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Chapter 1: Q29E (page 56)
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?
Physical change.
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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.
Most barium compounds are very poisonous; however, barium sulfate is often administered internally as an aid in the X-ray examination of the lower intestinal tract (Figure 15.4). This use of \(BaS{O_4}\) is possible because of its low solubility. Calculate the molar solubility of \(BaS{O_4}\)and the mass of barium present in \(1.00\;L\)of water saturated with\(BaS{O_4}\).
How do molecules of elements and molecules of compounds differ? In what ways are they similar?
Round off each of the following numbers to two significant figures:
(a) 517
(b) 86.3
(c) 6.382 脳103
(d) 5.0008
(e) 22.497
(f) 0.885
Express each of the following numbers in scientific notation with correct significant figures:
(a) 711.0
(b) 0.239
(c) 90743
(d) 134.2
(e) 0.05499
(f) 10000.0
(g) 0.000000738592
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