The red appearance of Mars is caused by the presence of what ? My answers are methane , hydrogen ,carbon dioxide, iron oxide !

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

What is the mass of 0.46 mil of mgcl2