Heat flows from warmer temperature objects to cooler temperature objects because heat it defined as what?

During chemistry class, carl performed several lab tests on two white solids. the results of three tests are seen in the data table. based on this data, carl has concluded that substance b must have bonds.

Use the measurements in the table to determine which unidentified metal has the highest density. metal volume mass a 10.5 cm3 122 g b 14.2 cm3 132 g c 16.1 cm3 115 g d 12.7 cm3 126 g

Silver reacts with oxygen to produce silver oxide. (write balanced chemical equation and identify type of chemical reaction.)