Answer:The number of valence electrons in an atom increases down the group due to the increase in energy levels at progressively lower levels. The electrons are progressively further from the nucleus; therefore, the nucleus and the electrons are not as attracted to each other. An increase in shielding is observed.
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The difference between ordinary, analar and industrial reagents is the in the purity. Ordinary reagents are those whose purity meets the standard. Analar reagents are used in chemical analysis and they are of high purity but with known contaminants which again illustrates their use in chemical analyses.Finally the industrial reagents are not pure enough and they are used for industrial purposes as well for commercial use.
Question options:
a) 2.05
b) 0.963
c) 0.955
d) 1.00
Answer:
b) 0.963
Explanation:
H2SO4→ HSO4- + H3O+
HSO4- + H2O ⇌ SO42- + H3O+
Construct ICE table:
HSO4- (aq) + H2O ⇌ SO42- (aq) + H3O+ (aq)
I 0.1 solid & 0 0.1
C -x liquid + x + x
E 0.1 - x are ignored x 0.1 + x
Calculate x
Ka = products/reactants
= ![\frac{[SO42-] [H3O+]}{[HSO4-]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BSO42-%5D%20%5BH3O%2B%5D%7D%7B%5BHSO4-%5D%7D)
0.011 = 
0.011 x (0.1 -x) = o.1x + x^2
0.0011 - 0.011 x - o.1x - x^2 = 0
0.0011 - 0.011 x - x^2 = 0
Use formula to solve for quadratic equation
x = 
/ 2a
a = -1, b = -0.111, c = 0.001
Solve for x
x = ![\sqrt[-(-o.111)]{(-0.111)^2 - 4(-1) (0.0011) }](https://tex.z-dn.net/?f=%5Csqrt%5B-%28-o.111%29%5D%7B%28-0.111%29%5E2%20-%204%28-1%29%20%280.0011%29%20%7D)
/ 2(-1)
x = 0.111 +,- 
/ -2
x = 0.111 +,- 
/ -2
x = 
x = 
, x = 
x = 
, x = 
x = - 0.12015 , x = 0.00915
x cannot be negative, so
x = 0.00915 M
Calculate [H3O+]
[H3O+] = 0.1 M + x
[H3O+] = 0.1 M + 0.00915 M
[H3O+] = 0.10915 M
Clculate pH
pH = - log [ H3O+]
pH = - log [ 0.10915]
pH = 0.963
Answer: <em>B) Demonstrate the importance of worker-employer cooperation.</em>
Explanation: Slow down or strike is a demenstration to the employer just how important the workers are to the corp and work place. Nothing can function or run properly without them.
<h2><em>If this is the best answer please mark brainilest. Hope this helps, have a great day!</em></h2>
.50 M KCl because 5% is the same as .05, which makes the .50M more concentrated.
