Quiz 1 - Red River College by gjjur4356

VIEWS: 5 PAGES: 28

									What is the elemental symbol for
sodium?
 1. S
 2. Na
 3. Sn
 4. Sm
 5. Sr
        Correct Answer:
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
            Correct Answer:


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
            Correct Answer:


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
           Correct Answer:

 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
        Correct Answer:

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.
           Correct Answer:

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.
             Correct Answer:

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.
       Correct Answer:
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
              Correct Answer:

     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
              Correct Answer:

     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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