What four elements did the ancient greeks think the world was made of?

A sample that weighs 107.75 g is a mixture of 30% helium atoms and 70% krypton atoms. How many particles are present in the sample?

An unknown compound has the following chemical formula: Mg_xCl_2 where x stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 6.80 mol of magnesium and 13.56 mol of chlorine.

What two things does pressure of gas depends on

Determine the elements present in sodium hydrogen carbonate

According to the animation, what does the electron transport chain do to the concentration of hydrogen ions (protons)

Why are 3 ammonium groups needed for every 1 nitride ion?

How do you explain the relativity high conductivity of tap water compared to a low or zero conductivity for distilled water

According to Newtons's first law, which characteristic of a moving object would remain constant if there were no other force of acting of it? A. Size B. Mass C. Shape D. Speed

Standard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).

Which compound is inorganic? a. glucose (c6hl2o6) b. carbon dioxide (co2) c. ethane (c2h6) d. stearic acid (cl8h36o2) ?