tuesday 1/27 intro to bonding! - kyrene school district...naming compounds naming compounds (front...
TRANSCRIPT
Tuesday 1/27 Intro to Bonding!
• Please take out your lab book
• Pencil
Warm Up on page 104:
Using the periodic table make a Lewis Dot Diagram for Ar & S….
BrainPop – Chemical Bonds
https://www.brainpop.com/science/matterandchemistry/chemicalbonds/
Chemical BondingMrs. Kaminer 2015
Where are you….Glue your learning scale on page 104 in your INB
1: I can identify the number of electrons in an element. I recognize a Lewis Dot diagram.
2: I can identify different types of bonds. I can recognize a Lewis Dot diagram.
3: I can draw a Lewis Dot diagram for any element or compound correctly.
4: I can draw a Lewis Dot diagram correctly and identify the types of bonding that form a chemical compound.
SW: Understand and demonstrate their knowledge of the composition of an atom,
and the role electrons play in bonding to make a chemical compound.
1/27 – Based on the above scale, I am a ______ because………
Types of Chemical Bonds
• Compound – substance made of the combined atoms of two or more elements
• Chemical Formula – tells what elements a compound contains and the exact number of the atoms of these elements
What do those numbers mean?
• Subscript – represents # of atoms in a molecule of a particular element.
•H₂O subscript SO₄• Supersupscript – represents the oxidation # or how many electrons
have been gained or lost
• SO₄ 2- supersubscript
Coefficient – represents the # of units of each substance
• 2 H₂O
Bonds
• Atoms form compounds to become chemically stable. An atom is chemically stable when the outer energy level is complete or full.
Chemical Bond – force that holds together the atoms in a substance
• Type of Bonds? Based on what you know about bonding, are the following covalent or ionic bonds (use your periodic table to determine the answer)• CaCl2
• NaO• H2
• H2O• SO2
• NaCl• KF• Mg I2
• CO2
• NH3
• How many atoms are in each of the above molecules?
Writing Formulas
Writing Formulas
Writing Formulas
• Hydrate – a compound that has water chemically attached to its ions and written into its chemical formula.
• Covalent compounds can form more than one compound with each other. Scientists use Greek prefixes to indicate # of atoms of each element in binary compounds.
Wednesday 1/28/15
• Please take out your lab book
• Pencil
• Glue stick
• 3 pieces of paper
• Warm Up on page 107• What type of bond are the following compounds and how many of each atom are in
each compound?• NH3
• CH4
• HCl• NaCl
Ratios and Chemical Formulas
Compound
Name
Atoms Atomic
Ratio
Chemical
Formula
Hydrogen
chloride
H Cl
Water H H O
Ammonia N H H H
Methane C H H H H
Propane C C C H H H H
H H H H
Foldable Tabs
Naming Compounds
Naming Compounds (front cover)
Rules for naming compounds (2nd tab)
Rule 1 – Rule for 2nd name (3rd tab)
Rule 2 for 2nd name (4th tab)
Formula Combinations
Nonmetal-Nonmetal compounds
Naming CompoundsCompounds are given names that come from the names of their
elements.
Rules for Naming Compounds
• All compounds have 2 names
• The first name of the compound comes from the first element in the formula
• A subscript after the first element doesn’t affect the name
Rules for the second name
• Rule 1• If the compound only has 2 elements and is a metal-nonmetal compound, the
second name is the name of the second element with the ending changed to “ide”
• Examples:• Cl Chlorine becomes Chloride
• S Sulfur becomes Sulfide
• I Iodine becomes Iodide
• O Oxygen becomes Oxide
Rules for the second name
• Rule 2
• If the compound has more than 2 elements, the second name will come from the combination of elements at the end of the formula
Formula combinations
• NO3 nitrate NaNO3 = Sodium Nitrate
• OH hydroxide
• PO4 phosphate NaPO4 = Sodium Phosphate
• CO3 carbonate CaCO3 = Calcium Carbonate
• SO4 sulfate
Nonmetal-Nonmetal Compounds• start with element to the left side on the periodic
table
• add -ide to the second element
• use Greek prefixes for number of atoms: mono (1), di (2), tri (3), tetra (4), penta (5), hexa (6), hepta(7), octa (8), nona (9), deca (10)
• Example: • CO carbon monoxide
• CO2 carbon dioxide
• N2O5 dinitrogen pentoxide