Homework Nov 11 - 15Mon. 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 My pts

Pts Poss.

Tot “My Pts”

TPP Grade

3 4.5 and Study Guide

20 70

Today’s Goal: Summarize how the law of conservation of

matter applies to chemical bonds and equations.

Update QPS- Chemical Bond and Reaction Test Tomorrow

Ch 4 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.

This is what will be covered on the Test

1. Write the correct balanced formula equation for the following reaction.

Solid sodium combines with chlorine gas to produce solid sodium chloride.

2Na(s) + Cl2(g) 2NaCl(s)

2. Illustrate the following bonds with Lewis Structures and a bond structure.

Covalent: H + O

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 examples) the difference between a chemical and physical change.

Physical

Chemical

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.

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Chemical Bonds and Reaction

ReviewQuestions

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Question 1

Chapter Review

Ancient thinkers who invented a basic form of chemistry, but mixed it with magical beliefs and superstitions were known as _______.

A. alchemistsB. botanistsC. scientistsD. zoologists

IN: 8.1.1

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Question 1

Chapter Review

Ancient thinkers who invented a basic form of chemistry, but mixed it with magical beliefs and superstitions were known as _______.

A. alchemistsB. botanistsC. scientistsD. zoologists

IN: 8.1.1

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Answer

Chapter Review

The answer is A. Modern chemists owe the origins of their science to the alchemists.

IN: 8.1.1

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Question 2

Chapter Review

NH3 is an example of a _______.

A. bondB. compoundC. moleculeD. polar molecule

IN: 8.3.8

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Question 2

Chapter Review

NH3 is an example of a _______.

A. bondB. compoundC. moleculeD. polar molecule

IN: 8.3.8

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Answer

Chapter Review

The answer is B. In this case, the compound being described is ammonia.

IN: 8.3.8

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Question

Chapter Review

What is the term for molecules that have an even number of charges?

AnswerNonpolar molecules have an even number of charges. The only totally nonpolar molecules are molecules formed by the bonding of atoms of the same element.

IN: 8.3.8

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Question

Chapter Review

When two pairs of electrons are both involved in a covalent bond, what is formed?

IN: 8.3.8

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Answer

Chapter Review

A double bond is formed. When three pairs are involved, it is known as a triple bond.

IN: 8.3.8

When two pairs of electrons are both involved in a covalent bond, what is formed?

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Question

Chapter Review

What type of bond is formed when electrons are shared unevenly?

A. covalent bondB. ionic bondC. metallic bondD. polar bond

IN: 8.3.8

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Question

Chapter Review

What type of bond is formed when electrons are shared unevenly?

A. covalent bondB. ionic bondC. metallic bondD. polar bond

IN: 8.3.8

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Answer

Chapter Review

The answer is D. The bonds between the oxygen atom and hydrogen atoms in the water molecule are an example of a polar bond.

IN: 8.3.8

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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 bondB. chemical compoundC. chemical formulaD. chemical set

IN: 8.3.8

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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 bondB. chemical compoundC. chemical formulaD. chemical set

IN: 8.3.8

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Standardized Test Practice

AnswerThe answer is C. Chemical formulas are mathematical models that help us understand actual properties of element and compounds.

IN: 8.3.8

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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.

IN: 8.3.11

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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.

IN: 8.3.11

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Standardized Test Practice

AnswerThe answer is C. The formula tells you that the ratio is one nitrogen atom to three hydrogen atoms.

IN: 8.3.11

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Standardized Test Practice

Question How many electrons are there in this atom’s outermost energy level?

A. 1B. 5C. 7D. 14

IN: 8.3.11

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Standardized Test Practice

Question How many electrons are there in this atom’s outermost energy level?

A. 1B. 5C. 7D. 14

IN: 8.3.11

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Standardized Test Practice

AnswerThe answer is C. The dots give the number of electrons in the outer energy level, not necessarily the total number of electrons.

IN: 8.3.11

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Question

Chapter Review

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?

IN: 8.3.11

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Answer

Chapter Review

A decrease in temperature decreases reaction rates. Since spoilage is a chemical reaction, refrigeration of perishable food will slow down its tendency to spoil.

IN: 8.3.11

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Question

Chapter Review

According to the law of the conservation of mass, the mass of the _______ must be the same as the mass of the _______.

IN: 8.3.12

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Answer

Chapter Review

The mass of the products must be the same as the mass of the reactants.

IN: 8.3.12

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Standardized Test Practice

Question Even if it isn’t written into a chemical equation, _______ is always part of any chemical reaction.

A. energyB. soundC. tonalityD. vibration

IN: 8.3.15

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Standardized Test Practice

Question Even if it isn’t written into a chemical equation, _______ is always part of any chemical reaction.

A. energyB. soundC. tonalityD. vibration

IN: 8.3.15

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Standardized Test Practice

AnswerThe 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.

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 TestLearning Goal• Demonstrate your knowledge of chemical

bonds and reactions.

After the test, complete section 5.1 beginning on page 184