How much heat is needed to melt 50 kg block of copper?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.