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Chapter 1: QCYL (page 9)
Convert 80.92 掳C to K and 掳F.
The temperature 80.920C can be converted to 354.07 K and 177.7 掳F.
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The density (d) of a substance is an intensive property that is defined as the ratio of its mass(m) to its volume (V).
\(\begin{aligned}{\rm{density = }}\frac{{{\rm{mass}}}}{{{\rm{volume}}}}\\{\rm{d = }}\frac{{\rm{m}}}{{\rm{v}}}\end{aligned}\)
Considering that mass and volume are intensive properties, explain why their ratio, density is intensive.
Use scientific (exponential) notation to express the following quantities in terms of the SI base units in Table1.3:
(a) 0.13 g
(b) 232 Gg
(c) 5.23 pm
(d) 86.3 mg
(e) 37.6 cm
(f) 54 渭m
(g) 1 Ts
(h) 27 ps
(i) 0.15 mK
A large piece of jewelry has a mass of 132.6g. A graduated cylinder initially contains 48.6 mL water. When the jewellery is submerged in the graduated cylinder, the total volume increases to 61.2 mL.
a) Determine the density of this piece of jewelry.
b) Assuming that the jewellery is made from only one substance, what substance is it likely to be? Explain.
Perform the following calculations and report each answer with the correct number of significant figures.
(a) 62.8 脳 34
(b) 0.147 + 0.0066 + 0.012
(c) 38 脳 95 脳 1.792
(d) 15 鈥� 0.15 鈥� 0.6155
(e) 8.78 脳 (0.0500/ 0.478)
(f) 140 + 7.68 + 0.014
(g) 28.7 鈥� 0.0483
(h) (88.5 鈭� 87.57)/ 45.13
Toothpastes containing sodium hydrogen carbonate (sodium bicarbonate) and hydrogen peroxide are widely used. Write Lewis structures for the hydrogen carbonate ion and hydrogen peroxide molecule, with resonance forms where appropriate.
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