When copper metal is heated to 1100 oC it melts. Is this a chemical or physical change? Explain your answer

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.

Is 343 in the sequence -5, -2, 1, 4, 7

Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.