chemistry

?
  • Created by: 16chlhan
  • Created on: 28-09-20 22:43
what are the three states of matter ?
solid, liquid and gas
1 of 45
how are the particles represented ?
small spheres
2 of 45
which states contain particles in a random arrangement ?
liquid and gas
3 of 45
why do substances have different melting points ?
it depends on how strong the bonds are between the particles
4 of 45
what does a solid turn to at its melting point ?
a liquid
5 of 45
what does a liquid turn to at its boiling point ?
a gas
6 of 45
how can you tell that H2O has a covalent bond ?
A covalent bond is between two non- metals
7 of 45
how do we represent the bonding in a diagram?
we use dot and cross
8 of 45
how are ionic compounds formed ?
when metals react with non- metals].
9 of 45
what is ionic bonding ?
ionic compounds held together by strong forces of attraction between their oppositely charged ions
10 of 45
why do ionic solids have high melting points?
it takes a lot of energy the break the many bonds.
11 of 45
why can ionic substances conduct electricity when molten or when dissolved in water ?
the ions are free to move meaning they can conduct electricity
12 of 45
how are covalent bonds formed ?
when atoms of non- metals share pairs of electrons with others
13 of 45
how do roup 7 form a singe covalent bond ?
they gain an electron
14 of 45
what can many substanes containing covalent bonds also consist of ?
simple molecules but some have giant covalent structures
15 of 45
what charge do simple molecules have ?
No overall charge meaning they can't carry electrical charge and cannot conduct electicity
16 of 45
what are the limitations of the dot and cross diagrams ?
they don't show the actual shape of the molecule.
17 of 45
what do dot and cross diagrams actually show ?
all they show is the electrons from different atoms differently 1
18 of 45
what are intermolecular forces ?
the forces of attraction between molecules
19 of 45
which forces are broken when a small molecule melts?
the weaker intermolecular forces
20 of 45
what are polymers?
repeating chains of molecules covalently bonded together
21 of 45
what state of matter are polymers at room temperature ?
solid
22 of 45
why does sucrose not conduct electricity?
the molecules are strong covalent bonds
23 of 45
give an example of a giant covalent structure ?
diamond
24 of 45
what do the carbon atoms in diamond have and what does it do?
they have rigid covalent structures which makes it a very hard substance
25 of 45
why does diamon have a very high melting point ?
because of carbons rigid covalent structure
26 of 45
give a similarity between diamond and graphite?
they both have a giant covalent structure
27 of 45
give difference between graphite and diamond?
graphite can conduct electricity and heat
28 of 45
what is a fullerene?
molecules of carbon atoms with hollow shapes
29 of 45
what the structure of a fullerene?
it is based on hexagonal rings of carbon atoms
30 of 45
what are the uses of fullerenes?
transporting drugs to specific parts of the body and also as catalysts
31 of 45
what is graphene?
a single layer of graphite and just one atom thick
32 of 45
give one similarity between graphite and graphene?
theyre both bonded by carbon
33 of 45
give a difference between graphite and graphene
the structure of the two are slightly different
34 of 45
how are the atoms arranged in metals?
they're tightly packed together and in regular layers
35 of 45
what forces hold metal atoms in place in their giant structures?
the ions surrounded by sea of delocalised electrons
36 of 45
what are alloys ?
a mixture of metals r metals with other elements
37 of 45
give an example of an alloy?
steel
38 of 45
why are alloys often more used than pure metals ?
they are harder because the different sized atoms distort the regular pattern of the atoms in the layers making it more difficult for the layers to slide over each other
39 of 45
why are metals good conductors of electricity ?
the electrical and thermal charge is quicklly transferred through the giant metallic structure by the free moving delocalised electrons
40 of 45
what is nanoscience?
it's the study of small particles that are between 1 and 100 nanometres in size
41 of 45
what is a nanoparticle?
small particles that are between 1 and 100 nanometres in size
42 of 45
a nanoparticle is 0.000000005 m in size. write that in standard form?
5 x 10-9
43 of 45
what are the risks of nanotechnology?
nanoparticles could enter the environment which can also affect aquatic life by accumulating organisms over time. breathing in the particle can damage our lungs
44 of 45
give two uses of nanotechnology?
large surface area of nanoparticles makes them very effective as catalysts
45 of 45

Other cards in this set

Card 2

Front

how are the particles represented ?

Back

small spheres

Card 3

Front

which states contain particles in a random arrangement ?

Back

Preview of the front of card 3

Card 4

Front

why do substances have different melting points ?

Back

Preview of the front of card 4

Card 5

Front

what does a solid turn to at its melting point ?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all C3 resources »