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Chapter 2: Q43P (page 40)
Write thenotation for each atomic depiction
(a)
(b) 
(c)
In an element A represents the mass number and while Z represents atomic number of an element.
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Which separation method is operating in each of the following procedures: (a) pouring a mixture of cooked pasta and boiling water into a colander; (b) removing colored impurities from raw sugar to make refined sugar; (c) preparing coffee by pouring hot water through ground coffee beans?
Each scene below represents a mixture. Describe each one in terms of the number of elements and/or compounds present.
Give the name and formula of the compound whose molecules consist of two sulfur atoms and four fluorine atoms.
Hydroxyapatite, Ca5(PO4)3(OH), is the main mineral component of dental enamel, dentin, and bone, and thus has many medical uses. Coating it on metallic implants (such as titanium alloys and stainless steels) helps the body accept the implant. In the form of powder and beads, it is used to fill bone voids, which encourages natural bone to grow into the void. Hydroxyapatite is prepared by adding aqueous phosphoric acid to a dilute slurry of calcium hydroxide. (a) Write a balanced equation for this preparation. (b) What mass of hydroxyapatite could form from 100 g of 85% phosphoric acid and 100. g of calcium hydroxide?
Describe Thomson鈥檚 model of the atom. How might it account for the production of cathode rays?
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