3 years ago

Which of the following CANNOT be used as a conductor? Copper Water Paper Gold

Chemistry

1 answer:

vladimir1956 [14]3 years ago

7 0

The answer is copper

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Which allotrope of carbon has the shape of a soccer ball?

Vadim26 [7]

C. ) Fullerene has the shape like soccer ball

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3 years ago

Laura sees a horse pulling a buggy.

Tcecarenko [31]

Answer:

Explanation:

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2 years ago

How many grams of NaF form when .508 mol of HF react with excess Na2SiO3?

jonny [76]

2HF + Na2SiO3 ----> 2NaF + H2SiO3 is the balanced equation.

2 moles of HF form 2 moles of NaF

therefore 0.508 Mol HF forms 0.508 mol of NaF

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= 0.508 (22.99+19)
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8 0

4 years ago

A different brand of iron tablet was analysed by Hitration with 0.0093 mol.L" potassium

Gre4nikov [31]

The concentration of iron used in the titration : 0.009 M

<h3>Further explanation</h3>

Given

Reaction

Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ ⇒ 2Cr³⁺ + 6Fe³⁺ + 7H₂O

0.0093 mol/L potassium dichromate

200 cm³ of dilute acid, 25cm³ was used in the titration.

Required

the concentration of iron

Solution

Titration formula

C₁V₁n₁=C₂V₂n₂⇒ From equation : n₁=6n₂(1=Cr₂O₇, 2=Fe)

titration average : 33+32.05+32.15+32.1 / 4 = 32.325 cm³(ml)

25 cm³ of iron solution used in titration :

$\tt V_1=32.325~ml\\\\V_2=25~ml\\\\C_1=0.0093~M\\\\\\\\C_1.V_1.n_2=C_2.V_2.n_1\\\\0.0093\times 32.325\times 6=C_2\times 25\times 1\\\\C_2=0.07215~M$

Dilution(25 ml from 200 ml iron solution)

$\tt C_2.V_2=C_1.V_1\\\\0.007215\times 25=C_1\times 200\\\\C_1=0.009~M$

4 0

3 years ago

During a qualitative analysis experiment a student found his unknown salt to contain mn2 and po43- ions. write the chemical form

MrMuchimi

The ions in the unknown salt are:

$Mn^{2+}$ and $PO_{4}^{3-}$

The chemical formula of the salt is determined as shown in the picture.

The chemical formula of the salt is $Mn_3(PO_{4})_{2}$ .

3 0

3 years ago