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Kamila [148]
3 years ago
13

What particle did j.j. Thomson discover?

Chemistry
1 answer:
Dovator [93]3 years ago
8 0
"In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas."
Source:abcte.org
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A mixture of methanol and methyl acetate contains 15.0 wt% methanol.
Usimov [2.4K]

The mixture flow rate in lbm/h = 117.65 lbm/h

<h3>Further explanation</h3>

Given

15.0 wt% methanol

The flow rate of the methyl acetate :100 lbm/h

Required

the mixture flow rate in lbm/h

Solution

mass of methanol(CH₃OH, Mw= 32 kg/kmol) in mixture :

\tt 15\%\times 200~kg=30~kg\\\\mol=\dfrac{mass}{MW}=\dfrac{30~kg}{32~kg/kmol}=0.9375~kmol

mass of the methyl acetate(C₃H₆O₂,MW=74 kg/kmol,85% wt) in 200 kg :

\tt 85\%\times 200=170~kg\\\\mol=\dfrac{170}{74}=2.297~kmol

Flow rate of the methyl acetate in the mixture is to be 100 lbm/h.

1 kg mixture = 0.85 .methyl acetate

So flow rate for mixture :

\tt \dfrac{1~kg~mixture}{0.85~methyl~acetat}\times 100~lbm/h=117.65~lbm/h

5 0
3 years ago
Calculate the ph of a solution containing 0.0451 m potassium hydrogen tartrate and 0.028 m dipotassium tartrate. The ka values f
Marina86 [1]

Given buffer:

potassium hydrogen tartrate/dipotassium tartrate (KHC4H4O6/K2C4H4O6 )

[KHC4H4O6] = 0.0451 M

[K2C4H4O6] = 0.028 M

Ka1 = 9.2 *10^-4

Ka2 = 4.31*10^-5

Based on Henderson-Hasselbalch equation;

pH = pKa + log [conjugate base]/[acid]

where pka = -logKa

In this case we will use the ka corresponding to the deprotonation of the second proton i.e. ka2

pH = -log Ka2 + log [K2C4H4O6]/[KHC4H4O6]

     = -log (4.31*10^-5) + log [0.0451]/[0.028]

pH = 4.15



4 0
3 years ago
Which button is a shortcut for scientific notation on<br> a scientific calculator?
Svetlanka [38]

Answer: For many calculators, including the TI –83 and TI 83 Plus, the [EE] button is used to enter scientific notation. The [EE] button can be found in yellow above the comma key [,].

8 0
3 years ago
Arrange in the correct order of occurrence. Write 1 – 5 for each statement.
ss7ja [257]

Answer:

Explanation:Rocks are heated and melt.

Some magma move sideways in opposite directions.Magma cools and sinks.Magma expands and rises at divergent boundaries.Magma expands and rises at divergent boundaries.

6 0
3 years ago
The bond energy between carbon and oxygen is 358 for a single bond (C-0) and 745 for a double bond (C=0). Why is the bond energy
steposvetlana [31]

As  Bond energy is between carbon and oxygen the is 358 for a single bond of C-0 and 745 for a double bond is the  c=0.

  • In the first step the one atom pulls the electron from another atom . In the second step that is forming bonds releases energy and is the exothermic . In the third step they pull electrons away from other elements .
  • In the last step the additional bonds is needed more energy to make or break, so the bond energy is very higher  Hence the  -153.

Learn more about the energy between carbon and oxygen is 358.

brainly.com/question/26244428.

7 0
2 years ago
Read 2 more answers
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