Why is burning a log an exothermic process? a. energy must be continuously added to complete the combustion reaction. b. the log and oxygen contain more chemical energy than the gases and ash produced. c. additional energy is required to start the chemical reaction.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?