Unformatted text preview: ach or the following molecular substances. (a) NF3 (b) dinitrogen tetroxide (c) hydrogen cyanide (d) SF6 (e) IF5 (f) XeO3 (g)tertaphosphorous hexasulfide 70. The oxides of nitrogen are often present in urban air pollution. Name each of the following oxides of nitrogen. (a) N2O (b) NO (c) NO2 (d) N2O5 (e) N2O4 71. Write the formula for each of the following substances. (a) zinc carbonate can be heated to from zinc oxide and carbon dioxide (b) On treatment with hydrofluoric acid, silicon dioxide forms silicon tetrafluoride and water (c) Sulfur dioxide reacts with water to form sulfurous acid (d) The substance hydrogen phosphide, also known as phosphine, is a toxic gas. (e) Perchloric reacts with cadmium to from cadmium perchlorate (f) vanadium(III)bromide is a colored solid. 72. The nucleus of a potassium atom has a diameter on the order of 1 x 10‐5nm. A potassium atom has a diameter of approximately 0.5nm. In terms of volume, how many times larger is the potassium atom than the potassium nucleus? 73. The element oxygen has three naturally occurring isotopes: oxygen‐16, oxygen‐17 and oxygen‐
18. Discuss the similarities and differences between these three types of atoms. 74. Consider the elements Ar, H, Ga, Al, Ca, Br, Ge, K and O. Pick the one that best fits each of the following descriptions. (a) an alkali metal (b) an alkaline earth metal (c) a noble gas (d) a halogen (e) a metalloid (f) a nonmetal listed in group 1 (g) a metal that forms a +3 ion (h) an element that resembles aluminum 75. The compound Fe3S4 is magnetic. It is found in bacteria, which may use this magnetic property to help them be oriented in earth’s magnetic field. If the sulfur charge is 2+, the Fe charge is not an integer. How can you explain this? (hint think of this mineral as a mixture of two different iron/sulfur compounds.) 76. Give the chemical names for each of the following common compounds. (a) NaCl (table salt) (b) NaHCO3(baking soda) (c) NaOCl (Bleach) (d) NaOH(lye) (e) (NH4)2CO3(smelling salts) (f) CaSO4(plaster of Paris) (g) Mg(OH)2(Milk of Magnesia) (h) CaO (Lime) (i) HCl (muric acid) 77. Many ions and compounds have very similar names and there is a great potential for confusion. Write the correct chemical formulas to distinguish between each of the following pairs of chemicals. (a) calcium sulfide and calcium hydrogen sulfide (b) hydrobromic acid and bromic acid (c) aluminum nitride and aluminum nitrate (d) ammonia and ammonium ion (e) iron(II)oxide and Iron(III)oxide (f) potassium sulfate and potassium thiosulfate (g) magnesium chloride and manganese(II)chloride 78. The periodic table is ordered by increasing atomic number. As such, it is possible for elements to be out of order based on atomic mass. In fact, there are six pairs of elements that are out of order based on atomic mass. Find and list the six pairs. 79. Calculate the percent oxygen by mass and the percent hydrogen by mass of each of the following compounds or ions. (a)H2O (b)H2O2 (c) OH2 (d)H3O+ 80. For the reaction 2H2(g) + O2(g) 2H2O(g), give a complete list of the bonds that are broken and the bonds that are formed as the reactants are converted to products....
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This document was uploaded on 09/19/2013.
- Fall '13
- AP Chemistry