All of the statements are true for spontaneous reactions except: a) the reaction rate is determined by the value of δg. b) if the enthalpy change is unfavorable, they occur at a high temperature. c) the value of δg is unaffected by a catalyst. d) the value of δg is less than zero. e)they are said to be exergonic.

A is false

Explanation:

A is false.

● activation energy affects the rate of a reaction and catalyst affects the rate of reaction too

ΔG (change in free energy) tells if a reaction is spontaneous or not

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents