Ibeg you i realy need when the characteristics or state (solid, liquid or gas) of a substance change but the chemical composition does not change that is an indication of: a physical change a chemical change a global change no change which of the following is an extensive physical property of matter? volume viscosity odor density the percentage by mass of elements in a particular pure substance will vary from sample to sample. true false classify each of the following as an element, compound, or mixture. mixture compound element answer a. propane gas b. soil (dirt) c. solid gold coin

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Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.