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Dafna11 [192]
3 years ago
11

__________ lenses refract light rays in toward a central point. When this lens is held close to your eye, the image is magnified

and right side up. A) Concave B) Convex C) Prismatic D) Refractive
Chemistry
2 answers:
saul85 [17]3 years ago
8 0
<span>__________ lenses refract light rays in toward a central point. When this lens is held close to your eye, the image is magnified and right side up.

</span>
<span>B) Convex</span>
andreev551 [17]3 years ago
7 0
The answer would be either a concave or b convex
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A solution has an initial concentration of 0.0100 m hclo (ka = 3.5×10−8 ) and 0.0300 m naclo. what is the ph after the addition
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When [HClO]= 0.01 M  & [ClO]^- = 0.03M & NaOH = 0.003 mol and
 Ka = 3.5 x 10^-8 
and the equation is:
            HClO + NaOH → Na^+  + ClO^-
initial     0.01     0.003        0.03     0.03
            -0.003 - 0.003      +0.003  + 0.003
Final    0.007        0             0.033      0.033

We can get the PH from this formula:
PH = Pka + ㏒[conjugent base/weak acid]
PH = -㏒Ka + ㏒[Na]/[HClO]
      = - ㏒ 3.5x10^-8 + ㏒(0.033/0.007)
     = 8.13 
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