Chapter 1: Q31 E (page 57)
Explain the difference between extensive properties and intensive properties.
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The volume of a sample of oxygen gas changed from 10 mL to 11 mL as the temperature changed. Is this a chemical or physical change?
A long ton is defined as exactly 2240 lb. What is this mass in kilograms?
How much heat is produced when 100 mL of 0.250 M HCl (density, 1.00 g/mL) and 200 mL of 0.150 M NaOH (density, 1.00 g/mL) are mixed?
\({\bf{HCl(aq) + NaOH(aq)}} \to {\bf{NaCl(aq) + }}{{\bf{H}}_{\bf{2}}}{\bf{O(l) \Delta H}}_{{\bf{298}}}^{\bf{^\circ }}{\bf{ = - 58kJ}}\)
If both solutions are at the same temperature and the heat capacity of the products is 4.19 J/g °C, how much will the temperature increase? What assumption did you make in your calculation?
Calculate these volumes.
a) What is the volume of 25g of iodine, density = 4.93 g/cm3?
b) What is the volume of 3.28 g gaseous hydrogen, density = 0.089 g/L?
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
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