In the thermal decomposition of copper carbonate, the black solid left behind weights less than the original copper carbonate . why?

Which of the following statements concerning the influence of culture on ethnic identity formation is accurate? a. one will reject ethnic identity if cultural stereotypes are encountered. b. if one’s ethnic city is different from the dominant cultural group, then one’s ethnic identity you will become weekend. c. if an the ethnic group is excepted by dominant culture, then ethnic identity formation can be a difficult process. d. similarity to the dominant culture can determine how easy it is for one to except ethnic differences.

Element before carbon on the periodic table

Which factor is likely to impact the possible number of compounds ?