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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Expressing Units

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QUESTION ANSWER

1.

Identify the unit in each quantity.

  1. 2 boxes of crayons
  2. 3.5 grams of gold

1.

  1. boxes of crayons
  2. grams of gold

3.

Identify the unit in each quantity.

  1. 9.58 s (the current world record in the 100 m dash)
  2. 6.14 m (the current world record in the pole vault)

3.

  1. seconds
  2. meters

5.

Indicate what multiplier each prefix represents.

  1. k
  2. m
  3. M

5

  1. 1,000 ×
  2. 1/1,000 ×
  3. 1,000,000 ×

7.

Give the prefix that represents each multiplier.

  1. 1/1,000th ×
  2. 1,000 ×
  3. 1,000,000,000 ×

7.

  1. milli-
  2. kilo-
  3. giga-

9.

Complete the following table with the missing information.

Unit Abbreviation
kilosecond  
  mL
  Mg
centimeter  

 

9.

Unit Abbreviation
kilosecond ks
milliliter mL
megagram Mg
centimeter cm

11.

Express each quantity in a more appropriate unit. There may be more than one acceptable answer.

  1. 3.44 × 10−6 s
  2. 3,500 L
  3. 0.045 m

11.

  1. 3.44 μs
  2. 3.5 kL
  3. 4.5 cm

13.

Express each quantity in a more appropriate unit. There may be more than one acceptable answer.

  1. 43,600 mL
  2. 0.0000044 m
  3. 1,438 ms

13.

  1. 43.6 L
  2. 4.4 µm
  3. 1.438 s

15.

Multiplicative prefixes are used for other units as well, such as computer memory. The basic unit of computer memory is the byte (b). What is the unit for one million bytes?

15.

megabytes (Mb)

17.

Acceleration is defined as a change in velocity per time. Propose a unit for acceleration in terms of the fundamental SI units.

17. 

meters/second2

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