Vocalbulary # 5

thermal expasion: the expasion of the matter when its temperature is raised

pressure: the forcxe on each unit of area of a surface

melting:  the change of a solid into liquid

vaporization: the change of a liquid to a gas as molecules break free form each other

condensation: the change of a gas into a liquid as molecules attract each other

freezing: the change of a liquid into a solid

boiling: the formation of bubbles of vapor that escape from a liquid that is being heated

evaporation: the vaporization of molecules from the surface of a liquid

Vocabulary #4

kinetic energy: the energy of a moving object

potential energy: energy stored  in an object or material

temperature: the avereage kinetic energy of the molecules in a material

heat: energy that flows between object that have different temperatures

radiation: the transfer of energy by electromagnetic waves

conduction: the transfer of energy by direct contact of molecules

convection: the transfer of energy by the flow of a liquid or gas

insulation: prevents heat from flowing in or out of a material

Vocabulary #3

compound: a chemical combianation of two or more element

chemical bond: a link that atoms or electrically charged particles can form with each other

chemical formula: a way of using letters and numbers to show how much of each element is in a substances

ion: an electrically charged particle with unequal numbers of prtons and electrons

molecule: a group of bonded atoms that acts like a single particle

Chemical property: a way of describing how a substance changes chemically with other substances

exothermic: a reaction that gives off heat

endothermic: a reaction that absorbs heat

Vocabulary #2

Element: a subtance that cannot be broken down any further into anything simpler

atom: the smallest particle of an element that has the same chemical properties as the element

nucleus: an atom's dense center, where most of its mass is

electorn: a negatively charged particle that moves around an atom's nucleus

proton: a positively charged particle inside an atom´s nucleus

neutron: a particle inside an atom's nucleus

atomic number: the number of protons in an atom

metal: any of a group of elements that conduct heat and elctricity, is shiny and bendable

Vocabulary #1

matter: any, liquid, or gas

mass: amount of matter in an object

volume: the amount of space an object takes up

density: the amountof mass in a certain volume of material

physical property a property that can be observed whithout changing the indenty of a substance

physical change: a change in size, shape, or state without forming a new subtances

solution: a mixture of one substance dissolved in another so that the properties are the same throughout

chemical change: a change in matter that produce a new substance with different properties from tthe original

2011

                                                               

2011