Astudent placed 3.0 grams of mg into some hcl in two different experiments. in each case, it reacted according to the following equation:
mg(s) + 2hcl(aq) → mgcl2(aq) + h2(g).
in the first experiment, it took 32 minutes for all of the mg to react. in the second experiment, it took 54 minutes for all of the mg to react. which of the following could account for the change in reaction rate of the second experiment?
a catalyst was added
the mg was powdered into h2
the h2 was decreased
the temperature was decreased

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

What material does not melt at any temperature

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.