Which phrase best describes a point source of air pollution? a. smokestack releasing dioxins from a plastics factory b. fertilized lawns causing nutrient runoff into a river c. pipes releasing wastewater from an industrial area d. automobiles releasing sulfur dioxide throughout a city

Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2al(s)+3cl2(g)→2alcl3(s) what is the maximum mass of aluminum chloride that can be formed when reacting 32.0 g of aluminum with 37.0 g of chlorine? express your answer to three significant figures and include the appropriate units.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .