|
Erstellt von ellanabishop
vor etwa 11 Jahre
|
|
Frage | Antworten |
the ..... of attraction between molecules are weak | intermolecular forces |
this results in them having .. | low melting points |
they also do not .... | conduct electricity |
because... | they do not have any free electrons |
the group one elements are also known as the | the alkali metals |
alkali metals are stored under oil because... | they are very reactive with air and water |
in a flame test lithium goes.. | RED |
sodium goes.. | YELLOW |
and potassium goes.. | PURPLE |
whats the formula for the reaction with alkali metals and water? | alkali metal+water-->alkali metal hydroxide+hydrogen |
what is the balanced symbol equation for this? | 2(AM)+2H2O--->2(AM)OH+H2 |
the melting point and boiling point of the alkali metals ...... going down the group | decrease |
the density ..... going down the group | increases |
what happens when a group 1 element reacts? | the atom looses 1 electron to form a positive ion with a stable electronic structure |
why do the alkali metals become more reactive as you go down the group? | because the outer shell gets further away from the nucleus making it easier for the atom to lose an electron |
what is oxidation? | the loss of electron from an atom |
what is another word used for the group 7 elements? | The halogens |
at room temperature chlorine is a | green gas |
bromine is an | orange liquid |
iodine is a | grey solid |
what is iodine used as? | an antiseptic to sterilise wounds |
what is chlorine used for? | sterilising water and to make pesticides and plastics |
when group 1 and group 7 elements react the formula is | group 1 element+group 7 element ----> group 1 element group 7 element with 'ide' on the end |
as we go down the group the halogens become ... reactive | less |
and their melting and boiling points ... | decrease |
a more reactive halogen.... a less reactive halogen | displaces |
whats the formula for reacting 2 group 7 elements together? | potassium bromide +chlorine ----> potassium chlorine + Bromine |
what happens when a group 7 element reacts? | it gains one electron to form a negative ion with a stable electronic structure |
what is reduction? | the gain of electrons |
the halogens become less reactive as you go down the group because.. | the outer shell gets further away from the nucleus meaning it's harder for the atom to gain an electron |
what's an easy way to remember oxidation and reduction? | OILRIG Oxidation Is Loss of electrons Reduction Is Gain of electrons |
in transition metals copper compounds are... | BLUE |
iron compounds are .. | GREY/GREEN |
iron compound(III) are | ORANGE/BROWN |
many transition metals and their compounds can be used as | catalysts |
give 2 examples of when transition metals are used as catalysts? | 1.iron is used in the haber process 2.nickel is used in the manufacturing of margarine |
what is thermal decomposition? | a reaction where a substance is broken into similar substances by heating |
what is the reaction between a transition metal ion and sodium hydroxide solution called? | a precipitate reaction |
what can iron be used for? | to make steel which is used to make cars and grinders because it is very strong |
what is copper used for? | to make electrical wiring as it is a good conductor. it was also used to make brass |
give 5 properties of metals. | 1.lustrous eg gold(jewellery) 2.hard (high density) 3.High tensile strength 4.High melting and boiling points 5. Good conductors of heat and electricity |
what type of bonds do metals have? | strong metallic bonds |
how are these metalic bonds formed? | metal atoms packed so close together that the outer electron shells overlap and form the bond |
how are metals able to conduct electricity? | because the atoms are very close together and the electrons can move from atom to atom |
what is a superconductor? | a metal at a very low temperature which has very little resistance |
what do scientists want to find? | a superconductor that will work at room temperature as very low temps are costly to maintain and impractical for large scale uses |
what are the 4 main sources of water? | reservoirs 2.lakes 3.rivers 4.aquifiers |
name 4 things water can contain before it is treated and purified? | 1.insoluble particles 2.pollutants 3.microbes 4.dissolved salts and minerals |
what charge do electrons have? | negative charge |
what charge to protons have? | positive charge |
what charge do neutrons have? | neutral charge |
what are the 3 main stages of the water treatment process? | sedimentation 2.filtration 3.chlorination |
what is an isotope? | when a element has the same number of protons but a different number of neutrons |
what is the atomic number? | the number of protons and the number of electrons an element has |
what is the mass number? | the number of protons and neutrons added together |
what is an element? | a substance that cannot be broken down chemically and contains only one type of atom |
what is a compound? | a substance that contains at least two elements that are chemically combined |
what is the electronic structure of what electrons occupy which each shell in an atom? | 2, 8, 8 |
the groups along the top determine | how many electrons the atom has on it's outer shell |
the groups down the side determine | the amount of shells the atom has |
the right hand side of the periodic table is the... | non metals |
the left hand side of the periodic table is the.. | metals |
the middle of the periodic table is the... | transition elements |
an ionic bond is... | a bond between a metal and a non metal |
why are we prevented from distiling our water? | because it takes a lot of energy and the costs are too high |
in an ionic bond the electrons.. | transfer |
a covalent bond is a bond between.. | 2 non metals |
in a covalent bond the electrons are... | shared |
group 1 elements reactivity goes .... as you go down the periodic table | UP |
give 3 examples of pollutants that may be found in water. | 1.nitrates from run off fertilisers 2.lead for old pipes and plumbing 3.pesticides from crop spraying |
Möchten Sie mit GoConqr kostenlos Ihre eigenen Karteikarten erstellen? Mehr erfahren.