Which statement is true about elements?

Select one:

a. They are finite in number.

b. They are infinite in number.

c. They combine to form atoms.

d. They combine to form electrons.

How many compounds can i make with Sodium Calcium Hydrogen oxygen Carbon and chlorine

Which will contain the greater number of moles of potassium ion: 30.0 ml of 0.15 m k2cro4 or 25.0 ml of 0.080 m k3po4?

Alpha radiation: A. is not harmful as it is not able to penetrate human skin B. can be harmful to humans if the materials are inhaled, swallowed, or absorbed through open wounds C. can travel long distances through air D.

The symbol for hydronium ion concentration is

You are given an unknown gaseous binary compound. when 10.0g of the compound isburned in excess oxygen, 16.3g of water is produced. the compound has 1.38 times that of oxygen gas at the same conditions of temperature and pressure.

Given 4.80g of ammonium carbonate, find: Number of moles of the compound Number of moles of ammonium ions Number of moles of carbonate ions Number of moles of hydrogen atoms Number of hydrogen atoms

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