Define an exothermic reaction. Give an example
An exothermic reaction is one that gives off heat. The combustion of methane (NH4)
is an example.
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The spectra of the youngest stars show the most heavy elements present
Indicate whether the statement is true or false
You could use two parallel wires to move objects 1 and 2 apart if each wire is embedded in its own object and if 
A. one wire carries a current and the other wire has zero current. B. the currents in the wires are in the same direction. C. the currents in the wires are in opposite directions.
Comet nuclei can be darker than charcoal
Indicate whether the statement is true or false
Compared to today, in the future, the Sun's habitable zone will be
A) wider and closer to the Sun B) narrower and closer to the Sun C) narrower and farther from the Sun D) wider and farther from the Sun