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
If you change the 2 in front of 2O2 to a 3, what will be the change in the results on the right side of the equation? (1 point)
Simora [160]

Answer:

There is an extra O2 molecule left over

Explanation:

3 0
3 years ago
Which sentence describes all atoms of one element?
allsm [11]

Answer:

4. they have the same number of protons

Explanation:

while all the other particles and attributes can be changed, protons cannot.

4 0
3 years ago
Iodine would have chemical properties most like?
mrs_skeptik [129]
<span>manganese (Mn)
.tellurium (Te)
.chlorine (Cl).
<span>xenon (Xe).</span></span>
6 0
3 years ago
Is there are a total of 7.3 x 10^29 atoms in a sample of glucose, C6H12O6(s),what amount in miles of glucose is in the sample?
Vadim26 [7]

(7.3 x 10^29 atoms) / (24 atoms/molecule) / (6.022 x 10^23 molecules/mol) =  

5.1 x 10^4 mol C6H12O6

4 0
3 years ago
Give the nuclear symbol for the isotope of potassium for which a=40?
KATRIN_1 [288]

<span>nuclear symbol consists of three parts: 1. the symbol of the element; 2. the atomic number of the element;3. the mass of the element. for the above problem, the symbol for potassium is k. it's atomic number is 40. the number of protons is 19. so we denote this in the following nuclear symbol; 40 k 19</span>

4 0
3 years ago
Read 2 more answers
Other questions:
  • Una disolución acuosa contiene el aminoácido glicina (NH2CH2COOH). Suponiendo que
    10·1 answer
  • Whats a process that keeps food safe and clean
    6·2 answers
  • In a relationship with two variables, when one variable becomes larger by a given factor and the other becomes smaller by the sa
    7·2 answers
  • A sample of an unknown compound has a percent composition of 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. Which compounds
    10·2 answers
  • What are the two factors that affect the strength of gravity
    12·1 answer
  • Super lost plz help
    5·1 answer
  • What are the side effects of Sulfas and Macrolides?​
    8·2 answers
  • What is produced on the top of the pool of water by the mutual attraction between water molecules
    14·1 answer
  • How could both phone and tv break in the collision?​
    14·1 answer
  • 2)a dish contains a blackish-yellow powder.when a magnet is moved over it black particles iron get stuck to the magnet and only
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!