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The melting point of a substance is based upon the polarity of the bonds that make up the substance. In water, the O-H bond has a difference in electronegativity of 1.4 (Pauling's Scale) and in ammonia, the N-H bond has a difference in electronegativity of .9. Therefore, it takes more energy to break apart the O-H bond because the polarity is so great, and this is why it has a higher melting point than ammonia.
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∙ 15y ago
The melting point of ammonia is lower than that of water because ammonia molecules are lighter and have weaker intermolecular forces compared to water molecules. This results in ammonia being a gas at a lower temperature than water, making its melting point lower.
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How do you think the melting point of salt water compares to that of pure water?
The melting point of saltwater is lower than that of pure water. This is because the presence of salt disrupts the hydrogen bonds between water molecules, making it harder for the water to freeze.
What has the lowest melting point water timber or plastic?
Of the three options, plastic has the lowest melting point. Different types of plastics have varying melting points, but in general, they melt at lower temperatures compared to both water and timber.
What is the melting point of water at 5000 meters?
The melting point of water at 5000 meters is slightly higher than at sea level due to the lower atmospheric pressure. At this altitude, water will freeze at around 0.2 degrees Celsius.
How does water affect the melting temperature of a mineral?
Water can lower the melting temperature of a mineral by acting as a flux or catalyzing agent, allowing atoms to move more freely and reducing the energy required for melting. This can lead to the formation of new minerals or phases at lower temperatures than would occur without water present.
What effect does sugar have on ice?
yes but not to the same extent. solutes prevent ice formation by lowering the melting point of water. sugar water does have a lower melting point than pure water but it is not as effective as simpler salts because it is less soluble. (conc. of solutes is related to the melting point)
What is the meaning of melting point of ammonia and boiling point of ammonia?
The melting point of ammonia is the temperature at which solid ammonia turns into liquid ammonia. This occurs at -77.7 degrees Celsius. The boiling point of ammonia is the temperature at which liquid ammonia turns into a gas. This happens at -33.34 degrees Celsius.
When ethylene glycol is added to water the melting point of water is?
Ethylene glycol is antifreeze. The mixture has a lower melting point than pure water.
How do you think the melting point of salt water compares to that of pure water?
The melting point of saltwater is lower than that of pure water. This is because the presence of salt disrupts the hydrogen bonds between water molecules, making it harder for the water to freeze.
Why does plastic have a lower melting point than water?
Water can't melt!!!
What are the boiling and melting point's of salty water?
That depends on how much salt is dissolved in the water. Generally, the boiling point will be higher than for pure water, and the melting point will be lower than for pure water.
How does sprite melt fast?
It has a lower melting point than water.
Does ammonia evaporates when water is boiled?
Yes, ammonia is a volatile compound and will evaporate when water is boiled. This is because ammonia has a lower boiling point compared to water, so it will evaporate along with the water vapor.
Lower the melting point of wax?
To lower the melting point of wax, you can consider adding a small amount of mineral oil or vegetable oil to the wax before melting it. This will decrease the overall melting temperature of the wax. Alternatively, you can mix the wax with a lower melting point wax to create a blend with a reduced melting point.
When are oil baths and water baths used respectively for melting point determination?
Oil baths are typically used for high-temperature melting point determinations, where the sample needs to be heated to a temperature above the boiling point of water. Water baths, on the other hand, are used for lower temperature melting point determinations, as water has a lower boiling point compared to oil.
Which is colder frozen water or frozen salt water at melting points?
The freezing point of salted water is lower compared with the freezing point of pure water. So when melting frozen salt water is colder.
How does melting point change as the water content of rocks increases?
As the water content of rocks increases, the melting point typically decreases. This is because the presence of water lowers the melting point of minerals in the rocks by acting as a flux that promotes melting. The addition of water creates a eutectic point where the rock will begin to melt at a lower temperature.
A wet rock generally melts at a lower temperature than a dry rock true or false?
True. Water has a lower melting point than most rocks, so when a rock is wet, the presence of water can lower the overall melting point of the rock.
