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7th Grade Physics and Chemistry Cheat Sheet by [deleted]

Physics and Chemistry Foundation


Has Mass; Occupies Space
Classi­fic­ation by States
Solid; Liquid; Gaseous
Inter-­mol­ecular Forces (Attra­ction & Repuls­ion); Shape; Volume; Matter is classified by its behaviour at the given time.
Classi­fic­ation by Purity
pure: Substance; impure: Mixture
Element; Compound
Simplest substance; Chemical reactions cannot break them down further into other substa­nces; Smallest particle: Atom
Smallest particle: Molecule; Consists of multiple Elements
Property indepe­ndent of Shape, and Size
Physical Property
Value can be known without altering the substance.
Chemical Property
Value cannot be determined without altering the substance.
Amount of matter in the object.
Amount of space occupied by an object.
Mass per unit volume.

Mirrors & Lenses


Temper­ature & Heat

Excites the Molecules; Causes matter to Expand; Reduces its Density; Changes State of Matter.
Kinetic Energy
Anything that is in motion has Kinetic Energy.
It is a measure of the average kinetic energy of the molecules. It isn’t exactly equal to the average kinetic energy, but is directly propor­tional to the average kinetic energy of the molecules in the substance.
Temper­ature Units
Kelvin, or Celsius (Centi­grade), or Fahren­heit; °F = °C x 9/5 + 32; °C = °K + 273
Thermal Energy
Sum of kinetic and potential energies of all the particles in an object.
Heat Revisited
It is the energy "in transi­t"; Objects don’t “contain” heat, but rather transfer heat from one place to another; An object can “have” a certain amount of thermal energy, but an object cannot “have” heat.
Absolute Zero Temper­ature
All molecular motion ceases; Nothing could be colder than this; No heat energy remains in a substance; 0 K, or −273.15 °C, or −459.67 °F.
Normal Body Temper­ature
98.6 °F, or 37 °C, or 310.15 K
Latent Heat
The heat that is absorbed (or released) without raising or reducing the temper­ature. Heat absorbed causes the molecular bonds to break, and thus causes the change of state of matter.
Parts of Thermo­meter
Glass Tube; Bulb; Kink
Clinical Thermo­meter
Substance: Mercury; Range: 35 °C to 42 °C;
Laboratory Thermo­meter
Substance: Alcohol; Range: -10 °C to 110 °C;
Heat Transfer
Conduc­tion; Convec­tion; Radiation
Heat transfer between molecules by direct collision; From Hot to Cold.
Heat transfer by movement of masses; Density decreases with Heat.
Heat transfer when objects are not touching; Hot object emits electr­oma­gnetic waves.
Classi­fic­ation by heat conduc­tivity
Good Conductors of Heat: Most Metals; Insula­tors: Air, Water, Wood, Plastic



Light & Color




Under temperature units the °K should be without the degree symbol. Is correct elsewhere on the cheatsheet.

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