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2 years ago

What must always be true if a covalent bond is to be polar?

Chemistry

2 answers:

scZoUnD [109]2 years ago

8 0

Answer:

If a covalent bond is polar the electronegativity difference between the elements of the compound is between 0.4 and 1.7

Explanation:

The electronegativity measures the power of an atom to attract electrons; if the electronegativity difference between the elements of the compound is big (more than 1.7) the compound will be ionic, that means, an atom or a group of atoms will give electrons and another atom of group of atoms will receive them; if the electronegativity difference is small (less than 0.4), the electrons will be shared by the atoms in a equitative way, i. e. the electrons will spend similar amount of time in the orbitals of each atom; but if the electronegativity difference is between 0.4 and 1.7 a covalent polar bond will be formed, that means valence electrons will spend more time in the orbitals of the most electronegative element.

Aleksandr [31]2 years ago

4 0

N a polar covalent bond, the electrons shared by the atoms spend a greater amount of time, on the average, closer to the Oxygen nucleus than the Hydrogen nucleus. This is because of the geometry of the molecule and the great electronegativity difference between the Hydrogen atom and the Oxygen atom.

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When C2H5Cl(g) is burned in oxygen, chlorine gas is produced in addition to carbon dioxide and water vapor. 5145 kJ of heat are

Arisa [49]

Answer: The chemical equation is written below.

Explanation:

Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule.

$\text{hydrocarbon}+O_2\rightarrow CO_2+H_2O$

The chemical equation for the combustion of ethyl chloride follows:

$4C_2H_5Cl+13O_2\rightarrow 2Cl_2+8CO_2+10H_2O$

We are given:

When 4 moles of ethyl chloride is burnt, 5145 kJ of heat is released.

For an endothermic reaction, heat is getting absorbed during a chemical reaction and is written on the reactant side.

$A+\text{heat}\rightleftharpoons B$

For an exothermic reaction, heat is getting released during a chemical reaction and is written on the product side

$A\rightleftharpoons B+\text{heat}$

So, the chemical equation follows:

$4C_2H_5Cl+13O_2\rightarrow 2Cl_2+8CO_2+10H_2O+5145kJ$

Hence, the chemical equation is written above.

7 0

2 years ago

What mass of powdered drink mix is needed to make a 0.5 M solution of 100 mL?

Maru [420]

Answer:

There is 17,114825 g of powdered drink mix needed

Explanation:

Step 1 : Calculate moles

As given, the concentration of the drink is 0.5 M, this means 0.5 mol / L

Since the volume is 100mL, we have to convert the concentration,

⇒0.5 / 1 = x /0.1 ⇒ 0.5* 0.1 = x = 0.05 M

This means there is 0.05 mol per 100mL

Step 2 : calculate mass of the powdered drink

here we use the formula n (mole) = m(mass) / M (Molar mass)

⇒ since powdered drink mix is usually made of sucrose (C12H22O11) and has a molar mass of 342.2965 g/mol.

0.05 mol = mass / 342.2965 g/mol

To find the mass, we isolate it ⇒0.05 mol * 342.2965 g/mol = 17,114825g

There is 17,114825 g of powdered drink mix needed

3 0

2 years ago

Read 2 more answers

Watch the video to determine which of the following relationships correctly depict the relationship between pressure and volume

AnnZ [28]

Answer : The correct options are,

(B) $V\propto \frac{1}{P}$

(C) $P\propto \frac{1}{V}$

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$

or,

$V\propto \frac{1}{P}$

The relation between the pressure and volume of two gases are:

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure of gas

$P_2$ = final pressure of gas

$V_1$ = initial volume of gas

$V_2$ = final volume of gas

5 0

2 years ago

Certain glass objects are not meant to be heated and could shatter if exposed to a heat source. What two examples of heat-sensit

Stels [109]

Answer: the heat-sensitive glassware that were given are : Volumetric and Graduated cylinder.

Explanation:glass material that reacts to ambient temperatures radiated off of other surfaces like hands or water is known as heat sensitive glassware. They are not meant to be heated and could shatter if exposed to a heat source. Examples from the video includes Volumetric and Graduated cylinder. Hope this helps. Thanks.

8 0

2 years ago

4.82 g of an unknown metal is heated to 115.0∘C and then placed in 35 mL of water at 28.7∘C, which then heats up to 34.5∘C. What

nikitadnepr [17]

Answer: The specific heat of metal is 2.34 J/g°C

Explanation:

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

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