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Physical Change-Alters physical properties not composition

Chemical Change-when substance(s) are converted to different substance

Solid-Particles lie close next to each other in 3d array

Liquid-Close together but move randomly

Gas- Particles have large distance in between them

Energy is the ability to do work

Potential Energy-energy due to position of object (higher-less stable)(lower-more)

Kinetic Energy-energy due to motion of object

Conversion

We put the given in the denominator to cancel it out , and the wanted in the numerator.

(beginning unit)( final unit/beginning unit)=final

(beginning unit x beginning unit) x final unit2/beginning unit2=final unit2

Ex: Convert 150km to m

(150km)(1000m/1km)= 150 000m

Ex: (Note: 1mL=10-3 L ) Convert 4.6mL to cm3

(4.6mL)(1cm3/1mL)= 4.6cm3

Density= mass/volume

Kalvin zero point=-273.15

Sig Figs:

Addition and Subtraction: Same number of decimal places as the one with the fewest

2.06mL-1.1mL=0.96mL=1.0mL

Multiplication and Division: Same number as total amount of sig figs for the smallest one

2.2 x 3.7845=8.3

Uncertainity:

All measurements have uncertainty, the last digit is the uncertain digit.

Ex: 100mL volumetric flask that is guaranteed to contain the specified volume within

0.1mL. How Many sig figs?

100.0 +/- 0.1mL , 4 sig figs

Rounding:

=5,5 after zeros,even numbers remain unchanged(3.45=3.4), odd numbers inc. by 1

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