Which best describes global CO2 emissions? A. Humans have reduced the amount of CO2 in the atmosphere. B. The amount of CO2 released by humans has increased over the last 200 years. C. There are no fuels that release CO2 when burned. D. Humans have stopped releasing CO2 into the atmosphere.

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.