For the following chemical equation 2 Al (s) 6 HCl (aq) > 2 AlCl3 (aq) 3H2 (g) How many grams of Al should be mixed with hydrochloric acid to obtain the hydrogen gas conditions of 2.06 L, 301 K and 2.25 atm

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

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

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.