Which number contains four significant figures? a) 3.978 b) 0.780 c) 0.0085 d) 1700 e) two or more of the above numbers contain four significant figures

Which of the following units is not an official si unit

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

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