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Chapter 2 Section 3 Changes of Matter
Terms in this set (15)
Affects one or more physical properties of a substance without changing the identity of the substance. Breaking chalk.
Example of ___ ___ are boiling water, sanding a piece of wood, and mixing sand and water.
Do the molecules of water and sugar change as sugar dissolves?
When sugar dissolves in water or tea, the molecules do not ____. In other words, the components of the mixture keep their identities.
Melting and freezing
Examples of physical changes
Happens when one or more substances change into a new substances that have different properties.
The identity changes because atoms rearrange
What happens during a chemical change?
Atoms are ____ ____ during a physical change.
During a chemical change, however, atoms re-arrange to form ____ substances.
bending a metal rod, breaking glass, and painting wood
burning wood, cooking, and burning propane
Why is dissolving a physical change.
The properties of the compound are unaffected
Explain how a chemical change occurs when bread is baked.
Ingredients are heated and chemical bounds are broken. New substances are formed that have properties that are different from original ingredients.
Compare physical changes and chemical changes.
A physical change affects one or more physical properties of a substance. In a chemical change, one or more substances change into new substances with different properties.
list four ways to detect that a chemical change has occurred.
Change of color, change in odor, production of heat or light, and formation of bubbles-a gas is produce
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 2 Section 1 Classifying Matter
Chapter 2 Section 2 Properties of Matter
Chapter 3 Section 1 Matter and Energy
Chapter 3 Section 2 Changes of State
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