Introduce and reinforce key lesson content using simple materials.
Comparing Precision 18
Comparing Heat Conductors 46
Identifying a Chemical Change 56
Observing the Effect of Temperature on Gas Pressure 79
Observing Phase Changes 90
Investigating Charged Objects 102
Comparing Excited States 117
Making a Model of a Periodic Table 128
Defining a Metal 135
Analyzing Inks 167
Modeling Molecules 173
Modeling a Mole 196
Identifying a Type of Reaction 203
Observing the Action of Catalysts 214
Comparing Heats of Solution 232
Using an Indicator 243
Making a Battery 248
Comparing Isomers 265
Distinguishing Sugars From Starches 278
Modeling Half-Life 300
Modeling Transmutation 304
Comparing Distance and Displacement 330
Observing the Effects of Friction 360
Investigating Inertia 365
Investigating Force and Distance 380
Changing Buoyancy 401
Using Friction to Change Mechanical Advantage 424
Comparing Lever Arms 429
Investigating Elastic Potential Energy 450
Exploring Energy Conversion 454
Cooling Air 476
Observing Convection 481
Observing Waves in a Medium 502
Comparing Frequency and Wave Speed 505
Evaluating Sunscreen 544
Comparing Fluorescent and Incandescent Light 559
Measuring the Height of Your Mirror Image 571
Building a Pinhole Viewer 585
Modeling Resistance in a Wire 606
Modeling a Fuse 614
Observing Magnetic Field Lines 632
Making an Electromagnet 636
Mineral Hardness 668
Observing the Size of Crystals 671
Modeling a Seismograph 687
Modeling the Water Cycle 705
Forming Sedimentary Layers 714
Demonstrating the Effect of Air Pressure 749
Modeling Air Masses 766
Modeling Orbits 797
Forming Planets 823
Calculating the Sun's Power 836
Modeling Expansion of the Universe 859