I- i let my ask fall off what have i done now they know

What type of reaction is zn + cucl2 → cu + zncl2?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

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.