Balance these scientific equations:

MgO + HB - > MgBr2 + H2O

N2 + O2 - > N2O5

C2H4 + O2 - > CO2 + H2O

Fe + HCI - > FeCl2 + H2

During which era did the supercontinent Pangaea break up? A - Paleozoic B - Mesozoic C - Precambrian D - Cenozoic

Describe how you would make 1.0 l of a supersaturated solution of cdi2

Which element would most likely have a positive electron affinity?

When 6.25 grams of pure iron are allowed to react with oxygen, a black oxide forms. if the product weighs 8.15g, what is the empirical formula of the oxide?

For which of the following is the van't Hoff factor 2, assuming complete dissociation? a) Calcium phosphate b) Aluminum chloride c) Calcium chloride d) Sodium chloride

What is the name of an object containing both elements #29 and 30 with element #30 in the center surrounded by element #29?

Check every statement about the use of energy by living things that is true. Plants perform chemical reactions that require energy. Animals can use energy from the sun to produce their own food. Plants receive their energy from water in the soil.

Type of bond between na+1 ion and Cl-1 ion is ion

Does a liquid release energy or absorb energy when it changes into a gas? into a solid?

Is a sodium cation smaller or larger than a sodium atom