SKILL BUILDER 3

 Divide the folowing list of reactions int two groups by classifying each reaction as endothermic or exothermic: burning wood, striking a match to ligth it , baking bread, and  exploding dynamite. Explain why you placed each  reaction into one groups . If you need help, refer  to classifyng in the skill handbook on page 753 






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WHAT I LEARN

WHAT I LEARN  KINETIC THEORY OF MATTER  is the energy moving  particle in constant motion called kinetic theory of matter  . state of matter are liquids , gas, solids  , matter is anything that takes up space and has mass Atoms  The atoms are the smallest particle that makes up a given type . Two atoms of hydrogen form water molecule  most matter is made of atoms that  invisible  and cannot see and touch . Matter in Motion   the constant irregular of particles in air . Robert Brown   comes the Brownian motion that  the idea   that the particles  of all matter are in constant  , random motion that is  no as  kinetic theory of matter TEMPERATURE AND HEAT   When particles moved  fast are in heat} When particles not moved are cooled   
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SKILL BUILDER

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A  pendulum swings seven times per minutes . If  the string  were half as long,the pendulum would swing  ten times per minute.If the original length   were twice as long the pendulum would swing five times per minute . Make bar graph that shows these data . Draw conclusion from the result  .  ANSWER  Time (Min) 1 2 3 4 5 swings (1)l 7 14 21 28 35 (1/2) l 10 20 30 40 50 2l 5 10 15 20 25 Conclusion  =  the shoter length  of the rope the greater the oscillation
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SKILL BUILDER 2

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When selecting an energy source for heating a home , consumers try to think about cost. use proportions to determine the area of the solar collector needed to heat a home collector area (ft2) 400 800 1200 1600 2000 2400 living space (ft2) 1200 2400 3600 4800 6000 7200
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