Chemistry (OER)
19th Edition
ISBN: 9781947172623
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 10, Problem 27E
The surface tension and viscosity of water at several different temperatures are given in this table.
Water | Surface Tension (mN/m) | Viscosity (mPa s) |
0 °C | 75.6 | 1.79 |
20 °C | 72.8 | 1.00 |
60 °C | 66.2 | 0.47 |
100 °C | 58.9 | 0.28 |
(a) As temperature increases, what happens to the surface tension of water? Explain why this occurs, in terms of molecular interactions and the effect of changing temperature.
(b) As temperature increases, what happens to the viscosity of water? Explain why this occurs, in terms of molecular interactions and the effect of changing temperature.
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The surface tension and viscosity of water at several different temperatures are given in
this table.
Water
Surface Tension (mN/m)
Viscosity (mPa s)
0 °C
75.6
1.79
20 °C
72.8
1.00
60 °C
66.2
0.47
100 °C
58.9
0.28
As temperature increases, what happens to the surface tension of water? Explain
why this occurs, in terms of molecular interactions and the effect of changing
temperature.
а.
The vapor pressure of water changes with
temperature, as shown here.
T (°C) P (torr)
21
18.7
22
19.8
23
21.1
24
22.4
25
23.8
25.2
26.7
28.4
30.0
31.8
26
27
28
29
30
A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen
and oxygen gases. When electrical current of unknown magnitude is run through the device for 1.50 min, 13.8 mL of water-
saturated H₂(g) is collected. The temperature and pressure of the system are 25 °C and 715 torr.
Part A
How many moles of hydrogen gas are produced?
Express your answer to three significant figures and include the appropriate units.
► View Available Hint(s)
μA
Value
Units
part B 6
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