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Physical/Chemical Changes
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Admit Slip
Identify the following as elements or compounds:
C
C6H12O6
H2
CO2
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Today’s Objectives:
Students will be able to: Define and compare elements, compounds, and
pure substances Describe chemical changes, physical changes,
and conservation of matter
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Agenda
Discussion Homework Check/Review Notes Questions Exit Slip
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Notes
During a physical change, some properties of a material change but the composition does not change.
Physical changes include boiling, freezing, melting, condensing, breaking, filtering, distilling, cutting, separating, and mixing.
They may change the physical form of matter but do not change its composition.
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Notes
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”
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Notes
In a chemical reaction, the substance at the beginning is called a reactant and the end result is a product.
H2O H2 + O2
Reactants Products
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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.
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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.
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Question 1
Identify the following as mixtures, elements or compounds:
Green ink
O2
Fruit punch
Salt, NaCl
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Question 2
Identify the following as mixtures, elements or compounds:
Copper
Ice
Sugar water
CaS
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Question 3
Identify the following as mixtures, elements or compounds:
Sugar, C6H12O6
soda
CH4
Fluorine
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Question 4
Classify each of the following as a physical or chemical change: Explain why.
A copper wire is bent
Charcoal burns in a grill
Bread dough rises when yeast is added
Sugar dissolves in water
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Question 5
In your own words, what is the difference between an element and a compound?
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Question 6
In your own words, what is the difference between a compound and an mixture?
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Question 7
When ammonium nitrate NH4NO3 explodes, the products are nitrogen, oxygen, and water. When 40 g of ammonium nitrate explode, 14 g of nitrogen and 8 g of oxygen form.
How many grams of water form?
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Exit Slip/Homework
Exit Slip: Show me your work from today.