Answer:
Explanation:
Sodium chloride is ionic compound. It is formed by the transfer of electron from one atom to the atom of another element.
Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.
The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations.
Sodium atom have one valance electron by losing this one valance electron sodium atom get the complete octet. Chlorine atom has seven valance electrons and needed to lose seven valance electrons or to get one electron and thus complete the octet. It is very easy for chlorine atom to get one electrons instead of losing all seven electron. Thus when it react with sodium it gain the valance electron of sodium and form ionic compound.
That's why only one atom of sodium combine with one atom chlorine.
<h3>
Answer:</h3>
Reactivity increases because the valence level is further from the nucleus of an atom.
<h3>
Explanation:</h3>
- The reactivity of elements in the periodic table depends on the position of the element in the periodic table.
- The trend in the reactivity across the period and down the group depends on whether one is dealing with metallic elements or non-metallic elements.
- Reactivity of metals such as alkali metals and alkali-earth metals increases down the group as the number of energy levels increases making valence electrons to be further from the nucleus.
- Reactivity of non-metallic groups such as halogen decreases down the group as energy levels increase which reduces the nuclear attraction of the valence electrons to the nucleus.
The process by which gas changes to a solid is deposition.
Answer : The pressure of 
is 0.975 atm.
Solution : Given,
Mole fraction of = 0.25
Mole fraction of 
= 0.65
Mole fraction of 
= 0.10
Total pressure of mixture = 3.9 atm
According to the Dalton's law of partial pressure, which tells that the partial pressure of a gas is directly proportional to the mole fraction of a gas.
where,
= partial pressure of a gas
= mole fraction of a gas
= total pressure of gas
Now we have to calculate the partial pressure of gas.
Put all the given values in above formula, we get
The partial pressure of is 0.975 atm.
Answer:
ΔH = 200 kJ/mol
Explanation:
Step 1: Data given
activation energy (Ea) is: 450 kJ/mol
activation energy (Ea) of the reverse reaction is 250 kJ/mol
Step 2: The balanced equations
C4H10 ---> C2H6 + C2H4 Ea = 450 kJ/mol
C2H6 + C2H4 ---> C4H10 Ea = 250 kJ/mol
Step 3: Calculate ΔH
Since the reverse reaction has a lower activation energy, this means we need less reaction for the reverse reaction to happen. We can say the reaction absorbs energy, so this is the endothermic reaction.
Ea ( of the forward reaction) = ΔH + Ea (of the reverse reaction)
ΔH = Ea ( of the forward reaction) - Ea (of the reverse reaction)
ΔH = 450 kJ/mol - 250 kJ/mol
ΔH = 200 kJ/mol
Since the reactionis endothermi, ΔH is positive
