# Quiz 1 - Red River College by gjjur4356

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• pg 1
```									What is the elemental symbol for
sodium?
1. S
2. Na
3. Sn
4. Sm
5. Sr
1. S
2. Na
3. Sn
4. Sm
5. Sr
The word sodium is
derived from the Latin
word natrium, meaning
sodium carbonate.
A microgram (mg) is equal to how many
grams?

1.   1  106 g
2.   1  103 g
3.   10
4.   1  103 g
5.   1  106 g

1.   1  106 g
2.   1  103 g
3.   10
4.   1  103 g   Recall that the prefix
5.   1  106 g   micro-means 106.
Which of the following is the smallest
volume?

1.   400 microliters
2.   4 milliliters
3.   0.4 centiliters
4.   4  105 liters
5.   4  105 nanoliters

1.   400 microliters
2.   4 milliliters
3.   0.4 centiliters
4.   4  105 liters
5.   4  105 nanoliters
A temperature of 68°F is equal to what
temperature in degrees Celsius (°C)?

1.   10
2.   12
3.   16
4.   20
5.   24

1.   10
2.   12
3.   16
°C = ( F-32 )
4.   20
5 °
5.   24            9
°C = 5/9 (68  32) = 5/9(36) = 20 °C
The boiling point of liquid nitrogen is
77 K. What is this temperature in
degrees Celsius (°C)?
1.   350    ° C = K – 273.15
2.   77
3.   196
4.   273
5.   0

1.   350
2.   77
3.   196
4.   273
5.   0
°C = K  273.15
°C = 77  273.15
°C = 196.15 K,
or 196 K
A perfect cube of an unknown substance
10.0 cm in each dimension weighs 1.59
kg. What is the unknown’s density
(in g/cm3)?
1.   0.159 g/cm3
2.   1.59 g/cm3
3.   15.9 g/cm3
4.   159 g/cm3
5.   None of the above
is correct.

1.   0.159 g/cm3
2.   1.59 g/cm3
3.   15.9 g/cm3          Density =
mass
4.   159 g/cm3                       volume
5.   None of the above
is correct.
Density = 1.59 kg/(10.0 cm)3
Density = 1.59 kg(1000 g/1 kg)/1000. cm3
Density = 1.59 g/cm3
Which will have the larger volume:
25 g of Cu (8.94 g/cm3) or 25 g of Pb
(11.34 g/cm3)?

1. 25 g Cu
2. 25 g Pb
3. They will occupy the
same volume.

1. 25 g Cu
2. 25 g Pb
3. They will occupy the
same volume.

According to the density,
25 g Cu will occupy
2.80 cm3 while 25 g Pb will
occupy only 2.20 cm3.
How many significant figures are there
in the following number: 1.200  109?
1. 4
2. 3
3. 2
4. 1
5. Cannot deduce from
given information.
1. 4
2. 3
1.200  109
3. 2
4. 1
Zeros that fall both at
5. Cannot deduce from   the end of a number and
given information.   after the decimal point
are always significant.
How many significant figures are there
in the following summation:

1.   2
6.220
2.   3
3.   4          1.0
4.   5      + 125
5.   6

1.   2
6.220
2.   3
3.   4              1.0
4.   5          + 125
5.   6            132.220

In addition and subtraction the result can have
no more decimal places than the measurement
with the fewest number of decimal places.
How many significant figures are there
in the result of the following
multiplication:
(2.54)  (6.2)  (12.000)

1.   2
2.   3
3.   4
4.   5

1.   2
2.   3
3.   4
4.   5
(2.54)  (6.2)  (12.000) = 188.976= 190
In multiplication and division the result must be
reported with the same number of significant
figures as the measurement with the fewest
significant figures.
If you have equal masses of the following metals, which will
occupy the largest volume?

•   Au, density = 19.3 g/cm3
•   Pb, density = 11.3 g/cm3
•   Ag, density = 10.5 g/cm3
•   Cu, density = 8.92 g/cm3
•   Al, density = 2.70 g/cm3
If you have equal masses of the following metals, which will
occupy the largest volume?

•   Au, density = 19.3 g/cm3
•   Pb, density = 11.3 g/cm3
•   Ag, density = 10.5 g/cm3
•   Cu, density = 8.92 g/cm3
•   Al, density = 2.70 g/cm3
How many significant figures should be shown for the
calculation?

•    1
1.25  0.45
•    2
•    3                         2.734
•    4
•    5


How many significant figures should be shown for the
calculation?

count decimal places for
•    1
1.25  0.45            addition … or to 3
significant figures
•    2
•    3          2.734
•    4
•    5


Estimate room temperature
(~72°F) in °C.

•   ~ 15°C
•   ~ 22°C
•   ~ 27°C
•   ~ 32°C
•   ~ 37°C
Estimate room temperature
(~72°F) in °C.

•   ~ 15°C
•   ~ 22°C
•   ~ 27°C
•   ~ 32°C
•   ~ 37°C
Which represents the largest
volume?
•   0.25 L
•   2.5 x 102 mL
•   2.5 x 106 mL
•   2.5 x 108 nL
•   2.5 x 1010 pL
Which represents the largest
volume?
•   0.25 L
•   2.5 x 102 mL
•   2.5 x 106 mL
•   2.5 x 108 nL
•   2.5 x 1010 pL

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