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5 Which of the following is an example of the Law of Conservation of Mass?
(A) slowly eating an ice cream to make it last as long as possible
(B) wind rustles leaves in a tree
(C) a cup of ice melts and liquid water remains
(D) someone picks up trash in their neighborhood

2points what is the job of a scientist? a. to answer ethical questions. b. to write laws based on his or her knowledge. c. to ask and answer scientific questions. d. to ignore facts that do not support his or her theory.

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

State one important difference between a physical change and a chemical change?