Answer:Your answer is B
Hope this helps have a great day<3
Explanation:
Valence electrons are the electrons in the outermost shell of an element on the periodic table. Atoms want to be able to have a full outer shell and they can share or trade electrons in order to achieve this. Valence electrons are also super super important in chemical reactions. The number of valence electrons determines what group that specific atom or element is in on the periodic table. This affects the reactivity of the element.
Answer:
C,A,B,D
Explanation:
That's the correct order, hope this helps
Answer:
Ka = 4.9 X 10^-9
Explanation:
when the pH is 4.95
the [H+] = 10^-4.95
[H+] = 1.122 e-5
since the equilibrium equation is:
HCN <=> 1 mole H+ & 1 mole CN-
then
[H+] = [CN-]
when
HCN <=> H+ & CN-
Ka = [ H+] [CN-] / [HCN]
Ka = [ 1.122 e-5] [ 1.122 e-5] / [0.255]
Ka = 1.256 e-10 / 0.255
Ka = 4.94 e-9
which rounds off to 2 sig figs into
Ka = 4.9 X 10^-9
======================
p.s. it was the pH pf 4.95 that limited the calculations to 2 sig figs
Catalyst increase the rate of reaction
Catalyst decrease the activation energy needed to start a reaction
They are not used up in the reaction
Catalyst are not very specific
Explanation:
From the basic chemistry it is known Catalysts are substance that accelerates the rate of reaction without altering the nature of reaction.
Catalysts decreases the energy required for activation, in order to make collisions quicker.
Then, Catalyst just alters the rate of reaction alone and doesn't takes part in the chemical reaction.
Some catalysts are specific. But in general most of the catalysts are not specific in nature.
