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Unit 1 Lesson 2

Changes to Matter

What is a change in matter that does not change what the object is? Physical Change
What are some examples of physical changes? tearing up a piece of paper and melting or freezing water. The paper is still paper after it has been torn and the water is still water, whether it is frozen or not.
What changes the matter into a new substance? Chemical Change
What are some examples of chemical changes? lighting a piece of wood on fire, metal rusting, baking a cake, breaking of a glow stick, putting a balloon over a mixture of vinegar and baking soda
What is a combination of substances that can be physically separated? For example, a salad. mixture
What is one way to separate a mixture? a mixture of iron filings and sand can be separated by the use of a magnet to pull the iron filings out
What states that an object has the same mass or weight even when it goes through a change? The law of conservation of mass
Heat changing a solid to a liquid is called? melting
Heat changing a liquid to a gas is called? evaporation
Liquid cooling and changing to a solid is called? freezing
A gas cooling and changing to a liquid is called? condensation
What causes water droplets on the outside of a glass? Condensation - The warm air hits the cold glass and condensates into a liquid.
A cup of water might weigh _________ after heating because some of the water has ________________ . less evaporated
What is another example to separate a mixture? a mixture of salt and water can be separated by boiling away the water until it becomes water vapor and all that is left is the salt. Finally you can use a strainer to trap solid pieces from a liquid mixture.
Created by: rleblanc33
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