Why are proportional relationships useful in science

What are the products of the complete combustion of a hydrocarbon in excess oxygen

If the solubility of a gas in water is 5.0g/L when the pressure of the gas above the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 1.0 g/L

Example of an informational speech

Using the following thermochemical data, what is the change in enthalpy for the following reaction: 3H2 (g) + 2C (s) + ½O2 (g) → C2H5OH (l) C2H5OH (l) + 3O2 (g) →2CO2 (g) + 3H2O (l), ΔH = - 1367 kJ/mol C (s) + O2 (g) →CO2 (g), ΔH = - 393.

If a scientist has an initial sample of 200 g of carbon-14, how much will remain after one half-life?

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension

What gas was used as a deadly posiosn in world war 1?

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?