Which equation is not balanced?

A 2Mg (s) + O2 (g) → 2MgO (s)

B 2Mg (NO3) 2 (s) → 2MgO (s) + 4NO2 (g) + O2 (g)

C MgO (s) + HCl (aq) → MgCl2 (aq) + H2O (1)

D Mg (s) + CuSO4 (aq) → MgSO4 (aq) + Cu (s)

A. What happens when the two atoms are fairly close?

Does sugar dissolved in pure water conduct electricity

Under which conditions will gases best dissolve in liquids? A) When the pressure is low and the temperature is low B) When the pressure is high and the temperature is high C) when the pressure is low and the temperature is high D) when the pressure

What is the relationship between matter and elements

What is the density of carbon dioxide, co2, at stp?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

Science is a unique field of thought because it relies on to describe the world. •Observations and experim •Teachers and students •Books and writings •Scientists and statements

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

What could you predict about a methane molecule that would most likely be made by using both the quantum model of the atom and John Dalton's model?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?