What is an acid in chemistry?

What kind of waves are used in many forms of communication

As the number of electrons added to the same principal energy level increases, atomic size generally A. increases. B. decreases. C. remains the same. D. varies randomly.

A helium balloon contains 0.40 g of helium. given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed

When an aqueous solution at room temperature is analyzed, the [H+] is found to be 2.0 * 10-3 M. What is the [OH-]? A. 5.0 * 10-12 M B. 2.0 * 10-11 M C. 4.0 * 10-6 M D. 5.0 * 10-11 M

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.

Which of the following terms is defined by the measure of mass per unit of volume? gravity density weight acceleration

Select the lon. O NO₂ H2SO4 O A3

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.