What are 2 examples and 2 non-examples of pure substances

A sample of n2 effuses in 255 s. how long will the same size sample of cl2 take to effuse?

How is thermal energy transferred from Earth's core? Through the absorption of water heated by the sun Through convection that takes place in the atmosphere Through conduction from magma to water and rocks Through the sun's radiation that heats the

a chemist isolated a gas in a glass bulb with a volume of 255 ml at a temperature of 25 and a pressure of 10 torr. The gas weighed 12.1 mg. What is the molecular mass of this gas

Where are the heavy metals located on the periodic table

An ax ceramic compound has the rock salt crystal structure. if the radii of the a and x ions are 0.137 nm and 0.241 nm, respectively, and the respective atomic weights are 22.7 g/mol and 91.4 g/mol, what is the density of this material? 0.571 g/cm3

Can anyone tell me how to balance chemical equations

Nomadic people received income from where

How many milliliters of 0.755 m h2so4 solution is needed to react with 55.0 ml of 2.50 m koh solution? given: 2 koh (aq) + h2so4 (aq) → 2 h2o (l) + k2so4 (aq) ?

Ammonia is among the top ten synthesized compounds. Its many uses include the manufacture of ammonium nitrate and other fertilizers. Ammonia decomposes at high temperatures. In an experiment to explore this behavior, 2.

How to seperate sand and water