1) If you transfer energy into two solid substances, which do you think would melt first: a substance with stronger molecular attraction or a substance with weaker molecular attraction? 2) If you transfer energy out of two substances in the gas phase, which do you think would condense first: a substance with stronger molecular attraction or a substance with weaker molecular attraction?

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Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus