Which of the following statements is true? a) The rate constant does not depend on the activation energy for a reaction where the products are lower than the reactants. b) A catalyst raises the activation energy of a reaction. c) Rate constants are temperature dependent.
Rate constants are temperature dependent.
Reaction rate is used to quantify the rate of chemical reaction. There is a relationship between the reaction rate and the half-life of the reaction and the Gibbs free energy of activation, and the reaction rate is temperature dependent according to the equation.
For a reaction shown below
a A + b B ⇒ c C
The rate of reaction of the reaction is given by
where k(T) is the reaction constant, which is seen to be dependent on the temperature of the reaction.
Also, k(T) is numerically equal to
r = reaction rate
A = pre exponential factor
= Activation energy
R = gas constant
T = temperature
and m and n are experimentally determined partial orders in [A] and [B]
answer is: c. the experiment shows that the red substance experienced a chemical change.
this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.
this is example of chemical decomposition.
chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.
chemical decomposition is opposite of chemical synthesis.