Which of the following is not an acid-base neutralization reaction? (3 points) nh3 + hcl yields nh4cl naoh + ch3cooh yields na ch3coo + h2o 2hno3 + ca(oh)2 yields ca(no3)2 + 2h2o h2so4 + 2nacl yields 2hcl + na2so4

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.