homework nov 11 - 15 mon. finish s. guide inc. istep tues. review weds. ch 4 chem. rxn test thurs....
TRANSCRIPT
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 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.
To return to the chapter summary click Escape or close this document.
Chemical Bonds and Reaction
ReviewQuestions
To return to the chapter summary click Escape or close this document.
Question 1
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Question 1
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter Review
The answer is A. Modern chemists owe the origins of their science to the alchemists.
IN: 8.1.1
To return to the chapter summary click Escape or close this document.
Question 2
Chapter ReviewChapter Review
NH3 is an example of a _______.
A. bondB. compoundC. moleculeD. polar molecule
IN: 8.3.8
To return to the chapter summary click Escape or close this document.
Question 2
Chapter ReviewChapter Review
NH3 is an example of a _______.
A. bondB. compoundC. moleculeD. polar molecule
IN: 8.3.8
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter Review
The answer is B. In this case, the compound being described is ammonia.
IN: 8.3.8
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter Review
When two pairs of electrons are both involved in a covalent bond, what is formed?
IN: 8.3.8
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter 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?
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized Test Practice
Answer
The answer is C. Chemical formulas are mathematical models that help us understand actual properties of element and compounds.
IN: 8.3.8
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized Test Practice
Answer
The answer is C. The formula tells you that the ratio is one nitrogen atom to three hydrogen atoms.
IN: 8.3.11
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized Test Practice
Question
How many electrons are there in this atom’s outermost energy level?
A. 1B. 5C. 7D. 14
IN: 8.3.11
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized Test Practice
Question
How many electrons are there in this atom’s outermost energy level?
A. 1B. 5C. 7D. 14
IN: 8.3.11
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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.
IN: 8.3.11
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Question
Chapter ReviewChapter 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
To return to the chapter summary click Escape or close this document.
Answer
Chapter ReviewChapter Review
The mass of the products must be the same as the mass of the reactants.
IN: 8.3.12
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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
To return to the chapter summary click Escape or close this document.
Standardized Test PracticeStandardized 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.
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