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Is it true that it takes a lot of heat to melt a substance with a low melting point?
Wiki User
∙ 6y ago
See the expert answer above for a specific answer to the question. However, if you mean 'what is a low melting point' then it means that the temperature at which the substance becomes a liquid is reasonably easy to get to, so you have to provide less heat to get to the melting point than you would if it were high.
Wiki User
∙ 6y ago
Wiki User
∙ 6y agoThe heat required to melt a substance is related to the specific heat of the substance, as well as its mass - NOT to its melting point.However, this assumes that the object is already at its melting point - it may require some extra heat to raise temperature up to the melting point, first.
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How does melting differ from freezing?
For any given substance the melting point and the freezing point are the SAME temperature. However, if the substance is increasiung in heat to move from solid to liquid then it is the MELTING POINT. If that same substance is losing heat to move from liquid to solid then it is the FREEZING POINT. Similarly, when moving from liquid to gas ity is the boiling point , and when moving from gas to liquid it is the condensing point.
Do elements melt?
I'm assuming you are talking about sub-atomic particles. The act of melting cannot be applied to particles because melting refers to a change of state of a substance. Substances, whether they be compounds or elemental, are a collection of atoms. These atoms, can be of 3 different states, depending on their temperature. If below the particular substance's melting point, it is solid. Between the melting and boiling point, the substance is liquid, and above the boiling point, the substance is gaseous. The state of the substance refers to the total amount of energy within the substance. Heat is energy, and melting a substance is only adding energy to it. the substance, on a molecular level, does not change when melting occurs. Therefore, melting a particle cannot occur, only energy can be added, which increases movement of the particles.
Why two different substances have different melting point?
It depends on the density of the substance. The higher the density, the higher the melting point and vise versa.
What happends at the melting point?
At the melting point a SOLID turns to a LIQUID. (Increasing temperature). At the same temperature , when a liquid turns to solid it is referred to as FREEZING POINT. NB At the boiling point a LIQUID turns to a GAS. (Increasing temperature). At the same temperature , when a gas turns to liquid it is referred to as CONDENSING POINT. NNB Carbon Dioxide, a gas, moves directly to a solid(dry ice) . This is called the SUBLIMATION POINT.
Under what conditions does a substance change state?
It depends on the substance. Some melt when heated (ice), some evaporate under heat (water) and some become solid when chilled (water into ice). It would be called their melting point, the freezing point and the evaporating point.
Why does the temperature become constant at the point of melting till the whole substance of a solid melted?
That happens because any heat that is added to that melting material will be used to cause further melting, until there is nothing left to melt, at which point the added heat can raise the temperature. A solid melts at its melting point; it does not get hotter than the melting point without melting, that's why it is the melting point.
Under what conditions heat can be given to a substance without raising its temperature?
If the substance is in solid condition and at the melting temperature, heat can be given without rising the temperature. Then the substance melts and all the heat will be used in the melting process. Also when the substance is at the boiling temperature you can add heat without rising the temperature. At that point the heat is used to vaporate the substance.
If a sample contained 1 gram of pure substance A and another test tube contained 4 grams of pure substance A how would the melting point differ and how would the experiment differ?
The melting point is independent of the quantity. What changes is the amount of heat which must be supplied.
Does the melting point of aluminum change with the thickness?
The melting point of any given substance (such as aluminum) has nothing to do with the thickness or shape of the material being melted. It will melt at the same temperature. But it does require more heat in order to heat a thicker piece of aluminum to its melting point.
If a substance is not at its melting or boiling point as the heat content of a sample of matter increases what happens?
As the heat content increases, the temperature of the substance will rise. However, if the substance is not at its melting or boiling point, it will not undergo a phase change. Instead, its temperature will continue to increase until it reaches its melting or boiling point, at which point a phase change will occur.
Why is the meting and freezing point of a substance the same?
Melting is simply the reverse of freezing. The secret to it is that it takes quite a bit of heat movement to make a substance change from the freezing point. Heat moves out of substance in freezing, and heat moves into a substance to make it thaw.
How does melting differ from freezing?
For any given substance the melting point and the freezing point are the SAME temperature. However, if the substance is increasiung in heat to move from solid to liquid then it is the MELTING POINT. If that same substance is losing heat to move from liquid to solid then it is the FREEZING POINT. Similarly, when moving from liquid to gas ity is the boiling point , and when moving from gas to liquid it is the condensing point.
What temperature at which a substance changes from solid to liquid is called its?
It is the boiling point of the substance.
How does temperature vary when a substance changes from solid to liquid?
When heat is applied to a solid, its temperature rises until it reaches the melting point of the substance. As the heat application continues, the temperature remains constant at the melting point as all of the heat is consumed in changing the state of the substance from solid to liquid. It is only after the conversion to liquid is complete that the temperature of the substance again starts to rise as long as heat is still being applied.
What is misleading with the term melting point?
The term "melting point" is misleading because the melting point is dependent on both the amount pressure and heat applied. At 1 atm (atmosphere), the melting point is called the "normal melting point." The amount of heat necessary to melt a substance at it's normal melting point is consistent with the substance's generally accepted melting point; like 0ºC for H2O. When the amount of pressure is changed, the amount of heat necessary to melt the substance also changes, therefore completely altering the melting point of said substance. For example, 1 atm is usually found at sea level, so the amount of heat having to be added to a substance to melt it at that altitude is equal to it's normal melting point. When attempting to melt the same substance at higher altitudes, (higher altitudes will contain more than 1 atm of pressure) the substance will not require as much heat as it did while melting at sea level. As previously mentioned, H2O converts from ice into water at 0ºC while under 1 atm of pressure (normal melting point). However, in an altitude of 10,000ft the melting point of H2O may change to something like -6ºC opposed to the generally accepted 0ºc. Tl;dr- The term "melting point" is misleading, because it leads us to believe that the melting point will always be consistent in a substance. However, in reality the "melting point" is only consistent to a given amount of pressure the substance is undergoing. *atm (atmosphere) is a unit of measurement to convey a given amount of pressure. It's usually is used to convey the amount of pressure in altitudes.
When 1 kg of a substance changes from solid to liquid at its melting point it must absorb an amount of heat equal to which of the following?
It must absorb heat equivalent to its specific latent heat (Kilojoules per kilogram).
What is a similarity between heat fusion and heat solidification?
When changing from a solid to a liquid, melting, the heat absorbed is called the heat of fusion. When the reverse takes place, freezing, it is called the heat of solidification. For a single substance they are the same.
