Complete the following for the molecules or ions below (see parts a, b, c below): SiH4 NH3 H2O CO2 SO2 CH2O CH4 BH3 PF5 XeF4 ClF3 XeF2 SF4 SF6 NO2- CO32- CN- I3- SF5- NH4+ a. Draw the Lewis Structure (be prepared to justify your Lewis structure and why you believe it is the correct structure, when you input your exam answers in the 40-minute exam answer submission file on blackboard. For instance, justification can be provided by showing/explaining formal charge calculations, as well as obeying octet rule and exceptions to octet rule, etc…) b. Identify the molecular geometry (shape) c. Identify the hybridization of the central atom d. State the bond angle for the following molecules or ions: H2O CO2 SO2 NH3 NH4 + CH4 BH3 e. Explain the difference between a sigma and pi bond. f. Identify the number of π bonds and σ bonds in the caffeine (C8H10N4O2) molecule below.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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