A) co2 is non polar while h2o is polar why?
b) why pcl5 is very reactive?
c) h2o is a liquid h2s is a gas. why?

it is a 3 mark question so (a) carries 1 mark, (b)carries 1 and (c)carries 1 mark
following this method and post the question

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.

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.