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cluponka [151]
3 years ago
7

Among the following, which element has the lowest ionization energy?

Chemistry
1 answer:
d1i1m1o1n [39]3 years ago
4 0
The answer is A. Na

because it's<span /> 5,1391
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What is the boiling point of a solution containing 203 g of ethylene glycol (C2H6O2) and 1035 g of water? (Kb for water is 0.52
Andru [333]

Answer:

101,37°C

Explanation:

Boiling point elevation is one of the colligative properties of matter. The formula is:

ΔT = kb×m <em>(1)</em>

Where:

ΔT is change in boiling point: (X-100°C) -X is the boiling point of the solution-

kb is ebulloscopic constant (0,52°C/m)

And m is molality of solution (mol of ethylene glycol / kg of solution). Moles of ethylene glycol (MW: 62,07g/mol):

203g × (1mol /62,07g) = <em>3,27moles of ethlyene glycol</em>

<em />

Molality is: 3,27moles of ethlyene glycol / (1,035kg + 0,203kg) = 2,64m

Replacing these values in (1):

X - 100°C = 0,52°C/m×2,64m

X - 100°C = 1,37°C

<em>X = 101,37°C</em>

<em></em>

I hope it helps!

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3 years ago
Platinum-189<br> What is the symbol
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platinum-189 symbol is PT

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How are protons and neutrons similar? How are they different?
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Protons and neutrons are in the center of the atom, making up the nucleus. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.
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Balance the following chemical reactions:
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1. 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

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4. MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂

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1)

NaCl+AgNO_3=>NaNO_3+AgC\downarrow

2)

CuSO_4+Cu_2Cl_2\neq>

CuSO_4+Cu_2l_2\neq

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Which number is different for isotopes of the same element?
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D number of protons or atomic mass

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