What causes the colors observed during a flame test

The main substances in air are N2 (nitrogen), O2 (oxygen), CO2 (carbon dioxide), H2O (water), and Ar (argon). Which of these substances are elements? Which are compounds? Which are molecules?

Which alkane is used in many lighters?

These three members of the Noble gas family (helium, neon, and argon) all have one property in common because they are gases at room temperature. That is they A) are combustible. B) are compressible. C) are relatively dense.

How do mass and volume relate to density?

At the same pressure, about 25 times more co2 will dissolve in plasma as o2. why does this occur?

If a compound has a molar mass of 180 g/mol and its empirical formula is CH20, what is its molecular formula? CH20 C₂H4O2 C6H1206 C12H22011

Which element has six energy levels? A) rubidium (Rb) B) cesium (Cs) C) potassium (K) D) sodium (Na)

What is a segment of dna that contains a single unit of information?

Is carbon monoxide covalent or ionic?

Do all organisms perform meiosis?