Remake of Chemistry Foundations by Aubrey Lilley

aubreylilley — 2023-10-26 17:22:07 UTC

aubreylilley — 2023-10-26 17:24:19 UTC

Ice is less dense than water

aubreylilley — 2023-10-26 17:25:36 UTC

Defined as the amount of mass in a unit of volume of a substance

aubreylilley — 2023-10-26 17:29:25 UTC

Nonzero integers always count as sig.digs.

aubreylilley — 2023-10-26 17:33:53 UTC

All zeros between non-zero digits are significant (captive zero)

Leading zeros are NEVER sig.

Trailing zeros are only sig. if there is a decimal.

Operations

aubreylilley — 2023-10-27 16:04:57 UTC

Multiplying & dividing: least # of sig. digs.

Adding & subtracting: least # past decimal.

25 degrees Celcius is room temp.

aubreylilley — 2023-10-27 16:05:35 UTC

aubreylilley — 2023-10-27 16:06:45 UTC

Precision is a measure of how closely individual measurements agree with one another

Accuracy is how closely individual measurements agree with the correct / true value.

aubreylilley — 2023-10-27 16:08:48 UTC

An exact number cannot be altered by human or experimental error (i.e. counting smiley faces)

An inexact number can be altered or made incorrect due to human or machine error (i.e. measuring liters to quarts)

aubreylilley — 2023-10-27 16:14:13 UTC

Physical properties can be observed without changing the identity and composition of the substance (i.e. color, taste, luster, density)

Chemical properties describe the way a substance may change or react to form other substances. (i.e. flammability, color change, gas production)

Average atomic mass / abundance

aubreylilley — 2023-10-27 16:21:33 UTC

Average atomic mass formula: (mass of isotope 1 X abundance in decimal form) + (mass of isotope 2 X abundance in decimal form) + (mass of isotope 3 X...

ICK I ATE a humongOUS bITE

aubreylilley — 2023-11-06 17:43:21 UTC

-ite --> -ous

-ate --> -ick

I mol = 6.02 x10^23 molecules / atoms / particles

aubreylilley — 2023-11-06 17:43:55 UTC