How can a redox reaction be used as a source of electrical energy?

A. Two half-reactions must be physically separated.

B. Two half-reactions must involve more than one electron.

C. One half-reaction must use a metal wire electrode.

D. One half-reaction must involve two metals.

What is the relationship of air masses and the temperature of oceans?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?