Chem Notebook COmplete

Chemical Concepts:
The chemical concepts involved in this question are “reaction rate” and the “catalyst”. When it comes
to reaction rate, it is described as the measurement and relationship of time and the amount of
products formed by the reactants in a reaction. There are many factors that contribute to the
fluctuation of this type of measurement and those are temperature, concentration, the presence of a
catalyst, and particle size. Increasing the temperature of the reaction also increases average kinetic
energy making the possibility of colliding particles higher which in turns increases the rate of which
the products are formed. The higher the concentration the more particles are able to collide also
changing the reaction rate, much like in a crowded room you are more likely to bump into someone
than if you were in a room with only a couple of other people. The catalyst which has already been
mentioned, decreases the activation energy of the reaction, speeding it up, and causing the reaction
rate to increase. Finally, particle size which isn’t mentioned in this question but is connected with the
subject and just means that the bigger the particle the more surface area it has, meaning that there is
more space for moving particles to collide and form new products.
3 For the reaction
A + (aq) + B — (aq) → AB (s)
increasing the temperature increases the rate of the reaction. Which is the best explanation for this
happening?
A The pressure increases, which in turn increases the production of products.
B The concentration of reactants increases with an increase in temperature.
C The average kinetic energy increases, so the likelihood of more effective collisions between ions
increases.
D Systems are more stable at high temperatures.
Chemical Concepts:
The chemical concepts involved in this question are “collision theory” and “kinetic energy”. The
collision theory is the concept that units of matter such as ions, molecules, and atoms can form new
products if they collide with other units of matter with a specific force and position caused by their
speed and direction of travel. The concept of kinetic energy dwells in the understanding of the
movement of particles based on the amount of energy they contain, it is closely involved with
temperature. The more kinetic energy a particle has the faster it moves and the force of impact it
applies while colliding with another particle increases the chances of new products to be formed.
4 Which statement explains why the speed of some reactions is increased when the surface area of
one or all the reactants is increased?
A increasing surface area changes the electronegativity of the reactant particles
B increasing surface area changes the concentration of the reactant particles
C increasing surface area changes the conductivity of reactant particles
D increasing surface area enables more reactant particles to collide
Chemical Concepts:
The chemical concept associated with this question is “particle size” and how it affects reaction rate.
Particle size quite blatantly is referred to as the amount of surface area a particle, mainly the reactant,
has. This has a direct correlation with reaction rate because the greater the surface area a particle
has the more likely it is to collide with another reactant to form a new product. The reason behind this
is that collisions occur at the surface of particles.