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Physical and Chemical Properties/Changes
1Ms. Mormando's Class
Physical vs. Chemical Graphic Organizer
Ms. Mormando's Class 2
What is Matter?
Explain the physical properties of matter.
Explain the chemical properties of matter.
What is physical change?
Provide real-world examples of physical change.
What is chemical change?
Provide real-world examples of chemical change.
What is Exothermic Reaction?
What is Endothermic Reaction?
Reviewing MATTER
• Matter: anything that has mass and takes up space– Mass – the amount of matter in something
– Volume – the amount of space something occupies
• Which of the following is matter?– A car?
– A box?
– You?
Yes!
Yes!
Yes!
3Ms. Mormando's Class
What is a property?
• Property: a characteristic of a substance that can be observed
4Ms. Mormando's Class
Physical Properties
• Physical properties can be observed and measured without changing the kind of matter being studied.
• Examples:
– Melting point
– Boiling point
– Density
– Color
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Chemical Properties• Chemical Properties can be recognized only
when substances react or do not react chemically with one another; when they undergo a change in composition
• Examples:
• - Flammability
• - Reacting with Oxygen • Rusting
- Reacting with Acids
• Metals react to form compounds
• Bases react to form water and neutralize6Ms. Mormando's Class
What is a physical change?
• The chemical composition of the substance does not change
• Changes in size, shape, or state of matter
Example:
Tearing paper
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What is a chemical change?
• A change in which a new/different substance is formed
Example: burning paper
8Ms. Mormando's Class
9Ms. Mormando's Class
Chemical Changes
• Indicators of a chemical change:
•Evolution of light
•Evolution of heat
•Evolution of a gas
•Color change
•Formation of a precipitate
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Color Change
• Substance often change color during a chemical reaction.
• Example: when gray iron rusts, the product that forms is brown.
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Formation of a Precipitate• Precipitate: A solid product formed when
chemicals in two liquids react.
• Example: Seashells are formed when sea creatures release a liquid that reacts with seawater.
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Formation of a Gas
• Chemical reactions may produce a gas, like that often formed when antacid pills are mixed with excess stomach acid.
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Temperature Change
• Most chemical reactions involve temperature change
• Example: Concrete gets warmer as it hardens
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Evolution of Light
• Energy can be released in the form of light during a chemical reaction
• Example—Glow Sticks
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Endothermic and Exothermic
Reactions• Exothermic Reactions: If more energy is released when
the products form than is needed to break the bonds in the reactants then energy is released during the reaction
– Energy is released (Exit)
• Endothermic Reactions: If more energy is required to break the bonds in the reactants than is released when the product is formed then energy must be added to the reaction
– Energy is absorbed (Enter)
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Is it Physical or Chemical?
Change Physical Chemical
Melting cheese
Burning wood
Milk souring
Wadding up paper
Bicycle rusting
17Ms. Mormando's Class
Physical or Chemical Change?Tearing paper ______________
Melting ice ________________
Digesting food _____________
Rusting bicycle _____________
Chopping Wood ____________
Baking a cake ______________
Making salt water ___________
Burning wood ______________
18Ms. Mormando's Class
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