Questions and Answers of General Chemistry Principles

Two students each made four measurements of the mass of an object. Their results are shown in the table below. The exact mass of the object is 51.0 g. Whose results are more precise, Student A’s
The density of silver is 10.5 g/mL. What is the volume of 475 g of silver? (a) 475 / 10.5; (b) 10.5 / 475; (c) 1/[10.5 x 475]; (d) 475 x 10.5; (e) None of these
The density of water is 0.9982 g/cm3 at 20 °C. Express the density of water at 20 °C in the following units: (a) g/L; (b) kg/m3; (c) kg/km3.
The reported value for the volume of a rectangular piece of cardboard with the dimensions 36 cm x 20.2 cm x 9 mm should be(a) 6.5 x 103 cm3;(b) 7 x 102 cm3; (c) 655 cm3; (d) 6.5 x 102 cm3.
List the following in the order of increasing precision, indicating any quantities about which the precision is uncertain: (a) 1400 km; (b) 1516 kg; (c) 0.00304 g; (d) 125.34 cm; (e) 2000 mg.
Without doing detailed calculations, explain which of the following objects contains the greatest mass of the element iron. (a) A 1.00 kg pile of pure iron filings. (b) A cube of wrought iron, 5.0
A lump of pure copper weighs 25.305 g in air and 22.486 g when submerged in water (d = 0.9982 g/mL) at 20.0 °C. Suppose the copper is then rolled into a 248 cm2 foil of uniform thickness. What
Water, a compound, is a substance. Is there any circumstance under which a sample of pure water can exist as a heterogeneous mixture? Explain.
In the production of ammonia, the following processes occur. (a) Air is liquefied at low temperature and high pressure. (b) The temperature of the liquid air is raised gradually until the oxygen

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