source : yahoo.com
The quantity of heat required to change the temperature of 1 g of a substance by 1 degree C is is defined as?
A.) a joule.
One joule in everyday life is approximately:
* the energy required to heat one gram of dry, cool air by 1 degree Celsius.
* the energy required to lift a small apple one metre straight up.
* the energy released when that same apple falls one meter to the ground.
* the amount of energy, as heat, that a quiet person generates every hundredth of a second.
* one hundredth of the energy a person can receive by drinking a 1mm diameter drop of beer.
* the kinetic energy of an adult human moving a distance of about a handspan every second.
A specific heat by a definition is the quantity of heat required to change the temperature of 1g (or 1kg) of the specific substance by a certain temperature interval ΔT (which can be 1°). And the unit is [J/(kg*K)] not °C. But if we ignore this more proper answer could be “B.” Because answer “A” talks only about “one gram of dry, cool air” but we talk about substance in general not just dry cool air.
Energy used to be measured in calories.
They were convenient because 1 calorie would heat 1g of water by 1C. With the International System of units (SI) most units ( except mass and length ) were to be named after notable scientists. The unit of energy became the Joule but clumsily this equated to 4.2 joules = 1calorie or 4.186 joules = 1calorie to be exact.
The energy needed to increase the temperature of a gram of water (not any substance) by 1 degree Celsius depends on the starting temperature and is difficult to measure precisely. There have been several definitions of the calorie: 4°C calorie, 15°C calorie, 20°C calorie, Thermochemical calorie, IUNS calorie etc.
The two perhaps most popular definitions used in older literature are the “15 °C calorie” and the “thermochemical calorie”. Since the many different definitions are a source of confusion and error, all calories are now deprecated in favour of the SI unit for heat and energy: the joule (J). Usage of the calorie units continues because of familiarity and habit, a situation akin to the common usage of engine horsepower instead of kiloWatts.
Answered: Specific Heats of Substances… | bartleby – Specific Heats of Substances Substance Specific Heat (cal/g⋅°C) Brick 0.20 Ethanol 0.58 Wood 0.10 Calculate the amount of heat, in calories, that must be added to warm 21.6 g of brick, ethanol, and wood from 21.9 °C to 45.7 °C. Assume no changes in state occur during this change in temperature.The specific heat capacity (c) of a substance is the amount of energy needed to change the temperature of 1 kg of the substance by 1 unit of temperature. Different substances have different specific heat capacities, for example, water has a specific heat capacity of 4…The specific heat of the electrons in a superconductor varies with the absolute temperature ( T ) in the normal and in the superconducting state (as shown in In this experiment, a thin insulating junction is prepared between a superconductor and another metal, assumed here to be in the normal state.
How to Calculate the Amount of Heat Released | Sciencing – fill in the table below describe the stages of photosynthesis.there are two stages of photosynthesis, the light dependent reactions and the calvin cyc … le.Four point charges are at the corners of a square of side a as shown in Figure P15.8. Determine the magnitude and direction of the resultant electric force…Specific heat capacity is the amount of heat energy required to raise the temperature of a substance per unit of mass. The specific heat capacity of a material is a physical property. It is also an example of an extensive property since its value is proportional to the size of the system being examined.
Superconductivity – Transition temperatures | Britannica – specific heat is the amount of heat to be absorbed required to raise a substance 1 degree celsius. And by heat being absorbed, i mean energy, because With a specific heat of 1 calorie/gram, water has the highest specific heat of any common substance; ammonia is an example of a substance…. Substance Specific heat J/g/_C water 4.18 ethyl alcohol 2.44 benzene 1.80 sulfuric acid 1.40 Based on the information in the table, which of the Some questions will include multiple choice options to show you the options involved and other questions will just have the questions and corrects answers.Specific Heat Capacity. Suppose that several objects composed of different materials are heated in The term implies that substances may have the ability to contain a thing called heat. The values for the specific heat of fusion and the specific heat of vaporization are reported on a per amount basis.