science exam
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47 terms
Terms | Definitions |
|---|---|
 what is WHMIS? | workplace hazard materials information system |
| what is the order of the metric conversion | T,G,M,k,h,U,C,m,u,n |
| what is matter? | anything that has mass and takes up space |
| what is the particle theory? | -all matter is made up of extremely small particles -each pure substance has different from the particles of other pure substances -particles attract each other -particles are always moving particles at higher temps move faster |
| what is density? | ratio of mass per unit volume |
| what is the desnsity mass volume traingle | M on top d and v on the bottem |
| what is a pure substance? | a substance made up of the same type of particles |
| what is a element? | made up of the same type of atom |
| what is a compound? | made of 2 or more atoms of different elements that are bonded together |
| what is a mixture? | 2 or more elements or compounds that are not bonded together |
| what is homogeneous matter | 2 or more different substance mixed so you can not tell them apart |
| what is heterogeneous matter | 2 or more different substances and you can tell them together |
| what are valence electrons | are the electrons in the last outer energy obrital |
| what is the charge and where is a proton located | has positive charge and is located in the nucleuse |
| what is the charge and where is a neutron located | is has a nutral charge and is located in the nucleuse |
| what is the charge and where is a electron located | it has a negative charge and it is located it the atoms orbitals |
| what are periods | rows that go left to right. they share the same number of electron orbitals |
| what are groups | colums that go up and down. they have the same number of valence electrons |
| what side are the metals and the non-metals on. | the metals are on the left and the non-metals are on the right |
| what are the three distinct types of elements | metals non-metals metalloid |
| how do you find the reactivity of a element | the further you go down the table the more reactive the element. |
| how do you measure the atomic radius | the more you go to the right the atomic radius increases. |
| what are ions | charged atoms |
| do metals or non-metals gain or lose electrons | metals- lose non-metals- gain |
| what are isotopes | changing the atomic mas |
| what happens when neutrons are gained or loss | the charge does not change but the atomic mass changes |
| what is a cell | basic unit of life |
| what are tissues | collection of cells of same type working to perform a function |
| what are organ systems | collection of organ and tissues working together to perform a function |
| what are individuals | a self contained organism composed of several organ systems |
| what is a population | group of individuals of the same speices |
| what is a community | group of different population |
| what is a ecosystem | a community with biotic and abiotic interactions |
| what is a biome | several ecosystems similar characteristics |
| what is a biosphere | all livable biomes |
| what are the three different ways a pyramid can be arranged | - # of organisms - biomass - energy |
| what pyramid will always have a traditional pyramid shape | energy pyramid |
| what is the formula for population growth? | birthrate+immigraction - death rate+emmigration |
| what is the key to electricity? | electrons |
| when a substance gains electrons what charge does it have | negative |
| when a substance losses electrons what charge does it have | positive |
| If a substance is higher in the electrostatic series than the other substance is it positive or negative | negative |
| what are insulators? | substances in which electrons cannot move to atom to atom. when it becomes charged it stays charged until it is removed |
| what is a conductor | substances in which electrons can move from atom to atom freely. this allows the charge to travel through and out the conductors |
| what is charging by friction | two neutral objects are rubbed together repeatedly. electrons transfered so that one object gains electrons one object losses electrons. |
| what is charging by contact | one charged object makes contract with a neutral object. electrons are transferred resulting in the charged object each having the same charge. |
| what is induced charge separation | a neutral object can become temporarily charged when a charged object causes electrons to shift towards or away from the charge. when the charged object is removed the electrons shift back. |
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