What must models and theories do in order to remain valid

A body that's moving with a negative acceleration is said to be?

In the ideal gas equation, 'n' represents the:

In the environment, arsenic is found in inorganic and organic forms and in different valence or oxidation states based on geology, pH, redox status and microbial processes. True / False.

So for my science project it wants me to list the name of source. what is the [name of source]

The Haber-Bosch process is used to make much of the world's fertilizer. It works on the equilibrium between dihydrogen, dinitrogen and ammonia via the following equation: N2 (g) + 3H2 (g) 2NH3 (g) What needs to be done in order to push the reaction

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.

Describe the attraction between 2 atoms as a result of sharing electrons

I need to know about mitosis and meiosis

What is sediment and debris, and what role does it play in the way sedimentary rock forms?