Chem quiz 1

Cards

Matter anything that has mass and takes up space
Space referred to as volume
Macroscopic large seen by the naked eye
Microscope small seen by a microscope
Particulate very small not seen
model a representation
3 States of matter solid liquid gas
solid definate volume and shape solid molecules are immobile, molecules attraction, minimal space between molecules
Liquid indefinete shape and volume/definite volume same molecular attraction large space between molecules
Gas indefinete shape and volume because of rapid moleculer movement. virtually no moleculer attraction free moving maximum space between moleculs - diffusion
diffusion rapid movement of molecules away from the source only gas is difused
Kinetic Molecular Theory all matter consists of tiny particles in constant motion
Chemical change/ properties 1. usually energy is needed 2. New substance is produced by a chemical change/property ex. cooking an egg
Physical changes/properties 1. measured by your senses 2.property- color, order, taste, state of matter, texture 3.Substance remains the same
Pure substance same material throughout (elements and compounds)
Mixtures different materials physically mixed together
Homogeneous mixture same through out ex. salt/water true solution
true solutions must be mixtures not compounds
Heterogeneous mixture different throughtout oil/water
Seperation of mixtures done by physical means ex. distillation
Filtration Seperation of materials via a porous medium
Elements substance which can't be broken down
two classes of elements metal and non metals
Metals Conduct electricity conduct heat reflect light reflect heat colorful/lusterous Hardness
non metals do not conduct electricty do not conduct heat do not relect heat dull colors brittle if solid
maleable hammer into shapes metal
ductile draw into wire form
elastic return to form after stress
Chemical symbols 1. Abbreviation of the name of the element 2. Represents one atom of the element
Chemical symbol abbreviations first letter captilized usually second letter is the lower case usually the second phonetic letter of the name ex. Chlorine= Cl or Calcium= Ca
Compounds 1.Substances which may be decomposed 2. substances which are produced by uniting two or more elements chemically 3. Compounds are produced with an energy change 4. Properties of a compound differ from the properties of it's elements
Force push and a pull= movement different charges attract
Chemical equation short hand uses symbols left of equation reactants and products on the right side.
two types of energy exothermic change endothermic change
exothermic change energy is liberated + energy
Endothermic change energy is absorbed - energy
Law of definit proportions the mass,compostition of a compound is constant usually mesured in percentages
Law of Multiple Proportions invovles a series of binary compounds in which same elements appear and one element is held constant- the other element varies as a whole number ratio
Law of conservation mass both sides of a balanced equation must contain the same number and type of atoms(arrangements must be different)numbers and types must be the same Mass ofo the reactants must equal mass of products
Kinetic energy energy ofo motion
Potential energy stored energy
Total energy sum of kinetic energy and potential energy total energy has to be constant