 REVIEW NAMING POLYATOMIC IONS & ACIDS

Ms. Doshi

Naming Compounds that Contain Polyatomic Ions

polyatomic ions -charged entities made of many atomsExample: NH4NO3 contains these polyatomic ions: NH4

+ and NO3-

oxyanions-polyatomic anions that contain an atom of a given element and different number of oxygen atoms.

Memorize these!Need to give memory aid to students.

Naming Compounds with Polyatomic Ions1. Similar to binary ionic compoundsmust memorize common polyatomic ionsand learn the composition and charge of each ion in Table 5.4Example: NH4C2H3O2 is ammonium acetate.

2. When you see a metal that can form one or more cation, use a Roman Numeral. Similar to Type II binary ionic compounds.Example: FeSO4 is iron(II) sulfate

Now, you try!

Name the following compounds

a) Na2CO3b) FeBr3c) CsClO4d) PCl3e) CuSO4

a) NaHCO3b) BaSO4c) CsClO4d) BrF5e) NaBrf) KOClg) Zn3(PO4)2

Naming Acids

acid:-a molecule with one or more H+ ions attached to an anion

Examples: H2SO4, H3PO4

Rules (in your textbook)

Use Rule 2

Acid Anion Name

HClO4

HClO3

HClO2

HClO

perchlorate

chlorate

chlorite

hypochlorite

perchloric acid

chloric acid

chlorous acid

hypochlorous acid

Names of acids that do not contain oxygen-MEMORIZE

Names of some acids that contain Oxygen-MEMORIZE

Naming Acids: Practice

Name each of the following acids:

Name the Acid Name the Acid

HOCl HBrO4

H2SO3 H2S

HBrO3 H2Se

HOI H3PO3

Write the Formulas from Names

Chapter 5 Review Questions

4, 8, 10, 12, 14, 24, 26, 28, 30, 34, 38, 42, 44, 46, 48

Answers are in your textbook!

CHAPTER 6CHEMICAL REACTIONS: AN INTRODUCTION

Ms. Doshi

Evidence for a Chemical Reaction

How do we know that a chemical reaction has occurred?1.The color changes. (We can see this)2.A solid forms. (We can see this.)3.Bubbles form. (We can see this.)4.Heat and/or a flame is produced, or heat is absorbed. (We can’t see heat but we can feel it).

Evidence of a Chemical ReactionPicture Explanation

An electric current passes through water, hydrogen and oxygen gas are formed. http://www.youtube.com/watch?v=cJmuMBfVtLo

Cold pack. You break an ampule, the reaction begins causing that pack to absorb heat quickly.

Warm pack. Open the package. Oxygen reacts with chemicals in the bag, heat is produced for many hours.

HCl (colorless)+ cobalt(II)nitrate (red) produces a blue solutionhttp://www.youtube.com/watch?v=ryWsghHblWQ

sodium dichromate + lead nitrate forms a solid. http://www.youtube.com/watch?v=Jt0eGtHHV04

calcium (metal) + water forms hydrogen gas (bubbles)http://www.youtube.com/watch?v=UMqPKQKamhk

methane gas + oxygen forms a flame in a Bunsen Burner http://www.youtube.com/watch?v=cmXbGbj6ipM

A Chemical Reactionchemical reaction-represented by a chemical equationreactants-chemicals present before the reaction products-chemicals formed by the reactionreactants productsExample:

arrow = direction of change, read as “yields” or “produces”

Very IMPORTANT!!!

In a chemical reaction, atoms are neither created or destroyed. The number of each type of atom on the reactant side = the number of each type of atom on the product side.This is called balancing the chemical equation

Unbalanced Equation and Balanced Equation

Unbalanced Equation

Balanced Equation

Physical StatesSymbol State(s) solid(l) liquid(g) gas(aq) dissolved in water

(aqueous solution)

Example:Unbalanced Equation with Physical States

Write Unbalanced Equations

Read and Understand Example 6.1 Do Exercise 6.1.

A Chemical Equation

A chemical equation gives us this information:1.the reactants and products2.the numbers of each3.the physical states

We want our equations to be balanced and show the physical states of all of our reactants and products.

How to Write and Balance Chemical EquationsLet’s do together: Let’s balance the equation for liquid ethanol. (p154)1. Read the description of the chemical reaction. What are the reactants? The products, and their states? Write the formulas. 2. Write the unbalanced equation. 3. Balance the equation. Start with the most complicated molecule (the one with the most elements). 4. Check to see that the coefficients used give the same number of each type of atom on both sides of the arrow.

Balancing Chemical Equations I

Let’s do together:

Balancing Chemical Equations II

Let’s do together:

Balancing Chemical Equations III

Let’s do together:

Exercise 6.3

Now, it’s your turn:

Problems to do: RIGHT NOW!

Chapter 6 Review

6.28, 10, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32

6.338, 40, and 42

WE ARE NOT FINISHED!

Review Exercise to do for Chapters 4 and 5!19, 21, 22, 23, 24, 26, 28, 30, and 31

Any Questions?Any Answers?

Any Comments?