In diagrams of atoms, protons are shown by a plus sign (+). This represents the proton’s charge of +1..

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

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Nan element’s square on the periodic table, the number with the greatest numerical value represents the