QUESTÃO 1 - A equação que representa corretamente a combustão total do eteno, C2H4, é * A) C2H4 + O2 = 2 CO2 + 2 H2O B) C2H4 = 2 CO2 + 2 H2O C) C2H4 + 2 O2 = 2 CO2 + 2 H2O D) C2H4 + 3 O2 = 2 CO2 + 2 H2O E) C2H4 + 4 O2 = 2 CO2 + 4 H2O

e

explanation:

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.