______ hydrocarbons are organic compounds that consist of hydrocarbons to which one or more functional groups have been substituted for one or more hydrogen atoms or carbon groups.

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

New growth of trees is an exception

Explanation:

when volcanoes erupt, they release hot magma that is destructive to the environment causing personal damage, lack of breathable air and death.

heat produce cannot in any way help in growth of trees

The dry density is approximately 1.76 g/cm^3. The porosity is approximately 0.162 or 16.2%, the void ratio is approximately 0.193, The degree of saturation (S) is 0.844.


(i) To determine the dry density, we need to consider the mass of solid particles only. The dry density (yd) can be calculated using the following formula:

yd = yt / (1 + (w/100))

Given:

Wet density (yt) = 2.1 g/cm^3

Water content (w) = 19%

Substituting the values into the formula:

yd = 2.1 / (1 + (19/100)) = 2.1 / (1 + 0.19) = 2.1 / 1.19 ≈ 1.76 g/cm^3

Therefore, the dry density is approximately 1.76 g/cm^3.

(ii) To determine the porosity, we can use the relationship between porosity (n) and the dry density (yd) and wet density (yt):

n = (yt - yd) / yt

Substituting the values:

n = (2.1 - 1.76) / 2.1 = 0.34 / 2.1 ≈ 0.162

Therefore, the porosity is approximately 0.162 or 16.2%.

(iii) The void ratio (e) can be calculated using the formula:

e = n / (1 - n)

Substituting the value of porosity (n):

e = 0.162 / (1 - 0.162) ≈ 0.193

Therefore, the void ratio is approximately 0.193.

(iv) The degree of saturation (S) can be calculated using the formula:

S = (wt - w) / (Gw)

Given:

Water content (w) = 19%

Water content of fully saturated soil (wt) = 100%

Specific gravity of water (Gw) = 1

Substituting the values:

S = (1 - 0.19) / (1 * 0.19) ≈ 0.844

Therefore, the degree of saturation is approximately 0.844 or 84.4%.


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The train cars moves in the same direction when the engine car begins

moving to the left.

The law of magnetism states that like poles repel and unlike poles attract.

In substances which have magnetic field, they are known to attract each

other.

The engine and train car are highly magnetized which results in them

moving in the same direction when they are in close contact with one

another.

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Lab equipment refers to the tools and devices used in a laboratory setting for scientific research and experiments. There are many different types of lab equipment, each designed for specific tasks and purposes.

One type of lab equipment is glassware. This includes items such as test tubes, flasks, pipettes, and beakers. Glassware is used for holding and measuring liquids, as well as for mixing and heating them.

Another type of lab equipment is apparatus for heating and cooling. This includes items such as hot plates, Bunsen burners, and refrigerators. These devices are used for controlling the temperature of substances in the lab.

Lab equipment also includes instruments for measuring and analyzing substances. This includes items such as balances for measuring mass, spectrophotometers for analyzing the intensity of light, and microscopes for viewing small objects.

In addition to these general types of lab equipment, there are also many specialized tools and devices used in specific areas of research. For example, in a biology lab, you might find equipment such as centrifuges for separating liquids, PCR machines for amplifying DNA, and electrophoresis apparatus for separating biological molecules.

Lab equipment plays a crucial role in the success of scientific experiments and research. Without the proper tools and devices, scientists would be unable to accurately measure, analyze, and manipulate the substances they are studying.

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Answer:

1. The solubility of a gas in water increases with an increase in pressure

Explanation:

The balanced equation for the combustion of gaseous propane (C₃H₈) with gaseous oxygen (O₂)  to form gaseous carbon dioxide and gaseous water is C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g).

To write a balanced equation for the combustion of gaseous propane (C₃H₈) with gaseous oxygen (O₂), forming gaseous carbon dioxide (CO₂) and gaseous water (H₂O), follow these steps:

1. Write the unbalanced equation: C₃H₈ (g) + O₂ (g) → CO₂ (g) + H₂O (g)

2. Balance the carbon atoms by placing a coefficient in front of CO₂: C₃H₈ (g) + O2 (g) → 3CO₂ (g) + H₂O (g)

3. Balance the hydrogen atoms by placing a coefficient in front of H₂O: C₃H₈ (g) + O2 (g) → 3CO₂ (g) + 4H₂O (g)

4. Finally, balance the oxygen atoms by placing a coefficient in front of O₂: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g)

So, the balanced equation for the combustion of gaseous propane is C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (g).

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The carbonyl group in a ketone is bonded to two hydrogen atoms. In a ketone, the carbonyl group consists of a carbon atom double-bonded to an oxygen atom (C=O).

The remaining two valence electrons of the carbon atom are occupied by two other substituents or groups. These can be alkyl or aryl groups, and they can be the same or different. The carbonyl group in a ketone is not directly bonded to any hydrogen atoms. It consists of a carbon atom double-bonded to an oxygen atom (C=O) with two other substituents or groups attached to the carbon atom. These substituents can be alkyl or aryl groups. Therefore, the correct answer is that the carbonyl group in a ketone is bonded to zero hydrogen atoms.

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Answer:

They are single celled organisms and they are microscopic

Explanation:

Answer:

shear adhesion

Explanation:

edge

Shear adhesion sticks best when it is pulled down parallel to the surface.

Shear adhesion is defined as the ability  of tape due to which it resists the static forces which are applied in same plane as in backing.It is usually expressed in terms of time required  by a given weight for an amount of tape to become loose  from a vertical plane.

Molecular weight between two entanglements is the controlling factor of shear adhesion. Shear adhesion is affected by the following parameters which areas follows:

1)Tg of adhesive - Shear adhesion increases as Tg rises up to a certain temperature which is less than the room temperature.

2)  Tan delta  minimum value of adhesive- It is found that shear adhesion improves by an increase in tan delta minimum value.

3)Adhesive polarity- It is an important factor which affects adhesion  such as tack,peel and shear.Adhesion performances are improved by introducing polar ingredients in the formulation.

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1) It would shift to the left at high temperature and low pressure

2) C and D are affected by a  change in pressure.

A chemical reaction is said to be in equilibrium when the concentrations of its reactants and products stop fluctuating over time, indicating that both the forward and reverse processes are progressing at the same pace.

The equilibrium position of the reaction would change when there is a change in the system via the imposition of a constraint on the reaction system in equilibrium.

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In electrolysis the flow of electrons occurs from Anode (Positively Charged electrode) towards Cathode (Negatively charged electrode).

Therefore Diagram A shows the correct flow of electron in an electrolysis

Chemical decomposition produced by passing an electric current through a Electrolytic (Salt) solution containing ions.

Anode is located at the left hand side of the electrolytic cell where as cathode is located at the right hand side of the electrolytic cell.  

Therefore, In the given diagrams, Diagram A follows the above mentioned pattern.

Hence, It shows the correct direction of electron flow in an electrolytic cell.

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The specific heat capacity of the ethanol, given that the ethanol absorbs 43338 joules of heat is 2.44 J/gK

We shall begin our calculation by listing out the given parameters from the question. Details below:

The specific heat capacity of the ethanol can be obtain as follow:

Q = MCΔT

43338 = 545.5 × C × 32.56

43338 = 17761.48 × C

Divide both sides by 17761.48

C = 43338 / 17761.48

C = 2.44 J/gK

Thus, we can conclude that the specific heat capacity of ethanol is 2.44 J/gK

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2 moles of ammonia and 2.5 moles of oxygen gas will produce 2 moles of nitric oxide and 3 moles of water.

The reaction between ammonia (NH3) and oxygen gas (O2) to produce nitric oxide (NO) and water (H2O) is shown below:4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)The balanced equation shows that 4 moles of ammonia react with 5 moles of oxygen gas to produce 4 moles of nitric oxide and 6 moles of water. To determine the amount of products formed when a certain amount of reactants is used, we need to use stoichiometry.Suppose we react 2 moles of ammonia with 2.5 moles of oxygen gas. From the balanced equation, we can see that the ratio of moles of ammonia to moles of oxygen gas is 4:5. Therefore, ammonia is the limiting reagent because only 2 moles of ammonia are available, which is not enough to react with 2.5 moles of oxygen gas.To determine the amount of products formed, we will use the mole ratio from the balanced equation:4 moles NH3 : 5 moles O2 : 4 moles NO : 6 moles H2O2 moles NH3 is equivalent to (5/4) × 2 moles O2 = 2.5 moles O2So, 2 moles NH3 + 2.5 moles O2 → 2 moles NO + 3 moles H2O.The number of significant digits in the answer will depend on the number of significant digits in the given amounts of reactants.

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The best technique for mixing color to create a nice medium green color is to mix equal parts of blue and yellow paint.

When mixing colors, it is important to understand the color wheel and the primary colors. The primary colors are red, blue, and yellow. By mixing two primary colors together, you can create the secondary colors.

In this case, if you mix blue and yellow paint together, you will create a medium green color. However, you should experiment with the ratios of blue and yellow paint until you achieve the desired shade of green. Additionally, you can also add small amounts of other colors such as white or black to adjust the value and saturation of the green color.

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The pH of an aqueous solution with a [H3O+] concentration of 2.5 x 10^-4 M can be calculated using the formula pH = -log[H3O+]. In this case, the pH of the solution is 3.60.

The pH of a solution is a measure of its acidity or basicity and is determined by the concentration of hydrogen ions ([H+]) or hydronium ions ([H3O+]) present in the solution. The relationship between pH and [H3O+] is given by the equation pH = -log[H3O+].

In this case, the concentration of [H3O+] is given as 2.5 x 10^-4 M. Plugging this value into the pH equation, we have pH = -log(2.5 x 10^-4) = 3.60.

Therefore, the pH of the given aqueous solution is 3.60.

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The pH of the given aqueous solution  is approximately 3.60.

What is PH?

The pH stands for potential of hydrogen and  is a measure of the acidity or alkalinity of a solution. It is a logarithmic scale used to express the concentration of hydrogen ions ([H+]) in a solution. The lower the pH value, the more acidic the solution, and the higher the pH value, the more alkaline or basic the solution.

The pH of a solution is defined  of hydronium ions ([\(H_3O+\)]) concentration in the solution.

Given [\(H_3O+\)] = 2.5 x \(10^{-4}\) M, we can determine the pH using the formula:

pH = -log10([\(H_3O+\)])

pH = -log10(2.5 x \(10^{-4}\))

Therefore:

pH = -log10(2.5) - (-4)

= -log10(2.5) + 4

pH ≈ 3.60

Therefore, the pH of the given aqueous solution for which [\(H_3O+\)] = 2.5 x \(10^{-4}\) M is approximately 3.60.

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It would require 46434 calories of heat to boil 142 g of ammonia.

When a liquid changes form into a gas, the process is called vaporization. You can watch vaporization when you boil a pot of water. Vaporization happens in two ways: evaporation and boiling. Evaporation occurs when sunlight shines on water until it changes to vapor and rises into the air

To calculate the amount of heat required to boil 142 g of ammonia, NH3, we can use the formula:

Heat = mass x heat of vaporization

where the mass is 142 g and the heat of vaporization is 327 cal/g.

Therefore, the heat required to boil 142 g of ammonia is:

Heat = 142 g x 327 cal/g

Heat = 46434 cal

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The correct statements that describe the procedure for drawing a Lewis structure are:

c. For a neutral molecule, the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure.

e. An electron is added to the total count for each negative charge on the species.

a. This assertion is untrue. If two atoms are joined by a bond, a single bond representing two electrons should be placed between them; however, not every pair of atoms in the Lewis structure must be linked by a connection.

b. This assertion is untrue. Since they increase the number of valence electrons and have an impact on the overall structure, nonbonding electrons, sometimes referred to as lone pairs, should be included in the Lewis structure.

d. This assertion is untrue. Halogen atoms are typically not positioned in the structure's center. The arrangement of formal charges of the atoms in a molecule and their overall electronegativity determine where they are placed in a Lewis structure.

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To draw a Lewis structure, you should place single bonds between atoms, include nonbonding electrons, and use the sum of the valence electrons for a neutral molecule.

The correct statements that describe the procedure for drawing a Lewis structure are:

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The risk assessment team, consisting of various members from different departments within the winery, conducted a comprehensive assessment of the potential risks associated with sulfur dioxide (SO2) and dimethyl dicarbonate (DMDC) operations.

Data was collected regarding the equipment, chemicals, procedures, training, incident history, and physical attributes of the workplace. The team also interviewed employees to gather their experiences, concerns, and suggestions.

After reviewing the collected information, the team identified the potential risks of fatalities or serious incidents related to workplace exposures of SO2 and DMDC. These risks were considered of utmost priority and required immediate control to ensure an acceptable level of safety. The consultant highlighted the importance of addressing these serious risks, as fatality and serious incident rates have not shown a decline and demand serious attention.

Factors contributing to the potential for environmental releases, explosions, and disasters were identified, including unusual and nonroutine work, nonproduction tasks, facility modification or construction activities, shutdowns and startups for repair and maintenance tasks, exposure to high-energy sources (such as electrical, steam, pneumatic, chemical), and situations transitioning from normal to abnormal (upsets).

Based on the assessment and the identified risks, it is crucial for the winery to implement effective control measures to minimize the potential for fatalities, serious incidents, and environmental disasters. These measures may include improving procedures, enhancing operator training, implementing stricter safety protocols, and ensuring proper handling and storage of chemicals.

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Understanding the relationship between reactants and products in a reaction is crucial for understanding chemistry. That is what stoichiometry is.

It is a quantitative relationship between the mass (and thus the number of moles) of different products and reactants in a chemical reaction.

Chemical reactions must be balanced, or in other words, the products and reactants must both contain the same number of different atoms.

A chemical reaction cannot yield any knowledge about the relationship between its products and reactants if it is not balanced. In order to balance a chemical reaction, you should do so initially.

By placing coefficients in front of the reactants and products, we may balance processes. The stoichiometric coefficients are these values.

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Work allows energy to be transferred from one object to another. To do work, an agent must exert a force on an object over a long distance.

When work is done, energy is transferred from the agent to the object, resulting in a change in the motion of the object (more specifically, a change in the object's kinetic energy).

What is energy?

Energy is essential to human society and has numerous health benefits. However, each energy source poses some health risks. This article examines the health consequences of each major source of energy, focusing on those with the greatest global impact on disease burden. The harvesting and burning of solid fuels, coal, and biomass have the greatest health consequences, primarily in the form of occupational health risks and household and general ambient air pollution. In the world's poorest households, a lack of access to clean fuels and electricity poses a particularly serious health risk. Although energy efficiency has many advantages, energy use is essential to human society and has numerous health benefits.

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Answer:

D Trigonal pyramidal

Explanation went over in class:

Answer:

D. Trigonal pyramidal

Explanation:

A P E X !

Answer:

The three-point test

Explanation:

The three-point test refers to a ground test utilizing an auxiliary current electrode and an auxiliary potential electrode.

Answer: The most likely base is an amine or an organic base with a pKa value of approximately 6.4.

To determine the most likely base, one must examine the shape of the titration curve obtained from the titration of 1.000 g of a weak base with HCl. The shape of the curve would give an insight into the identity of the weak base.

The following information can be deduced from the given titration curve: The equivalence point (stoichiometric point) is located at approximately pH 6.4. This corresponds to the neutralization of the weak base with HCl to form the salt of the weak base.

At pH <6.4, the weak base is partially protonated (acidic) and exists in a conjugate acid form. When the pH is greater than 6.4, the weak base is partially deprotonated (basic) and exists in the conjugate base form.

In conclusion, the most likely base is an amine or an organic base with a pKa value of approximately 6.4.

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Answer:

The first one is correct, 4.03 x 10^24.

D: For OH3-, three plausible resonance configurations exist. B: C6H5NO2 For C6H5NO2, there are two plausible resonance configurations. E: C7H5O2- C7H5O2 has five plausible resonance configurations.

Alternative Lewis structures for a molecule or an ion are called resonance structures, and they merely change in the way the electrons are arranged. The electronic distribution, stability, and reactivity of the molecule are all influenced by these hypothetical versions of the molecule, which are represented by these structures. Understanding the behaviour of molecules like benzene, nitrate ions, and carbonate ions that have numerous bonds or delocalized electrons requires knowledge of resonance structures. The most stable and likely structure for a molecule or ion can be found by taking into account all potential resonance structures. Double-headed arrows are frequently used to represent resonance structures, indicating that the actual molecule's structure is a composite of all conceivable resonance forms.

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Yes , the chemist can answer if the compound in K2O or K2O2

The chemical formula and composition of both the compounds is entirely different. The compound K2O2 has an additional molecule of oxygen than K2O and hence will have have higher molecular mass.

In the compound K2O

molecular mass= 2x 39+16 =94

mass ratio of K in compound= 78/94 = 0.830

In the compound K2O2

molecular mass= 2x 39+16X2 =110

mass ratio of K in compound= 78/110 = 0.710

and hence by the required ratio while extracting K , the chemist may know if the compound is K20 or K2O2

If the ratio is anything different from 0.830 and 0.710 then the compund will be something different

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Answer:

Aquatic life

Elevation

Salinity

Temperature

Explanation:

Aquatic life- animals living in water use up dissolved oxygen.

Elevation- the amount of oxygen in elevation increases.

Salinity- Salty water holds less oxygen than fresh water.

Temperature- cold water holds more dissolved oxygen than warm water.