Which type of bonding involves the complete transfer of a valence electron from a less electronegative atom to a more electronegative one?

Answer:

Dynamic equilibrium is a state in which reactant is converted into products at the same rate. At the beginning of a reaction, the reactants are converted to products and reaction goes into forwarding direction.

But in reversible reaction products start changing into reactants and reaction goes in the reverse direction until an equilibrium is reached. The state where the rates of all the reactants and products become equal and no more changes take place except the concentration is called dynamic equilibrium.

All the changes in dynamic equilibrium cancel out each other and the system seems to be at equilibrium.

Answer:

all the changes to a system cancel out

Explanation:

A P E X

Answer:

In materials of molecular structure, the nature of intermolecular and intramolecular bonds has a decisive influence on their characteristics and properties. Characteristics such as melting and boiling points, mechanical strength and hardness depend on the type of such bonds.

Answer:

Tetraoxosulphate vi acid (H2SO4)

Explanation:

Becauses it ionizes completely

Answer:

carborane acid

Explanation:

Answer:

d = m / v

Explanation:

This is the formula for density. d stands for density. m stands for mass. lastly, v stands for volume. just divide the mass by the volume and boom, you've got the density of an object ^-^

Answer:

nonpolar, trigonal planar and nonpolar

Explanation:

The borane molecule BH3 has nonpolar bonds due to the similar electronegativities of boron and hydrogen, a trigonal planar molecular shape, and is nonpolar overall due to its symmetrical structure.

Complete the paragraph to describe the characteristics of a borane molecule (BH3). The bond polarities in BH3 are nonpolar, the molecular shape is trigonal planar, and, due to its symmetry, the molecule is nonpolar.

The borane molecule, BH3, consists of a boron atom undergoing sp² hybridization. The boron atom is involved in three bonds with hydrogen atoms, resulting in a trigonal planar structure. This configuration uses three sp² hybrid orbitals where each of the boron's valence electrons pairs with a hydrogen electron, forming covalent bonds. Despite the polar bond character between boron and hydrogen, due to similar electronegativities of 2.04 for boron and 2.20 for hydrogen, the symmetry of the molecule ensures those individual dipoles cancel out, rendering the molecule nonpolar on the whole.

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Answer:  The answer is:  " 7.81 kg " .

___________________________________________________

Explanation:

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Note the exact conversion:   1000 g = 1 kg ;

0.00781 g = ? kg :

So:  To convert "0.0781 g" ; to "units in kg" ;

            →  we multiply the value:  0.00781 g ;  by "1000" ;

So:  Given:  " 0.00781 g " ;  

           →  we move the decimal point "3 (three) spaces forward" ;

   to get:  " 7.81 kg " .

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Hope this helps!

       Wishing you the best in your academic pursuits

              — and within the "Brainly" community!

___________________________________________________

Answer:

0.00000781kg

Explanation:

Final answer:

The equation exemplifies a combustion reaction, where an alcohol reacts with oxygen to produce carbon dioxide and water, commonly releasing heat and light.

Explanation:

The equation provided (2C₃H₅OH + 9O₂ ⇒ 6CO₂ + 8H₂O) is an example of a combustion reaction. In such a reaction, an organic compound (in this case, an alcohol) reacts with oxygen gas to produce carbon dioxide and water as products. Combustion reactions are commonly known for releasing energy in the form of heat and light, which is why they are often associated with burning.

In the combustion reaction given, C₃H₅OH (an alcohol) combusts in the presence of oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O). This type of reaction is easy to recognize because it typically involves a hydrocarbon (or another organic compound) and oxygen as reactants.

Examples of other types of reactions include:

Answer: Avogadro's Hypothesis simply states that all gases of equal volume have the same number of molecules.

Explanation: Avogadro's Hypothesis is an experimental gas law and it serves as a specific case of the ideal gas law. Mathematically,

Volume (V) is proportional to the Number of mole (n) of the gas

V/n = K

Where K is the constant of proportionality.

Avogadro's hypothesis states that equal volumes of gases contain the same number of particles. It is an important concept in the study of gases.

Avogadro's hypothesis states that equal volumes of gases, at the same temperature and pressure, contain the same number of particles. This hypothesis helps explain the concept of molar volume and is a fundamental principle in the study of gases. For example, 1 mole of any gas occupies the same volume as 1 mole of any other gas at the same temperature and pressure.

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Answer:

can you reverse the ashes back into wood? If you can't then it is irreversible

Answer:

32.5kg

Explanation:

if 1kg = 1000g,

then xkg=32500g

to convert, divide by 1000 32500/1000=32.5kg

Answer:

[tex]\boxed{\text{10 \%}}[/tex]

Explanation:

The formula for efficiency is  

[tex]\begin{array}{rcl}\text{Efficiency} & = & \dfrac{\text{useful energy out}}{\text{energy in}} \times 100 \,\% \\\\\eta & = & \dfrac{w_{\text{out}}}{w_{\text{in}} } \times 100 \,\%\\\end{array}[/tex]

Data:

Useful energy =  3 J

Energy input  = 30 J

Calculation:

[tex]\begin{array}{rcl}\eta & = & \dfrac{\text{3 J}}{\text{30 J}} \times 100 \,\%\\\\\eta & = & 10 \, \%\\\end{array}\\\text{ The efficiency is }\boxed{\textbf{10 \%}}[/tex]

The light bulb's efficiency is calculated as 10%, which is the ratio of the useful light energy output (3 joules) to the total energy input (30 joules) per second.

To calculate the efficiency of a light bulb, you need to compare the useful energy output to the total energy input. In this case, the bulb takes in 30 joules of energy per second and transfers 3 joules as useful light energy. The efficiency can be calculated using the formula:

Efficiency (%) = (Useful Energy Output / Total Energy Input) × 100

Plugging the given values into the formula, we get:

Efficiency (%) = (3 J / 30 J) × 100 = 10%

Therefore, the light bulb has an efficiency of 10%.

Answer:

Explanation:

Quick Answer: Likely fractional distillation.

The distillation taking place has heat that is not uniformly distributed. Hot air rises, so the temperature at the top is greated than at the bottom. When petroleum is distilled various organics come off at various temperatures and at different levels of distillery apparatus.

Cutting of Nails is a physical change since no new substance is formed.

Proper hand hygiene involves careful cleaning and trimming of the nails, which carry dirt and germs and can contribute to the spread of some infections such as helminths. The nails should be short and the underside should be cleaned frequently with soap and water.

For most people, if you don't trim your nails, your nails will be longer at first. “If you don't trim your nails, your nails will continue to grow,” he says. James Christina, Executive Director and CEO of the American Podiatric Medical Association. "It's like the hair on your head."

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Answer:

a thing that is composed of two or more separate elements; a mixture.

Explanation:

The teacher bought 20 cheaper calculators at $2.95 each after setting up and solving an algebraic equation that includes the total cost spent and the price of 40 more expensive calculators.

First, let's define the variables: Let x be the number of cheaper calculators that the teacher bought.

The problem states that the teacher bought 40 calculators at $8.20 each, so this cost is $8.20 times 40, and the other calculators cost $2.95 each, so this is $2.95 times x. The total cost is given to be $387.

We can set up the equation as follows:

$328 + $2.95x = $387

$2.95x = $387 - $328

$2.95x = $59

[tex]x = \frac{\$59}{\$2.95}[/tex]

x = 20

Therefore, the teacher bought 20 of the cheaper calculators.

Answer:

[tex]\boxed{\text{(D) Nine times the radius of the first orbit}}[/tex]

Explanation:

On the basis of Bohr's model, the radius of the nth orbit is  

r = a₀n²  

where a₀ is a constant called the Bohr radius.  

r₃\r₁ = (a₀ × 3)²/(a₀ × 1)² = 9/1 = 9

The radius of the third Bohr orbit is nine times the radius of the first orbit.

Answer:

The correct answer is option D.

Explanation:

Formula used for the radius of the [tex]n^{th}[/tex] orbit will be,

[tex]r_n=\frac{n^2\times 52.9}{Z}[/tex]   (in pm)

where,

[tex]r_n[/tex] = radius of [tex]n^{th}[/tex] orbit

n = number of orbit

Z = atomic number

Radius of the first orbit, n = 1

[tex]r_1=\frac{1^2\times 52.9}{Z}=\frac{1\times 52.9}{Z}[/tex]..[1]

Radius of the third orbit, n = 3

[tex]r_3=\frac{3^2\times 52.9}{Z}=\frac{9\times 52.9}{Z}[/tex]..[2]

[1] ÷ [2]

[tex]\frac{r_1}{r_3}=\frac{\frac{1\times 52.9}{Z}}{\frac{9\times 52.9}{Z}}[/tex]

[tex]r_1\times 9=r_3[/tex]

The radius of the 3rd orbit  is nine times the radius of first orbit.

Answer:

decrease

Explanation:

I assume you mean pH, the pH will decrease as there are more H+ ions inside the water

Answer:

dissolve i believe its been two years since i was in the class.

Explanation:

Answer:

A.) Each chlorine atom shares a pair of electrons with the sulfur atom.

There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. The melting and boiling points are higher in ionic compounds.

Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds.  SCI[tex]_2[/tex] is a covalent compound. During formation of SCI[tex]_2[/tex], each chlorine atom shares a pair of electrons with the sulfur atom.

Therefore, the correct option is option A.

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The properties of water that enables the water striders to walk across the surface of water is surface tension and adhesion.

Surface tension is a force that acts on the surface of water that makes it behave as if it is a stretched elastic skin. The ability of water molecules to stick to other surfaces is called adhesion.

As a result of surface tension and adhesion, insects such as  water striders are able to walk across the surface of water.

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Answer:

Explanation:

Rainwater harvesting is the accumulation and storage of rainwater for reuse on-site, rather than allowing it to run off. Rainwater can be collected from rivers or roofs, and in many places, the water collected is redirected to a deep pit (well, shaft, or borehole), a reservoir with percolation, or collected from dew or fog with nets or other tools. Its uses include water for gardens, livestock,[1] irrigation, domestic use with proper treatment, indoor heating for houses, etc. The harvested water can also be used as drinking water, longer-term storage, and for other purposes such as groundwater recharge.

Rainwater harvesting is one of the simplest and oldest methods of self-supply of water for households usually financed by the user.[2]

Answer:

Rainwater harvesting is discussed below.

Explanation:

Answer:The correct answer is C8H18.

Explanation:

Answer:

C₈H₁₈

Explanation:

Octane is an alkane which which is combustible in air.

The combustion of octane C₈H₁₈ in sufficient supply of oxygen produces carbon (IV) Oxide and water only.

Sufficient supply of oxygen ensures there is complete combustion of octane.

2C₈H₁₈ ₍l₎ + 25O₂₍g₎ → 16CO₂₍g₎ + 18H₂O₍l₎

Answer:

Concentration expressed in percent by volume by volume is 10%(v/v).

Explanation:

[tex]w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100[/tex]

[tex]w/v\%=\frac{\text{Mass of solute}}{\text{Volume of solution}}\times 100[/tex]

[tex]v/v\%=\frac{\text{Volume of solute}}{\text{Volume of solution}}\times 100[/tex]

Concentration expressed in percent by volume by volume is 10%(v/v).

The concentration expressed in percent by volume is 10% (v/v). This denotes that 10% of the total volume of the solution is made up of a particular solute.

Concentration expressed in percent by volume is represented as 10% (v/v). This means that the percentage is derived from the ratio of the volume of the solute to the volume of the solution, and then multiplied by 100 to get the percentage. For instance, if you have a solution with 10ml of ethanol mixed with 90ml of water, the volume ratio of ethanol to the total solution is 10ml/100ml=0.1, and when multiplied by 100 we get a 10% (v/v) ethanol solution. It's reflected as 10% of the total volume of the solution is comprising of the solute (ethanol).

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Answer:

=154.8 J

Explanation:

Change in enthalpy = MC∅ where M is the mass of the substance, C is the specific heat capacity and ∅ is the change in temperature.

Change in temperature = 100.0°C-20.0°C=80°C

ΔH=MC∅

The specific heat capacity of gold= 0.129 J/g°C

ΔH= 15.0g×0.129J/g°C×80°C

=154.8 J

To raise the temperature of a 15.0 gram sample of gold from 20.0°C to 100.0°C, approximately 154.8 joules of heat energy is required, using the formula q = mcΔT where c is the specific heat capacity of gold.

To calculate the heat needed to raise the temperature of gold, you can use the formula:

Q = mcΔT

Where Q is the heat, m is the mass of the gold, c is the specific heat capacity of gold, and ΔT is the change in temperature.

Calculate the change in temperature: ΔT = 100.0°C - 20.0°C = 80.0°C

Look up the specific heat capacity of gold, which is 0.129 J/g°C

Substitute the values into the formula: Q = 15.0g × 0.129 J/g°C × 80.0°C = 154.8 J

It is the Avogadro's law which explains the relationship between the number of moles and the volume. When the volume and the number of moles are constant then the pressure and temperature are constant.

The law states that equal volumes of all gases under the similar conditions of temperature and pressure contains equal number of molecules. The law can be mathematically expressed as:

V ∝ n

Here 'V' is the volume and 'n' is the number of moles.

It follows that the volume of a gas is directly proportional to the number of molecules. But the number of molecules (N) of a gas is directly proportional to the number of moles (n).

Thus when the volume and number of particles of a gas are constant then the pressure and temperature are also found to be constant.

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To find the current through the nightlight bulb, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). The current through the bulb is approximately 0.02917 Amperes, or 29.17 milliamperes (mA).

To find the current through the nightlight bulb, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the resistance is equal to the power (P) divided by the voltage (V). So, the current (I) can be calculated as follows:

I = P / V

Substituting the values given, we have:

I = 3.5 watts / 120.0 volts

Calculating this equation, we find that the current through the bulb is approximately 0.02917 Amperes, or 29.17 milliamperes (mA).

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Answer:

The correct answer is D: 16.4 g

Explanation:

Look at the balanced equation of NaBr, It has 1:1 between Na and Br.

NaBr ---> Na+ and Br-

If the solution has 0.245 concentration of bromide ions then the solution has 0.245 concentration of sodium ions as well. Which means both have equal concentration. So the molarity of solution is 0.245 M.

Convert volume in dm3.

650ml = 650 cm3  

650cm3/ 1000cm3 x 1dm3 = 0.65 dm3

Mass of a solute (g) = Molarity x Molar mass of solute x volume in dm3

                               = 0.245 M X 102.89 g/mol x 0.65 dm3

                             = 16.38 = 16.4 g

Answer:

The correct answer is D) 16.4.

The mass of sodium bromide in solution is 16.4 g

Further Explanation:

Molarity may be defined as the concentration of a solution in moles per liter. It is calculated by dividing the number of moles of a solution, n by its volume in liters, V. That is; Molarity = n/V

Therefore; when given the molarity of a solution and the volume of the solution then we can get the number of moles, by multiplying the molarity by volume; n = MV.

Additionally, the number of moles of a compound or an element can also be calculated by dividing the mass of the compound by its relative molecular mass.

In this question, we are given;

Molarity of a bromide ion = 0.245 M

But the dissociation of sodium bromide is;

NaBr(aq) → Na+(aq) + Br-(aq)

Therefore, the molarity of NaBr is 0.245 M since the mole ratio of NaBr : Br- is 1: 1.

Hence; Number of moles of NaBr = Molarity × volume

                                                        = 0.245 M × 0.650 L

                                                        = 0.15925 moles

But; number of moles = mass/ molecular mass

Molecular mass of NaBr is 102.894 g/mol

Therefore;

Mass of NaBr = Number of moles × molecular mass

                      = 0.15925 × 102.894 g/mol

                      = 16.385 g

                      ≈ 16.4 g

Thus, the mass of sodium bromide in solution is 16.4 g

Grade: Middle  School

Subject: Chemistry

Chapter: Mole and stoichiometry equations

Keywords: Molarity, moles, sodium bromide, molecular mass and volume.

Answer:

8.16%

Explanation:

We are to calculate the mass percent of hydrogen in Methyl Acetate.

We know that the formula of Methyl Acetate is [tex]C_3H_6O_2[/tex] so firstly we will find its molecular mass.

Molecular mass of  ([tex]C_3H_6O_2[/tex]) = [tex](12.01 \times 3)+(1.0 \times 6)+(15.9 \times 2)[/tex] = 74.08 g

Mass of Hyrdogen in ([tex]C_3H_6O_2[/tex]) = [tex]1.00784 \times 6[/tex] = 6.05 g

Mass percent of Hydrogen in Methyl Acetate = [tex]\frac{6.05}{74.08} \times 100[/tex] = 8.16%

Answer:

0.0116 mol.

Explanation:

It is known that at STP: 1 mol of any gas occupies 22.4 L.

Using cross multiplication:

1 mol of NH₃ occupies → 22.4 L.

??? mol of NH₃ occupies → (520 mL) 0.52 L.

∴ The no. of moles of (520 mL) NH₃ produced = (1 mol)(0.52 L)/(22.4 L) = 0.0232 mol.

3H₂ + N₂ → 2NH₃.

3 mol of H₂ react with 1 mol of N₂ to produce 2 mol of NH₃.

Using cross multiplication:

1 mol of N₂ produce → 2 mol of NH₃, from stichiometry.

??? mol of N₂ produce → 0.0232 mol of NH₃.

∴ The no. of moles of N₂ needed = (1 mol)(0.0232 mol)/(2 mol) = 0.0116 mol.

Approximately 0.0116 moles of nitrogen would react with excess hydrogen to produce 520 mL of ammonia. This calculation is based on the balanced equation N₂ + 3 H₂ → 2 NH₃ and the molar volume of a gas at STP. It ensures that the stoichiometric ratio is maintained.

First, let's recall the balanced chemical equation for the synthesis of ammonia:

N₂ + 3 H₂ → 2 NH₃

According to the balanced equation, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. Given that volume and moles correlate under ideal conditions (at STP - Standard Temperature and Pressure), 1 mole of gas occupies 22.4 liters (or 22,400 mL). To find the moles of ammonia produced, we can use the given volume:

Number of moles of ammonia (NH₃) = Volume of NH₃ / Molar volume at STP

= 520 mL / 22400 mL/mol

= 0.0232 moles of NH₃

From the stoichiometry of the reaction, 2 moles of NH₃ are produced from 3 moles of H₂ and 1 mole of N₂. Therefore, we need to find out how many moles of nitrogen (N₂) are required to produce 0.0232 moles of NH₃. Using the mole ratio from the balanced equation:

(1 mole of N₂) / (2 moles of NH₃) = x moles of N₂ / 0.0232 moles of NH₃

x = 0.0232 / 2

= 0.0116 moles of N₂

Thus, approximately 0.0116 moles of nitrogen would react with excess hydrogen to produce 520 mL of ammonia.

Answer:The appearance of lines in an emission spectrum is caused by the fact that light is released as an electron moves to a lower energy state. When the atoms absorb energy they get excited and reach a higher level of energy. Then, when those atoms that are unstable release energy they pass to a lower level and emit light.

The appearance of lines in an emission spectrum​ is caused by the gas cloud on its own, without a light source behind it.

Hence, the appearance of lines in an emission spectrum​ is caused by the gas cloud on its own, without a light source behind it.

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