What mass of magnesium will react with excess hydrochloric acid to produce 500 mL of hydrogen gas at STP?

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural. question 2 reflects a moral or social value. question 3 refers to something that can be measured. question 4 reflects a question that can’t be observed.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)