Homework Nov 11 - 15
Mon.
Finish S. Guide inc. ISTEP
Tues.
Review
Weds.
Ch 4 Chem. Rxn Test
Thurs.
Complete 5.1
Friday
2 Q Current Event
C. Lab Work Day
Name
3
4.5 and
Study
Guide
My
pts
Pts
Poss.
Tot
“My
Pts”
20
TPP Grade
70
Update QPSChemical Bond and Reaction Test Tomorrow
Today’s Goal:
Summarize how the law of conservation of matter
applies to chemical bonds and equations.
Ch 4 Bonds and Reactions Test
This is what will be covered on the Test
•Why do atoms Combine?
•Compare Covalent and Ionic Bonds.
•Illustrate what the valence electrons do in both bond types.
•Explain the Law of the Conservation of Matter.
•Balance a chemical equation.
•Explain the difference between a chemical and physical
change.
1. Write the correct balanced
formula equation for the
following reaction.
Solid sodium combines with
chlorine gas to produce solid
sodium chloride.
2. Illustrate the following
bonds with Lewis
Structures and a bond
structure.
Covalent: H + O
2Na(s) + Cl2(g)  2NaCl(s)
3. Why do elements combine?
To form compounds and
find stability with a
complete shell of valence
electrons.
4. Balance the following
chemical reaction.
•
Sr(OH)2 + FeCl3  SrCl2 + Fe(OH)3
3Sr(OH)2 + 2FeCl3 3SrCl2 + 2Fe(OH)3
5. Create a Venn Diagram
comparing Covalent and Ionic
Bonds
6. Why is it important to
balance chemical
equations
•
Why should the # of atoms that react
yield the same # of products?
Supports the law of conservation of matter
7. Describe (using
Physical
examples) the difference
between a chemical and Chemical
physical change.
8. Illustrate the following
bonds with Lewis
Structures
Ionic: Na + Cl
Bonds and Reactions Test
•Why do atoms Combine?
•Compare Covalent and Ionic Bonds.
•Illustrate what the valence electrons do in both bond types.
•Explain the Law of the Conservation of Matter.
•Balance a chemical equation.
•Explain the difference between a chemical and physical change.
Chemical Bonds
and Reaction
Review
Questions
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Chapter Review
Question 1
Ancient thinkers who invented a basic form of
chemistry, but mixed it with magical beliefs
and superstitions were known as _______.
A. alchemists
B. botanists
C. scientists
D. zoologists
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IN: 8.1.1
Chapter Review
Question 1
Ancient thinkers who invented a basic form of
chemistry, but mixed it with magical beliefs
and superstitions were known as _______.
A. alchemists
B. botanists
C. scientists
D. zoologists
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summary click Escape or
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IN: 8.1.1
Chapter Review
Answer
The answer is A. Modern chemists owe the
origins of their science to the alchemists.
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IN: 8.1.1
Chapter Review
Question 2
NH3 is an example of a _______.
A. bond
B. compound
C. molecule
D. polar molecule
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IN: 8.3.8
Chapter Review
Question 2
NH3 is an example of a _______.
A. bond
B. compound
C. molecule
D. polar molecule
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IN: 8.3.8
Chapter Review
Answer
The answer is B. In this case, the compound
being described is ammonia.
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IN: 8.3.8
Chapter Review
Question
What is the term for molecules that have an
even number of charges?
Answer
Nonpolar molecules have an even number of
charges. The only totally nonpolar molecules
are molecules formed by the bonding of atoms
of the same element.
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IN: 8.3.8
Chapter Review
Question
When two pairs of electrons are both involved
in a covalent bond, what is formed?
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IN: 8.3.8
Chapter Review
When two pairs of electrons are both involved
in a covalent bond, what is formed?
Answer
A double bond is formed. When three pairs are
involved, it is known as a triple bond.
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IN: 8.3.8
Chapter Review
Question
What type of bond is formed when electrons
are shared unevenly?
A. covalent bond
B. ionic bond
C. metallic bond
D. polar bond
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IN: 8.3.8
Chapter Review
Question
What type of bond is formed when electrons
are shared unevenly?
A. covalent bond
B. ionic bond
C. metallic bond
D. polar bond
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IN: 8.3.8
Chapter Review
Answer
The answer is D. The bonds between the
oxygen atom and hydrogen atoms in the water
molecule are an example of a polar bond.
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IN: 8.3.8
Standardized Test Practice
Question
A series of chemical symbols and numbers that
shows which elements are present in a
compound, as well as how many atoms of each
element are present, is known as a _______.
A. chemical bond
B. chemical compound
C. chemical formula
D. chemical set
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IN: 8.3.8
Standardized Test Practice
Question
A series of chemical symbols and numbers that
shows which elements are present in a
compound, as well as how many atoms of each
element are present, is known as a _______.
A. chemical bond
B. chemical compound
C. chemical formula
D. chemical set
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IN: 8.3.8
Standardized Test Practice
Answer
The answer is C. Chemical formulas are
mathematical models that help us understand
actual properties of element and compounds.
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IN: 8.3.8
Standardized Test Practice
Question
What does the formula NH3 tell you?
A.There are three nitrogen and three hydrogen
atoms in this compound.
B. There are three nitrogen atoms and one
hydrogen atoms in this compound.
C. There are three hydrogen atoms and one
nitrogen atoms in this compound.
D. There is one nitrogen atom and one hydrogen
atom in this compound.
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IN: 8.3.11
Standardized Test Practice
Question
What does the formula NH3 tell you?
A.There are three nitrogen and three hydrogen
atoms in this compound.
B. There are three nitrogen atoms and one
hydrogen atoms in this compound.
C. There are three hydrogen atoms and one
nitrogen atoms in this compound.
D. There is one nitrogen atom and one hydrogen
atom in this compound.
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IN: 8.3.11
Standardized Test Practice
Answer
The answer is C. The formula tells you that the
ratio is one nitrogen atom to three hydrogen
atoms.
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IN: 8.3.11
Standardized Test Practice
Question
How many electrons are there in this atom’s
outermost energy level?
A. 1
B. 5
C. 7
D. 14
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IN: 8.3.11
Standardized Test Practice
Question
How many electrons are there in this atom’s
outermost energy level?
A. 1
B. 5
C. 7
D. 14
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IN: 8.3.11
Standardized Test Practice
Answer
The answer is C. The dots give the number of
electrons in the outer energy level, not
necessarily the total number of electrons.
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IN: 8.3.11
Chapter Review
Question
Many kinds of food need to be refrigerated in
order to keep them from spoiling. Knowing
what you now know about chemistry, can you
explain why this is so?
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IN: 8.3.11
Chapter Review
Answer
A decrease in temperature decreases reaction
rates. Since spoilage is a chemical reaction,
refrigeration of perishable food will slow down
its tendency to spoil.
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IN: 8.3.11
Chapter Review
Question
According to the law of the conservation of
mass, the mass of the _______ must be the
same as the mass of the _______.
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IN: 8.3.12
Chapter Review
Answer
The mass of the products must be the same as
the mass of the reactants.
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IN: 8.3.12
Standardized Test Practice
Question
Even if it isn’t written into a chemical equation,
_______ is always part of any chemical reaction.
A. energy
B. sound
C. tonality
D. vibration
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IN: 8.3.15
Standardized Test Practice
Question
Even if it isn’t written into a chemical equation,
_______ is always part of any chemical reaction.
A. energy
B. sound
C. tonality
D. vibration
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summary click Escape or
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IN: 8.3.15
Standardized Test Practice
Answer
The answer is A. Energy may be needed to
start the reaction or it may be given off as a
result of the reaction, but it is always involved.
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IN: 8.3.15
Review and Reinforce
• Use the time remaining to:
1.Complete Ch. 4 Study Guide
2.Review using websites on Ch.
4 Homepage.
Chemical Reactions Test
Learning Goal
• Demonstrate your knowledge of chemical
bonds and reactions.
After the test, complete section 5.1 beginning on
page 184