Download Chemistry Demystified: A Self-Teaching Guide by Linda Williams PDF

By Linda Williams

Textual content presents a self-teaching consultant for these with out previous formal education in chemistry. Covers the elements of topic; symbols and naming criteria utilized in chemistry; components, electrons, and the Periodic desk; the composition of atoms; and solubility, boiling, and freezing issues. Softcover.

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Estimate the lifetime of the equipment in terms of months. The fireplace should be usable for ten years, or 120 months. When you buy the fireplace, ask the store for a number and then multiply this amount by about 80 percent to account for generosity. ) Another way you can estimate this figure is to simply use the lifetime of the equipment you’re replacing as a basis. If you’re replacing a 10-year-old fireplace, use 10 years for the estimated cost of the one you’re selling. 5. Divide the net cost by the lifetime of the equipment to calculate the monthly depreciation.

Divvy up the costs. Servicing for equipment should likewise be allocated (by month) according to the use of that equipment. For example, if you service your heater in July for $240, it only makes sense to assign that $240 to those months when you use heat. If you service only once every three years, allocate the costs accordingly. Once again, don’t worry if you’re not perfect. Just do the best you can and you’ll see that it’s good enough. 21 22 Part I: Playing the Energy Game For large equipment expenditures, accountants use a term called depreciation.

To find out how much an appliance costs per month to run, first estimate how much time it’s on per day. Then use this formula: Wattage ÷ 1,000 × hrs/day × $/kWh ÷ 30days/month = total cost per month A clothes dryer uses 5,570 watts. 86 hours per day. 40 per month. 56 per month in cash and about 1,748 of carbon dioxide emissions per year. Plus, your clothes smell better. You may also want to consider that all that dryer heat eventually goes out the vent pipe to the great outdoors, which seems like such a waste.

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