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Physical/Chemical Changes . Admit Slip. Which of the following is a homogeneous mixture and why? A.Water H 2 O B.Tomato juice C.A turkey sandwich D.Table salt, NaCl. Today’s Objectives:. Students will be able to: - PowerPoint PPT Presentation
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Physical/Chemical Changes
Admit Slip Which of the following is a homogeneous
mixture and why?A. Water H2OB. Tomato juiceC. A turkey sandwichD. Table salt, NaCl
Today’s Objectives: Students will be able to:
Define, compare and contrast mixtures, heterogeneous mixtures, homogeneous mixtures, phases, elements, compounds, and pure substances
Define and compare physical and chemical changes
Agenda Homework Check/Review Notes Questions in our Notes Exit Slip
Product: Notes and QuestionsHomework: Reading and questions from book
Homework due Thursday
College Prep Chemistry (Double HW) Read pages 357 – 364 in your Chemistry
book And Answer the following questions; Pg. 359 # 1 Pg. 360 #5 Pg. 364 # 1, 3, 4, 7
Homework due Thursday
Honors Chemistry (Triple HW) Read pages 41-42, 44-47, and 48- 51, and
53-55 in your Chemistry book And Answer the following questions; Pg. 42 #3, 4 Pg. 47 #11, 14, 16 Pg. 52 # 20, 24, 27 Pg. 55 # 28 – 34
Homework Review1. What are the two types of mixtures?
2. How are mixtures separated: by a chemical or physical process?
3. Name a few of these methods used to separate mixtures
Homework Review
4. Give an example of each type of mixture.
5. Which of these is not a mixture?A. oil and waterB. sand and waterC. diet sodaD. all are mixtures
Physical and Chemical Changes 2/5/13
During a physical change, some properties of a material change but the composition (makeup) does not change.
Physical changes include boiling, freezing, melting, condensing, breaking, filtering, evaporating, distilling, cutting, separating, dissolving, and mixing.
Physical changes may change the physical form or state of matter but do not change its composition.
During a chemical change, the composition of the matter always changes. A chemical change is also known as a chemical reaction.
Words that indicate chemical changes are “reacts, burn, rot, rust, decompose, ferment, explode, and corrode”
Notes In a chemical reaction, the substance at the
beginning is called a reactant and the end result is a product. In a chemical reaction, the products will be different from the reactants.
H2O H2 + O2 Reactants Products
Notes Possible clues to a chemical change/reaction
include energy transfer, a color change, the production of a gas, or the forming of a precipitate.
A precipitate is a solid that forms and settles out of a liquid mixture during a reaction.
Notes During a chemical reaction or physical
change, the mass of the products always equals the mass of the reactants.
This is the Law of Conservation of Mass. Mass can not be created or destroyed.
Notes
Question 1
Identify the following as mixtures, elements or compounds:
Green inkO2
Fruit punchSalt, NaCl
Question 2
Identify the following as mixtures, elements or compounds:
CopperIceSugar waterCaS
Question 3
Identify the following as mixtures, elements or compounds:
Sugar, C6H12O6
sodaCH4
Fluorine
Question 4 In your own words, what is the difference
between a pure substance and a mixture?
Question 5Classify the following as homogenous or heterogenous mixtures:
a) Food coloringb) Ice cubes in sodac) mouthwashd) mashed unpeeled potatoes
Question 6
What is the difference between a physical and chemical change?
Exit Slip
Classify each of the following as a physical or chemical change: Explain why.
A copper wire is bentCharcoal burns in a grillBread dough rises when yeast is addedSugar dissolves in water
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