Is the following reaction classified as endothermic or exothermic? Why? 2012(8) + 702(g) + 130 kcal -> 201207(g)
а
endothermic, because the heat is given as a reactant.
endothermic, because the heat is given as a product.
exothermic, because the heat is given as a reactant.

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

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

i think is conclusions.i think so