When aluminum, al, metal is dipped in an aqueous solution of hydrochloric acid, hcl, hydrogen gas, h2, is produced with the formation of an aluminum chloride, alcl3, solution. write the balanced chemical equation showing the phases of reactants and products

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .