How does the melting point of an impure substance compare to the melting point of a...
why does the melting point only “suggest” the identity of a substance while the mixed melting point can actually “prove” its identity?
Melting Point of p-dichlorobenzene 75.9 Melting Point of acetamide 53.2 degrees C Melting Point of solid mixture 53.8 degrees C Boiling Point of acetone 55.8 degrees C Boiling Point of ethyl alcohol 77.6 degrees C Boiling Point of acetone/ethyl alcohol mixture 72.7 What can you conclude about the melting points of pure and impure solids?
Explain why the melting point depresses and broadens when a sample is impure .
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1. Is the melting point of substance A (a) greater than, (b)
less than or (c) equal to the
melting point of substance B?
Explain your reasoning.
2. Is the specific heat of substance A in its solid state (a)
greater than, less than, or (c)
equal to the specific heat of substance B in its solid
state?
Explain your reasoning.
3. Is the latent heat of fusion of substance A (a) greater than,
(b) less than or (c)...
The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees are there between the melting point and the boiling point? 20 70 90 110
30pts total) 1. Irwo known substances have the same melting point as an unknown substance that you obtained, how could you determine if either of the two known substances is your unknown compound? 2. You are given an impure mix of substances that contains a solid substance, Chemical X, that is soluble in ethanol at all temperatures. You know there is an insoluble impurity in the mix as well as a very soluble impurity, both in ethanol. Can you recrystallize...
Predict which pure substance will have the lower melting point, baking soda (NaHCO,) or phonol (C,H,OH)? Explain your answer Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help higher Phenol will have the compound melting point. The baking soda is an type of attractive force present, so is predicted to have a weakest and has the melting point lower strongest aromatic lonic
17. A pure compound melts at 48-49 degrees Celsius. If a trace amount of an impure compound, whose melting point is 80-82 degrees Celsius, is mixed in with the first compound, what happens to the melting point of the pure compound? A. The second compound would lower the melting point of the first one B. It is impossible to determine without knowing the identity of the two compounds. C. The second compound would raise the melting point of the first...
ı. What is expected in measuring the melting point of a pure sample? 2. What is expected in measuring the melting point of an impure sample? 3. Look up the definition of the term Eutectic temperature. (Reference books available in the library or the chemistry lab, ask Mr. Funck to get them for you.) 4. What safety precautions should be observed in this laboratory'? s. Look up the melting points of the possible unknowns. Organic Chemistry with Vernier O Vernier...
If the melting point of the substance is 70.°C, how much heat
would be required to convert 1.0 mol of it from solid at 30.°C into
liquid at 105°C?
A substance has the following properties: AHfus = 20.0 kJ/mol AHvap = 10.0 kJ/mol Co (solid) = 60. J mol-- K-1 Cp (liquid) = 30. J mol-- K-1 Cp(gas) = 60. J mol-1 K-1