Why does hot air rise and cold air sink?

The general mass balance equation is: In - Out + Generation - Consumption = Accumulation If the balanced quantity is a non-reactive species (neither a product or reactant), which terms should be set to zero?

What would the charge be on an atom with 9 protons 9 electrons and 10 neutrons

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

N2 (g) + 2O2 (g) + 2 NO2 (g) 3NO2 (g) + H2O (g) = 2HNO3 (aq) + NO (g) a. a car burns 4.00 x 10^2 g of N2. How many grams of HNO3 will be produced? b. what is the minimum amount of O2 needed in grams?

Bricks made of mud dried in the sun are

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate

What do you think 1,5-pentanedithiol C5H12S would smell like

If an atom has sp hybridization in a molecule: the maximum number of σ bonds that the atom can form is

What is an oxidizing agent?

In times of hot dry weather some cities ban the use of garden sprinklers why do you think there is such a rule