Madison's group lab is given a dish that contains sand, shells and water. How should they classify the substance they have been given? A: The solution is a homogenous mixture because it has the same uniform appearance and composition throughout
B: The solution is a heterozygous mixture because it does not have the same uniform appearance or composition.
C: The substance is a compound because it contains several elements.
D: The substance is a pure substance because it's made up of various compounds.

answer; ////increased water pollution; ///////////////////////

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate