4. Place a pin at a distance of about 5 cm from the magnet .Observe what happens. Is the magnet able to attract the pin?

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.