07. what is the velocity of a 500kg elevator that has 4000j of energy?
1) givens & unknown:
2) formula:
3) sub & solve:

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

What is the value of the standard enthalpy of formation of an element in its most stable form?

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.