Embed Size (px)
Citation preview
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
