Answer the following question given this paragraph: Reduce, reuse, and recycle. There are steps that you personally can take to conserve our natural resources and reduce waste. The waste that an individual creates is small in proportion to all the waste produced by society. Yet all small contributions, when added up, make a difference. Q: What three rs represent the steps that you personally can take to conserve our natural resources and minimize waste? Choices: - rinse, reuse, recycle - remove, reduce, reuse - reduce, reuse, re-educate - reduce, reuse, recycle A:
reduce, reuse, recycle
(Question)
Answer the following question given this paragraph: Solubility may increase or decrease with temperature; the magnitude of this temperature dependence varies widely among compounds. Notice in particular the curves for NH4NO3 and CaCl2. The dissolution of ammonium nitrate in water is endothermic (Hsoln = +25.7 kJ/mol), whereas the dissolution of calcium chloride is exothermic (Hsoln = 68.2 kJ/mol), yet Figure 13.9 "Solubilities of Several Inorganic and Organic Solids in Water as a Function of Temperature" shows that the solubility of both compounds increases sharply with increasing temperature. In fact, the magnitudes of the changes in both enthalpy and entropy for dissolution are temperature dependent. Because the solubility of a compound is ultimately determined by relatively small differences between large numbers, there is generally no good way to predict how the solubility will vary with temperature. The variation of solubility with temperature has been measured for a wide range of compounds, and the results are published in many standard reference books. Chemists are often able to use this information to separate the components of a mixture byfractional crystallization, the separation of compounds on the basis of their solubilities in a given solvent. For example, if we have a mixture of 150 g of sodium acetate (CH3CO2Na) and 50 g of KBr, we can separate the two compounds by dissolving the mixture in 100 g of water at 80C and then cooling the solution slowly to 0C. According to the temperature curves in Figure 13.9 "Solubilities of Several Inorganic and Organic Solids in Water as a Function of Temperature", both compounds dissolve in water at 80C, and all 50 g of KBr remains in solution at 0C. Only about 36 g of CH3CO2Na are soluble in 100 g of water at 0C, however, so approximately 114 g (150 g 36 g) of Saylor URL: http://www. saylor. org/books. Q: The separation of compounds on the basis of their solubilities in a given solvent is known as what? Choices: - nuclei crystallization - simplest crystallization - separate crystallization - fractional crystallization A:
(Answer)
fractional crystallization
Ques: Answer the following question given this paragraph: The echinoderm nervous system has a nerve ring at the center and five radial nerves extending outward along the arms. There is no centralized nervous control. Echinoderms have separate sexes and release their gametes into the water where fertilization takes place. Echinoderms may also reproduce asexually through regeneration from body parts. Q: What process takes place when echinoderms release their gametes into the water? Choices: - migration - stimulation - isolation - fertilization A:
Ans: fertilization
(Q).
Answer the following question given this paragraph: Q: Composed largely of the polysaccharide chitin, the exoskeleton provides an effective barrier defense against most what? Choices: - parasites - white blood cells - vaccines - pathogens A:
(A).
pathogens
Ques:Answer the following question given this paragraph: Pangaea has been breaking apart since about 250 million years ago. Divergent plate boundaries formed within the continents to cause them to rift apart. The continents are still moving apart. The Pacific is shrinking as the Atlantic is growing. The Appalachians ( Figure below ) are now on a passive margin. The mighty mountains have weathered and eroded to what they are today. Q: How many millions of years ago did pangaea begin breaking apart? Choices: - 600 - 400 - 500 - 250 A:

Ans:250
Ques:Answer the following question given this paragraph: A sand dune has a gentle slope on the side the wind blows from. The opposite side has a steep slope. This side is called the slip face. Q: What is the term for the steep sloped side of a sand dune? Choices: - front face - break face - slide face - slip face A:

Ans:
slip face