10.4 chemical properties and changes 10/19/2015 add the new notes to your table of contents, and...
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10.4 Chemical Properties and Changes10/19/2015
Add the new notes to your table of contents, and then turn to the next clean page
and set up your title and date
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• A chemical property is a characteristic of matter that can be observed as it changes to a different type of matter.
Chemical Properties
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• Ability to burn (flammability)
• Ability to rust
• Ability to tarnish
What are some chemical properties of matter?
• Ability to rot
• Ability to spoil
• Acidity
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• A chemical change is a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties.
• The substances that undergo a chemical change no longer have the same properties because they no longer have the same identity.
Chemical Changes
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• Chemical properties describe the abilities of matter to change
– Examples: ability to burn, ability to rot, ability to spoil
• Chemical changes are actual events that change matter
– Examples: burning, rotting, spoiling
What makes a chemical change different from a chemical property?
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Chemical Changes (cont.)
What is the difference between a physical change and a chemical change?
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Chemical Changes (cont.)
What is the difference between a physical change and a chemical change?
A physical change can be observed without changing the matter's identity, a chemical change can only be observed as the matter becomes something different
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• How do you know when a chemical change occurs?
–Signs of chemical changes include:
• the formation of bubbles,
• a change in odor,
• a change in color, or
• a change in energy
Signs of Chemical Change
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• These signs do not always mean a chemical change occurred.
• The only proof of chemical change is the formation of a new substance.
Signs of Chemical Change
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• Recall that particles in matter are in constant motion. As the particles move, they collide.
• If the particles collide with enough force, the bonded atoms that make up the particles can break apart. Then the atoms rearrange and bond with other atoms.
• When atoms bond together in new combinations, new substances form. This process is called a chemical change or a chemical reaction.
Chemical Reactions
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• A useful way to understand what happens during a chemical reaction is to write a chemical equation.
• A chemical equation shows the chemical formula of each substance in the reaction.
Chemical Reactions
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• In a chemical equation, the number of atoms of each element before a reaction must equal the number of atoms of each element after the reaction.
• This is called a balanced chemical equation, and it illustrates the conservation of mass.
• When balancing an equation, you cannot change the chemical formula of any reactants or products.
Chemical Reactions & Conservation of Mass
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• A chemical property is observed only as a material undergoes chemical change and changes identity.
• Signs of possible chemical change include bubbles, energy change, and change in odor or color.
• Chemical equations show the reactants and products of a chemical reaction and that mass is conserved.
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A. chemical change
B. chemical equation
C. chemical formula
D. physical change
Which term refers to a change in matter in which the substances that make up the matter change into other substances with new physical and chemical properties?
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A. same number of atoms
B. same number of compounds
C. same number of molecules
D. same number of reactants
What must a balanced chemical equation have on both sides of the equation?
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A. Paper is shredded.
B. Liquid wax turns solid.
C. A raw egg is broken.
D. A wood log is burning.
Which is a chemical change?
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7. When wood burns, new materials form.
8. Temperature can affect the rate at which chemical changes occur.
Do you agree or disagree?