Write the correct Lewis dot structure for O2. Which statement correctly describes the structure of the whole molecule? A. There is a single bond, a double bond, and six lone pairs. B. There is a single bond and four lone pairs. C. There is a single bond and six lone pairs. D. There is a double bond and six lone pairs.

Answer:

A) True/True

Explanation:

Non spontaneous exothermic reactions need to reach the activation energy to get started (like all non spontaneous reactions), usually this energy is given in the form of heat.  So you can say the second statement is True

The first one is also True, if you don't give some energy (heat) to a non spontaneous reaction it won't start. Never the less, exothermic reaction's conversion of equilibrium is decreased when heat is addeed to the system.

The balanced chemical equations for heating copper sulfides such as covellite and chalcocite with oxygen to form copper oxides and sulfur dioxide gas.

Copper sulfides, such as CuS (covellite) or Cu2S (chalcocite), are often heated with oxygen to change them to copper oxides. This reaction also forms sulfur dioxide gas. The balanced chemical equation for this reaction with covellite is:

2 CuS + 3 O2 → 2 CuO + 2 SO2

And for chalcocite:

2 Cu2S + 3 O2 → 2 Cu2O + 2 SO2

Answer:

3

Explanation:

Firstly, we need to define the phenomenon know as isomerism. It is a phenomena in which 2 or more organic compounds have the same molecular formula but different structural arrangements.

In this special case of pentane, we are looking at other compounds whose molecular formulas are also C5H12 but have a different structure from that of pentane. It must be noted that two isomers might belong to the same homologous series or belong to a different homologous series entirely.

The first isomer is 2-methylbutane also known trivially as isopentane. It has the same molecular formula as said earlier with a methyl group substituted for a hydrogen atom on the second carbon of the principal chain of the molecule.

The second one is n-pentane itself. This is the normal straight chain pentane in its linear form.

The third one is 2-ethylpropane or dimethylpropane trivially knows as neopentane.

Pentane (C₅H₁₂) has three structural isomers: pentane, isopentane, and neopentane. These isomers differ in their carbon chain arrangement and have distinct properties, including boiling points. This brings the total number of structural isomers to three.

Pentane (C₅H₁₂) is a straight-chain hydrocarbon with a molecular formula that allows for three structural isomers. These isomers are:

Therefore, besides the straight-chain version (pentane), there are two additional structural isomers for pentane, bringing the total number of isomers to three. Each of these isomers possesses unique properties, such as different boiling points: pentane (36.1°C), isopentane (27.7°C), and neopentane (9.5°C).

Answer:

Mass of Ag₂S which is produced, 2.29 g

Mass of reactant in excess (S₈) which is left unreacted, 1.70g

Explanation:

The balanced reaction is this:

16 Ag (s)  +  S₈ (s)   →    8Ag₂S (s)

Molar mass of sulfur: 2g / 256.48 g/m = 0.00779 moles

Molar mass of silver: 2 g / 107.87 g/m = 0.0185 moles

For 16 moles of silver, I need 1 mol of S

For 0.0185 moles of Ag, I will need ( 0.0185 / 16) = 0.00116 moles

If I need 0.00116 moles of S, and I have 0.00779 moles it means, that S is my reactant in excess so the limiting reagent is the Ag.

Let's verify:

1 mol of S are needed to make react 16 moles of Ag

0.00779 moles of S, will need ( 0.00779 .16 ) = 0.124 moles of Ag

(I only have 0.0185 moles of Ag)

So the Ag is the limiting reactant, now we can calculate the mass of formed product:

16 moles of Ag, produce 8 moles of Ag₂S

0.0185 moles of Ag will produce (0.0185  .8)/ 16 = 0.00925 moles of Ag₂S

To find out the mass, let's multiply moles . molar mass

0.00925 m . 247.8 g/m = 2.29 g

Mass of the excess, which is left unreacted:

0.00779 m - 0.00116m = 0.00667 moles

0.00667m . 256.48 g/m = 1.70 g

Final answer:

To find the mass of Ag2S produced, determine the limiting reactant using mole ratios and convert the masses of Ag and S8 to moles. Then use the molar ratios in the balanced equation to calculate the mass of Ag2S produced. The mass of the unreacted reactant can be found by subtracting the mass of Ag2S produced from the initial mass of the reactant.

Explanation:

To determine the mass of Ag2S produced, we need to find the limiting reactant first. The balanced equation shows that the molar ratio of Ag to Ag2S is 16:8. Using the given masses of Ag and S8, we can convert them to moles, and based on the molar ratios, find the amount of Ag2S produced. Using the molar masses of Ag and S, which are 107.87 g/mol and 256.52 g/mol respectively, we calculate:

a. Mass of Ag2S = moles of Ag * (8 moles of Ag2S / 16 moles of Ag) * molar mass of Ag2S
b. The mass of the unreacted reactant can be calculated by subtracting the mass of Ag2S produced from the initial mass of the reactant.

Answer:

The hydrolysis rate is significantly low because the energy of the transition state for hydrolysis is significantly high

Explanation:

In the given problem,  It was stated that the peptide bond is not stable thermodynamically. Peptide bonds are typically formed between molecules with carboxyl groups and molecules with amino groups. Therefore, it can be inferred that the hydrolysis rate is significantly low because the energy of the transition state for hydrolysis is significantly high.

Answer:

Intermolecular

Explanation:

When a gas is cooled, attractive forces between molecules increases as the temperature is reduced and the average kinetic energy of the molecules decreases, intermolecular attraction becomes more significant and the gas condenses to liquid.

The change from gaseous Cl2 to liquid Cl2 when cooled is due to intermolecular forces, which are the attractions between Cl2 molecules and are weaker than the intramolecular forces that bond atoms within a molecule.

The transition of gaseous Cl2 into a liquid when cooled involves forces known as intermolecular forces, which are attractions between molecules. These are different from intramolecular forces, which are the bonds that hold atoms together within a molecule. When Cl2 is cooled, the kinetic energy of its molecules decreases, allowing the intermolecular forces to bring them closer together, resulting in a liquid state. It's important to differentiate between these two types of forces, as intermolecular forces govern changes of state, such as from gas to liquid, whereas intramolecular forces are responsible for holding the atoms within a single molecule together and require significantly more energy to break.

Answer:

Empyrical formula is CH₂

Explanation:

A compound of carbon and hydrogen which has a molar mass of 42 g/m, is the  propene, alkene of 3 carbons.

CH₂ == CH --- CH₃

As the molecular formula is C₃H₆, the empyrical formula (which is the simplest chemical formula with the minimum amount in whole numbers between its atoms ) is CH₂

Answer:

The coefficient of oxygen in the balanced equation is equal to 3.

Explanation:

The combustion reaction of ethanol in the "gasohol" produces carbon dioxide and water as follows:        

CH₃CH₂OH + O₂ → CO₂ + H₂O       (1)      

To find the coefficient of oxygen in equation (1), we need to balance it. The balanced reaction is the next:

CH₃CH₂OH + 3O₂ → 2CO₂ + 3H₂O      

In the balanced equation, we have the same number of carbon, hydrogen, and oxygen atoms in the products than in the reactants. Therefore, the coefficient of oxygen in the balanced equation is equal to 3.  

I hope it helps you!          

Final answer:

The coefficient of oxygen in the balanced chemical equation for the combustion of ethanol is 3.

Explanation:

The combustion of ethanol, C₂H₅OH, when it is blended with gasoline to make 'gasohol' involves a reaction with oxygen to produce carbon dioxide and water.

The balanced chemical equation for this combustion is C₂H₅OH(l) + 3O₂(g) --> 2CO₂(g) + 3H₂O(g).

Therefore, the coefficient of oxygen in the balanced equation is 3, indicating that three molecules of diatomic oxygen are required for the complete combustion of one molecule of ethanol.

Answer : The number of electrons transferred are, 10

Explanation :

Rules for the balanced chemical equation in acidic solution are :

First we have to write into the two half-reactions.

Now balance the main atoms in the reaction.

Now balance the hydrogen and oxygen atoms on both the sides of the reaction.

If the oxygen atoms are not balanced on both the sides then adding water molecules at that side where the less number of oxygen are present.

If the hydrogen atoms are not balanced on both the sides then adding hydrogen ion [tex](H^+)[/tex] at that side where the less number of hydrogen are present.

Now balance the charge.

The given balanced redox reaction is,

[tex]2MnO_4^-(aq)+10Br^-{aq)+16H^+(aq)\rightarrow 2Mn^{2+}(aq)+5Br_2(aq)+8H_2O(l)[/tex]

Step 1: Separate the skeleton equation into two half-reactions.

Oxidation : [tex]Br^-\rightarrow Br_2[/tex]

Reduction : [tex]MnO_4^-\rightarrow Mn^{2+}[/tex]

Step 2: Balance all atoms other than H and O.

Oxidation : [tex]2Br^-\rightarrow Br_2[/tex]

Reduction : [tex]MnO_4^-\rightarrow Mn^{2+}[/tex]

Step 3: Balance O.

Oxidation : [tex]2Br^-\rightarrow Br_2[/tex]

Reduction : [tex]MnO_4^-\rightarrow Mn^{2+}+4H_2O[/tex]

Step 4: Balance H.

Oxidation : [tex]2Br^-\rightarrow Br_2[/tex]

Reduction : [tex]MnO_4^-+8H^+\rightarrow Mn^{2+}+4H_2O[/tex]

Step 5: Balance the charge.

Oxidation : [tex]2Br^-\rightarrow Br_2+2e^-[/tex]

Reduction : [tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]

Step 6: Equalize electrons transferred.

Oxidation : [tex]2Br^-\rightarrow Br_2+2e^-[/tex]    × 5

Reduction : [tex]MnO_4^-+8H^++5e^-\rightarrow Mn^{2+}+4H_2O[/tex]   × 2

and,

Oxidation : [tex]10Br^-\rightarrow 5Br_2+10e^-[/tex]

Reduction : [tex]2MnO_4^-+16H^++10e^-\rightarrow 2Mn^{2+}+8H_2O[/tex]

Step 7: Add the two half-reactions.

[tex]2MnO_4^-(aq)+16H^+(aq)+10Br^-(aq)\rightarrow 2Mn^{2+}(aq)+8H_2O(l)+5Br_2(aq)[/tex]

In this reaction, there are 10 number of electrons transferred.

Hence, the number of electrons transferred are, 10

The total number of electrons transferred in the reaction is 10.

The number of electrons transferred can be given by half reactions:

Oxidation reaction: [tex]\rm Br^-\rightarrow\;Br_2[/tex]

Reduction reaction : [tex]\rm MnO_4^-\;\rightarrow\;Mn^2^+[/tex]

The transfer of electrons can be balanced with the addition of a water molecule to the reaction. If the hydrogen atoms are not balanced on both sides then add hydrogen ion at that side where the less number of hydrogen is present. The electron transfer will be:

Oxidation reaction : [tex]\rm 2\;Br^-\;\rightarrow\;Br_2\;+\;2\;e^-[/tex]

Reduction reaction : [tex]\rm MnO_4^-\;+\;H^+\;+\;5\;e^-\;\rightarrow\;Mn^2^+\;+\;2\;H_2O[/tex].

By balancing the equation and electron transfer:

[tex]\rm 2\;MnO_4^-\;+\;16\;H^+\;10\;Br^-\;\rightarrow\;2\;Mn^2^+\;8\;H_2O\;+\;5\;Br_2[/tex]

The total number of electrons transferred in the reaction is 10.

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Answer:

Alloy

Explanation:

Alloy: An alloy is a substance prepared by adding one or more element to a base or parent metal to obtain desirable products. The added element are usually metals or carbon. An alloy can be considered as a uniform mixture.

Examples of Alloy:

⇒ Brass is an alloy that contains 60 - 80% of copper and 20- 40% of zinc.

⇒Bronze is an alloy that contains 90% of copper and 10% of tin.

⇒ Steel is an alloy that contains  99.8% of iron and 0.2% of carbon.

Uses of Alloys:

⇒ They are used for making coins and medals

⇒ They are used in the construction of aircraft, ships and cars.

⇒They are used for making electromagnet.

Answer:

When cation of metal and anion of non metal are combine they form salt.

Explanation:

When cation of metal and anion of non metal are combine they form salt. Consider the example of sodium chloride.

Sodium chloride is salt and also an ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations and form salt sodium chloride.

Salt is formed during the neutralization reaction of acid and base.

For example:

When sodium hydroxide and hydrochloric acid react they form sodium chloride and water.

NaOH + HCl →  NaCl + H₂O

Answer:

salt is a rock

Explanation:

Answer:

0.78 M

Explanation:

First, we need to know which is the value of Kc of this reaction. In order to know this, we should take the innitial values of N2, O2 and NO and write the equilibrium constant expression according to the reaction. Doing this we have the following:

N2(g) + O2(g) <------> 2NO(g)   Kc = ?

Writting Kc:

Kc = [NO]² / [N2] * [O2]

Replacing the given values we have then:

Kc = (0.6)² / (0.2)*(0.2)

Kc = 9

Now that we have the Kc, let's see what happens next.

We add more NO, until it's concentration is 0.9 M, this means that we are actually altering the reaction to get more reactants than product, which means that the equilibrium is being affected. If this is true, in the reaction when is re established the equilibrium, we'll see a loss in the concentration of NO and a gaining in concentrations of the reactants. This can be easily watched by doing an ICE chart:

      N2(g) + O2(g) <------> 2NO(g)

I:      0.2        0.2                 0.9

C:     +x         +x                   -2x

E:    0.2+x    0.2+x             0.9-2x

Replacing in the Kc expression we have:

Kc =  [NO]² / [N2] * [O2]

9 = (0.9-2x)² / (0.2+x)*(0.2+x)   ----> (this can be expressed as 0.2+x)²

Here, we solve for x:

9 = (0.9-2x)² / (0.2+x)²

√9 = (0.9-2x) / (0.2+x)

3(0.2+x) = 0.9-2x

0.6 + 3x = 0.9 - 2x

3x + 2x = 0.9 - 0.6

5x = 0.3

x = 0.06 M

This means that the final concentration of NO will be:

[NO] = 0.9 - (2*0.06)

[NO] = 0.78 M

Answer:

1013.32 J/kg.K

Explanation:

The heat transferred by a changing in temperature without phase change can be calculated by:

Q = m*c*ΔT

Where m is the mass, c is the specific heat, and ΔT is the change in temperature (final - initial).

The values of c for water and copper can e found in thermodynamics tables:

cwater = 4.19x10³ J/kg.K

ccopper = 0.39x10³ J/kg.k

By the conservation of energy:

Qwater + Qcopper + Qmaterial = 0

0.200*4.19x10³*(26.1 - 19.0) + 0.150*0.39x10³*(26.1 - 19.0) + 0.085*c*(26.1 - 100) = 0

5949.8 + 415.35 - 6.2815c = 0

6.2815c = 6365.15

c = 1013.32 J/kg.K

The specific heat capacity of the unknown material is 1013.32 J/kg°C.

A calorimeter is used to measure the specific heat capacity of an unknown material. The calorimeter contains 0.200 kg of water and 0.150 kg of copper. A 0.085-kg sample of the unknown material is dropped into the calorimeter, and the temperature of the calorimeter increases from 19.0°C to 26.1°C. The specific heat capacities of water and copper are 4186 J/kg°C and 385 J/kg°C, respectively.

Heat transfer equation: Q = m * c * ΔT

Values of c for water and copper:

c_water = 4.19e3 J/kg°C

c_copper = 0.39e3 J/kg°C

Conservation of energy: Q_water + Q_copper + Q_material = 0

Calculations:

0.200 * 4.19e3 * (26.1 - 19.0) + 0.150 * 0.39e3 * (26.1 - 19.0) + 0.085 * c_material * (26.1 - 100) = 0

5949.8 + 415.35 - 6.2815c = 0

6.2815c = 6365.15

c_material = 1013.32 J/kg°C

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The question probable may be;

The complete question is: A laboratory technician drops a 0.0850-kg sample of unknown solid material, at 100.0∘C, into a calorimeter. The calorimeter can, initially at 19.0∘C, is made of 0.150 kg of copper and contains 0.200 kg of water. The final temperature of the calorimeter can and contents is 26.1∘C. Compute the specific heat of the sample.

Most nonmetals are gases at room temperature. This statement accurately describe nonmetals

Nonmetals are periodic table elements that lack the characteristic properties of metals. They can be found in the upper right-hand corner of the periodic table, to the right of the zigzag line that divides metals and nonmetals. Nonmetals are easily formed and moldable. False; nonmetals are brittle and typically break when moulded or shaped. At normal temperature, the majority of nonmetals are gases. That is correct.

Oxygen, nitrogen, and carbon dioxide are a few examples. Under pressure, nonmetals easily fracture. True, however nonmetals are often brittle in their solid state and hence cannot resist pressure without deforming. At room temperature, the majority of nonmetals are liquids. This is not correct. The majority of nonmetals do not exist in liquid form. They exist in both gaseous and solid states.

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Answer:

The needed electrons, N = 4 for silicon (Si)

and N = 1 for chlorine (Cl).

Explanation:

Si has atomic number 14 and belongs to group 14  and 3 period.

The electronic configuration of Si is 1s²2s²2p⁶3s²3p².

so, there are 4 electrons in valence shell i.e) third shell (n=3)

so, according to Lewis it needs 4 more electrons to get stability via octet configuration.

Cl has atomic number 17 and belongs to group 17 and 3 period.

The electronic configuration of Cl is 1s²2s²2p⁶3s²3p⁵.

so, there are 7 electrons in valence shell i.e) third shell (n=3)

so, according to Lewis it needs 1 more electrons to get stability via octet configuration.

So, in order to get stability 4 Cl atoms form 4 covalent bonds with 1 Si atom

In a Covalent bond, electrons are shared. so, now both Si and Cl have octet configuration.

Answer:

True

Explanation:

The wind speed to be considered a tornado is 40 to 72 mph

Answer:

40% of the hurricane that occur in the United states hit Florida . the difference between a tropical storm and a

hurricane is wind speed – tropical strom usually bring wind of 36 to 47 mph where as hurricane winds speed are at least 74 mph

Answer:

There is 89.9 kJ of heat evolved in the combustion

Explanation:

Step 1: Data given

Mole fraction of CH4 = 0.830

Mole fraction of C2H6 = 0.112

Mole fraction of C3H8 = 0.058

Volume = 2.15 L

Temperature = 24.5 °C = 297.65 Kelvin

744 mmHg is burned

The combustion of methane (CH4) releases 891 kJ of energy

The combustion of ethane (C2H6) releases 1561 kJ of energy

The combustion of propane (C3H8) releases 2220 kJ of energy

Step 2: Calculate number of moles of

p*V= n*R*T

⇒ p = The pressure = 744 mmHg = 744/760 = 0.979 atm

⇒ V = the volume = 2.15 L

⇒ n= The number of moles = TO BE DETERMINED

⇒ R = the gas constant = 0.08206 L*atm/k*mol

⇒ T = The temperature = 24.5 °C = 297.65 Kelvin

n(total) = PV / RT = (0.979 *2.15 ) /  (0.08206 * 297.65 )

n(total) = 0.0862 moles

Step 3: Calculate energy for combustion of each gas

CH4: 0.0862 moles * 0.830 * 891 kJ/mol =  63.7 kJ

C2H6: 0.0862 moles * 0.112 * 1561 kJ/mol = 15.07 kJ

C3H8: 0.0862 moles * 0.0580 * 2220 kJ/mol = 11.1 kJ

Step 4: Calculate tot heat for the combustion

63.7 kJ + 15.07 kJ  + 11.1 kJ = 89.9 kJ total

There is 89.9 kJ of heat evolved in the combustion

Answer : The correct option is, (e) eg = trigonal planar, mg = trigonal planar

Explanation :

Formula used  :

[tex]\text{Number of electron pair}=\frac{1}{2}[V+N-C+A][/tex]

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

The given molecule is, [tex]CH_3^+[/tex]

[tex]\text{Number of electron pair}=\frac{1}{2}\times [4+3-1]=3[/tex]

That means,

Bond pair = 3

Lone pair = 0

The number of electron pair are 3 that means the hybridization will be [tex]sp^2[/tex] and the electronic geometry of the molecule will be trigonal planar.

Hence, the electron geometry (eg) and molecular geometry (mg) of [tex]CH_3^+[/tex]  is, trigonal planar and trigonal planar respectively.

Final answer:

The electron geometry of CH3+ is tetrahedral, and the molecular geometry is trigonal planar, due to there being three regions of electron density around the central carbon atom with no lone pairs.

Explanation:

The electron geometry (eg) of CH3+ is determined by the number of regions of electron density around the central carbon atom, which in this case is three bonded groups and no lone pairs. This corresponds to tetrahedral electron-pair geometry. However, since one of the positions is not occupied by electrons due to the positive charge, the molecular geometry (mg) is trigonal planar.

Therefore, the correct answer for the electron geometry and molecular geometry of CH3+ is:

eg = tetrahedral

mg = trigonal planar

Answer:

Explanation:

As the problem states that we have STP, these conditions are 1 atm of pressure and 273 K of temperature.

Now, the equation we must use to solve this:

PV = nRT

Solving for V:

V = nRT/P

Where:

V: Volume in Liters

n: moles of the tin block

T: temperature in K

P: Pressure in atm

R: gas constant which is 0.082 L atm / K mol

But also the problem is giving us the density data for all elements. In the case of Tin it is 7.31 g/cm³ or 7.31 g/mL, so, with the formula of density:

d = m/V  ----> V = m/d

From the above formula, we can calculate the volume of tin so:

V = 95.04 / 7.31

V = 13 mL

This would be the volume of the tin block, but, we have this block at STP so we need to calculate the volume with the ideal gas equation above. We need the molecular mass of Tin which is 118.71 g/mol, so let's calculate the moles:

n = m/MM

n = 95.04 / 118.71 = 0.8 moles

Now, solving for V:

V = 0.8 * 0.082 * 273 / 1

V = 17.91 L

And this would be the volume of the tin block at STP conditions.

Final answer:

To find the mole fraction of methanol in the solution, calculate the moles of methanol and water in the mixture. The mole fraction of methanol is 0.4.

Explanation:

To find the mole fraction of methanol in the solution, we need to calculate the moles of methanol and water in the mixture. The formula for mole fraction (X) is the moles of the component divided by the total moles in the solution.

First, we calculate the moles of methanol by dividing the mass of methanol by its molar mass:

Moles of methanol = 128 g / 32.04 g/mol = 4 mol

Next, we calculate the moles of water by dividing the mass of water by its molar mass:

Moles of water = 108 g / 18.02 g/mol = 6 mol

The total moles in the solution is the sum of the moles of methanol and water:

Total moles = 4 mol + 6 mol = 10 mol

Finally, we can calculate the mole fraction of methanol:

Mole fraction of methanol = Moles of methanol / Total moles = 4 mol / 10 mol = 0.4

The mole fraction of methanol in the solution is 0.4.

Answer:

-0.129V

Explanation:

The change in free energy is obtained from the given parameters after which the value is now applied to obtain the cell potential in volts from the formukar shown in the solution below.

Answer: D

Explanation:

The molecular theory of gases states that there are no intermolecular forces between gases. Gas molecules are separated from each other such that individual molecules are far apart from each other. When volume is increased, gas molecules spread out from each other and the distance between them increases thus approximating the situation in ideal gases.

Final answer:

The behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the average distance between molecules becomes greater.

Explanation:

The behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased at constant temperature because the average distance between molecules becomes greater. In an ideal gas, the molecules are assumed to have zero volume, while in real gases, the molecules have small but measurable volumes. As the volume of the gas increases, the intermolecular distances become larger, reducing the frequency of molecule-wall collisions. This behavior is described by Avogadro's law, which states that increasing the number of gas molecules requires a proportional increase in the container volume to yield a constant number of collisions per unit wall area per unit time.

Answer:

Natural Gas

Explanation:

Naturally occurring hydrocarbon gas are popularly referred to as natural gas or fossil gas. It components include majorly methane gas, other higher alkanes, little percentage of CO₂, N₂, H₂S (hydrogen sulfide) etc. They are produced as a result of exposure of  plant and animal matter to intense heat and pressure under the surface of the Earth over millions of years.When fossil gas/natural gas are burned, they release no sulphur content and there is usually a higher net energy yield than other fossil fuels.

Natural gas is a non-renewable hydrocarbon used as a source of energy such as electric generation, fuels for vehicles etc due to their higher net energy yield.

Answer:

ΔE = -2661 KJ/mole

ΔH = -2658 KJ/mole

Explanation:

ΔH = q - PΔV

ΔE = q + w

First, to find ΔE:

The reaction PRODUCES 2658 kJ of h (q), and does 3 kJ of work (w).

2658 kJ(q) + 3 kJ(w) = 2661 kJ, BUT the reaction PRODUCES heat, which means ΔE is negative.

ΔE = -2661 KJ/mole

Second, to find ΔH:

ΔH = q - PΔV

ΔH = 2658 kJ(q) - PΔV

Now, the question states that butane burns at a constant pressure; that just translates to the pressure of the reaction is equal to 0.

ΔH = 2658 KJ(q) - (0)ΔV

ΔH = 2658 KJ - 0

ΔH = 2658 kJ, BUT, like before, the reaction PRODUCES heat, which also mean ΔH is negative.

ΔH = -2658 KJ/mole

I hope this helped! Have a nice week.

Answer:

1. Amplitude 2. Wavelength 3.Pressure

Explanation:

I just did the quiz

A loud sound has a large amplitude. Wavelength is the distance between two peaks or crests. Sound waves are a type of radiation  wave.

Sound is defined in physics as a vibration that travels as just an acoustic wave through with a data transmission like a gas, liquid, or solid. Sound is the receipt of such waves as well as their perception even by brain in human physiology as well as psychology.

A loud sound has a large amplitude. Wavelength is the distance between two peaks or crests. Sound waves are a type of radiation  wave.

Therefore, a loud sound has a large amplitude. Wavelength is the distance between two peaks or crests. Sound waves are a type of radiation  wave.

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Final answer:

Sulfuric acid is used in automobile batteries and it acts as an electrolyte to allow the flow of electrons. In our bodies, acids and bases maintain pH balance and facilitate biochemical reactions. Acid rain can cause damage to buildings, vegetation, and ecosystems. Water is a substance that is neither an acid nor a base. The pH scale measures the concentration of hydrogen ions in a solution. Litmus paper is used to determine if a compound is an acid or base.

Explanation:

The acid used in automobile batteries is sulfuric acid (H2SO4). The sulfuric acid acts as an electrolyte, which allows the flow of electrons between the battery's positive and negative terminals. When the battery discharges, chemical reactions occur that convert the sulfuric acid into lead sulfate and water.

In our bodies, acids and bases play important roles in maintaining pH balance and facilitating various biochemical reactions. For example, the stomach produces hydrochloric acid (HCl) to help digest food, while bicarbonate ions (HCO3-) act as a base to neutralize excess acid in the blood.

Acid rain is harmful because it contains high levels of sulfuric acid (H2SO4) and nitric acid (HNO3). These acids can damage buildings, vegetation, and aquatic ecosystems.

A substance that is neither an acid nor a base is water (H2O). Water is considered neutral because it has an equal number of hydrogen ions (H+) and hydroxide ions (OH-).

The pH scale measures the concentration of hydrogen ions (H+) in a solution. The scale ranges from 0 to 14, with 7 being neutral. The lower the pH, the higher the hydrogen ion concentration and the more acidic the solution.

Litmus paper is a pH indicator used to determine if a compound is an acid or base. It changes color depending on the pH of the solution. If the strip turns red, it indicates an acid. If it turns blue, it indicates a base.

In addition to litmus paper, other devices that can determine an accurate measurement of pH include pH meters and pH strips that provide a more precise numerical value for the pH of a solution.

Answer:

The larger person will have to get a larger parachute. The answer is D

Explanation:

If the smaller person does nothing, the larger person subsequently accelerate for more time and with larger terminal velocity. In this case the person needs to do something so as to reduce the terminal velocity and can also effectively raise the air resistance. For this reason the person should get a bigger parachute. The air resistance in the opened parachute overwhelms the downward force of the gravity. Whereas the net force as well as the acceleration of the person is upward. The bigger parachute has the ability to grab the greater force. If the parachute, dragging force works in the opposite to that of the force of the gravity, hence the drag force slows the parachute decrease as they fall.

Explanation:

Metals in their solid form contain free electrons( mobile in nature), these free electrons are responsible for electricity conduction in solids metals.

Whereas in ionic compounds ions are stationary and they do not conduct electricity, however, their when dissolved in water, their ions dissociate and they start conducting electricity.

Answer:

The answer to your question is below

Explanation:

There are 4 types of chemical reactions:

- Synthesis is when two elements or compounds form only one compound.

- Decomposition is when 1 compound is broken into 2 or more products.

- Single replacement is when one element is replaced by another element.

- Double replacement is when the cations of two compounds are interchanged.

1.- Decomposition                      2 Al₂O₃    ⇒    4 Al   +  3O₂

2.- Single replacement          Mg  +  2HNO₃   ⇒   Mg(NO₃)₂   +  H₂

3.- Combustion                      2C₆H₆  +  15O₂   ⇒   12CO₂   +   6H₂O

4.- Synthesis                          2Ag   +   S   ⇒   Ag₂S

5.- Double replacement      3Ca(OH)₂   + 2H₃PO₄   ⇒   Ca₃(PO₄)₂  + 6 H₂O

Answer:

Covalent bond

Explanation:

Ionic bond- When 1 atom totally transfers 1 or more electron to another atom in order to reach stability.

Covalent bond- Is when 2 atoms share there electrons instead of transferring them so they both would be at a stable configuration.