Compare the type of change that occurs when a substance melts and when a substance is set on fire. use complete sentences to justify the type of change that occurs.

When iron rusts there is a chemical change known as oxygenation. When a substance freezes it's called a physical change because it's only changing the state of matter.

Hope this helps :-)

FYI remember to always write your responses for school on your own words so you dont possibly get plagiarism or in trouble for proof of cheating ^_^

Explanation:

A physical change is defined as the change that causes no change in chemical composition of a substance. And, during a physical change temperature of a substance remains the same.

For example, melting of ice is a physical change and during this change latent heat of fusion, that is, heat required to convert 1 g of a solid substance into liquid state will keep the temperature constant unless and until all the solid changes into liquid.

On the other hand, a change in which a new product is formed due to change in chemical composition of the reacting species is known as a chemical change. During a chemical change, there will occur change in temperature.

So, when a substance is set on fire then there will occur change in temperature of the substance.

Hence, it means it is a chemical change.

When iron rusts there is a chemical change known as oxygenation. When a substance freezes it's called a physical change because it's only changing the state of matter.

Hope this helps :-)

FYI remember to always write your responses for school on your own words so you dont possibly get plagiarism or in trouble for proof of cheating ^_^

Read more on -

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole