NGSS Chemistry (ALL UNITS) - WIP

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Unit 1

All digits 1-9 inclusive are significant.
1. Example: 129 has 3 significant figures.
Zeros between significant digits are always significant.
1. Example: 5,007 has 4 significant figures.
Trailing zeros in a number are significant only if the number contains a decimal point.
1. Example: 100.0 has 4 significant figures.
2. 100 has 1 significant figure.
Zeros in the beginning of a number whose only function is to place the decimal point are not significant.
1. Example: 0.0025 has 2 significant figures.
Zeros following a decimal significant figure are significant.
1. Example: 0.000 has 3 significant figures.
2. 0.47000 has 5 significant figures.

Multiply/divide - Round to least number of sig figs in any of the factors.

eg: 23.0 cm x 432 cm x 19 cm = 188,784 cm³ The answer is expressed as 190,000 cm³ since 19 cm has only two significant figures.

Add/subtract - Round answer to least number of decimal places in any of the numbers that make up your answer.

eg: 123.25 mL + 46.0 mL + 86.257 mL = 255.507 mL The answer is expressed as 255.5 mL since 46.0 mL has only one decimal place.

Less dense things → float
Denser things → sink

vvv - (Use Alg1 skills to figure out:)
M = DV
V = M/D

Temperature - Intensity of kinetic energy

Pressure - Amount of force applied to an object

Volume - Amount of space taken

Combination of Boyle, Charles, and Amonton’s Law

P₁V₁/T₁ = P₂V₂/T₂

Pressure and Temperature (PT) - Direct relationship

Volume and Temperature (VT) - Direct relationship

Pressure and Volume (PV) - Inverse relationship

Direct relationship - 1 thing increases, other thing increases
Inverse relationship - 1 thing increases, other thing decreases

PV = nRT

0.0(0)

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