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Chapter 1: Q15E (page 55)
Many of the items you purchase are mixtures of pure compounds. Select three of these commercial products and prepare a list of the ingredients that are pure compounds.
The three commercial products, LPG, CNG, and hand sanitizer, are mixtures of pure compounds.
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Identify the following properties as either extensive or intensive
Indicate whether each of the following can be determined exactly or must be measured with some degree of uncertainty:(a) the number of seconds in an hour(b) the number of pages in this book(c) the number of grams in your weight(d) the number of grams in 3 kilograms(e) the volume of water you drink in one day(f) the distance from San Francisco to Kansas City
Question: Solve these problems about lumber dimensions.
a) TO describe to a European how houses are constructed in the US, the dimensions of 鈥淭wo-by-four鈥� lumber must be converted into metric units. The thickness 脳 width 脳 length dimensions are 1.50 in. 脳 3.50 in. 脳 8.00 ft in the US. What are the dimensions in cm 脳 cm 脳 m?
b) This lumber can be used as vertical studs, which are typically placed 16.0 in. Apart. What is that distance in centimetres?
As stated in the text, convincing examples that demonstrate the law of conservation of matter outside of the laboratory are few and far between. Indicate whether the mass would increase, decrease, or stay the same for the following scenarios where chemical reactions take place:
(a) Exactly one pound of bread dough is placed in a baking tin. The dough is cooked in an oven at 350 掳F releasing a wonderful aroma of freshly baked bread during the cooking process. Is the mass of the baked loaf less than, greater than, or the same as the one pound of original dough? Explain.
(b) When magnesium burns in air a white flaky ash of magnesium oxide is produced. Is the mass of magnesium oxide less than, greater than, or the same as the original piece of magnesium? Explain.
(c) Antoine Lavoisier, the French scientist credited with first stating the law of conservation of matter, heated a mixture of tin and air in a sealed flask to produce tin oxide. Did the mass of the sealed flask and contents decrease, increase, or remain the same after the heating?
Hydrogen gas, H2, reacts explosively with gaseous chlorine, \({\bf{C}}{{\bf{l}}_{\bf{2}}}\), to form hydrogen chloride, HCl(g). What is the enthalpy change for the reaction of 1 mole of \({{\bf{H}}_{\bf{2}}}\)(g) with 1 mole of \({\bf{C}}{{\bf{l}}_{\bf{2}}}\)(g) if both the reactants and products are at standard state conditions? The standard enthalpy of formation of HCl(g) is 鈭�92.3 kJ/mol.
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