What is the elemental symbol for sodium

1
What is the elemental symbol for sodium?

• S
• Na
• Sn
• Sm
• Sr

2
Correct Answer

• S
• Na
• Sn
• Sm
• Sr

The word sodium is derived from the Latin word
natrium, meaning sodium carbonate.
3
A microgram (mg) is equal to how many grams?

• 1 ? 106 g
• 1 ? 103 g
• 10
• 1 ? 10?3 g
• 1 ? 10?6 g

4
Correct Answer

• 1 ? 106 g
• 1 ? 103 g
• 10
• 1 ? 10?3 g
• 1 ? 10?6 g

Recall that the prefix micro-means 10?6.
5
Which of the following is the smallest volume?

• 400 microliters
• 4 milliliters
• 0.4 centiliters
• 4 ? 10?5 liters
• 4 ? 105 nanoliters

6
Correct Answer

• 400 microliters
• 4 milliliters
• 0.4 centiliters
• 4 ? 10?5 liters
• 4 ? 105 nanoliters

7
A temperature of 68F is equal to what
temperature in degrees Celsius (C)?

• 10
• 12
• 16
• 20
• 24

8
Correct Answer

• 10
• 12
• 16
• 20
• 24

9
C 5/9 (68 ? 32) 5/9(36) 20 C
9
The boiling point of liquid nitrogen is 77 K.
What is this temperature in degrees Celsius (C)?

• 350
• 77
• ?196
• ?273
• 0

C K 273.15
10
Correct Answer

• 350
• 77
• ?196
• ?273
• 0

C K ? 273.15 C 77 ? 273.15 C ?196.15 K,
or ?196 K
11
A perfect cube of an unknown substance 10.0 cm in
each dimension weighs 1.59 kg. What is the
unknowns density (in g/cm3)?

• 0.159 g/cm3
• 1.59 g/cm3
• 15.9 g/cm3
• 159 g/cm3
• None of the above
• is correct.

12
Correct Answer

• 0.159 g/cm3
• 1.59 g/cm3
• 15.9 g/cm3
• 159 g/cm3
• 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
13
Which will have the larger volume 25 g of Cu
(8.94 g/cm3) or 25 g of Pb (11.34 g/cm3)?

• 25 g Cu
• 25 g Pb
• They will occupy the same volume.

14
Correct Answer

• 25 g Cu
• 25 g Pb
• 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.
15
How many significant figures are there in the
following number 1.200 ? 10?9?

• 4
• 3
• 2
• 1
• Cannot deduce from given information.

16
Correct Answer

• 4
• 3
• 2
• 1
• Cannot deduce from given information.

1.200 ? 10?9
Zeros that fall both at the end of a number and
after the decimal point are always significant.
17
How many significant figures are there in the
following summation

• 2
• 3
• 4
• 5
• 6

6.220 1.0 125
18
Correct Answer

• 2
• 3
• 4
• 5
• 6

6.220 1.0 125
132.220
In addition and subtraction the result can have
no more decimal places than the measurement with
the fewest number of decimal places.
19
How many significant figures are there in the
result of the following multiplication (2.54) ?
(6.2) ? (12.000)

• 2
• 3
• 4
• 5

20
Correct Answer

• 2
• 3
• 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.
21
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

22
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

23
How many significant figures should be shown for
the calculation?

• 1
• 2
• 3
• 4
• 5

24
How many significant figures should be shown for
the calculation?
count decimal places for addition or to 3
significant figures

• 1
• 2
• 3
• 4
• 5

25
Estimate room temperature (72F) in C.

• 15C
• 22C
• 27C
• 32C
• 37C

26
Estimate room temperature (72F) in C.

• 15C
• 22C
• 27C
• 32C
• 37C

27
Which represents the largest volume?

• 0.25 L
• 2.5 x 102 mL
• 2.5 x 106 ?L
• 2.5 x 108 nL
• 2.5 x 1010 pL

28
Which represents the largest volume?

• 0.25 L
• 2.5 x 102 mL
• 2.5 x 106 ?L
• 2.5 x 108 nL
• 2.5 x 1010 pL