An unknown substance has a mass of 11.9 g . when the substance absorbs 1.071×102 j of heat, the temperature of the substance is raised from 25.0 ∘c to 45.0 ∘c . what is the most likely identity of the substance?

The most likely identity of the substance is iron.

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q = Heat absorbed= Joules

m= mass of substance = 11.9 g

c = specific heat capacity = ?

Initial temperature of the water = = 25.0°C

Final temperature of the water =  = 45.0°CChange in temperature ,

Putting in the values, we get:

The specific heat of 0.45 is for iron and thus the substance is iron.

i believe it is b. what was the cause of the big bang

hope this !

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.