Answer:
When calcium reacts with tellurium it will donates its two electrons and these two electron will be accepted by tellurium.
There must be 1 calcium atom for every 1 tellurium atom in the reaction.
Explanation:
Calcium has atomic number of 20. Its electronic configuration is given as:
![[Ca]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2](https://tex.z-dn.net/?f=%5BCa%5D%3D1s%5E2%202s%5E2%202p%5E6%203s%5E2%203p%5E6%204s%5E2)
Calcium atom will loose 2 elections to attain electronic configuration of noble gas.
![[Ca^{2+}]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^0](https://tex.z-dn.net/?f=%5BCa%5E%7B2%2B%7D%5D%3D1s%5E2%202s%5E2%202p%5E6%203s%5E2%203p%5E6%204s%5E0)
Tellurium has atomic number of 52. Its electronic configuration is given as:
![[Te]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4s^24p^6 4d^{10} 5s2 5p4](https://tex.z-dn.net/?f=%5BTe%5D%3D1s%5E2%202s%5E2%202p%5E6%203s%5E2%203p%5E6%204s%5E2%203d%5E%7B10%7D%204s%5E24p%5E6%204d%5E%7B10%7D%205s2%205p4)
Tellurium atom will gain 2 elections to attain electronic configuration of noble gas.
![[Te^{2-}]=1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4s^24p^6 4d^{10} 5s2 5p6](https://tex.z-dn.net/?f=%5BTe%5E%7B2-%7D%5D%3D1s%5E2%202s%5E2%202p%5E6%203s%5E2%203p%5E6%204s%5E2%203d%5E%7B10%7D%204s%5E24p%5E6%204d%5E%7B10%7D%205s2%205p6)
So, when calcium reacts with tellurium it will donates its two electrons and these two electron will be accepted by tellurium.
There must be 1 calcium atom for every 1 tellurium atom in the reaction.
As the water is heated, c. the kinetic energy of the water molecules increases. Kinetic energy is the energy caused by an object's motion. This means that water molecules tend to move faster when heated. This is related to its temperature increase, as temperature is directly proportional to kinetic energy.
1.679 × 10²³ g of PbO₂ is present in 4.23×10⁴⁴ particles of PbO₂.
<u>Explanation:</u>
First the number of particles is converted into moles by dividing it by the Avogadro's number and then moles multiplied by the molar mass, we will get the mass of PbO₂ in grams.
4.23×10⁴⁴/ 6.022×10²³ = 7.02×10²⁰ moles
Now we have to multiply this by the molar mass of PbO₂, that is 239.2 g/mol, we will get the mass in grams.
7.02×10²⁰ moles × 239.2 g/mol = 1.679 × 10²³ g of PbO₂
Answer: Electrons have a negative charge
Answer : The temperature for non-catalyzed reaction needed will be 456 K
Explanation :
Activation energy : The energy required to initiate the reaction is known as activation energy.
According to the Arrhenius equation,
Since, the rate for both the reaction are equal.
..........(1)
where,
= activation energy for non-catalyzed reaction = 75 kJ/mol
= activation energy for catalyzed reaction = 49 kJ/mol
= temperature for non-catalyzed reaction = ?
= temperature for catalyzed reaction = 
Now put all the given values in the above formula 1, we get:
Therefore, the temperature for non-catalyzed reaction needed will be 456 K
