Which is a form of heat transfer that is reduced by using a potholder when taking a hot dish out of an oven? Please answer quickly, it's a test.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled