Beginning around 1950, human activity led to an increase in CO2 emissions. Use data from the graph to support an explanation of how CO2 affects Earth’s ability to absorb and release energy from the Sun.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver