A well-insulated stainless-steel bar has a 50 cm length and cross-sectional area of 3.5 cm². One of its ends is maintained at a temperature of 115 ºC while its other end is kept at a temperature of 30 ºC. If the bar is in steady rate condition, find the temperature at a distance of 15 cm from the end that is at 115 ºC. A. 104.5 ºC
B. 104.5 K
C. 89.5 ºC
D. 89.5 K

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

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )