List 2 observations for the reaction between: Chromium(III) nitrate solution and magnesium ribbon
silver/grey solid dissolves | blackish/grey/silver solid forms | solution becomes less green/colourless
Oops!
Check
Okay!
Check
banana
Go to last place!
Oops!
shark
Other team loses 15 points!
Okay!
rocket
Go to first place!
Okay!
lifesaver
Give 25 points!
Oops!
20
Give the 4 characteristics of Chemical Equilibrium
only in a closed system | rate of forward reaction = the rate of reverse reaction | no change in macroscopic properties | can be attained from either direction
Oops!
Check
Okay!
Check
15
Explain how temperature affects the rate of reaction
more particles have E > Ea AND increase in collision frequency
Oops!
Check
Okay!
Check
15
Explain how detergents are able to remove grease from a surface by referring to the intermolecular forces present.
(mentions IMF between det and water; IMF between det and grease; mentions agitation and being washed away)
Oops!
Check
Okay!
Check
seesaw
Swap points!
Oops!
gift
Win 15 points!
Okay!
gift
Win 20 points!
Okay!
baam
Lose 20 points!
Oops!
10
Name this molecule
2,3-dimethylbut-2-ene
Oops!
Check
Okay!
Check
15
Draw the structure of a simple triglyceride
(triglyceride structure; hydrophobic chains represented by R)
Oops!
Check
Okay!
Check
15
List 2 observations for the reaction between: Iron filings and dilute hydrochloric acid
colourless, (odourless) bubbles /effervescence/gas | silver/grey solid dissolves | (pale) green solution formed
Oops!
Check
Okay!
Check
10
Identify this amino acid
cysteine
Oops!
Check
Okay!
Check
10
Identify this amino acid
valine
Oops!
Check
Okay!
Check
15
What is a buffer solution?
A solution that resists pH change when a small amount of strong acid/base is added to it
Oops!
Check
Okay!
Check
15
State 2 reasons why galvanic cells need a salt bridge.
maintains charge neutrality | completes the circuit | allows transfer of ions between two half-cells | prevents polarisation.
