a) 5.08 (zeros between nonzero digits are significant)
b) 508 (zeros between nonzero digits are significant)
c) 5.080x103 (zeros between nonzero digits are significant; terminal zeros
to the right of the decimal point are significant)
d) 0.05080 (le
2.13 In ordinary chemical reactions (i.e., those that do not involve nuclear
transformations), mass is conserved and the law of mass conservation is still
Scene B illustrates the law of multiple proportions for compounds of
chlorine and oxyge
Compound 1: = 3.46
Compound 2: = 1.72
Ratio: = 2.0116 = 2.01:1.00
Thus, the ratio of the mass of xenon per gram of fluorine in the two
compounds is a small whole-number ratio of 2:1, which agrees with the law
of multiple proportions.
a) This problem requires two conversion factors: one for distance and one
for time. It does not matter which conversion is done first. Alternate
methods may be used.
To convert distance, cm to in, use: 1 in / 2.54 cm
To convert time, min to s, use:
a) chemical change
b) chemical change
c) physical change
d) same chemical properties in both C and D since it is the same substance
but has different physical properties.
a) The changes in the physical form are p
a) 248 cm3
b) 608 g
1.41 : 7.25 g/cm3
1.43 Plan: Use the equations given in the text for converting between the
three temperature scales.
a) 41C and 314 K
b) 6170F and 3683 K
c) 5.8 x 103C and 1.1x104F
Cylinder A: 7.8 g/mL - iron.
c) 0.16 L/mol
a) The speed of light is a measured quantity. It is not an exact number.
b) The density of mercury is a measured quantity. It is not an exact number.
c) The number o
1.14 Observations are the first step in the scientific approach. The first
observation is that the toast has not popped out of the toaster. The next step
is a hypothesis (tentative explanation) to explain the observation. The
hypothesis is that the spring
aluminum: 2.0x105 mm2
steel: 1.0x105 mm2
a) 117 to 122 g copper
b) 24 to 27 g zinc
a) Scene A shows a physical change. The substance changes from a solid to
a gas but a new substance is not formed.
b) Scene B shows a chemical change. Two
1) A compound has constant composition but a mixture has variable
composition. 2) A compound has distinctly different properties than its
component elements; the components in a mixture retain their individual
a) The fixed mass ratio