Chemistry, The Central Science, 10th edition

1
Chapter 1Introduction Matter and Measurement

• Chemistry, The Central Science, 10th edition
• Theodore L. Brown H. Eugene LeMay, Jr.
• and Bruce E. Bursten

Troy Wood University of Buffalo Buffalo, NY ?
2006, Prentice Hall
2
What is the elemental symbol for sodium?

1. S
2. Na
3. Sn
4. Sm
5. Sr

3
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.
4
A microgram (mg) is equal to how many grams?

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

5
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.
6
Which of the following is the smallest volume?

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

7
Correct Answer

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

8
A temperature of 68F is equal to what
temperature in degrees Celsius (C)?

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

9
Correct Answer

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

9
C 5/9 (68 ? 32) 5/9(36) 20 C
10
The boiling point of liquid nitrogen is 77 K.
What is this temperature in degrees Celsius (C)?

1. 350
2. 77
3. ?196
4. ?273
5. 0

C K 273.15
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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
12
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.

13
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
14
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.

15
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.
16
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.

17
Correct Answer

1. 4
2. 3
3. 2
4. 1
5. 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.
18
How many significant figures are there in the
following summation

1. 2
2. 3
3. 4
4. 5
5. 6

6.220 1.0 125
19
Correct Answer

1. 2
2. 3
3. 4
4. 5
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.
20
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

21
Correct Answer

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

(2.54) ? (6.2) ? (12.000) 2285.01 2300
In multiplication and division the result must be
reported with the same number of significant
figures as the measurement with the fewest
significant figures.