Download 4 - Ms McRae`s Science

Answers Chapter 12 Worksheet 1-1 Kinetics
4.
Colorimeter = an instrument to measure colour intensity and equate it to
concentration – you will be building one
Cannot do this one yet as you haven’t studied equilibrium.
5.
Fe2+(aq) + MnO4-(aq) 
Versus
C2O42-(aq) + MnO4-(aq) 
Even though the C2O42- ion is at a higher concentration and the reaction is taking
place at a higher temperature (both factors usually result in a higher rate of
reaction) the reaction takes longer indicating a lower rate of reaction and must be
due to the nature of the reactants. Surface area is not a factor as the reactants are
all aqueous solutions. No catalyst is indicated.
6.
lower
7.
[HCl]
time
-beginning of reaction has a high concentration of HCl
-conc of HCl decreases rapidly at first and then tapers off as HCl is used up and
fewer collisions take place
8.
–the use of the catalyst manganese dioxide to breakdown hydrogen peroxide for
the foaming monster demo because it’s fun
-in the production of any necessary chemical
-the breakdown of NOx gases produced by combustion in your car engine—your
car uses solid metal (Pt and Pd) in the catalytic converter to speed up this
breakdown so fewer noxious(haha) chemicals are released into the air
-Ni metal solid catalyst to turn vegetable oil into margarine (unfortunately you
end up with trans fats too)
9.
-herbicides and pesticides interfere with the metabolisms of plants and animals
-the use of preservatives to slow down the rotting of food caused by chemicals
released by bacteria
-natural poisons plants and animals release for defense or the killing of prey
-antibiotics prevent bacteria from reproducing themselves
↓-lots and lots of drugs man that interfere with metabolic processes
10.
-decrease heat energy by the water absorbing heat energy and vaporizing
-“blankets the fire to prevent O2 from colliding with the fuel
11.
a) r = 0.11 g Zn/s
b) r = 0.05 g Zn/s
c) ↓ in concentration of HNO3 as the reaction takes place
therefore ↓ number of collisions between HNO3 and Zn
12.
a)yes bec an increase in the temperature of the HCl will increase the velocity of
the reactant particles which will increase the number of collisions AND increase
the number of effective collisions i.e. ones that have sufficient energy (activation
energy) to react
b) skipping this one for now until equilibrium
c)yes, bec an increase in the surface area of the iron will increase the number of
collisions btw the iron and the HCl
13.
a) yes bec an increase in the temperature of the reactants will increase the rate by
increasing the number of effective collisions
b) no, none of the reactants or products are in a gaseous state and only gases are
affected by pressure changes
c) yes bec an increase in the concentration of the NaOCl will increase the number
of collisions btw the NaOCl particles
14.
r = 0.002 mol NO/s