Hot minute!!!

The Hot Minute ANSWERS!!!!!!

1. Iron (II) sulfite FeSO3

2. Mg(CN)2 Magnesium cyanide

3. Calcium phosphate Ca3(PO4)2

4. H3P Hydrophosphoric acid

5. Dinitrogen pentoxide N2O5

6. FeS Iron (II) sulfide7. Lead (IV) nitride Pb3N4

8. C4H8 Tetracarbon octahydride

9. Acetic acid HC2H3O2

10. H3PO4 Phosphoric acid

7ABC- STAAR Warm 

1. Magnesium chloride can be used in various ways including gardening, medical use, and an anti-icer.

Draw the electron dot structure to show how magnesium and chlorine combine to make magnesium

chloride AND give the correct formula for the compound.

  2. Sulfur dioxide is gas produced by burning certain fuels and is one of the causes of acid rain. Draw the

electron dot structure for sulfur dioxide AND give the correct formula.

#1 Subquestions0 Is the compound ionic or covalent? 0 Are the electrons transferred or shared?

0 What is the symbol for magnesium?

0 How many valence electrons does magnesium have? How do you know?

0 What is the symbol for chlorine?

0 How many valence electrons does chlorine have? How do you know?

0 How many magnesium are needed?

0 How many chlorine are needed?

Ionic

Transferred

Mg

2, it’s in group 2Cl

7, it’s in group 7

1

2

Warm up answer #1

Mg Cl

Cl

[Mg]+2 2[Cl]-1

Formula: MgCl2

#2 Subquestions0 Is the compound ionic or covalent?

0 Are the electrons transferred or shared?

0 What is the symbol for sulfur?

0 How many valence electrons does sulfur have? How do you know?

0 What is the symbol for oxygen?

0 How many valence electrons does oxygen have? How do you know?

Covalent

Shared

S

6, it’s in group 6

O

6, it’s in group 6

Warm Up Answer #2

S OO

Formula: SO2

Good Afternoon!

• Make sure you have a white board, marker and eraser (either from side counter or under your desk)

• No calculators needed today

• Remember – Tuesday, Wednesday, Thursday are TAKS. Classes for sophomores and seniors start at 1:35 – get here a bit early!

7ABC-mini lesson-bonding and chemical formulas-Lewis structures

-naming

Ionic Bonds

0 What is an ionic bond?

Bond between a metal and a nonmetal

Ionic Bonds

0Are electrons shared or transferred in an ionic bond?

Transferred

Ionic Bonds

0How are they transferred? From what to what?

From the cation to the anion

Ionic Bonds

0What is the result of transferred electrons?

A compound

Ionic Bonds

0Which element goes 1st when writing a chemical formula?

Cation

Ionic Bonds

0How do you determine the number of valence electrons?

Use the ‘A’ Group NumbersEx: Group 2A – 2 valence electrons

Group 7A- 7 valence electrons

Ionic Bonds0How do you determine the charge?

Use the ‘A’ Group numbersGroup 1A: Charge +1 Group 5A: Charge -3Group 2A: Charge +2 Group 6A: Charge -2Group 3A: Charge +3 Group 7A: Charge -1

Group 4A: Charge +/- 4

Ionic Bond

K F

Final formula: KF

+ _

Lewis Structure: [K]+ [:F:]-

:

:

Ionic bonds

Al ClClClClClClClCl

ClClCl

Final Formula: AlCl3

3+

-

-

-Lewis Structure: [Al]3+ 3[:Cl:]-

:

:

Or [Al]3+ [:Cl:]-

Ionic bonds-with polyatomic

Final formula: Mg3(PO4)2

Lewis Structure: 3[Mg]2+ 2[PO4]3-

[Mg]2+ [PO4]3-

**Over all charger must be 0

Over all charge: 3(+2) + 2(-3) = 0

You Try!0Show the transfer of electrons, draw the

Lewis structure, and give the formula for the following:0Li and P

White boards

Answer!Li P

Li

LiLewis Structure: 3[Li]+ [:P:]-3

:

:

Final Formula: Li3P

You Try!0Draw the Lewis structure, and give

the formula for the following:0Al and SO4

White boards

Answer!

Lewis Structure: 2[Al]+3 3[SO4]-2

[Al]+3 [SO4]-2

Final formula: Al2(SO4)3

Student Manipulative0Making compounds with cards:0Ammonium and hydroxide0Ammonium and Fluoride0Copper and sulfate0Calcium and Carbonate0Lead Iodide0Magnesium Chloride

Naming Ionic Compounds:Main Group Metal & Non-metal0Metal (as is) + non-metal + –ide0Ex: KF → Potassium Fluoride

Checking for understanding!

0Write the name for Na3N

0Write the formula for Lithium Sulfide

White boards

Sodium Nitride

Li2S

0Metal (as is) + Polyatomic ion0Ex: Mg(OH)2 → Magnesium Hydroxide

Naming Ionic Compounds:Main Group Metal & Polyatomic ion

Checking for understanding!

0Write the name for Ca3(PO4)2

0Write the formula for Barium Sulfate

White boards

Calcium Phosphate

BaSO4

0Non-metals:0Metal + Roman numeral (charge) + non-metal + -ide0Ex: CuO → Copper (II) Oxide

0Poly atomic ions:0Metal + Roman Numeral (charge) + polyatomic ion

0Ex: Fe2(SO4)3 → Iron (III) Sulfate

Naming Ionic Compounds:Transition Metals

Checking for understanding!

0Write the name for PbI2

0Write the formula for cadmium (II) carbonate

White boards

Lead (II) Iodide

CdCO3

Compound Tournament

Or….Dice Activity!!!

Naming Acids-first element begins with hydrogen

0Anion does not contain oxygen:0Hydro – + root of anion + ic + acid0Ex: H2S – hydrosulfuric acid

Checking for understanding!

0Write the name for H3N

0Write the formula for Hydroiodic acid

White boards

Hydronitric acid

HI

Naming Acids-first element begins with hydrogen

0Anion contains oxygen:0Ends in –ite: Anion + -ous + acid0Ex: HClO2 → Chlorous acid

0Ends in –ate: Anion + -ic + acid0Ex: HClO3 → Chloric acid

Checking for understanding!

0Write the name for H2Cr2O7

0Write the name for HClO

0Write the formula for Sulfurous Acid

White boards

Dichromic acid

Hypochlorous acid

H2SO3

Covalent

0What is a covalent bond?

Bond between 2 non-metals

Covalent

0Are electrons shared or transferred in a covalent bond? Shared

Covalent Bond

N I I

Final formula: NI3

I N I I I

Covalent Bonds

SiO O

O Si O

Final formula: SiO2

Covalent Bonds

C CH H

H C C H

Final formula: C2H2

You Try!0Show the sharing of electrons for the

given formula:0HCN

White boards

Answer!

H C N

H C N

Naming Covalent Compounds

0Use prefixes!! Change ending to -ide0Exceptions: Do not use the prefix mono- on

the first element in the compound.0Ex: CH4 → Carbon Tetrahydride

What are the prefixes??

0Mono-0Deca-0Hexa- 0Tetra-0Tri-

0Octa-0Di-0Penta- 0Hepta-0Nona-

1

10

6

4

3

8

2

5

7

9

White boards

Checking for understanding!

0Write the name for N2O3

0Write the name for PO5

0Write the formula for Sulfur Hexachloride

White boards

Dinitrogen Trioxide

Phosphorous Pentoxide

SCl6