Which of these is a combustion and synthesis reaction? a. ch4 + 2 o2 → co2 + 2 h2o b. mg + o2 → mgo c. h2o → h2 + o2 d. cao → ca + o2

Which statement best describes the liquid state of matter? a. it has definite shape but indefinite volume. b. it has definite shape and definite volume. c. it has indefinite shape and indefinite volume. d. it has indefinite shape but definite volume.