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A transparent crystalline substance is found to be rather soft and have a low melting point what type of solid is this substance?
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∙ 16y ago
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∙ 16y ago
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How do impurities affect the melting point of compound?
effects that impurities have on melting point iof a pre compound. I learned that it is because the impurities "defect" the crystal lattice of the compound. A pure compound is a structure of high molecular symmetry. An impurity is rather assymetrical, or is a poorly organized structure. If the impurites are present with the pure compound, the melting point will deviate because melting point is also dependent on the high symmetry and organization of molecular structures,
What happens when syrup hardens over millions of years?
Under the proper conditions, tree resin (rather than syrup or sap) will harden into a "fossilized" (it is not a true fossil as it has not been mineralized) substance called amber, a relatively solid but often still transparent polymerized form.
1 iu is equal to how many mg?
The international unit varies according to the substance. An IU is the amount of something that is needed to produce an effect which has been agreed upon as a standard. So, 1000 IU of Vitamin D has a different mass than 1000 IU of Vitamin C.
During a change of state why doesn't the temperature of a substance change.?
It's easier to understand if we talk about it in terms of heating, but it's the same reason for cooling, except backward.Crudely speaking, all the energy is being used to overcome the attractive forces between the atoms or molecules of the substance, rather than going directly into kinetic energy. Since temperature is a measure of the average kinetic energy, the temperature will not rise until the substance has fully changed state. At that point the energy being added in the form of heat will start increasing the kinetic energy of the particles again and the temperature will rise.
What is a substance that is not a compound called?
A substance can be a mixture or solution, rather than a compound. These do not require that the separate substances combine chemically. An element is a substance that has only one type of atom.
Why is it necessary to use a powder rather than a crystalline sample when determining melting point?
with a crystalline solids ,transfer of heat will not be uniform which can cause an error in the determination of the melting point of a substance .
What kind of crystalline solids?
It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).
What kind of solid crystalline boron?
It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).
What is kind of solid is crystalline boron?
It is a network solid, a lattice of many covalent bonds (like diamond, except that it is black rather than transparent).
Is NaCl the substance with the lowest melting point is?
NaCl, common table salt, has a rather high melting point. The substance with the lowest melting point is helium. Helium has no solid phase, it melts at any temperature above absolute zero.
Maria is examining a sample of a fine white crystalline substance. Which test will demonstrate that she is looking at a compound rather than an element?
Chemical analysis shows that the substance contains sodium and sulfur.
How do impurities affect the melting point of compound?
effects that impurities have on melting point iof a pre compound. I learned that it is because the impurities "defect" the crystal lattice of the compound. A pure compound is a structure of high molecular symmetry. An impurity is rather assymetrical, or is a poorly organized structure. If the impurites are present with the pure compound, the melting point will deviate because melting point is also dependent on the high symmetry and organization of molecular structures,
The temperature at which a substance becomes a liquid?
It is different for different substances. the generic name for the temperature at which a solid becomes a liquid is the melting point. For a pure chemical compound or an element this is usually a sharp temperature rather than a range.
What is an example of physical rather that a chemical change?
Melting is a physical process.
What is melting point of cork?
Cork burns rather than melts.
How could knowing the melting point of a substance be helpful for a scientist?
- the melting point is specific; we can identify compounds or elements knowing the melting point - the melting point is extremely important in technology, we need to know the behavior of materials under heating
WHAT IS THE MEANING OF COLLOID?
Resembling glue or jelly; characterized by a jellylike appearance; gelatinous; as, colloid tumors., A substance (as albumin, gum, gelatin, etc.) which is of a gelatinous rather than a crystalline nature, and which diffuses itself through animal membranes or vegetable parchment more slowly than crystalloids do; -- opposed to crystalloid., A gelatinous substance found in colloid degeneration and colloid cancer.
