Why is an element considered a pure substance?

How many electrons do two atoms in a double covalent bond share?

Consider the following reversible, exothermic chemical reaction: 2C2H2 (g) + 5O2 (g) ↔4CO2 (g) + 2H2O (g) All BUT one of the conditions will cause equilibrium to shift right and produce more of the products.

When water exposed to the air changes from liquid to gas

What happens to the solute particles when a solution forms?

A solution was prepared by dissolving 31.0 g of kcl in 225 g of water. part a calculate the mass percent of kcl in the solution.

Classify these compounds as ionic or molecular. ncl3 nabr

If 3.64g of sand is separated from 5.25g of a mixture of salt and sand what is the percentage of sand in the sample

At what celsius temperature does 0.750mol of an ideal gas occupy a volume of 35.9L at 114kPa

Which mineral (s) might you be examining if you place some hydrochloric (hcl) acid on a sample and it fizzes?

How many grams of aluminum are required to give a total dislocation length of 3,000 miles (enough to stretch from New York City to Los Angeles assuming you could align all the dislocations into a single line like a string).