(this question is from apex on course: physical science sem 2) which one of the following is an example of a composition reaction? a. 2na (s) + ci2 (g) → 2naci (s) b. zn (s) + 2hci (aq) → znci2 (aq + hz (g) c. cu (s) + 2agno3 (aq) → cu(no3)2(aq) + 2ag (s) d. caco3 (s) → cao (s) + o2 (g)

The density of a planet is 0.69 g/cm3 (density of water is 1.0 g/cm3). which of the following planets might this be? a. mercury b. venus c. saturn d. mars

What is the theoretical yield of carbon dioxide? a)0.993 gb)2.98 gc)3.65 gd)8.93 g

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende