An engine is running by burning coal. Which statement is correct? A. The engine created energy to perform work. B. The coal created energy to operate the engine. C. The source of energy was created by the sun. D. The energy used to perform work can be traced back to the sun.

How to convert a density of 0.791g/cm3 to lb/ft3

22. a flask containing 450 ml of 0.50 m h2so4 was accidentally knocked to the floor. how many grams of nahco, do you need to put on the spill to neutralize the acid according to the following equation: h2so4(aq)+2 nahcos(aq) na,so(aq) +2 h20()+2 co2(g) d) 38 g a) 2.3 g b) 9.5 g c) 19 g

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?