Carbon has four valence electrons, and chlorine has seven valence electrons. If carbon covalently bonds with chorine, which of the following would represent the Lewis dot (electron dot) structure?

Answers

Answer 1

Answer:

Answer: The correct answer is Image 3.

Explanation:

Lewis dot structure is defined as the structure which represents the number of valence electrons around the atom. The electrons are represented as dots.

From the structure, we can easily determine the number of bonding and non-bonding electrons. Non-bonding electrons are considered as lone pair of electrons.

Carbon is the 6th element of the periodic table having electronic configuration of $1s^22s^22p^2$

This element has 4 valence electrons.

Chlorine is the 17th element of the periodic table having electronic configuration of $1s^22s^22p^63s^23p^5$

This element has 7 valence electrons.

The lewis dot structure for the compound $CCl_4$ is given below in the image attached.

Hence, the correct answer is Image 3.

Answer 2

Answer: 1. It is wrong because each chlorine atom should have 3 lone pairs
2. It is wrong because carbon only has four valence electrons
3. It is correct because each chlorine has 3 lone pairs and carbon has 4 electrons covalently bonded with chlorine
4. It is wrong because chlorine only has 7 valence electrons and therefore it cannot have 3 lone pairs and 2 bond pairs for each of C-Cl bonds

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Which reaction occurs at the cathode in an electrochemical cell?(1) combustion (2) neutralization (3) oxidation (4) reduction

Answers

The correct answer is option 4. The reaction occurring in the cathode is a reduction reaction. No matter what type of electrochemical cell it is, electrolytic or voltaic, oxidation reaction always happen in the anode while reduction always happens in the cathode.

Which element (Na or Cl) is more likely to steal an outer electron from the other?

Answers

Answer:

Cl is more likely to than Na

Explanation:

The question asks for the element more take up an electron from the other

The ability of an atom to take take or give electrons in a chemical reaction, depends on its electron affinity and ionization energy, respectively

Chlorine, Cl, has the highest electron affinity in the periodic table which makes it attract electrons more towards itself

Sodium, Na, has a low ionization energy (about 2/5 of that of chlorine) than chlorine, Cl, making sodium more readily able to give its valence electron in a reaction

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A solution of copper sulfate (CuSO4) produced by bioleaching has a concentration of 0.319 g/dm3 Relative atomic masses (Ar): Cu = 63.5 O = 16 S = 32 Calculate the number of moles of copper that can be produced from 1 dm3 of this solution.

Answers

moles Cu produced : 0.002

Further explanation

Concentration of copper sulfate (CuSO₄) : 0.319 g/dm³

MW CuSO₄ :

$\tt =63.5+32+4* 16=159.5~g/mol$

mol CuSO₄ /dm³ :

$\tt (0.319)/(159.5)=0.002$

CuSO₄⇒Cu²⁺ + SO₄²⁻

mol Cu : mol CuSO₄ = 1 : 1 , so mol Cu²⁺=0.002

The density of an elemental gas is 1.7824 g/l at stp. what is the molar mass of the element. what is the element?

Answers

Answer: The molar mass of the element is 40 g/mol and element is Calcium.

Explanation:

At STP:

1 mole of a gas contains 22.4 L of volume

Molar mass is defined as the mass of 1 mole of a substance.

To calculate mass of of the substance, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Volume of gas = 22.4 L

Density of gas = 1.7824 g/L

Putting values in above equation, we get:

$1.7824g/L=\frac{\text{Mass of gas}}{22.4L}\n\n\text{Mass of gas}=(1.7824g/L* 22.4L)=39.9g\approx 40g$

The element having molar mass 40 g is Calcium.

Hence, the molar mass of the element is 40 g/mol and element is Calcium.

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During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring? 1)A solid forms, and there is a change of color. 2)A gas forms, and there is a change of color. 3)A solid forms, and light is emitted. 4)A gas forms, and light is emitted.

Answers

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Answers

Calcium hydroxide dissolves and dissociates according to:
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