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Vera_Pavlovna [14]
3 years ago
15

Plz help me again I can not do science I stg I might lose my mind.

Chemistry
2 answers:
SOVA2 [1]3 years ago
6 0

Answer:

htt ps://w ww.you tube.co m/wat ch?v=Bly szGfqubY

Explanation:

kakasveta [241]3 years ago
3 0
The answer is D thank me later
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2 years ago
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Porquê que o potássio é mais reativo que o cálcio? urgente!
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4 0
3 years ago
How many milliliters of .085 m naoh are required to titrate 25 ml of .072 m hbr to the equivalence point?
SOVA2 [1]
The ML  of 0.85  m NaOH    required   to  titrate  25 ml of  0.72m hbr  to  the  equivalence  point  is calculated  as  follows

calculate  the moles  of HBr used

moles  = molarity  x  volume

25  x0.072/1000=  0.0018 moles


write the  equation  for  reaction

NaOH + HBr = NaBr  +  H2O
from   reacting   equation the  mole ratio  between  NaOH  to  HBr  is  1:1  therefore  the  moles of  NaOH  =  0.0018 moles

volume   =  moles/molarity
0.0018/0.085 =  0.021  L  in Ml  =  0.021  x1000=21.18 Ml  ofNaOH

8 0
3 years ago
What element has 4 valence electrons and 5 electron shells?
marta [7]

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Explanation:  The electron configuration for tin (Sn) is shown in the picture.  It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

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