How many joules of heat are required to heat 125 g aluminum from 19.0°c to 95.5°c?

The amount of heat required is 8625.4 J

Explanation:

To calculate the heat required, we use the equation:

where,

q = heat required = ?

m = mass of aluminium = 125 g

c = specific heat capacity of aluminium = 0.902 J/g.°C

= change in temperature =

Putting values in above equation, we get:

Hence, the amount of heat required is 8625.4 J

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e