29 terms

Unit 2 L 5 Physical & Chemical Changes VOCAB/REVIEW ?'s

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physical change
alters the form of an object without changing what type of matter it is
chemical change
a change in matter in which the substances that make up matter change into other substances
precipitate
a solid that sometimes forms when two liquids combine
photosynthesis
plants chemically change carbon dioxide and water into oxygen and food
The particles that make up matter do not change during a _______________.
physical change
What are the signs that indicate a roasting marshmallow is undergoing a chemical change?
it is burning, the odor, no longer white which forms a new substance
Compare and contrast physical and chemical changes.
chemical combines substances and
physical describes a substance
Describe how you could physically change a piece of paper.
by folding it
Create a list of three physical changes you have observed recently.
breaking a dish, and snow melting
How do physical and chemical changes alter Earth's surface?
forest fires
How do physical and chemical changes to matter compare?
alters without changing the type of matter
An example of a chemical change is:
when iron rusts
Suppose you mix baking soda and vinegar. What signs might indicate that a chemical change is occurring.
the formation of bubbles
Tearing a piece of paper in half is an example of a _________ change because the paper is still paper.
physical
Change of ________ is also an example of a physical change.
state
When a substance changes from solid to liquid to gas, the substance's _____________ does not change.
chemical identity
When ice melts, the liquid is still _______.
water
When substances combine to form a ________, a physical change takes place.
mixture
During an ____________, new substances with new properties form.
chemical change
The substances that are formed from a chemical change have different properties because their atoms are arranged ___________ from the starting substances.
differently
Iron can combine with_________ to form a new substance called rust. Rusting is an example of a chemical change.
oxygen
Chemical changes are occurring all around you. For example, plants can change carbon dioxide and water into oxygen and ______.
food
Evidence that a chemical change has occurred included a change in _______.
color
Another sign of a chemical change is the release or absorption of _________.
energy
This energy could be in the form of light, _____, or sound.
heat
The __________ of a gas is another sign of a chemical change taking place.
formation
Sometimes, two liquids react to produce a solid. This solid is called a ________.
precipitate
Many physical changes can be ________ easily. Chemical changes are NOT reversed easily.
reversed
Another way to determine the type of change is to look at the _____________ of the substance before and after the change. If they are _________, a chemical change has taken place.
chemical properties, different
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