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2.2 Studying Matter & Energy

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Katelynn Dorn

on 4 September 2015

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Transcript of 2.2 Studying Matter & Energy

Scientific Method
Ask a question
Form a hypothesis
Do some background research
Test the hypothesis
Analyze the results
Draw conclusions
Assignment
2.2 Section Review
pg. 53
#1-2, 4-5, 7-10
Experiments May Not Always Turn Out As Expected
Silly Putty
Saccharin- artficial sweetener
the Microwave
Super Glue
Teflon
X-rays
Scientific Explanations
Hypothesis- explanation based on observations and can be tested
Variables- factors that affect the result of an experiment
control- one variable is kept constant from one experiment to the next
Independent variable- what changes from one experiment to the next
Dependent variable- the effect as a result of the dependent variable
Theories and Laws Have Different Purposes
Theory- explanation for phenomenon based on consistent observation, reasoning, and experimenting
Law- summary of many experimental results and observations, a law tells how things work
law of conservation of mass- products of a chemical reaction have the same mass as the reactants
Models
Represent an object, system, term, process, or idea
usually very simplified
can be used to show what happens during a reaction between a hydrogen molecule and an oxygen molecule
2.2 Studying Matter & Energy
Thank you!
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