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# Matter and Density

### Matter, Ratio of Mass and Volume

the amount of matter a material contains Mass
a pure substance that is composed of a single type of atom Element
a substance made up of two or more different types of atoms Compound
True or False: Only solid forms of matter are made up of atoms False. ALL matter is made up of atoms.
the smallest unit of an element that retains the properties of that element Atom
the amount of space occupied by an object Volume
anything that has mass and takes up space Matter
A 100 mL graduated cylinder was filled with water to the 50 mL mark. A rock was then added to the cylinder. After the rock was added, the volume of the cylinder was 65 mL. What is the volume of the rock? 15mL (65mL-50mL=15mL)
You calculate density by.... Mass divided by volume (ratio of mass: volume)
Something will float on a substance when its ratio is Lower than the other substance. (Oil floats on water because its mass:volume answer is less than water's 1g:1mL)
three PHASES of matter Solid, liquid, gas
phase of matter with a fixed volume and fixed shape Solid
phase of matter with a fixed volume but no fixed shape Liquid
phase of matter with no fixed volume or no fixed shape Gas
Molecules in a solid vibrate in place and are tightly packed
Molecules in a liquid Slide past each other and are close together but not organized
Molecules in a gas Zoom around and are very far apart
Evaporation Liquid to gas
Condensation Gas to liquid
Melting Solid to liquid
Freezing Liquid to solid
Sublimation Solid to Gas
Endothermic Heat going into
Exothermic Heat going out
Heat Energy causes molecules to vibrate or move
Temperature Movement of the Molecules
Difference between temperature and heat Temperature can stop going up but heat never stops going up or down
Density is... The ratio of mass to volume (mass:volume). The number of atoms in a space.
If salt waterâ€™s density (mass:volume ratio) is 1.19 g/mL, what will happen if an object with a density (mass:volume ratio) of .85 g/mL is dropped into a container with salt water? It will float because the mass to volume ratio is less than the salt water's mass:volume ratio.
Created by: meginnij