Chapter 1: Question 67 E (page 9)
Meat can be classified as fresh (not frozen) even though it is stored at −1 °C. Why wouldn’t meat freeze at this temperature?
The ions and compounds present in the meat water lower the freezing point of the beef below –1 °C.
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Matter is everywhere around us. Make a list by name of fifteen different kinds of matter that you encounter every day. Your list should include (and label at least one example of each) the following: a solid, a liquid, a gas, an element, a compound, a homogenous mixture, a heterogeneous mixture, and a pure substance.
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
Convert the boiling temperature of liquid ammonia, \( - 28.1^\circ F,\) into degrees Celsius and kelvin.
Perform the following calculations and report each answer with the correct number of significant figures.
(a) 628 × 342
(b) (5.63 ×102) × (7.4 ×103)
(c) 28.0/ 13.483
(d) 8119 × 0.000023
(e) 14.98 + 27,340 + 84.7593
(f) 42.7 + 0.259
Which molecule has a molecular mass of 28.05 amu?
(a) \({\rm{HC}} \equiv {\rm{CH}}\)
(b)
(c)
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