*urgent*

substances dissolve through three processes:

i. ionization

ii. dissociation

iii. dispersion

which lists the dissolving processes that change the identity of a substance?

a) ii and iii
b) i
c) i and ii
d) i and iii
e) i, ii, and iii

B) IONIZATION

Explanation:

Ionization occur when substance gain or lost the electron and form the ions.

when substance are changed into ions their identity changed.

So we can say that it is a chemical change and substance lost their identity.

For example:

The polar covalent compound HCl ionized and gives H⁺ and Cl⁻ ions. These ions have different properties from parent compound HCl.

While in case of dissociation identity remain same. Consider the dissociation of ionic compound they just dissociate into respective ions . This is a physical change and identity of substance remain same.

For example:

Ionic compound sodium chloride dissociate into sodium(Na⁺) cation and chloride(Cl⁻) anion.

while in case dispersion particles are dispersed into continuous phase without losing their identity.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml