How many moles of oxygen gas are required to form 55g of carbon monoxide gas

Is a pencil falling to the floor anon contact force, a force, or a contact force

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

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.