Can someone help me with 1 to 8 ? I will mark you Brainliest.

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 " .

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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:

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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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: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:

- 0.8217°C.

Explanation:

ΔTf = Kf.m,

ΔTf is the depression in the freezing point.

Kf is the molal freezing point constant for water (Kf = -1.86 °C/m).

m is the molality of glucose.

Molality (m) is the no. of moles of solute in 1.0 kg of solvent.

∴ m = (mass/molar mass) of glucose/(mass of water (kg))

∴ m = (19.5 g/180.156 g/mol)/(0.245 kg) = 0.4418 m.

∴ ΔTf = Kf.m = (-1.86 °C/m)(0.4418 m) = - 0.8217°C.

Answer:

Zinc is reduced.

The oxidation number of chlorine does not change.

Aluminum is oxidized.

Explanation:

2AI(s) + 3ZnCI₂(g) → 3Zn(s) + 2AICI₃(aq).

Al has (0) oxidation state and converted to (+3) oxidation state in the products (AlCl₃), which means Al is oxidized and it is the reducing agent.

So, we can check that: Aluminum is oxidized.

Zn has the oxidation state (+2) in the reactants side (ZnCl₂) and converted to (0) in the products side (Zn), which means that Zn is reduced and it is the oxidizing agent.

So, we can check that: Zinc is reduced.

and can not check: Zinc is the reducing agent.  

The oxidation state of Cl does not change, it is the same in both sides (-1).

So, we can check: The oxidation number of chlorine does not change.

and can not check: Aluminum atoms transfer electrons to chlorine atoms.

Zinc is reduced.

The oxidation number of chlorine does not change.

Aluminum is oxidized.

Answer: B, D,E

Explanation:

Answer:

Tetraoxosulphate vi acid (H2SO4)

Explanation:

Becauses it ionizes completely

Answer:

carborane acid

Explanation:

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

Answer:

0.823 g.

Explanation:

M = (no. of moles of K⁺)/(Volume of the solution (L).

∵ no. of moles of K⁺ = (mass/molar mass) of K⁺.

∴ M = (mass/molar mass) of K⁺/(Volume of the solution (L).

M = 0.0044 M.

Volume of the solution = 4785.0 mL = 4.785 L.

mass of K⁺ = ??? g.

molar mass of K⁺ = 39.01 g/mol.

∴ mass of K⁺ = (M)((molar mass of K⁺)(volume of the solution (L)) = (0.0044 M)(39.10 g/mol)(4.785 L) = 0.823 g.

Answer:

Place two of them as reactants.

Explanation:

1) N₂(g ) + O₂(g) → 2NO(g).

2) 2NO(g )+ O₂(g) → 2NO₂(g).

N₂(g ) + 2O₂(g) → 2NO₂(g).

NO is cancelled out because there is one in each equation in the products side in eq. 1 and in oriduct side in eq. 2.

So, we place two of oxygen as reactants.

Answer:

Place two of them as reactants

Explanation:

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:

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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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:

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

Answer:

PH of the weak acid: approximately 2.513.

PH of the buffer solution: approximately 4.495.

Explanation:

The Ka value of benzoic acid is much smaller than 1. Benzoic acid will dissociate but only partially when dissolved in water. Construct a RICE table for this process. Let the equilibrium of [tex]\rm H^{+}[/tex] be [tex]x\; \rm mol\cdot L^{-1}[/tex]. Note that [tex]x \ge 0[/tex].

[tex]\displaystyle \begin{array}{c|ccccc}\textbf{R}&\mathrm{C_6H_5COOH} & \rightleftharpoons & \mathrm{C_6H_5COO^{-}} & + &\mathrm{H^{+}}\\\textbf{I} & 0.015 & & 0 & & 0\\\textbf{C} & -x & & +x & & +x\\\textbf{E} & 0.015-x & & x & & x\end{array}[/tex]

[tex]\displaystyle \frac{[\mathrm{C_6H_5COO^{-}}]\cdot [\mathrm{H^{+}}]}{[\mathrm{C_6H_5COOH}]} = \mathrm{pK}_{a}[/tex].

[tex]\displaystyle \frac{x^{2}}{0.015 - x} = 6.4\times 10^{-5}[/tex].

Solve this quadratic equation for [tex]x[/tex]:

[tex]x^{2}+ 6.4\times 10^{-5}\;x - 6.4\times 10^{-5}\times 0.150 = 0[/tex].

[tex]\displaystyle x = \frac{-6.4\times 10^{-5} \pm \sqrt{(6.4\times 10^{-5})^{2} - 4\times (- 6.4\times 10^{-5}\times 0.150)}}{2}[/tex].

Take only the non-negative root. [tex]x \approx 0.00306655[/tex].

[tex]\rm [H^{+}] = 0.00306655\; mol\cdot L^{-1}[/tex].

[tex]\displaystyle \mathrm{pH} = -\log_{10}{[\mathrm{H^{+}}]} = 2.513[/tex].

Each benzoic acid contains only one carboxyl group [tex]\mathrm{-COOH}[/tex]. Benzoic acid is thus a monoprotic acid. Each mole of the acid will react with only one mole of [tex]\rm NaOH[/tex]. The 100 mL solution initially contains [tex]1.50\times 10^{-3}[/tex] moles of benzoic acid. The [tex]1\times 10^{-3}[/tex] moles of [tex]\rm NaOH[/tex] will neutralize only part of the acid. The solution will eventually contain [tex]1\times 10^{-3}[/tex] moles of [tex]\mathrm{C_6H_5COO^{-}}[/tex] (from the salt [tex]\mathrm{C_6H_5COONa}[/tex]) and [tex]0.50\times 10^{-3}[/tex] moles of [tex]\mathrm{C_6H_3COOH}[/tex].

Both the acid [tex]\mathrm{C_6H_5COOH}[/tex] and the conjugate base of the acid [tex]\mathrm{C_6H_5COO^{-}}[/tex] exist in large amounts in the solution. Apply the Henderson-Hasselbalch equation for weak acid buffers to find the pH of this buffer solution.

[tex]\mathrm{pK}_{a} = -\log_{10}{\mathrm{K}_{a}} \approx 4.19382[/tex] for benzoic acid.

[tex]\begin{aligned}\mathrm{pH} &= \mathrm{pK}_{a} + \log{\frac{{[\text{Conjugate Base}]}}{[\text{Weak Acid}]}} \\ &= \mathrm{pK}_{a} + \log{\frac{{[\mathrm{C_6H_5COO^{-}}]}}{[\mathrm{C_6H_5COOH}]}}\\ &= 4.19382 + \log{\frac{0.01}{0.005}}\\ &\approx 4.495 \end{aligned}[/tex].

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:

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: 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:

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:

32.5kg

Explanation:

if 1kg = 1000g,

then xkg=32500g

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

Answer: Melting

Explanation: Just confirming the other answer

This equation described is of Melting.

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a. The quantity of heat in Joules is equal to 1,305.832 Joules.

b. The quantity of heat in Calories is equal to 312.10 Cal.

Given the following data:

Scientific data:

To determine the quantity of heat in Joules:

Mathematically, quantity of heat is given by the formula;

[tex]Q=mc\theta[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]Q = 28.4 \times 2.09 \times (-1.0 -[-23.0])\\\\Q=59.356 \times (-1.0+23.0)\\\\Q=59.356 \times22[/tex]

Quantity of heat, Q = 1,305.832 Joules.

In Calories:

[tex]Calories =\frac{1305.832}{4.184}[/tex]

Calories = 312.10 Cal.

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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:

[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.

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.