CHEMISTRY the study of matter MATTER anything that has mass and has volume.

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Presentation transcript:

CHEMISTRY the study of matter

MATTER anything that has mass and has volume

2 Properties of Matter 1) Mass A measure of how difficult it is to change the object’s motion (b.k.a. inertia) Units on mass: kilograms, grams, (pounds)

Massive objects are harder to move. Thus they have more matter and more inertia Which has more inertia?

Weight vs. Mass Weight Mass Depends on gravity (changes depending on where you are) Stays the same EVERYWHERE!!!

2 Properties of Matter 2) Volume The amount of space an object occupies Units on volume: milliliters, liters, (cup, gallon)

An object’s volume can be found in 4 basic ways: 1.Multiplying dimensions together (lwh, πr 2 h,4/3 πr 3 ) Volume displacement Using a liquid measure (mL) As a derived unit (D=m/v)

Density The ratio of an object’s mass to its volume

Units: g/mL, g/cm 3

Anything with a density of GREATER than 1g/mL will sink in water. Anything with a density LESS than 1g/mL will float in water.

A block of wood has a mass of 28 grams. If its volume is 14 cm 3, what is the density of the wood? 2.0 g/cm 3

The density of gold is 19.3 g/mL. What is the mass of a piece of gold with a volume of 34.5 mL? 666 grams

Air has a density of g/mL. How much volume does 48,000 grams of air take up? 3.7 x 10 7 mL

PROBLEM What is the density of sand?

PROBLEM Are your 10 pennies made before 1982 or after 1982?

Accuracy How close a measurement is the correct or true measurement

Precision How close a set of measurements are to each other (regardless of how correct they are)

% Error A quantitative comparison between your value and an accepted value

Your value for water density = 0.88 Accepted value for water density = 1.0 Calculate the % error in your measurement!