The Atmosphere UNIT 2

I quiz i put together using some of the questions in the OCR salters B revsion guide , 

hope it helps guys :)

?
Why is diamond the hardest naturally occurring substance?
Strong intermolecular covalent bonds form a giant and highly symmetrical 3D network, which is very difficult to break.
1 of 10
Why is CO2 a gas at room temp but SiO2 a solid?
CO2 has weaker intermolcular bonds that SiO2 , they require less energy than SiO2 and there is enough energy at room temp. to do this.
2 of 10
Why is CO2 soluble and SiO2 is not?
CO2 is polar, hydrogen bonds form between hydrogen atoms in the water and lone pars on oxygen atoms in CO2; water can not break apart the giant network structure of SiO2.
3 of 10
What type of intermolecular bonds are there in CO2 molecules?
Instantaneous dipole-induced diapole bonds and permanent dipole-permanent dipole bonds exist.
4 of 10
What is the energy of a photon of frequency 3.8 x 10^13 Hz ?
2.52 x 10 ^-20 J
5 of 10
What is meant by the word 'quantised'?
Only certain fixed values are possible
6 of 10
What are the three stages of a radical chain reaction?
Initiation, propagation, termination
7 of 10
What is a chain reaction?
A chain reaction continues to produce radicals which can go on to react with other molecules
8 of 10
Define the term activation enthalpy.
The minimum energy required by a pair of colliding particles before a reaction will occur.
9 of 10
What does dynamic equilibrium mean?
A reversible reaction in a closed system in which the rate of the forward reaction is equal to the rate of the reversible reaction.
10 of 10

Other cards in this set

Card 2

Front

Why is CO2 a gas at room temp but SiO2 a solid?

Back

CO2 has weaker intermolcular bonds that SiO2 , they require less energy than SiO2 and there is enough energy at room temp. to do this.

Card 3

Front

Why is CO2 soluble and SiO2 is not?

Back

Preview of the front of card 3

Card 4

Front

What type of intermolecular bonds are there in CO2 molecules?

Back

Preview of the front of card 4

Card 5

Front

What is the energy of a photon of frequency 3.8 x 10^13 Hz ?

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 Bonding & shapes resources »