Which technique is used to compare ink on a suspect document?

A) thin-layer chromatography

B) infrared spectrophotometry

C) blotting with alcohol method

D) ultraviolet spectrophotometry

A compound consists of 18.96 g carbon, 5.53 g hydrogen, and 11.06 g nitrogen

Electrons have A) A positive charge and relatively low mass B) A negative charge and relatively high mass C) A neutral charge and relatively high mass D) A negative charge and relatively low mass

Which best decribes a similarity between power plants that use water as an energy source

How do concentrated basic solutions differ from other basic solutions?

Which ones better, old youngboy or new youngboy?

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?