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What substances have the lowest heat capacity?
Plastics.
What are the three changes that causes heat in substances?
1. melting 2.boiling 3.freezing
Why must substances be touching in order from conduction to occur?
Conduction is the transfer of heat between substances due to direct contact. When substances are touching, their particles can transfer kinetic energy (heat) by colliding with each other, causing the heat to flow from the warmer substance to the cooler one. Without direct contact, there is no medium for the transfer of heat energy to occur.
What group of substances is arranged in order of decreasing specific hear values?
Substances can be arranged in order of decreasing specific heat values based on their ability to absorb heat without a significant change in temperature. Generally, water has one of the highest specific heat values among common substances, followed by substances like ethanol, wood, and metals such as aluminum and iron. The specific heat varies widely among different materials, so the exact order will depend on the substances being compared.
Does aluminium swell?
No, although it does expand with heat as do most substances.
What are the substances that has low specific heat capacity?
Substances with low specific heat capacity include metals like aluminum and copper, as well as gases like helium and hydrogen. These substances heat up and cool down quickly compared to substances with higher specific heat capacities.
What is the Difference between heat labile and heat stable substances?
Heat labile substances are destroyed or corrupted by heat, for example many proteins lose their structure (unfold) at temperatures considerably lower than boiling point. Heat stable substances maintain form and function at higher temperatures. Heat stable/labile properties are often used in biochemistry to distinguish organic molecules such as enzymes, cell proteins and toxins.
What are the differences between conduction convection and radiation?
Conduction-happens when heat moves from one object to another through direct contact Radiation-happens when energy ,such as heat, moves in waves between one object and another Convection-happens when matter carries heat from one place to another
Metallic substances have higher specific heat capacities than nonmetallic substances?
Metallic substances have higher specific heat capacities than nonmetallic substances because metallic bonds allow for more energy to be absorbed without a large increase in temperature. This means that metallic substances can store more heat energy per unit mass compared to nonmetallic substances.
What effect does the specific heat have on cooling?
The specific heat of a substance affects the amount of thermal energy required to cool it. Substances with higher specific heat values require more energy to cool down compared to substances with lower specific heat values. This means that substances with higher specific heat values will cool down more slowly than substances with lower specific heat values.
Why do substances with large heat capacities make good heat storing substances?
Because of large heat capacities temperature rise will be very low so large amount of heat can be stored.
Why same amount of heat supplied to same amount of different substances does not produce the same increase in temperature?
There is a formula in physics ΔQ=m*c*ΔT, where m is the mass of the substance you are heating, ΔQ is the heat you supply to the substance, c is the specific heat which has a different value for different substances and ΔT is the change in temperature. If your substances are different and they have the same mass then by supplying the same amount of heat the change in temperature will be different.
Can heat transfer occur when two substances are the same temperature?
No, heat transfer occurs due to a temperature difference between two substances. If both substances are at the same temperature, there is no temperature gradient to drive heat transfer, so no heat transfer will occur.
Bad conductor of heat?
Substances that Don't have the capacity to carry heat
What substances that heat and cool quickly have a high or low specific heat?
A substance that has a low specific heat needs less heat to increase its temperature. In other words under a constant heat flux it will heat or cool more quickly than the higher specific heat substances.
What are some specific heat problems that can arise when comparing two substances?
When comparing two substances, specific heat problems can arise if the substances have different specific heat capacities. This can lead to inaccuracies in calculations involving heat transfer or temperature changes between the substances. It is important to account for these differences to ensure accurate results in thermodynamic analyses.
When chemical energy is converted into thermal energy what happens?
The chemicals split from each other to become more elemental substances, while giving off a lot of heat
