Chemistry – Gooden – Flashcards
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| Atomic Number = |
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| Proton electron |
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| Neutron number = |
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| Mass number - atomic number |
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| Mass Number = |
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| number of Proton + Number of neutron |
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| Define Isotope |
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| Elements which have different mass # |
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| CatIon is |
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| a positive ion produced when one or more electrons are lost from a neutral atom |
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| AnIon is |
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| a Negative ion that is produced when it gains one extra electron. |
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| Who was the frst to try to explain why chemical changed occur |
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| Greeks 1000 B.C. |
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| Who was the first scientist ot recognize the importance of careful measurements? |
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| Robert Boyle |
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| a substance was an element unit unless what? |
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| It would be broken down into two or more simpler substances |
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| what is the law of constant compositon |
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| it means a given compound always has the same positoin regardless of where it comes from |
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| what did John Dalton became known as |
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| Related nature to chemical properties called Dalton's atomic theory |
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| Dalton Atomic Theory is |
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| Elements are made of timey particles called atoms Atoms are indivisible in chemical process |
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| define compound |
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| A distinct substance that is composed of the atoms of two or more elements |
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| electrons are |
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| negative particles |
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| a proton is charged |
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| positively |
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| Defined Isotopes |
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| Atoms witht he same number of protons but different number of neutrons |
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| Smallest chemical units are called |
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| Molecules |
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| Nobel gases are |
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| complete electrons on outer shell and doesnt' react with other elements |
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| Name the number of elements |
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| Natural 90 and Man made 26 |
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| Define Law of conservation of matter |
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| Matter is unchanged during a chemical change |
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| Name the most abundant element? |
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| Oxygen |
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| Define Chemical formula |
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| Makeup of compound it indicated the kinds and numbers of atoms |
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| Name 2 classes of compounds |
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| molecular and Ionic |
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| a compound is |
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| consist of two or more elements in the same porportion (always fixed ratio) |
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| Diatomic molecules are? |
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| molecules made up of two atoms |
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| what is an ION |
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| A single atom or a group of atoms having a difficienty or excess number of electrons |
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| How does the trend on period table go? IA IIA IIIA IVA VA VIA VIIA VIIIA |
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| +1 +2 +4 4 -3 -2 -1 dont ionize easily |
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| what is the symbol for cation? |
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| + |
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| What is the symbol of Anion |
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| - |
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| Chemical reaction is |
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| A change in the compositions of substances, due to energy involved bonds broken and formed. |
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| What is appearance of chemical reaction? |
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| color change, physical state(solid gasious bubles), evolution of heat or absorption of heat, evolving of light(sound pressure) example an explosion |
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| Chemical equation |
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| Series of symbols to represent a chemical reaction |
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| Elements consist of? |
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| Consist of only 1 kind of atom |
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| Chemical formula |
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| Shows makeup of a compound and indicates the kinds and number of atoms |
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| What is Quantum Mechanical |
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| Physic theory nature of matter consist of particle also matter had waives (ligh, sound) BEST to DATE |
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| Atoms consist of three main ones |
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| electron, proton and neutrons |
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| what is PET |
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| Posititron emission tomography used by positrons |
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| What is the subatomic makeup of: 94 SR 38 |
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| posibbly on test - look up |
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| The periodical table is what? |
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| An arrangement of the elements in creasing atomic number from smallest to largest . Which reflects trends of the similiarites of their chemical and physical properties |
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| On the Periodic table Rows are called what? |
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| Periods recurrances in properties |
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| On the Periodic table columns are called what? |
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| Families or group, which are a collection of elements which have the most similar of chemical and physical properties |
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| Metals posses common set properties what are they? |
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| Shinny, conduct electricity and heat efficiently, mostly hard. Mercury only element not solid |
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| Non metals possess common set properties what are they? |
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| Brittle (will shatter) liquids and gases at room temperature, Dont' conduct electricity insulators |
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| What is scientific law? |
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| States elements in same families will have similar chemical and physical proerties. THIS IS TRUE ALWAYS |
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| Name One 2008 Nobel prize winner |
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| Discovery of subatomic particles by Kobashe |
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| The ionization of the representative elements is called? |
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| Periodic property |
