Slide 1 of 33 International System of Units 3.2
Jan 06, 2016
Slide 1 of 33
International System of Units 3.2
Slide 2 of 33
© Copyright Pearson Prentice Hall
The International System of Units
> Measuring with SI Units
Bell Work
Which five SI base units do chemists commonly use?
3.2
Slide 3 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Measuring with SI Units
The five SI base units commonly used by chemists are the meter, the kilogram, the kelvin, the second, and the mole.
Slide 4 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Units of Length
Meter
Slide 5 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Common metric units of length include the centimeter, meter, and kilometer.
Slide 6 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Units of Volume
Solid object: cubic meter (m)3
Liquid: Liter (L)
(10 cm 10 cm 10 cm = 1000 cm3 = 1 L).
Or
1 mL = 1 cm3
Slide 7 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Common metric units of volume include the liter, milliliter, cubic centimeter, and microliter.
Slide 8 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Units of Mass
Kilogram
A gram (g) is 1/1000 of a kilogram; the mass of 1 cm3 of water at 4°C is 1 g.
Slide 9 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Common metric units of mass include kilogram, gram, milligram, and microgram.
Slide 10 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Weight is a force that measures the pull on a given mass by gravity.
The astronaut shown on the surface of the moon weighs one sixth of what he weighs on Earth.
Slide 11 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Units of Temperature
Temperature is a measure of how hot or cold an object is.
Thermometers are used to measure temperature.
Slide 12 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Scientists commonly use two equivalent units of temperature, the degree Celsius and the kelvin.
Slide 13 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
On the Celsius scale, the freezing point of water is 0°C and the boiling point is 100°C.
On the Kelvin scale, the freezing point of water is 273.15 kelvins (K), and the boiling point is 373.15 K.
The zero point on the Kelvin scale, 0 K, or absolute zero, is equal to 273.15 °C.
Slide 14 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Because one degree on the Celsius scale is equivalent to one kelvin on the Kelvin scale, converting from one temperature to another is easy. You simply add or subtract 273, as shown in the following equations.
© Copyright Pearson Prentice Hall
SAMPLE PROBLEM
Slide 15 of 33
3.4
© Copyright Pearson Prentice Hall
SAMPLE PROBLEM
Slide 16 of 33
3.4
© Copyright Pearson Prentice Hall
SAMPLE PROBLEM
Slide 17 of 33
3.4
© Copyright Pearson Prentice Hall
SAMPLE PROBLEM
Slide 18 of 33
3.4
© Copyright Pearson Prentice Hall
Slide 19 of 33
Practice Problems
Problem Solving 3.17 Solve Problem 17 with the help of an interactive guided tutorial.
for Sample Problem 3.4
Slide 20 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
Units of Energy
Energy is the capacity to do work or to produce heat.
The joule and the calorie are common units of energy.
Slide 21 of 33
© Copyright Pearson Prentice Hall
The International System of Units
>3.2 Units and Quantities
The joule (J) is the SI unit of energy.
One calorie (cal) is the quantity of heat that raises the temperature of 1 g of pure water by 1°C.
© Copyright Pearson Prentice Hall
Slide 22 of 33
Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section
3.2 Section Quiz.
3.2.
© Copyright Pearson Prentice Hall
Slide 23 of 33
3.2 Section Quiz.
1. Which of the following is not a base SI unit?
a. meter
b. gram
c. second
d. mole
© Copyright Pearson Prentice Hall
Slide 24 of 33
3.2 Section Quiz.
2. If you measured both the mass and weight of an object on Earth and on the moon, you would find that
a. both the mass and the weight do not change.
b. both the mass and the weight change.
c. the mass remains the same, but the weight changes.
d. the mass changes, but the weight remains the same.
© Copyright Pearson Prentice Hall
Slide 25 of 33
3.2 Section Quiz.
3. A temperature of 30 degrees Celsius is equivalent to
a. 303 K.
b. 300 K.
c. 243 K.
d. 247 K.
END OF SHOW