How much heat is lost when a 692 g piece of aluminum cool from 176°C to 85°C? The specific heat of aluminum is 0.125 cal/g°C.

Heat loss is -7871.5J

Explanation:

Mass = 692g

Initial temperature (T1) = 176°C

Final temperature (T2) = 85°C

Specific heat capacity of Al = 0.125J/g°C

Heat energy = ?

Q = mc∇t

Q = heat energy

M = mass of substance

C = specific heat capacity of substance

∇t = change in temperature of substance = T2 - T1

Q = mc∇t

Q = 692 × 0.125 × (85 - 176)

Q = 86.5 × -91

Q = -7871.5J

The heat loss is -7871.5J or -7.87kJ

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

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answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.