GRADE 9 SCIENCE Chemical · PDF fileGRADE 9 SCIENCE Chemical Changes. ... demonstrate physical and chemical changes and relate their application to everyday ... Print Resources Notes

Grade Nine Science

Page 229Program Description for Intermediate Science

GRADE 9 SCIENCE

Chemical Changes

Grade Nine Science

Page 230 Program Description for Intermediate Science

Grade Nine Science


Chemical Changes

Unit Overview

The main emphasis of this unit is the nature of science. The unit provides an introduction toelements and compounds and how differences between them can be explained using the AtomicTheory. The students are introduced to writing symbols and chemical formulae for commonelements and compounds with the use of the periodic table. This unit enables the students todemonstrate physical and chemical changes and relate their application to everyday situations.

Also, the students investigate factors which affect the rate of a chemical reaction so that theresults can be applied in the student's everyday experience.

Grade Nine Science


Concept Type/LevelIntended Learner Outcome

After completion of this unit, the student will beable to:

1. Pure substances canbe classified aselements orcompounds.

2. The atomic theory canbe used to explaindifferences betweenelements andcompounds.

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A. Define element as a pure substance thatcannot be decomposed.

B. Define compound as a pure substance thatconsists of two or more elements combinedin a fixed proportion.

C. Identify examples of elements andcompounds.

A. Use the atomic theory to distinguish betweenatoms and molecules.

B. Distinguish between elements andcompounds:- type of atoms-ability to decompose-abundance in nature

A. Identify the chemical symbols for a numberof common elements.

3. Elements are represented by aninternationally agreed uponsystem of symbols. Eachsymbol is either a capital letteror a capital letter followed by asmall letter.

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Technology LinksInstructional Strategies/

Notes to TeacherPrint Resources

1. S.D., pp. 9-11S.P.T., pp. 106-109

2. S.D., p. 12S.P.T., N/A

3. S.D., p. 14S.P.T., p. 108

Grade Nine Science




6. The atomic number of anelement represents the numberof protons in one atom of theelement.

A. Identify and interpret chemical formulae forseveral common compounds.

C/U4. A compound is represented bya combination of symbolsknown as its chemicalformula. The chemicalformula indicates whichelements are in the compoundsand in what proportions theyare present.

5. An atom is the smallestparticle into which an elementmay be subdivided and retainthe properties of the element.

A. Describe the relationship between the threesubatomic particles: protons, neutrons, andelectrons.

B. Illustrate models of various atoms.

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A. Determine the number of protons andelectrons in an atom when given itsatomic number.

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4. S.D., p. 15S.P.T., N/A

5. S.D., pp. 16-18S.P.T., N/A

6. S.D., pp. 346-347S.P.T., N/A

Grade Nine Science




7. The periodic table is a systemof organizing elements basedon their atomic numbers.

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A. Recognize that the columns in the periodictable contain elements with similarproperties.

B. Use the periodic table to identify families ofelements.

C. Use the periodic table to locate the generalposition of metals.

8. Pure substances, whencombined, may undergo aphysical or chemical change.

A. Distinguish between a physical andchemical change.

B. Describe the characteristics of a chemicalchange.

C. Provide examples of physical or chemicalchange.

D. Explain the importance of physical andchemical changes in our everyday life.

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9. A chemical change resultsfrom a chemical reactionwhich involves reactants andproducts.

A. Distinguish between the reactants andproducts in a simple chemical reaction.

B. Use word equations to describe simplechemical reactions.

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7. S.D., pp. 22-26S.P.T., pp. 103-105

9. S.D., p. 31S.P.T., pp. 120-121

8. S.D., p. 27S.P.T., pp. 103-105

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10. In a chemical reaction themass of the reactants willequal the mass of the products.

13.The pH scale is auniversally acceptedmeasure of the acidityof a solution.

A. Investigate and assess the Law ofConservation of Mass in specific chemicalreactions.

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11.A chemical test is a specialchemical reaction that allowsyou to identify an unknownsubstance.

A. Use chemical tests to identify the product(s)formed in a chemical reaction.

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12.When acids and bases reacttogether, they form a productwhich is neutral (neither acidicor basic).

A. Investigate and describe the reactionbetween an acid and a base.

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A. Relate the pH of a solution to its acidity.

B. Measure the pH of various solutions.

Grade Nine Science




10.S.D., pp. 32-35S.P.T., p. 91

11.S.D., pp. 47-50S.P.T., N/A

Grade Nine Science




14.The rate of a chemical reactionis dependent upon factors suchas temperature, concentration,and surface area.

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A. Determine the effect of temperature,concentration, and surface area on the rateof a chemical reaction.

B. Describe how changes in reaction rates canprove useful in our daily lives.

Grade Nine Science




Grade Nine Science


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GRADE 9 SCIENCE Chemical · PDF fileGRADE 9 SCIENCE Chemical Changes. ... demonstrate physical and chemical changes and relate their application to everyday ... Print Resources Notes