Science definitions

?
  • Created by: Jack
  • Created on: 05-02-17 20:09
Fractional distillation (C1)
#Crude oil is heated #it boils and evaporates #The vapours travel up the fractionating column #As they get higher, it is cooler #So they condense #At different boiling points bcause they are different sizes #so they can be seperated
1 of 6
Continental drift occurs because.... (C1)
#The earths crust is split into tectonic plates #the heat released from radioactive reactions within the core #causes convection currents within the mantle #that move the tectonic plates
2 of 6
Metallic structure (C2)
#Giant structure #metal atoms lose all outer shell electrons to become positive ions #electrons form a sea of delocalised electrons #electrostatic attraction between the positive ions and negative sea of delocalised electrons form strong bonds
3 of 6
Structure and bonding in sodium chloride (C2)
#Giant structure #sodium atoms lose the electron from their outer shell to becomes Na+ #Chlorine atoms gain an electron to become Cl- #Electrostatic attraction between the possitive and negative ions crates strong bonds.
4 of 6
Reactivity in group 1 metals (C3)
#Metals are more reactive as you go down the group #because the outer shell electron is further from the nucleus #so the attraction between the possitive protons and negative electrons is weaker #so the outer shell is more easily lost.
5 of 6
Conditions for Harber process (C3) The pressure is 200atm because a high prerssure favours the forwards reaction because it turns 4 molecules into 2. if the pressure was any higher it would be dangerous and too expensive.
#Temp-450*C which is a comprimise between high rate an high yield. #if the temp was any higher it would favour the backwards reaction becasue it is endothermic #if the temp was any lower there would be less successful collisions rate would be low too
6 of 6

Other cards in this set

Card 2

Front

#The earths crust is split into tectonic plates #the heat released from radioactive reactions within the core #causes convection currents within the mantle #that move the tectonic plates

Back

Continental drift occurs because.... (C1)

Card 3

Front

#Giant structure #metal atoms lose all outer shell electrons to become positive ions #electrons form a sea of delocalised electrons #electrostatic attraction between the positive ions and negative sea of delocalised electrons form strong bonds

Back

Preview of the back of card 3

Card 4

Front

#Giant structure #sodium atoms lose the electron from their outer shell to becomes Na+ #Chlorine atoms gain an electron to become Cl- #Electrostatic attraction between the possitive and negative ions crates strong bonds.

Back

Preview of the back of card 4

Card 5

Front

#Metals are more reactive as you go down the group #because the outer shell electron is further from the nucleus #so the attraction between the possitive protons and negative electrons is weaker #so the outer shell is more easily lost.

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Model answers resources »