Which is an example of a chemical reaction?

a)
melting ice

b)
rusting iron

c)
water evaporating

d)
rubbing a marker on paper

Perform the following mathematical operations and report the answer to the appropriate number of significant figures 5.87998 + 3.100

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.