SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Look at the formula below. Identify the reactants and products Contrast

SPI 0807.9.10 Reactants & ProductsSPI 0807.9.11 Law of Conservation of Mass

Look at the formula below. Identify the reactants and productsContrast reactants and products (how are they different?)

C + O2 CO2

Notes Press the Right Arrow Button to Advance through the Presentation!

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Contrast reactants and products (how are they different?)Reactants-are the starting materials in a chemical reactions Remember: the arrow ALWAYS points away from the reactants!

C + O2 CO2

SPI 0807.9.10 Reactants & ProductsSPI 0807.9.11 Law of Conservation of Mass Notes

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1) Contrast reactants and products (how are they different?)Products- are the substances formed in a chemical reaction Remember: the arrow ALWAYS points towards the products!

C + O2 CO2


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Title: LOCOM Review Questions

Instructions: (A) Write this assignment title on your paper. (B) Then number your paper from 1 to 17. (C) Write the answers on your paper(D) Review the previous slide(s) to help you(1) ________ and _______ are the 2 parts of all chemical reactions.(2) _________ are the starting materials in a chemical reaction.(3) _________ are the substances you produce in a chemical reaction.(4) In chemical reactions, the arrow points away from the _______.(5) In chemical reactions, the arrow points towards the _________.

Review Questions

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3 key TopicsChemical symbolsChemical FormulasChemical Equations


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Key TopicsChemical symbols

Examples: H is just a chemical symbol (for the element hydrogen)O is just a chemical symbol (for the element oxygen)Fe is just chemical symbol (for the element iron)


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Key TopicsChemical formulas

Chemical symbols combined together = chemical formulas

Examples: Put the symbols H (hydrogen) and O (oxygen) together…

…and you get the formula for water… H2O


Examples: Put the symbols Na (sodium) and Cl (chlorine) together…

...and you get the formula for sodium chloride… NaCl

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Instructions: -Write the answers on your paper-Review the previous slide(s) to help you(6) List 3 key topics that you need to know when learning about chemical reactions.(7) Write any two examples of chemical symbols.(8) Write any two examples of chemical formulas..

Review Questions

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Key TopicsChemical symbols & Chemical FormulasVery Important!!!symbols & formulas must be written correctly. CO2= one carbon atom, two oxygen atomsCO= one carbon atom, one oxygen atomCo=one cobalt atom2CO= two carbon atoms, two oxygen atoms2CO2= two carbon atoms, four oxygen atoms


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Key TopicsChemical symbols & Chemical Formulas

QUICK REVIEW!

CO2

Is this a chemical symbol or a chemical formula?Is this a mixture or a compound? How many total atoms does it contain?Identify the individual atoms.


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QUICK REVIEW!

CO2

Is this a chem symbol or chem formula?It is a chemical formula


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QUICK REVIEW!

CO2

Is this a mixture or a compound? It is a compound


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QUICK REVIEW!

CO2

How many total atoms does it contain?Three


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QUICK REVIEW!

CO2

Identify the individual atoms.

= one carbon atom, two oxygen atoms


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Instructions: -Write the answers on your paper-Review the previous slide(s) to help you(9) Is H2O a chemical symbol or chemical formula?(10) The chemical formula CO2 is a compound. How can you tell?(11) H2O contains three total atoms. How many hydrogen atoms does it contain, and how may oxygen atoms does it contain?

Review Questions

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Key TopicsChemical Equations

Chemical formulas combined together = chemical equations

Examples:

Equation: 2H2 + O2 2H2O

Equation: 2Na + Cl2 2 NaCl


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2 parts of chemical equations (1) reactants (2) productsReactants: are the things you are combing together…the things you start with in a chemical reaction

Products: are the things that you produce in a chemical reaction… the things you end up withExample: 2H2 + 02 2H20


Reactants (H & O) Products (water)

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Title: Acid Review Questions

Instructions: -Write the answers on your paper-Review the previous slide(s) to help you(12) What do we call the substances created in a chemical reaction?(13) When you see two chemical symbols being added together this is called a chemical __________?(14) Copy down the chemical equation shown below in. Next draw a circle around the reactants.Then draw a rectangle around the products.2H2 + O2 2H2O

Review Questions

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Chemical Equations show how chemical reactions occur, and they must obey the LAW OF CONSERVATION OF MASS!

The law of conservation of mass: Atoms are never lost or gained in a chemical reaction…

… they are just rearranged.

Example: Look at the following bad/wrong equation. It DOES NOT obey the law of conservation of mass and is called unbalanced. This equation is wrong.

(count the atoms on each side!) H2 + O2 H2O

2 & 2 2 & 1 Four is not equal to three!


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Balancing Equations: make sure the number of reactants atoms equals the number of products atoms. If they are not equal, you must balance the equation

(See below for an example)Same equation as the previous slide, but now I have balanced it

(count the atoms on each side)2H2 + O2 2H2O

Coefficient=number in front of a chemical symbol or formula (tells you to multiply)Subscript=small number below and to the right of a chemical symbol (tells you the number of atoms)

4 Hyd + 2 Oxy yields 4 Hyd and 2 Oxy6 reactant atoms is equal to 6 product atoms!


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Instructions: -Write the answers on your paper-Review the previous slide(s) to help you(15) The law of conservation mass states that atoms are never _____ or gained in a chemical reactions, instead the atoms are merely ____________.(16) Look at the chemical equation shown below. It is unbalanced.How can you tell that this equation is unbalanced?2H2 + O2 H2O

(17) Look at the balanced chemical equation shown below. How can you confirm that it is balanced?2Na + Cl2 2 NaCl

Review Questions

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Instructions: (A) Click on the study guide link below.(B) Do the study guide until you earn a 100 on itStudy Guide Link: See the link under my April 11th website entry

(C) Next click on the class work assignment below(D) When complete, click the "Grade & Submit" button. (E) Your grade will be emailed to Mr. ElliottClass work Link: See the link under my April 11th website entry

Review Questions

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Documents

SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Look at the formula below. Identify the reactants and products Contrast