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Chapter 1: QCYL (page 9)
Convert 80.92 掳C to K and 掳F.
The temperature 80.920C can be converted to 354.07 K and 177.7 掳F.
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The following quantities were reported on the labels of commercial products. Determine the number of significant figures in each.
(a) 0.0055 g active ingredients
(b) 12 tablets
(c) 3% hydrogen peroxide
(d) 5.5 ounces
(e) 473 mL
(f) 1.75% bismuth
(g) 0.001% phosphoric acid
(h) 99.80% inert ingredients
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?
Explain how you could experimentally determine whether the outside temperature is higher or lower than 0 掳C (32 掳F) without using a thermometer.
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?
What is the density of a liquid with a mass of 31.1415 g and a volume of 30.13 cm鲁?
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