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51 Cards in this Set

  • Front
  • Back
Stuff. Anything that occupies space and has mass.
PURE AND DEFINATE CHEMICAL COMPOSISTION. A sample of matter, all parts of which have 1 set of identifying properties
Propertys of Substance are retained. An association of two or more substances that are not chemically combined
Element (112)
A substance that can not be decomposed into simpler substances by ordinary chemical means
Compound (made of ______)
Obey Law of Definte Proportions. A substance of definate composistion which may be decomposed into 2+ simple substances by chemical change
Homogeneous Mixture
A uniform intermixture of particles. Samples show same composistion
EX: when alchohol is added to water and throughly mixed
Heterozygous/Heterogeneous Mixture
a mixture in which the ingredients are not uniformally dispersed. EX: salt thrown on top os sugar.
can easily be hammered into sheets
Can easily be drawn into a wire
ENERGY classic
the ability to do work
Energy is that quantity that can exert a force on an object and move it a distance
Describes a chemical reaction that releases heat energy
Describes a chemical reaction that absorbs heat energy
Able to be seen, touched - NOT needing microscope
World of atoms and elements - needs microscope
the quantity of heat requireed to raise the temperature of 1g of water by 1 degree C
Activation energy
the amount of energy required to initiate a chemical reaction
is to cause a solid to separate out from a solution as a result of a chemical reaction *soild product of a reaction
Absolute zero
Molecular motion stops INCLUDING vibrational kinetic energy
~Rotational and Vibrational
~Translational and other 2.
Law of Definate Proportions
the proportion by mass of the elements in a given compound is always the same
Law of Conservation of Mass
The sum of the mass of the products is equal to the sum of the mass of the reactants
Law of Conservation of Energy
The sum of the energy of the products is equal to the sum of the energy in the reactants (energy remains the same) total coming out has to equal 100%
Law of Conservation of Mass/Energy
E=mc2 energy can be converted to mass and vise versa. Sum of the mass and energy of the reaction is equal to the sum of the mass and energy of the products.
Intensive Physical Property
temperature and density (does not depend on system size or amount of material)
Extensive Physical Property
Mass and volume (does depend)
Chemical Property
refractive index and ductility
Physical Change
REVERSABLE- freezing point, tear paper
Chemical Change
buring wood, making cookies: NOT REVERSABLE
2 signs of a Chemcial change
1. Precipitate forms
2. A gas is being generated
Potential Energy
Stored energy in CHEMICAL BONDS
Kinetic energy
energy of motion. 3 TYPES:
1. translationsal (move)
2. Rotational (flipping)
3. Vibrational (vibrate)
Energy Conversions

*Always 1 in many out
going in: electrical
going out: electromagnetic, heat and sound
General equation of combustion reaction
organic matter (C,H, O, N) + O2 = Co2(g) + H2o(g)
All move at same speed which is the SPEED OF LIGHT = 300,000 km/s
When hit with electromagnetic energies
All the time
Heat Capacity of water
4.184 J/g*c
7 forms of energy
Chemical, Magnetic, Heat, Sound, Electrical, Mechanical, and Electromagnetic
(perpendicular) Made up of 2 components: electrical and magnetic VISABLE LIGHT
Q problems
Q = Cp M T
How to: Identify Oxygen
A smoldering splint in presence of oxygen reignites
How to: Identify Hydrogen
Buring splint in presence of hydrogen gives you a chirp or bark
General equation to produce hydrogen gas
Metal + Acid = H2
Exothermic feel
HOTT! Physical would be condesation
Endothermic feel
gets rid of translational kinetic energy
Crystal Lattice
Need billions to be able to feel smallest piece, not a perfect cube HAVE TO BREAK BOND TO GET IT TO REACT WITH SOMETHING ELSE
a form of energy produced by molecular collisions SYMBOL: Q
A measure of the average kinetic energy of the molecules of a sample
Measuring Heat
Joule is the heat capacity of water, we use a calorimer NOT THERMOMETER, which measures TEMP!
Electromagnetic Spectrum
High frequency = high energy
Cosmic, gama, x rays, u.v, visable, infared, radar, microwave, radio (least dangerous)