"Exploration-Specific Heat Capacity of Matter" Mechanical energy, internal energy and their conversion PPT courseware 3

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"Exploration-Specific Heat Capacity of Matter" Mechanical energy, internal energy and their conversion PPT courseware 3

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Heat The amount of energy change in an object during the heat transfer process can be measured by _____

Specific heat capacity

Definition: ______ absorbed (or released) when the temperature of a unit mass of a substance increases (or decreases) by 1°C (K)

Unit In the International System of Units, the unit of specific heat capacity is ________, and the unit of specific heat capacity is also often written as ________

Properties Specific heat capacity reflects the ________ ability of an object. It is a characteristic of a substance. The specific heat capacity of the same substance is ________, while the specific heat capacity of different substances is generally ________. The specific heat capacity of the same substance is also related to ________

Understand the concept of specific heat capacity

Specific heat capacity is a physical quantity that reflects the ability of a substance to absorb and release heat. It is a characteristic of a substance. Because different substances have different abilities to absorb heat, each substance has its own specific heat capacity. Specific heat capacity is determined by the substance itself. Its size is only related to the type and state of the substance. It has nothing to do with the substance's mass, temperature and temperature change, the amount of heat absorbed or released, its shape, and its placement. A substance with a large specific heat capacity may not necessarily absorb or release much heat. When judging how much heat an object absorbs or releases, the specific heat capacity of the substance, the mass of the object, and the temperature change should also be considered.

Substances can be identified based on their generally different specific heat capacities.

[Example] Which of the following statements about specific heat capacity is correct ()

A. When the temperature and mass of a glass of water and an iron block are the same, the heat absorption capacity is the same.

B. The specific heat capacities of ice and water are the same

C. Cut an iron block into two pieces. The smaller the mass of the iron block, the smaller the specific heat capacity.

D. Different substances with the same mass absorb different amounts of heat when raising the same temperature, so their specific heat capacities are not equal.

Analysis: The key is to correctly understand the concept of specific heat capacity. Specific heat capacity is a characteristic of a substance. It has nothing to do with the mass, volume, temperature, or heat absorbed (or released) of the substance. It is only related to the type and state of the substance. Specific heat capacity represents the heat absorption capacity of different substances. The specific heat capacities of water and iron are different, so the heat absorption capacity is different. Item A is wrong. Although ice and water are the same substance, their specific heat capacities are different due to different states. Item B is wrong. They have different masses. Since the iron blocks belong to the same material, they have the same specific heat capacity, so item C is wrong; according to the definition of specific heat capacity, item D can be judged to be correct.

1. In the following process, the specific heat capacity of the substance changes ()

A. Coal is crushed into coal dust

B. Melt the iron filings and cast them into iron blocks

C. Put the copper block into hot water and take it out

D. Ice melts into water

2. The specific heat capacity of water is greater than that of kerosene. Water and kerosene with equal masses have the same initial temperature. After absorbing equal amounts of heat, the temperature will rise the most: ()

A.Water B.Kerosene

C. There is as much water as kerosene D. It is impossible to judge

3. The following physical quantities reflect the characteristics of matter ()

A.Internal energy B.Temperature

C. Specific heat capacity D. Heat

4. In winter in northern my country, indoor heating is mostly done by letting hot water slowly flow through the radiator for heat dissipation. The reason for choosing water instead of other liquids is ()

A. The density of water is large. B. The specific heat capacity of water is large.

C. The boiling point of water is high D. The mass of water is high

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For more information about the PPT courseware "Mechanical Energy Internal Energy and Its Transformation Exploring the Specific Heat Capacity of Matter", please click the Mechanical Energy Internal Energy and Its Transformation ppt Exploring the Specific Heat Capacity of Matter ppt tag.

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Update Time: 2024-09-22

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