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
Stella [2.4K]
2 years ago
11

Hello people ~

Chemistry
1 answer:
Sever21 [200]2 years ago
7 0
<h3><u>Question:</u><u>-</u></h3>

Criteria for purity of organic solid is

(a) boiling point

(b) melting point

(c) specific gravity

(d) none of these

<h3><u>Answer</u><u>:</u><u>-</u></h3>

(b) melting point

<h3><u>Explanation</u><u>:</u><u>-</u></h3>

Melting point is considered to be the best measure of purity of a substance.

When a purified sample is mixed with a small amount of pure compound , melting point of the mixture is determined.

If a substance is impure (contains impurities/other substance) the melting point of that substance will change.

________________________________

The purity percentage of a substance can be calculated by dividing the mass of the pure chemical by the total mass of the sample and multiplying this number by 100.

[Mass of pure chemical/total mass × 100]

You might be interested in
Chloroform, formerly used as an anaesthetic and now believed to be a carcinogen, has a heat of vaporization ΔHvaporization = 31.
djverab [1.8K]

Answer:

Chloroform is expected to boil at 333 K (60 ^{0}\textrm{C}).

Explanation:

For liquid-vapor equilibrium at 1 atm, \Delta G^{0} = 0.

We know, \Delta G^{0}=\Delta H^{0}-T\Delta S^{0} , where T is temperature in kelvin scale.

Here both \Delta H^{0} and \Delta S^{0} are corresponding to vaporization process therefore T represents boiling point of chloroform.

So, 0=(31.4\times 10^{3}\frac{J}{mol})-[T\times (94.2\frac{J}{mol.K})]

or, T = 333 K

So, at 333 K (60 ^{0}\textrm{C}) , chloroform is expected to boil.

6 0
3 years ago
Read 2 more answers
What best describes the role of the squirrel in the food web ​
Luden [163]

Answer:

squirrels play a essential role in the food chain as prey and predator they provide nutrition different organisms in habitats and promoting their predator

Explanation:

that's what the role is

3 0
4 years ago
Determine the mass (in g) of a substance, with a density of 2.26 g/mL, that occupies 350.0 mL.
Andreyy89

Answer:

m = 79.1 grams

Explanation:

Given that,

Density, d = 2.26 g/mL

Volume occupies, V = 35 mL

We need to find the mass of the substance. We know that the density of an object is equal to the mass per unit volume. So,

d = m/V

m=d\times V\\\\m=2.26\ g/mL\times 35\ mL\\\\m=79.1\ g

So, the mass of the substance is 79.1 grams.

6 0
3 years ago
How many grams of NH3 can be produced from 4.89 mol of N2 and excess H2.
Svetllana [295]

Answer:

166.56g of NH3 are produced

Explanation:

The reaction of N2 with H2 to produce NH3 is:

N2 + 3H2 → 2NH3

<em>Where 1 mole of N2 produce 2 moles of NH3</em>

<em />

4.89 moles of N2 with excess of H2 produce:

4.89 moles N2 * (2 moles NH3 / 1 mole N2) = 9.78 moles NH3

As molar mass of NH3 is 17.031g/mol, mass of NH3 produced is:

9.78 moles * (17.031g / mol) =

<h3>166.56g of NH3 are produced</h3>
3 0
3 years ago
What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirlin
iogann1982 [59]
The answer is d in this case


4 0
3 years ago
Read 2 more answers
Other questions:
  • Give two possible reasons why using tap water instead of distilled water could give misleading
    10·1 answer
  • In which way are a prokaryotic cell and a eukaryotic cell alike?  
    15·2 answers
  • Select the atoms that belong to the same element
    10·2 answers
  • 2- A gas has a volume of 500 mL at a temperature of -73.0 °C. What volume will the gas
    8·2 answers
  • Because they have aromas, compounds with a ring of resonance bonds are called –
    10·1 answer
  • Many children are uncomfortable around white lab coats. Specifically explain why this occurs in what a doctor or dentist could d
    14·1 answer
  • Which technology would be the most useful in predicting an eruption from an undersea volcano and why
    6·1 answer
  • In a stable atom, the number of protons are?
    5·2 answers
  • Please help-- 16 pts!
    5·1 answer
  • Volcanoes will most likely form along a convergent plate boundary that is....
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!