1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kipish [7]
3 years ago
6

Indicate whether each of the following statements is TRUE or FALSE 1. A sharp melting point for a crystalline organic material a

lways indicates a pure single compound 2. A molecular size impurity always lowers the melting point of an organic compound 3. If the addition of a sample of compound A to compound B does not change the melting point of B, A and B must be identical 4. An eutectic mixture has a sharp melting point Answer 4 Melting and freezing points of a pure compound are identical
Chemistry
1 answer:
yulyashka [42]3 years ago
5 0

Answer:1. False, 2. False, 3. True, 4. True

Explanation:

1. FALSE. Pure crystalline solids have sharp melting points, while the present of impurity lower the melting point. This is True, but the exception is a eutectic mixture. A properly mixed eutectic mixture have a sharp melting point also.

2. FALSE, although the present of impurity lower the melting point of a organic compound, but if a molecular size impurity with a significantly higher melting point and is present in large quantities the melting point of the organic compound will not be lowered.

3. TRUE, two compounds with same melting point, when mixed together will not change the melting point of either compounds. But if A has higher MP than B and the addition of A to B creates mixture with same melting point as pure A then the statement will be false.

4. TRUE, a properly mixed eutectic mixture will have a sharp melting point.

Melting point and freezing point of a pure compound will be identical because the liquid form of a pure substance when cooled it forms a stable arrangement that supercooling is prevented, freezing occur at the same temperature at which the pure solid phase melts

You might be interested in
What is the longest wavelength in the Balmer series? (Hint: the Rydberg constant for Hydrogen is 1.096776×107 1/m, and the Balme
boyakko [2]

<u>Answer:</u> The longest wavelength of light is 656.5 nm

<u>Explanation:</u>

For the longest wavelength, the transition should be from n to n+1, where: n = lower energy level

To calculate the wavelength of light, we use Rydberg's Equation:

\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )

Where,

\lambda = Wavelength of radiation

R_H = Rydberg's Constant  = 1.096776\times 10^7m^{-1}

n_f = Higher energy level = n_i+1=(2+1)=3

n_i= Lower energy level = 2    (Balmer series)

Putting the values in above equation, we get:

\frac{1}{\lambda }=1.096776\times 10^7m^{-1}\left(\frac{1}{2^2}-\frac{1}{3^2} \right )\\\\\lambda =\frac{1}{1.5233\times 10^6m^{-1}}=6.565\times 10^{-7}m

Converting this into nanometers, we use the conversion factor:

1m=10^9nm

So, 6.565\times 10^{-7}m\times (\frac{10^9nm}{1m})=656.5nm

Hence, the longest wavelength of light is 656.5 nm

4 0
3 years ago
If you try to place the compound on the pan over the flame, what could possibly happen? Explain your answer. [2 marks] anyone pl
Scilla [17]

Answer:

it will probably flame up or explode or maybe start boiling

8 0
2 years ago
Acceleration is defined as the rate of change for which characteristic?
weeeeeb [17]

Answer:

Acceleration is defined as the rate of change for velocity.

4 0
3 years ago
¿Cuál es la carga eléctrica del átomo? Justificar.
Ksivusya [100]

Answer:

Es la cantidad de protones menos la cantidad de electrones.

Explanation:

Es la cantidad de protones menos la cantidad de electrones.

Por cierto, suscríbete a Kevin Tuna Music

8 0
3 years ago
An atom has a mass number of 24 and 13 neutrons. What is the atomic number of this atom?
netineya [11]
A=Mass number=24
N=neutrons=13
Z=atomic number.

A=Z+N

24=Z+13
Z=24-13
Z=11

The atomic number is 11, and this atom is sodium. 
6 0
3 years ago
Read 2 more answers
Other questions:
  • 200 grams of an organic sample which contains only carbon, hydrogen, and oxygen is analyzed and found to contain 97.30 grams of
    11·2 answers
  • What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10 g of the compound yields 6.59 g co2 and 2.7
    10·1 answer
  • Milk spoiled is what type of change
    12·2 answers
  • What energy is a quarterback’s arm before throwing a pass
    14·2 answers
  • when the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution
    14·1 answer
  • Given the equation representing a reversible reaction:
    15·1 answer
  • What is meant by "citing a source"?remembering where you found the materialnaming the source of the informationkeeping the note
    7·1 answer
  • Calculate the number of atoms in 112 g of iron.​
    12·1 answer
  • A 350.0 ml sample of gas has a temperature of 22.7 C and a pressure of 0.914 atm. What temperature would be needed for the same
    8·1 answer
  • Which of the following explains observations?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!