(a) Define specific heat. Specific heat is defined as the quantity of heat required to raise the temperature of 1 gram of a substance__________ kelvin. (b) Explain what is meant by saying the specific heat of water is 4.18 J/g·K. ___________ gram(s) of water must absorb 4.18 J/g·K of heat to raise its temperature_________kelvin. (c) Assuming the specific heat of a substance is constant, what will happen to the quantity of heat transferred if the following occur. (i) We wish to heat more than 1 g of water 1 K. The quantity of heat transferred will (increase or decrease) (ii) We wish to heat a 1 g mass of water to 2 K rather than 1 K. The quantity of heat transferred will (increase or decrease) Specific heat is defined by the equation Cs = q mΔT where Cs is the specific heat, q is the quantity of heat transferred, m is the mass of the substance in grams, and ΔT is the temperature change.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
(a) Define specific heat.
(b) Explain what is meant by saying the specific heat of water is 4.18 J/g·K.
(c) Assuming the specific heat of a substance is constant, what will happen to the quantity of heat transferred if the following occur.
(ii) We wish to heat a 1 g mass of water to 2 K rather than 1 K.
Specific heat is defined by the equation
| q |
| mΔT |
where Cs is the specific heat, q is the quantity of heat transferred, m is the mass of the substance in grams, and ΔT is the temperature change.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
