Revision for Chemistry 2a

What does the mass number represent?
The total number of protons and neutrons
1 of 23
What does the atomic number represent?
The number of protons
2 of 23
What is a compound?
Atoms from two or more elements that are chemically bonded
3 of 23
Define the term isotope
A different atomic form of the same element, which has the same number of protons but a different number of neutrons
4 of 23
What happens during ionic bonding?
Atoms lose or gain electrons to form charged particles (ions) which are then strongly attracted to each other due to their opposite charges
5 of 23
Describe the structure of a crystal of sodium chloride
It is one giant ionic lattice, so the salt crystals tend to be cuboid in shape
6 of 23
List the main properties of ionic compounds
High melting point, high boiling point, conduct electricity when molten or aqueous, and dissolve easily in water
7 of 23
When type of ion do elements from group 1 form?
Positive ions with +1 charge
8 of 23
When type of ion do elements from group 7 form?
Negative ions with -1 charge
9 of 23
What is covalent bonding?
When atoms share electrons in their outer shells to gain a full outer shell
10 of 23
What are the two types of covalent substance?
Simple covalent structures and giant covalent structures
11 of 23
List three properties of metals
1. Can be bent and shaped 2. Good conductors of heat 3. Good conductors of electricity
12 of 23
Explain why alloys are harder than pure metals
Different elements have different sized atoms. So when another metal is mixed with a pure metal, the new metal atoms will distort the layers of metal atoms, making it more difficult for them to slide over each other
13 of 23
Give an example of a 'smart' material and describe how it behaves
Nitinol is a shape memory alloy, so if you heat it above a certain temperature it goes back to a 'remembered' shape
14 of 23
What are nanoparticles?
They are really tiny particles about 1-100 nanometres across
15 of 23
Give two different applications of nanoparticles
They are sued in cosmetic products (e.g. suncream) and and they can also help make new industrial catalysts
16 of 23
Explain the difference between thermosetting and thermosoftening polymers
Thermosetting polymers have crosslinks which hold the polymer chains firmly together, whereas thermosoftening polymers don't have crosslinks so the polymer chains are free to slide over each other
17 of 23
What is the relative atomic mass
It is the same as the mass number
18 of 23
Define relative formula mass
It is the sum of all the relative atomic masses of the elements within a compound
19 of 23
What is the link between moles and relative formula mass?
One mole of a substance is the relative formula mass in grams
20 of 23
What is an empirical formula?
It is the formula of a compound
21 of 23
Name three factors that can reduce the percentage yield of a reaction
1. The reaction is reversible 2. Filtration 3. Unexpected reactions
22 of 23
List three advantages of using machines to identify elements and compounds
1, Very sensitive (can detect the tiniest amounts of substances) 2. Very fast and tests can be automated 3. Very accurate
23 of 23

Other cards in this set

Card 2


What does the atomic number represent?


The number of protons

Card 3


What is a compound?


Preview of the front of card 3

Card 4


Define the term isotope


Preview of the front of card 4

Card 5


What happens during ionic bonding?


Preview of the front of card 5
View more cards


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all C2 resources »