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

Summary #3

Food Web and Food Chain
Food Web and food webs are representations of the predator-prey relationships between species within an ecosystem or habitat
Food Chain
They are called producers because only they can manufacture food from inorganic raw materials.
This food feeds herbivores, called primary consumers.
Carnivores that feed on herbivores are called secondary consumers.
Carnivores that feed on other carnivores are tertiary (or higher) consumers

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