Introduction to Gateways ..................................................x
A Word to the Teacher ...............................................................................x
Gateways to Science Features ................................................................xviii
Bibliography .............................................................................................xx
UNIT 1: Thinking like a Scientist .......................................2
Lesson 1: Safety .......................................................................................2
Lesson 2: Science and Scientists .............................................................9
Lesson 3: Observations and Inferences .................................................14
UNIT 2: Matter and Energy .............................................22
Lesson 1: Classifying Matter ...................................................................22
Lesson 2: Measuring Length .................................................................29
Lesson 3: Measuring Mass .....................................................................37
Lesson 4: Measuring Volume .................................................................48
Lesson 5: Density ...................................................................................56
Lesson 6: States of Matter .....................................................................67
Lesson 7: Boiling and Freezing/Melting Points .......................................77
Lesson 8: Conductors and Insulators .....................................................89
Lesson 9: Mixtures and Solutions ...........................................................95
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