Mass, Density, and the Classification of Matter

Mass: the amount of matter that is in an object Volume: how much space an object takes up

How to calculate Volume Volume= length x height x width

volume = 72cm₃ volume = length x width x height volume = 6cm x 3cm x 4cm volume = 72cm₃

Graduated Cylinder Used to measure volume

Meniscus: the bottom of the curve; place of measurement

Volume of object?

Question Does volume depend on mass?

The ratio of mass and volume density = mass/volume

An object has a mass of 36 grams and takes up 12 mL An object has a mass of 36 grams and takes up 12 mL. What is its density?

Gravity A force that acts on matter The greater the matter, the greater the force

The earth’s mass is so great, that we can observe its force of gravity on us.

gravity

Buoyant Force the upward “push” which water (or any liquid) gives to an object

Surface Area When surface area is greater, more water is displaced. This causes a greater upward buoyant force

Atom a tiny particle and the basic building block of all matter

Element Made of only one type of atom Examples: Gold, copper, oxygen

Molecules Particles formed when two or more atoms are chemically glued together A molecule can be the same type of atom or different atoms Examples: water molecule and oxygen molecule

Compound A type of molecule with two or more elements Water is a compound; oxygen is not

Mixture Any number of different atoms and molecules arranged in any order 2 ways to separate a mixture 1. physical process 2. Chemical process

Physical Process Techniques that can separate the different parts of a mixture No chemical reactions

Chemical Process Chemical reactions that can be used to separate a compound into its different parts.

atom video 3D atom