Answer the following question given this paragraph: Unsaturated hydrocarbons that contain one or more triple bonds are called alkynes . The names of specific alkynes always end in yne and have a prefix for the number of carbon atoms. The structural formula in the Figure below represents the smallest alkyne, named ethyne, which has two carbon atoms and two hydrogen atoms (C 2 H 2 ). Ethyne is also called acetylene. It is burned in acetylene torches, like the one pictured in the Figure below . The flame of an acetylene torch is so hot that it can melt metal. Q: Alkynes are what type of compound? Choices: - reversible hydrocarbons - proteins hydrocarbons - Split Hydrocarbons - unsaturated hydrocarbons A:
unsaturated hydrocarbons
(Question)
Answer the following question given this paragraph: General Cnidarian Life Cycle. Cnidarians may reproduce both asexually and sexually. Q: What are two ways cnidarians are able to reproduce? Choices: - mitosis and meiosis - spawning and sexual - internally and externally - asexually and sexually A:
(Answer)
asexually and sexually
Ques: Answer the following question given this paragraph: A: Air in the atmosphere is a gaseous solution. It is a mixture that contains mainly nitrogen and oxygen gases, with very small amounts of several other gases. The circle graph in the Figure below shows the composition of air. Because air is a solution, it is homogeneous. In other words, no matter where you go, the air always contains the same proportion of gases that are shown in the graph. Q: Which two gases make up the bulk of earth's atmosphere? Choices: - carbon and oxygen - phosphorus and oxygen - nitrogen and argon - nitrogen and oxygen A:
Ans: nitrogen and oxygen
(Q).
Answer the following question given this paragraph: In our calculation, we have ignored the reaction of the weakly basic anion with water, which tends to make the actual solubility of many salts greater than the calculated value. Exercise One crystalline form of calcium carbonate (CaCO3) is the mineral sold as "calcite" in mineral and gem shops. The solubility of calcite in water is 0.67 mg/100 mL. Calculate its Ksp. Answer: 4.5 109. Q: One crystalline form of calcium carbonate is the mineral sold as what? Choices: - quartz - basalt - salt - calcite A:
(A).
calcite
Ques:Answer the following question given this paragraph: Vitamins are organic compounds that the body needs in small amounts to function properly. Humans need 13 different vitamins. Some of them are listed below ( Table below ). The table also shows how much of each vitamin you need every day. Vitamins have many roles in the body. For example, Vitamin A helps maintain good vision. Vitamin B 9 helps form red blood cells. Vitamin K is needed for blood to clot when you have a cut or other wound. Q: What are the organic compounds that the body needs in small amounts to function properly; humans need 13 different ones? Choices: - minerals - proteins - nutrients - vitamins A:

Ans:vitamins
Ques: Answer the following question given this paragraph: Occurrence, Preparation, and Compounds of Boron and Silicon Boron constitutes less than 0.001% by weight of the earth's crust. In nature, it only occurs in compounds with oxygen. Boron is widely distributed in volcanic regions as boric acid, B(OH)3, and in dry lake regions, including the desert areas of California, as borates and salts of boron oxyacids, such as borax, Na2B4O710H2O. Elemental boron is chemically inert at room temperature, reacting with only fluorine and oxygen to form boron trifluoride, BF3, and boric oxide, B2O3, respectively. At higher temperatures, boron reacts with all nonmetals, except tellurium and the noble gases, and with nearly all metals; it oxidizes to B2O3 when heated with concentrated nitric or sulfuric acid. Boron does not react with nonoxidizing acids. Many boron compounds react readily with water to give boric acid, B(OH)3 (sometimes written as H3BO3). Reduction of boric oxide with magnesium powder forms boron (9598.5% pure) as a brown, amorphous powder: B 2 O 3(s) + 3Mg(s) 2B(s) + 3MgO(s) An amorphous substance is a material that appears to be a solid, but does not have a long-range order like a true solid. Treatment with hydrochloric acid removes the magnesium oxide. Further purification of the boron begins with conversion of the impure boron into boron trichloride. The next step is to heat a mixture of boron trichloride and hydrogen: 1500 C. Q: Boron only occurs naturally in compounds with what element? Choices: - helium - nitrogen - carbon - oxygen A:
Ans:
oxygen