CHEM 6A Lecture 4: CHEM W1 Lec 10/6/17
3 Jun 2018
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78.5 cal
oz
3.5 oz
Hot dog
53 Hot dogs
8.5 min
= 1.71 * 103 cal
min
1.71 * 103
min
min
60 s
C
4184
1000
Cal
Conversion Factors
â—Ź 1g = 1000mg
â—Ź 10-3g = 1mg
â—Ź 1000m = 1km
â—Ź Put units and conversion factors into grids to get the correct unit
Ex. A man ate 53 hot dogs in 8.5 mins. Each hot dog weighs 3.5oz and provides 78.5
calories/oz. How many joules did the man consume per second?
â—Ź Want J/s
â—Ź 78.5 cal = 1oz
= 120J/s
d = m/v
v = m/d
m = d * v
Ex. Find the volume in mL of a sample of osmium (d = 22.5 g/cm3) that has a mass of 255g.
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CHEM 6A Full Course Notes
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Document Summary
Put units and conversion factors into grids to get the correct unit. A man ate 53 hot dogs in 8. 5 mins. Each hot dog weighs 3. 5oz and provides 78. 5 calories/oz. = 120j/s d = m/v v = m/d m = d * v. Find the volume in ml of a sample of osmium (d = 22. 5 g/cm3) that has a mass of 255g. Liquids: fixed volume, take shape of container. Gases: take volume and shape of container. Physical: something you can observe without changing the identity. Intensive: does not depend on the size of the sample (e. g. temperature, density) Extensive: does depend on the size of the sample (e. g. mass, volume) Chemical: the ability of a substance or mixture to change (undergo a chemical reaction) Physical separation - not changing the substance itself, separating two physical things. An element consists of a single type of atom (greek root: atomon = indivisible)
