Who discovered that geologic changes are cyclical?

If an unknown quantity of gas is held at a temperature of 789 K in a container with a volume of 22.0 L and a pressure of 765 torr, how many moles of gas are there?

Ethanol is used as fuel for cars. Explain how energy is obtained from ethanol to fuel a car.

Calculate the expansion work done on the system when exactly 1 mol of solid ammonium chloride, nh4cl, decomposes completely to yield gaseous ammonia, nh3 and hydrogen chloride, hcl at a temperature of 1250 k.

Three carbon atoms are linked by single covalent bonds such that they form the shape of a v. all of the unshared electrons form covalent bonds with hydrogen. how many hydrogen atoms does this molecule contain?

A student pours exactly 26.9 mL of HCl acid of unknown molarity into a beaker. The student then adds 2 drops of the indicator and titrates the acid to neutrality using 43.7 mL of 0.13 M NaOH base. a.

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.

One mole of which hydrocarbon requires 8 mol o2 to achieve complete combustion to give carbon dioxide and water?

How many bromine atoms are present in 39.9 g of CH2Br2