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Neko [114]
3 years ago
10

Which of these solutes raises the boiling point of water the most?

Chemistry
2 answers:
Vlad [161]3 years ago
7 0
I think the answer would be Ionic sodium phosphate (Na3PO4) because it has the greatest boiling point elevation.
never [62]3 years ago
7 0

Answer: ionic sodium phosphate (Na_3PO_4)

Explanation:

The formula used:

\Delta T_b=i\times k_b\times m

\Delta T_b= change in boiling point

i = Van'T Hoff factor  

k_b = boiling point constant

m = molality

1.  For LiCl

LiCl\rightarrow Li^{+}+Cl^{-}  

i= 2 as it is ionic and dissociate to give 2 ions.

2. For NaCl

NaCl\rightarrow Na^{+}+Cl^{-}  

i= 2 as it is ionic and dissociate to give 2 ions.

3. For C_{12}H_{22}O_{11}

, i= 1 as it is a non electrolyte and does not dissociate.

4. For Na_3PO_{4}

Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}  

, i= 4 as it is ionic and dissociate to give 4 ions.

5.  For MgBr_{2}

MgBr_2\rightarrow Mg^{2+}+2Br^-  

, i= 3 as it is ionic and dissociate to give 3 ions.

Thus as vant hoff factor is highest for Na_3PO_{4} , the boiling point will be raised most.

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What are the Physical changes for oxygen?
wolverine [178]

Answer:

Oxygen is a colorless, odorless, tasteless gas. It changes from a gas to a liquid at a temperature of -182.96°C (-297.33°F). The liquid formed has a slightly bluish color to it. Liquid oxygen can then be solidified or frozen at a temperature of -218.4°C (-361.2°F).

4 0
2 years ago
There are ________ σ bonds and ________ π bonds in h3c-ch2-ch=ch-ch2-c≡ch.
FrozenT [24]
The number of sigma and pi bonds are,

          Sigma Bonds  =  16

          Pi Bonds         =   3

Explanation:
                   Every first bond formed between two atoms is sigma. Pi bond is formed when already a sigma bond is there. While in case of Alkyne (triple Bond) there is one sigma and one pi bond already present, so the third bond is formed by second side-to-side overlap of orbitals, hence, a second pi bond is formed.
Below all black bonds are sigma bonds, while in alkene there is one pi bond and in alkyne there are two pi bonds.

6 0
3 years ago
9. A student wished to prepare ethylene gas by dehydration of ethanol at 140oC using sulfuric acid as the dehydrating agent. A l
Arte-miy333 [17]

We have that the the liquid is

  • C_2H_5OH (ethanol
  • And at a condition of H_2SO4 as catalyst and temp 170

From the question we are told

  • A student wished to prepare <em>ethylene </em>gas by <em>dehydration </em>of ethanol at 140oC using sulfuric acid as the <em>dehydrating </em>agent.
  • A low-boiling liquid was obtained instead of ethylene.
  • What was the liquid, and how might the reaction conditions be changed to give ethylene

<h3>Ethylene formation</h3>

Generally the equation is

2C_2H_5OH------CH3CH_2O-CH_2CH_3+H_20

Therefore

with ethanol at 140oC

The product is diethyl ethen

The reaction at 170 ethylene will give

C_2H_5OH-------CH_2=CH_2+H_2O( at a condition of H_2SO4 as catalyst and temp 170)

Therefore

The the liquid is

  • C_2H_5OH (ethanol

For more information on Ethylene visit

brainly.com/question/20117360

8 0
2 years ago
A measure of the kinetic energy of particle motion within a substance is temperature.
Natali5045456 [20]
I believe it’s true when particles move they create heat
4 0
3 years ago
Read 2 more answers
Pb has an atomic number of 82. It has an isotope Pb-207. The mass number is 207.
nikdorinn [45]

Answer:

Number of protons = 82

Explanation:

Given data:

Atomic number of Pb = 82

Mass number of Pb-207 = 207

Number of protons = ?

Solution:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

Atomic number of Pb = number of protons or electrons

82 = number of protons or electrons

Mass number = Number of protons + number of neutron

207 = 82 + number of neutron

Number of neutrons = 207 - 82

Number of neutrons = 125

5 0
3 years ago
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