{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Week 2 Lectures - Chem 139

# Week 2 Lectures - Chem 139 - Fundamental Units SI System...

This preview shows pages 1–10. Sign up to view the full content.

Fundamental Units SI System Examples: Mass (weight): Length: Temperature: Time: Pressure: Other measurement units are derived from the base units; accordingly, they are called Derived Units Examples: Density, Speed, Concentration Kilogram (kg) Meter (m) Kelvin (K) Second (s) Pascal (Pa)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Mass vs. Weight Weight = mass x acceleration due to gravity Mass ≠ Weight!
Length leads to Volume Fundamental Unit of Length = 1 meter Defined as distance traveled by light in 1 / 299,792,468 second 1 / 100 of a meter is a centimeter (cm) A cube of water that is 1 cm on a side has a volume of 1 cm 3 This volume of water is one milliliter (ml) 1 ml = 1 cm 3 (remember this!) It has a mass of 1 gram at 4C thus, 1 ml (of water ) weighs 1 gram at 4C. 1000 ml = 1 liter; how much does this weigh? 1 liter = 1 dm 3 (handy to know) 1 cubic meter has 1000 liters …. How much does this weigh?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
4 Temperature http://climate.uvic.ca/climate-lab/front_page_pics/temperature.html http://www.sensorprod.com/dynamic/temperature_mapping.php
8 Fig. 3-8, p. 77 Note that the “size” of a degree is different in the Fahrenheit and Celsius scales. F = 9/5*C + 32 The Celsius and Kelvin scales have the same degree size. K = C + 273 http://www.sizes.com/units/tempera ture_Fahrenheit.htm

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Temperature Conversions 1. Convert 38 F to Celsius. 2. Convert 295 K to Celsius. 3. Convert 58 F to Kelvin.
Chemical Kinetic Energy Petrucci, Fig. 7.9 How do molecules move around? Translation: motion through space Rotation : motion about the center of mass Vibration: motion directed through chemical bonds

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Kinetic Molecular Theory Temperature = movement of particles Hot objects have (fast/slow) _______moving particles Cold objects have (fast/slow) _______moving particles Increasing the speed of particles (increases/decreases) __________ temperature Only temperature without particle movement is ___________________________ How do particles in a solid move vs. in a liquid or gas?
Faster water molecules Slower water molecules Lukewarm water (50 o C) Faster, slower?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}