Calculate e and determine whether the process is endothermic or exothermic for the following cases:
(a) q = 0.763 kj and w = -840 j.
(b) a system releases 66.1 kj of heat to its surroundings while the surroundings do 44.0 kj of work on the system.

a) ∆E=-0.077KJ (exothermic)

b) ∆E = 110KJ (endothermic)

Explanation:

a) ∆E = q + w

q= 0.763 KJ

w= -840J = -0.840 KJ

∆E = 0.763-0.840 = - 0.077KJ

Exothermic reaction are those reactions that proceeds with the release of heat to the surroundings and Energy is negative in exothermic processes.

b)/∆E = q+w

q= 66.1KJ, w=44KJ

∆E = 101KJ

And it is endothermic

When work is done on a system, the international energy increases.

a) E= -0.077KJ Exothermic

b) E= -22.1KJ Exothermic

Explanation:

a) change internal energy E = q+ w

Since q= 0.763KJ and w=-840j= -0.84KJ

E= 0.763kj - 0.84kj

E= -0.077KJ

The process is exothermic since it releases heat to the surrounding i.e E is negative.

b) q= - 66.1KJ negative because it's heat released to the surrounding

w= 44.0KJ work done on the system by the surrounding.

E= q+w

E= -66.1KJ + 44.0KJ

E= -22.1KJ

The process is exothermic because the value of E is negative.

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samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.