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