Why is the enthalpy of formation of oxygen zero?

why is it important to use the correct number of significant digits when reporting the results of an experiment

several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear is white. What process led to to this difference in fur color.

The enthalpy of a reaction for a chemical change can be determined by

What type of reaction is : calcium carbonate + HCL = calcium chloride + carbon dioxide + water.

Imagine that the reaction 2 CO (g) + O2 (g) - -> 2 CO2 (g) occurs in a container that has a piston that moves to maintain a constant pressure when the reaction occurs at constant temperature.

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

What is the product of the chemical reaction ... Au+O2

Compare and contrast the compounds CH4 and PH3 in terms of covalent bonding, molecular geometry (shape), and intermolecular forces. Which substance would experience a stronger attraction between its molecules, and why?

How do consumers energy