A) A metal forms a + charged ion, so D2+
B) A nonmetal forms a - charged ion, so A-
C) C2-
D) B+
Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.
True. If we all work together to conserve our resources, then the earth will be able to sustain its human population. In this century, many people don't really care about conserving resources because they are too careless to think about how much resources we are wasting on a daily basis. If everyone realizes how much resources we are wasting and helps to conserve them, than earth will have sufficient resources to sustain its human population.
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The purpose of a presumptive test is to see which substance the sample is.
