Answer:
C- an explanation as to why you chose your topic
Explanation:
Answer:
option D= it makes the reaction harder to start.
Explanation:
Activation energy:
It is the minimum amount of energy required by chemical specie to start the chemical reaction.
Explanation:
The activation energy is inversely related to the rate of reaction. The higher the activation energy the slower will be the reaction rate.
Molecules are colloid with each other and gain kinetic energy if this energy is higher than the transition state energy then molecules easily undergo the chemical reaction. Because molecules easily overcome the barrier i.e transition state.
When the kinetic energy is lower than molecules can not pass the barrier. They require the input which is called activation energy to pass the barrier.
The higher the activation energy, the difficult for the reaction to proceed. Catalyst are used to lower the activation energies because in this way lower will be the transition state, and higher will be the reaction rate.
<span>Energy is required to produce a chemical change during (2) electrolysis, given that it is the only stage which includes only a chemical change. The other options include physical changes as well.</span>
Answer:
A metallic bond is the sharing of many detached electrons between many positive ions, where the electrons act as a "glue" giving the substance a definite structure. It is unlike covalent or ionic bonding. Metals have low ionization energy. Therefore, the valence electrons can be delocalized throughout the metals.
Answer:
Explanation:
a) chalcogens are elements of group 16 of periodic table.
Tellurium have mass no 125. atomic no 52 so ¹²⁵Te₅₂ is the symbol .
b) halogen ( group 17 elements) radioactive isotope is astatine
atomic no is 85 and mass no may be 210 ( most stable) ²¹⁰At₈₅
c) neon gas is used in lighting .It is a noble gas .
²⁰Ne₁₀ is the symbol
d) lightest alkali metal Beryllium ( Be) .Isotope having 3 neutrons is
⁷Be₄ .
