chemistry section one

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all substances are made from atoms. A substance made only from one atom is a...
Its called an element, there are around 100 elements and counting, the groups containing elements with similar properties are grouped and named after the properties they poses.(metals start from far left and noble gasses and halogens on other end)
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number of PROTONS
equals the atomic NUMBER
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SUM of protons and neutrons
equals the atomic MASS
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number of electrons is equal to...
the number of protons in an atom
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outer electrons have highest energy levels maximum of 8 on 2ndoutermost shell
the innermost electrons in 1st shell have lowest energy level with a max of two electrons
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elements in the same group within the periodic table have the same?
number of electrons
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group 0/8 elements on the periodic table have what specific property others do not?
elements of group 0/8 are UN-reactive as the number of electrons on the outermost shell is full so cannot gain and 'reject' attracting atoms willing to gain electrons making the Noble gasses stable elements when on their own.
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trends in group 7 and 1?
group one are soft metals and highly reactive to air and water, more so as we go down the table. group seven are fairly unreactive to air and water, are gases and get more reactive as we go UP the table...
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when atom react with each other their atoms?
Join and form a COMPOUND. This involves giving, taking or sharing electrons to form ions or molecules.
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Compounds formed from both metal or non-metal elements, are made up of?
Compounds are made up of metal or non-metal IONS.
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Compounds formed from JUST non-metals are made up of?
Compounds from just non-metals are made up of molecules. The molecules are held together by COVALENT BONDS.
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metals LOSE electrons making them?
Positive ions
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non-metals GAIN electrons making them?
Negative ions
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NO atoms are lost or made during a chemical reaction, so the MASS of the product equals?
The TOTAL mass or the products (sum of both atomic masses)
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Knowing it is the total mass complete the equation... TOTAL amount or protons+ TOTAL amount of electrons=
TOTAL mass of reactants ( or total atomic mass of both atoms is fine)
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method of precipitation practical...
Precipitation is the creation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid. When the reaction occurs in a liquid solution, the solid formed is called the precipitate
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what is a precipitation reaction used for?
to show CONSERVATION of mass and other industrial methods of making substances such as crystallised chlorine.
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Other cards in this set

Card 2

Front

number of PROTONS

Back

equals the atomic NUMBER

Card 3

Front

SUM of protons and neutrons

Back

Preview of the front of card 3

Card 4

Front

number of electrons is equal to...

Back

Preview of the front of card 4

Card 5

Front

outer electrons have highest energy levels maximum of 8 on 2ndoutermost shell

Back

Preview of the front of card 5
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