23) All of the following contain silicates in various forms except A. 22) Which of the following concentrated acids can be safely transported in passivated lead containers?Ĭ. Diamond is an excellent conductor of heat. Graphite is an electrically conducting solid. carbon to another through a delocalized π-network formed by the overlap of unhybridized porbitals. Graphite consists of planar sheets of sp2-hybridized carbon atoms and electrons can move from one C. C60 is molecular and thus soluble in solvents like benzene. In diamond, each carbon atom is sp3-hybridized and linked to its four neighbors, with all electrons in C-C σ-bonds.ī. 21) Which of the following is not true? A. 1 bridging hydrogen, 4 terminal hydrogens, and an ionic hydrogen. 6 terminal hydrogens and 1 boron-boron bond. 4 bridging hydrogens and 2 terminal hydrogens. 2 bridging hydrogens and 4 terminal hydrogens. 19) The role of magnesium in chlorophyll is A. electrolysis of brine containing Al2(SO4)3. treatment of Al2O3 with sodium hydroxide. electrolysis of a molten mixture of alumina, Al2O3, and cryolite, Na3AlF6. E.ġ7) What is the formula of baking soda? A. Li has a small radius.ġ6) What is the formula of quicklime? A. Lithium has the most negative standard potential of all the elements. SiO2(s) 15) What property of lithium makes the lithium-ion battery an excellent energy storage device? + A. CN 4−ġ3) Which of the following compounds is predicted to have bonds with the most covalent character? A.ġ4) Which of the following is an acidic oxide? A. (I) silicones (II) mica (III) zirconġ2) Which of the following species is both a base and a famous poison? A. Used as a substitute for diamond in costume jewelry. Ethane, ethene, ethyne 11) Identify which compound best fits each of the following descriptions: I. I and IIIġ0) Which of the following are different allotropes of carbon? A. Both conduct electricity.īoth do not conduct electricity. II.īoth have structures consisting of flat planes of hexagons. 9) What do graphite and boron nitride have in common? I. It is not far from the metalloids in the periodic table, and it does have some amphoteric properties. Aluminum does not support a reduction reaction. 8) Aluminum is very easily oxidized to Al3+, yet it is corrosion resistant. Magnesium is not the "doorway to life" in any way. It is the cation in the bones of our skeletons, the shells of shellfish, and the concrete, mortar, and B. It is present in every chlorophyll molecule and hence enables photosynthesis to take place. 7) In what way is magnesium the doorway to life? A. What will happen to the water as the reaction proceeds? A. 6) When NaH is added to water, hydrogen gas is produced. It has the greatest atomic mass among the elements listed above. It has the lowest first ionization energy among the elements listed above. It has the lowest electronegativity among the elements listed above. It has the largest atomic radius among the elements listed above. H2O2 5) Why does rubidium react much more vigorously with oxygen than lithium, sodium and potassium do? A. Magnesium metal reacts with hydrochloric acid to produce the same explosive gas. I, II, III, IV and VIIĤ) Lithium hydride reacts with water to produce an explosive gas. Water is the only combustion product of hydrogen. Most of the Earth’s hydrogen is present as hydrocarbons. Most of the Earth’s hydrogen is present as water. Most of the Earth’s hydrogen is present as H2 molecules. Hydrogen is the most abundant element in the human body. Hydrogen is the most abundant element on Earth. Hydrogen is the most abundant element in the universe. II and IIIģ) Which of the following statements are true? I. They can display the inert-pair effect and have an oxidation number 2 more than their group number suggests. Elements at the foot of the s-block also have variable valence. Elements in Period 3 and higher periods have access to empty p-orbitals and can use them to expand their valence shells past the usual octet of electrons. Elements in Period 3 and higher periods can reach higher oxidation states and have higher valences. We can usually predict the valence of an element in Period 2 from the number of electrons in the valence shell and the octet rule. Cl > Br > I 2) Which of the following statements are true? I. CH302 Quiz 6 Prep-Main Group I-IV Properties and Reactivity 1) Which of the following groups of atoms is correctly arranged in order of decreasing first ionization energy? A.
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