Which two pieces of evidence support the conclusion that the total amount of energy in a closed system remains the same? The car's engine makes sounds as it runs.

The car remains full of gasoline if its engine stays off.

The car's engine gets hot as it burns gasoline.

The car uses more gasoline as it goes faster.

Which is true of the reactants in this displacement reaction? fe + 2hcl fecl2 + h2 a. the reactants are located to the left of the arrow in the chemical equation. b. the reactants contain 1 iron atom, 2 hydrogen atoms, and 1 chlorine atom. c. the reactants are the atoms, molecules, or compounds formed in the reaction. d. the reactants have the same physical and chemical properties as the products.

What happens to the atomic radius when an elctron is lost

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?