Which is an accurate description of what occurs when a log burns?
a) energy is created as the log burns
b) the compounds that make up the log are converted into fire, heat, and energy.
c) energy is released into the atmosphere as the log burns and disappears as it rises. d) the molecules present in the log are transformed into molecules that contain less energy than the original molecules. the energy difference is the heat of the fire.

Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2al(s)+3cl2(g)→2alcl3(s) what is the maximum mass of aluminum chloride that can be formed when reacting 32.0 g of aluminum with 37.0 g of chlorine? express your answer to three significant figures and include the appropriate units.

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon