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4 years ago

News shows evidence of being plagiarized

Chemistry

1 answer:

mel-nik [20]4 years ago

7 0

What this is??????????????????

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What are Examples of Theory ! I will mark brainly

12345 [234]

An example is the cell theory

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3 years ago

Write the chemical symbols for three different atoms or atomic anions with 35 electrons.

alina1380 [7]

Bromine atom, Br has 35 electrons
In Se there are 34 electrons and if it gain one electron and get negative charge then it has 35 electrons. So the symbol of anion wit 35 electrons is
Se⁻ has 35 electrons
<span>Another anion, no longer solid as quickly as back is As</span>²⁻
<span>As has 33 electrons and the two negatives shows now it has 35 electrons.</span>

4 0

3 years ago

What is the concentration in mol L-l of a 12% solution of tetrahydrate magnesium chloride (MgCl2)?

madreJ [45]

The concentration in mol L-l (M) = 0.717

<h3>Further explanation</h3>

Given

12% solution of tetrahydrate magnesium chloride (MgCl₂)

Required

The concentration

Solution

Tetrahydrate magnesium chloride (MgCl₂)⇒MgCl₂.4H₂O

MW = Ar Mg+2. Ar Cl+8. Ar H + 4. Ar O

MW=24.31 + 2 x 35.45 + 8 x 1.01 + 4 x 16

MW=24.31+70.9+8.08+64

MW=167.29 g/mol

12% solution = 12 % m/v = 12 g in 100 ml solution

For 1 L solution :

$\tt \dfrac{1}{0.1}\times 12~g=120~g$

The concentration in g/L = 120 g/L

Convert grams to moles :

$\tt mol=\dfrac{120}{167.29}=0.717$

3 0

3 years ago

True or False: If bubbles are produced when two reactants are mixed, a chemical reaction has occurred.

sergejj [24]

Answer:

True

Explanation:

Because yes

6 0

3 years ago

Read 2 more answers

How many molecules are in 2.50 moles of H2O?

Aliun [14]

Answer:

$A.1.51*10^{24}\ molecules\ of\ H_2O$

Explanation:

$We\ are\ given:\\No.\ of\ moles\ of\ H_2O\ provided=2.5\ moles\\Now,\\We\ know\ that,\\ Avagadro's\ Constant=6.022*10^{23}\\Now,\\We\ also\ know\ that:$

$No.\ of\ particles=No.\ of\ moles*Avagadro's\ Constant\\Hence,\ here,\\No.\ of\ molecules\ in\ 2.5\ moles\ of\ H_2O=2.5*6.022*10^{23}\\Hence,\\No.\ of\ molecules\ in\ 2.5\ moles\ of\ H_2O=15.055*10^{23}\ H_2O\ molecules\\Now,\\No.\ of\ molecules\ in\ 2.5\ moles\ of\ H_2O=1.5055*10^{24}\ H_2O\ molecules\\ or\ 1.51*10^{24}\ H_2O\ molecules$

6 0

3 years ago