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goldenfox [79]
3 years ago
14

Which is an example of a covalent bond? Chlorine accepts an electron from calcium to form a stable bond. Ions in a bar of pure i

ron are surrounded by a large number of valence electrons. There are less than 16 valence electrons in 2 chlorine atoms, but they form a stable bond.
Chemistry
2 answers:
sukhopar [10]3 years ago
8 0

Answer:

There are less than 16 valence electrons in 2 chlorine atoms, but they form a stable bond

Explanation:

A covalent bond occurs between nonmetal elements, or between a nonmetal and hydrogen or between hydrogen atoms. In this kind of bond, the atoms share electrons.

In the first case, chlorine is accepting electrons from calcium, which is donating. Chlorine is a nonmetal, but calcium is a metal. They form an ionic bond.

In a metal bar, like iron, there are metallic bonds: the metal loses electrons, and the cation (the metal ion) is surrounded by these electrons.

So, in a bond between two chlorine atoms, both nonmetal, there is a sharing of electrons. Both have 7 electrons in the valence shell, and each one shares one electron. They both will have 8 electrons, but the total will be 14 electrons, less than 16.

Ivenika [448]3 years ago
4 0
Chlorine + Calcium --> Ionic Bond
Iron cannot covalently bond as it is a metal
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Write the net cell equation for this electrochemical cell. Phases are optional. Do not include the concentrations. Co ( s ) ∣ ∣
Tatiana [17]

Answer: The overall equation will be Co(s)+2Ag^+(aq)\rightarrow Co^{2+}(aq)+Ag(s)

Explanation:

The representation is given by writing the anode on left hand side followed by its ion with its molar concentration. It is followed by a salt bridge. Then the cathodic ion with its molar concentration is written and then the cathode.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

Anode : Co(s)\rightarrow Co^{2+}(aq)+2e^{-}

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

Cathode : Ag^+(aq)+e^{-1}\rightarrow Ag(s)  \times 2

The number of electrons lost must be equal to the number of electrons gained , thus overall equation will be :

Co(s)+2Ag^+(aq)\rightarrow Co^{2+}(aq)+Ag(s)

5 0
2 years ago
An organic reaction that increases the degreeof unsaturation is called what​
rosijanka [135]
In the analysis of the molecular formula of organic molecules, the degree of unsaturation (also known as the index of hydrogen deficiency (IHD), double bond equivalents, or unsaturation index) is a calculation that determines the total number of rings and π bonds
4 0
3 years ago
Osmosis is the process responsible for carrying nutrients and water from groundwater supplies to the upper parts of trees. The o
ad-work [718]

Answer:

The molar concentration would have to be 0,81 M.

Explanation:

The osmotic pressure equation is:

                                               \pi = M R T

where:

\pi: osmotic pressure [atm]

M: molar concentration [M]

R: gas constant 0,08205 [atm.L/mol.°K]

T: absolute temperature [°K]

To solve the problem, we just clear M from the osmotic pressure equation and then replace our data using the appropiate units. Clearing the variable M we have:

M = \frac{\pi }{RT}

We have to use temperature as absolute temperature (in kelvins), T=29+273=302 °K. Now we can replace our values in the equation:

M = \frac{20,1 atm}{0,08205 \frac{atm.L}{mol.K} * 302 K }

As we can see, all units will be simplified and we'll have the molar concentration in mol/L.

M = 0,81 \frac{mol}{L} = 0, 81 M

7 0
3 years ago
the molar mass of l2 is 253.80g/mol and the molar mass of nl3 is the 394.71g/mol. how many moles of l2 will form 38.58 g of ni3
EastWind [94]
The  moles   of I2  that will   form  38.58g  of Ni3  is  0.147 moles

   calculation
write the  equation  for  reaction  for  formation of   Ni3 from I2  and N2

that is   3I2 +  N2  = 2NI3
 
find the moles  of  Ni3  formed   =  mass/molar mass

=   38.58g/ 394.71  g/mol  = 0.098  moles

by use  of  mole ratio  between  I2  to NI3  which is  3 :2 the  moles of  I2

=  0.098  x3/2 =  0.147  moles
4 0
3 years ago
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Reika [66]

Answer:

endothermic reaction

Explanation:

When Elsa from Frozen freezes things, it is an example of an endothermic chemical reaction.

An endothermic involves a reaction in which heat is absorbed from the surrounding. Hence the surrounding becomes colder at the end of the the change.

So, Elsa draws heat from the environment and this causes the environment to be colder and things that are in contact with her.

4 0
2 years ago
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