In this unit, we learned about almost everything under the sun that relates to atoms, atomic bonding, and reactions. We began by learning about significant figures, which are a sidenote of sorts but still important when doing math in Chemistry. From there we touched on the periodic table, discussing its groups and their properties and the patterns that cause the table to look how it does today. By learning the groups, we acquired knowledge of what elements are quick to bond and which are not, and how violently some react with other substances (such as the elements in Group 1A in water). For a brief while we discussed what atoms are made up of, constantly reminding ourselves that atomic numbers are equal to the numbers of protons. Our plethora of lessons helped us learn about bonds, what keeps atoms together, and how things like electrons are found (their arrangement) in atoms.
Problems:
4.) Describe nuclear fission and nuclear fusion. While nuclear fusion implies that two nuclei are joined together in a display of heat and energy to create a new, bigger nucleus and a new element, nuclear fission requires one nucleus to be split apart into two smaller nuclei. The two products are usually of the same element, but are different from the atom that was split apart. Fission also requires generous amounts of heat and energy to occur.
7.) What are cations and anions? They are the positively and negatively charged atoms in a compound. Typically, their charges are balanced to come out with something neutral. The cations are positive, while the anions are negative (remember that nifty trick I mentioned a few posts back? No? Oh well...)
11.) A substance does not dissolve in water and does not conduct electricity. What kind of bond keeps it together? It is most likely bonded with network covalence.
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