Chapter 2: Q58E (page 127)
Each of the following compounds contains a metal that can exhibit more than one ionic charge. Name these compounds:
a. NiCO3
b. MoO3
c.Co(NO3)2
d. V2O5
e. MnO2
f. Fe2O3
a. Nickel Carbonate
b. Molybdenum trioxide
c. Cobalt nitrate
d. Vanadium (V) oxide
e. Manganese (IV) oxide
f. Iron (III) oxide
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Click on the site (http://openstaxcollege.org/l/16PhetAtomMass) and select the โMix Isotopesโ tab, hide the โPercent Compositionโ and โAverage Atomic Massโ boxes, and then select the element boron.
(a) Write the symbols of the isotopes of boron that are shown as naturally occurring in significant amounts.
(b) Predict the relative amounts (percentages) of these boron isotopes found in nature. Explain the reasoning behind your choice.
(c) Add isotopes to the black box to make a mixture that matches your prediction in (b). You may drag isotopes fromtheir bins or click on โMoreโ and then move the sliders to the appropriate amounts.
(d) Reveal the โPercent Compositionโ and โAverage Atomic Massโ boxes. How well does your mixture match withyour prediction? If necessary, adjust the isotope amounts to match your prediction.
(e) Select โNatureโsโ mix of isotopes and compare it to your prediction. How well does your prediction comparewith the naturally occurring mixture? Explain. If necessary, adjust your amounts to make them match โNatureโsโamounts as closely as possible.
Predict and test the behavior of ฮฑ particles fired at a โplum puddingโ model atom.
(a) Predict the paths taken by ฮฑ particles that are fired at atoms with a Thomsonโs plum pudding model structure. Explain why you expect the ฮฑ particles to take these paths.
(b) If ฮฑ particles of higher energy than those in (a) are fired at plum pudding atoms, predict how their paths will differ from the lower-energy ฮฑ particle paths. Explain your reasoning.
(c) Now test your predictions from (a) and (b). Open the Rutherford Scattering simulation (http://openstaxcollege.org/l/16PhetScatter) and select the โPlum Pudding Atomโ tab. Set โAlpha Particles Energyโ to โmin,โ and select โshow traces.โ Click on the gun to start firing ฮฑ particles. Does this match your prediction from (a)? If not, explain why the actual path would be that shown in the simulation. Hit the pause button, or โReset All.โ Set โAlpha Particles Energyโ to โmax,โ and start firing ฮฑ particles. Does this match your prediction from (b)? If not, explain the effect of increased energy on the actual paths as shown in the simulation.
In the following drawing, the green spheres represent atoms of a certain element. The purple spheres represent atoms of another element. If the spheres touch, they are part of a single unit of a compound. Does the following chemical change represented by these symbols violate any of the ideas of Daltonโs atomic Theory? If so, which one?
Determine the empirical formulas for the following compounds.
a. acetic acid, C2H4O2
b. citric acid, C6H8O7
c. hydrazine, N2H4
d. nicotine, C10H14N2
e. butane, C4H10
An ion of platinum has a mass number of 195 and contains 74 electrons. How many protons and neutrons does it contain and what is itโs charge ?
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