Why is there a leap year every four years?

List four observations that indicate that a chemical reaction may be taking place

Part 1: include important facts found through your research. part 2: include your visual display. include your summary of “the chemistry of water” from the national science foundation website. include your experiment. part 3: include responses to the reflection questions.

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