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3 years ago

Which element have zero valency

Chemistry

1 answer:

choli [55]3 years ago

4 0

The answer is Helium. hope its helpful (:

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A reaction takes place that results in an amount of 585 grams of product that is recovered. The theoretical amount calculates to

lisov135 [29]

Answer:

90%

Explanation:

Data obtained from the question include:

Actual yield = 585g

Theoretical yield = 650g

%yield =?

%yield = Actual yield /Theoretical yield x100

% yield = 585/650 x 100

% yield = 90%

7 0

3 years ago

How does changing the initial temperature of the copper affect how much heat energy it has?

taurus [48]

Answer:

the rock has a greater amount of heat energy which transfers to water causing vaporization.

5 0

2 years ago

What is the concentration of an unknown Mg(OH)2 solution if it took an average of 15.4mL of

vova2212 [387]

Answer:

0.077M

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

2HCl + Mg(OH)2 —> MgCl2 + 2H2O

From the balanced equation above,

The mole ratio of the acid (nA) = 2

The mole ratio of the base (nB) = 1

Step 2:

Data obtained from the question.

Concentration of base Cb =...?

Volume of base (Vb) = 10mL

Concentration of acid (Ca) = 0.1M

Volume of acid (Va) = 15.4mL

Step 3:

Determination of the concentration of the base, Mg(OH)2.

The concentration of the base can be obtained as follow:

CaVa/CbVb = nA/nB

0.1 x 15.4 /Cb x 10 = 2/1

Cross multiply to express in linear form

Cb x 10 x 2 = 0.1 x 15.4

Divide both side by 10 x 2

Cb = (0.1 x 15.4) /(10 x 2)

Cb = 0.077M

Therefore, the concentration of the base, Mg(OH)2 is 0.077M

7 0

3 years ago

Which color changes represent a positive reaction for the presence of starch using the iodine test?

-BARSIC- [3]

Looking at a ph level color chart, it should be moving to more acidic if it’s positive

3 0

3 years ago

The C=C bond in 2-cyclohexenone produces an unusually strong signal. Explain using resonance structuresBased on the above resona

frosja888 [35]

Answer:

When two single single bonds separated by a double bond (e.g C=C-C=C or C=C-C=O in the case of 2-cyclohexenone), the effect of resonance among those there bonds will be observed.

Explanation:

Since the Oxygen atom has higher electronegativity, it will cause the electrons in the resonance bonds 'flow' toward the Oxygen atom, so that the C=C will 'lose' some electron. The signal read for that bond will be different from other alkene structure.

Attachment is the resonance structure of 2-cyclohexene.

8 0

3 years ago