Which two gases make up most of the atmosphere?

How much lead (ii) iodate, pb (io3) 2 (molar mass = 557.0 g/mol), is precipitated when 3.20  102 ml of 0.285 m pb (no3) 2 (aq) are mixed with 386 ml of 0.512 m naio3 (aq) solution? pb (no3) 2 (aq) + naio3 (aq)  pb (io3) 2 (s) + nano3 (aq) ?

When an atom undergoes beta decay, wich of the following is true?

Oil is burn exothermic

Alkanes with a branch coming off the straight chain are identified as substituted alkanes. what would be the name of a straight chain made of 8 carbons with - ch3 groups on the second and fifth carbons?

Substance A and B are colorless, odorless liquids that are nonconductors and flammable. The density of substance A is 0.97 g/mL; the density of substance B is 0.89 g/mL. Are A and B the same substance? Explain your answer.

What's the difference between Mixture and Solution?

Which describes the alkalaine solution? A) pH less than 7 B) pH equal to seven C) basic D) acidic

Limestone is primarily a crystal form of caco 3 . How many moles of oxygen are in a 1.25 mol sample of caco 3 ? Only include the numerical value in your answer. Do not include units.

The expression of 5522 km in scientific notation is

Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm. What is the radius of a gallium atom?