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periodic table elements test #2 chemistry

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CHEMISTRY

The composition of a coal is determined by a proximate analysis. The coal is first finely ground and air-dried. Samples of the dried coal are then subjected to several operations, with the sample weights being recorded before and after each operation. Moisture content is determined as the weight loss when a sample is held at $105^{\circ} \mathrm{C}$ in an oxygen-free atmosphere for roughly 2 h, added to the weight loss in the initial drying step. Volatile matter (primarily organic tars) is determined by holding a sample at $925^{\circ} \mathrm{C}$ in an oxygen-free atmosphere for 7 min and subtracting the moisture loss from the total weight loss. Ash (or mineral matter—oxides and sulfates of silicon, aluminum, iron, calcium, sulfur, and trace minerals) is the residue that remains after a sample has been heated to $800^{\circ} \mathrm{C}$ in an oxygen-containing atmosphere until all the organic matter has been burned away. Fixed carbon is what is present in coal besides moisture, volatile matter, and ash. a) Use the following proximate analysis data to determine the percentages by mass of moisture, fixed carbon, volatile matter, and ash in a coal: $1.207 \mathrm{g} \frac{\text { air-dry }}{25^{\circ} \mathrm{C}, 12 \mathrm{h}} 1.147 \mathrm{g}$ The remaining tests are performed on air-dried samples. $1.234 \mathrm{g} \frac{105^{\circ} \mathrm{C}, \mathrm{N}_{2}}{2 \mathrm{h}} 1.204 \mathrm{g}$ $1.347 \mathrm{g} \frac{925^{\circ} \mathrm{C}, \mathrm{N}_{2}}{7 \mathrm{min}} 0.811 \mathrm{g}$ $1.175 \mathrm{g} \frac{800^{\circ} \mathrm{C}, \mathrm{O}_{2}}{1 \mathrm{h}} 0.111 \mathrm{g}$ b) If the mass ratio of C to H in the volatile matter is 6:1, calculate the gram-moles of air theoretically required to burn 1 metric ton of this coal.

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PHYSICAL SCIENCE

One kilogram-meter per second squared is also equal to what unit?

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PHYSICAL SCIENCE

If the temperature in a citrus orchard drops below -2$^{\circ}$C for several hours, the fruit will freeze and be destroyed. Citrus growers spray tiny droplets of water to protect the crop if a freeze is predicted. Protection comes from the heat released as the heated water cools. However, much of the heat that protects trees from freezing is released as the water freezes. Based on the energy changes that occur when materials change state, determine how water freezing on the fruit can protect it from becoming too cold.

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PHYSICAL SCIENCE

What is the IUPAC systematic name for the compound KF?

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periodic table elements test #2 chemistry

Terms in this set (57)

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