Randy is observing an experiment on heat flow. He has three different objects at differing temperatures as shown below. Which of the following correctly describes the flow of heat in this system

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Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Word equation for k(s) +h2o(l) yield koh (aq) + h2