Pesticides physical properties or chemical properties

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate