More _____ is required to halogenate alkanes than to halogenate alkenes. activation energy ionization energy electronegativity nuclear energy

Answer:

An empty fuel tank can still contain "fumes"

Explanation:

Even if there is not enough liquid fuel, whatever is left in the tank creates fumes, which is more combustible than liquid gas.

Answer:

Fumes / vapors.

Explanation:

An empty tank appears to be non dangerous as it has no liquid fuel. However even if tank is empty there may be some drops of left over liquid fuel.

These drops make the container filled with dangerous vapors that are more prone to catch fire as compared to gasoline.

Even a small spark may cause a severe explosion.

Answer:

pH = 7.46.

Explanation:

H₂O(l) ⇄ H⁺(aq) + OH⁻(aq),

Kw = [H⁺][OH⁻] = 0.12 x 10⁻¹⁴.  

in pure water and neutral aqueous solution, [H⁺] = [OH⁻]  

So, Kw = [H⁺]²

∴ 0.12 x 10⁻¹⁴ = [H⁺]²

∴ [H⁺] = 3.4 x 10⁻⁸ M.

∵ pH = - log [H⁺]  

pH = - log (3.4 x 10⁻⁸) = 7.46.

Answer:

removing the Cl₂ as it is formed .

adding more ICl(s) .

removing some of the I₂(s).

Explanation:

Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.

1) Decreasing the volume of the container:

so, decreasing the volume of the container will decrease the total amount of Cl₂ produced.

2) Removing the Cl₂ as it is formed:

so, removing the Cl₂ as it is formed will increase the total amount of Cl₂ produced.

3) Adding more ICl(s) :

so, adding more ICl(s)  will increase the total amount of Cl₂ produced.

2) Removing some of the I₂(s):

so, removing some of the I₂(s) will increase the total amount of Cl₂ produced.

the following changes will increase the total amount of of Cl2 that can be produced:

The change that can increase the total amount of Cl2 produced would be the removal of Cl2 as it is being formed.

When a reaction is in equilibrium and one of the constraints that affect the rate of reactions is introduced, the equilibrium shifts so as to annul the effects of the introduced constraint.

Thus, if Cl2 is constantly being removed from the reaction vessels, the reaction will adjust in order to return to equilibrium, thus more Cl2 is produced.

More on equilibrium can be found here: https://brainly.com/question/13524990

Answer:

A dilute aqueous potassium nitrate solution is a homegeneous mixture.

Explanation:

Answer:

Neon is the least likely to undergo chemical reaction.

Explanation:

The other elements given in the option do not have 8 electrons in their outermost shell, so they will be quite willing to undergo chemical reactions in order to become stable.

Answer:

B. 78 °C.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat released from water (Q = - 1500 J).

m is the mass of water (m = 30.0 g).

c is the specific heat capacity of water (c = 4.18 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = final T - 90.0 °C).

∴ (- 1500 J) = (30.0 g)(4.18 J/g.°C)(final T - 90.0 °C)

∴ (final T - 90.0 °C) = (- 1500 J)/(30.0 g)(4.18 J/g.°C) = - 11.96°C.

∴ final T = 90.0 °C - 11.96°C = 78.04°C ≅ 78 °C.

So, the right choice is: B. 78 °C.

Answer:

78 °C

Explanation:

I took the test and got it correct. hope this helps

Answer:

Constant pressure

Explanation:

At constant pressure,

[tex]w = -p\Delta V = -p(V_{f} - V_{i})[/tex]

At constant temperature,

[tex]w = -RT \ln \left(\dfrac{V_{f}}{V_{i}} \right)[/tex]

1 mol of an ideal gas at STP has a volume of 22.71 L.

Let's compare the work done as it expands under each condition from an initial volume of 22.71 L.

Isobaric expansion

[tex]w = -100p(V_{2} - 22.71}); \text{(1 bar$\cdot$L = 100 J)}[/tex]

A plot of -w vs V₂ gives a straight line (red) with a constant slope of 100 J/L as in the diagram below (Note that w is work done on the system, so -w is the work done by the system). \

Isothermal expansion

[tex]w= -8.314 \times 273.15 \ln \left(\dfrac{V_{f}}{22.71} \right)\\\\= -2271 \left( \ln V_{f} -\ln22.71 \right)\\= -2271 \left(\ln V_{f} - 3.123 \right)\\= 7092 - 2271\ln V_{f}[/tex]

A plot of -w vs V₂ is a logarithmic curve. Its slope starts at 100 J/mol but decreases as the volume increases (the blue curve below).

Thus, the work done during an expansion at constant pressure is greater than if the system is at constant temperature.

Answer:

5.00g

Explanation:

Molarity is moles per liter

Therefore:

x moles/.250L = .5 moles/1L

Solve for x: .125 moles required

Question asks for grams of NaOH so multiply the moles by the molar mass of NaOH

.125(39.997) = 4.999625g

Rounds to 5.00g

Answer:

Explanation:

0.5 times 39.98(mass of NaOH) = 19.99.../ 0.25= 4.99 so 5.00

single atoms with more than one electron

Answer:

Explanation:

Bohr’s model could only explain the spectra of single atoms with one electron.

Bohr’s model:

It shows that the negatively charged electrons orbit the positively charged nucleus in a fixed circular path.

Therefore, Bohr’s model could only explain the spectra of single atoms with one electron.

To know more about Bohr’s model:

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Answer:

Leads

Explanation:

In the conductivity apparatus, you should never touch Leads while the power is on. Hence, option B is correct.

Lead (Pb) is a metal.

If a person touches a live conductor, a current may flow through the body to the ground and cause a shock.

That's why in the conductivity apparatus, you should never touch Leads while the power is on.

Hence, option B is correct.

Learn more about conductivity here:

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Answer:

C. it will increase at first, then remain constant

Explanation:

Answer:

B.

Explanation:

When we say "biosphere", we're referring to the atmosphere, geosphere, lithosphere and hydrosphere, and everything in them. You've probably heard of these in class as the "pillars of Earth" or the "pillars of our planet". In other words, when we talk about biosphere we're talking about life.

Organic compounds are all of the compounds that contain carbon, C, in them. You might know that CHNOPS* are the "7 molecules of life", and you might have noticed that Carbon stands first in the list, and that's not because it makes up a mnemonic, Carbon is indeed the most important one in many ways.

*Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus and Sulfur.

Hope it helped,

BiologiaMagister

Answer:

Organic :)

Explanation:

Answer:

1.11 Atm or 1.0168Atm or 841.168 Torr or 841 Torr

Explanation:

we are using Daltons partial pressure is equal to the sum of the partial pressures of the individual gases. you must convert the Torr to Atm

Answer:

1.13 M.

Explanation:

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

∵ no. of moles of luminol = (mass/molar mass) of luminol = (15.0 g)/(177.16 g/mol) = 0.085 mol.

Volume of the solution = 75.0 mL = 0.075 L.

∴ M = (no. of moles of luminol)/(Volume of the solution (L) = (0.085 mol)/(0.075 L) = 1.13 M.

Answer:

here are both natural and human sources of carbon dioxide emissions. Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.

Explanation:

The majority of the carbon dioxide emitted into the atmosphere comes from natural sources. The oceans emit the most carbon dioxide per year of any natural or human-caused source.

Carbon dioxide is naturally added to the atmosphere by organisms respiring or decomposing (decaying), carbonate rocks weathering, forest fires, and volcanoes erupting.

Carbon dioxide is also released into the atmosphere as a result of human activities such as the combustion of fossil fuels and the destruction of forests, as well as the manufacture of cement.

Electricity and heat, agriculture, mass transit, forestry, and manufacturing are the primary sources of greenhouse gas emissions worldwide. Energy production in general accounts for 72 percent of total emissions.

Natural sources account for the vast majority of carbon dioxide emissions into the atmosphere. The oceans transmit one of most Carbon dioxide per year of any natural or man-made source.

Thus, this is the natural processes that produce large quantities of carbon dioxide.

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Answer:

came

Explanation:

Answer:

400.0

Explanation:

I just got it right

Explanation:

isomers Chemical compounds having the same molecular formula but different properties due to the different arrangement of atoms within the molecules. Structural isomers haveatoms connected in different ways. Geometric isomers, also called cis-trans isomers, differ in their symmetry about a double bond.

Answer: Option (b) is the correct answer.

Explanation:

A geometric isomer is defined as an isomer that contains different arrangement of groups across the double bond, ring etc. Generally, coordination compounds show geometric isomers.

For example, cis-2,butene and trans-2,butene are geometrical isomers.

Geometrical isomers cause change in geometry of a compound. Due to this both physical and chemical properties of a substance changes.

On the other hand, structural isomers are the isomers that have same chemical formula but different structure due to different sequence of atoms present in the formula.

For example, butane and isobutane are structural isomers.

Therefore, we can conclude that geometric isomers only have different physical or chemical properties.     ty

Answer: The moles of given hydrocarbon is 0.3 moles

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We are given:

Given mass of ethane = 10.0 g

Molar mass of ethane = [tex][(2\times 12)+(6\times 1)]=30g/mol[/tex]

We need to divide the given value by the molar mass.

Putting values in above equation, we get:

[tex]\text{Moles of ethane}=\frac{10.0g}{30g/mol}=0.3mol[/tex]

In case of multiplication and division, the number of significant digits is taken from the value which has least precise significant digits. Here, the least precise number of significant digits are 1.

Hence, the moles of given hydrocarbon is 0.3 moles

Final answer:

To find the number of moles of C₂H₆ in a 10.0 g sample, calculate the molar mass (30.0 g/mol) and divide the sample mass by the molar mass, resulting in approximately 0.333 moles. The answer has three significant figures, aligning with the initial mass provided.

Explanation:

To find the number of moles in a 10.0 g sample of C₂H₆, first, calculate the molar mass of C₂H₆. The molar mass is found by summing the atomic masses of all atoms in the molecule, which are 2 atoms of Carbon (C) and 6 atoms of Hydrogen (H). The atomic mass of Carbon is 12.0 g/mol and that of Hydrogen is 1.0 g/mol, resulting in a molar mass of 30.0 g/mol for C₂H₆.

To find the number of moles, you divide the mass of the sample by the molar mass of the compound. Therefore, divide 10.0 g by 30.0 g/mol, which equals approximately 0.333 moles of C₂H₆.

The answer, 0.333 moles, has three significant figures because the provided mass (10.0 g) has three significant digits. This is in accordance with the rule that the result of a division or multiplication operation in chemistry should have the same number of significant figures as the operand with the least number of significant figures.

Answer:

Combination or synthesis

Explanation:

In combination or synthesis, there is formation of a single product from two or more reactants e.g:

               H₂ + I₂ → 2HI

Here a compound forms from the association of the consituent elements.

Other kinds of chemical reactions we have are:

Answer:

False

Explanation:

It is coal-fired power plants that produce mercury, air pollution, and carbon dioxide.  

However, nuclear energy produces radioactive waste that must be stored for many years before it can be safely disposed.

your answer is C. considered a mixed success.

Answer:

Option (1), (2) and (5)

Explanation:

Topographic maps are those that illustrate the surface features of different areas. It provides detailed information about an area such as the relief, hills, basins, rivers, and mountains and is constructed in both small and large scale. These maps are often used by geographers and geologists to study about any particular area.

In the given question, these topographic maps are used for recreation purposes including camping, hiking that enables them to lead the path. It is also used by the engineering geologist and engineers for the construction of roads and railways, buildings and houses, as the more resistant and reliable surfaces are traced out and used for these purposes. And mostly used by the geologists in order to understand how these surface features like folds, faults, mountains, and valleys have formed and evolved with the increasing time.

Hence the correct answers are option (1), (2) and (5)

Answer:

1,2 and 5

Explanation:

You have to check each statement, so this is equivalent to 5 different questions.

Answers:

The true statements are:

Explanations:

a. Li has valence electrons in the n = 1 energy level.

Valence electrons are the electrons in the outermost main energy level (shell of electrons).

To determine where the valence electrons are, you build the electron configuration, using Aufbau rules to predict the orbital filling: in increasing order of energy.

The atomic number of lithium (Li) is 3. Hence, you have to distribute 3 electrons, and so its electron confiuration is:

The only valence electron is in the 2s orbital, i.e. in the n = 2 energy level.

b. Si has valence electrons in the n = 3 energy level.

Silicon (Si) has atomic number 14, so you have to distribute 14 electrons in increasing order of energy:

Thus, Si has five valence electrons, and they are in the n = 3 energy level.

c. Ga has valence electrons in the n = 3 energy level.

Gallium has atomic number 31, so you have to distribute 31 electrons, filling the orbitals in increasing order of enery.

The highest energy level is 4. This is where the valence electrons are. So, Ga has the valence electrons in the n = 4 level (not n = 3 as the statement describes).

d. Xe has valence electrons in the n = 5 energy level.

The atomic number of Xe is 54.

Using the short notation (noble gas notation), and filling the orbitals in increasing order of energy, you get the configuration:

Hence, the valence electrons are in the n ) 5 level, such as the statement describes.

e. P has valence electrons in the n = 2 energy level.

Phosphorus (P) has atomic number 15, hence there are 15 electrons.

The electron configuration following the increasing order of energy, which you can remember using Aufbau rules, is:

Then, the valence electrons are in the n = 3 energy level; not in the n = 2 energy level.

Answer:

Explanation:

The pH scale is a logarithmic scale that runs from 1 to 14.

1 is the lower limit of the scale and 14 is the upper limit of the scale. On a pH scale, to represent a decrease of one unit, the concentration of the hydrogen ion or the hydroxyl ion must change.

A decrease in 1 unit or 1 pH represents a concentration of 10moldm⁻³.

                    Note: pH= -log₁₀[H⁺]

Answer:

Each time you exhale, you are releasing carbon dioxide into the atmosphere. Animals and plants get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned.

Answer:

Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.

Explanation:

Carbon moves from living things to the atmosphere. Each time you exhale, you are releasing carbon dioxide gas (CO2) into the atmosphere. Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned.

Answer: 100x

Explanation:

The actual power or magnification of a compound optical microscope is the product of the powers of the ocular (eyepiece) and the objective lens. The maximum normal magnifications of the ocular and objective are 10× and 100× respectively, giving a final magnification of 1,000×.

The chemical reaction described by the question:

[tex]Mg(OH)_{2} + 2HCl = MgCl_{2} + 2H_{2}O[/tex]

Then for finding the number of moles of magnesium hydroxide Mg(OH)[tex]_{2}[/tex]

number of moles = mass (grams) / molecular mass (g/mole)

number of moles of Mg(OH)[tex]_{2}[/tex] = 355 / 58 = 6.12  

From the chemical reaction:

1 mole of Mg(OH)[tex]_{2}[/tex] reacts with 2 moles of HCl

6.12 moles of Mg(OH)[tex]_{2}[/tex] reacts with x moles of HCl

x = (6.12×2)/1 = 12.24 moles of HCl

And now we can determine the mass of hydrochloric acid HCl

mass (grams) = number of moles x molecular mass (grams/mole)

mass of HCl = 12.24 × 36.5 = 446.76 g

Final answer:

To determine the mass of hydrochloric acid needed to react with 355g of magnesium hydroxide, we use stoichiometry based on their molar masses to calculate that 444.09 grams of hydrochloric acid are required.

Explanation:

The student is asking how many grams of hydrochloric acid (HCl) are needed to fully react with 355g of magnesium hydroxide (Mg(OH)2). To solve this, we'll use the reaction equation:

Mg(OH)2 + 2HCl → MgCl2 + 2H2O

First, we need to find the molar mass of Mg(OH)2 (24.305 + 2(15.999) + 2(1.008) = 58.319 g/mol) and HCl (1.008 + 35.45 = 36.458 g/mol).

Next, we calculate the moles of Mg(OH)2 used using its molar mass:

355g Mg(OH)2 × (1 mol/58.319 g) = 6.09 mol Mg(OH)2

According to the balanced equation, 1 mole of Mg(OH)2 reacts with 2 moles of HCl. Thus:

 6.09 mol Mg(OH)2 × (2 mol HCl/1 mol Mg(OH)2) = 12.18 mol HCl
Finally, we find the mass of HCl needed:

 12.18 mol HCl × (36.458 g/mol) = 444.09 g HCl
Therefore, 444.09 grams of hydrochloric acid are needed to fully react with 355g of magnesium hydroxide.

Answer:

Explanation:

The term organic matter refers to the matter in the living organisms. Nowadays, organic compounds, the object of organic chemistry, are the compounds that contain carbon except carbon oxides, carbides and carbonates (which are considered inorganic compounds).

Organic compounds form a vast  variety of vital compounds based on the versatility of carbon atoms.

Carbon atoms have four valence electrons which can form a variety of single, double, and triple bonds with it self, to form long chains.

Carbon atoms can also form bonds with other elements like, hydrogen, oxygen, nitrogen, halogens, among others, to form different kind of compounds: alkanes, alkenes, alkynes, alcohols, aldehydes, esters, eters, amines, amides, polymers, among others.

Thus, organic compounds form a vast subject of study based on the  special chemical properties of carbon.

Answer:

Explanation:

Air is a mixture of gases (mainly oxygen and nitrogen, but also carbon dioxide, water vapor, and others in minimum amount).

The pressure of the gases is the product of the collisions of the air molecules with the surface of the objects. Since the molecules of gases are in constant, rapid random motion, they are constantly (you may say continously) colliding with the surfaces of the objects in all directions. That explain, why the air exertes pressure in all directions.

There are many experiments that you can perform to show this phenomenum.

You can perform this experiment, for example:

What will you observe?

Why does that happen?

Since the pressure is exerted in all the directions, the bottle or can collapse.

Answer: The enthalpy change of the reaction is -1322.91 kJ

Explanation:

The chemical equation for the combustion of propane follows:

[tex]C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(g)[/tex]

The equation for the enthalpy change of the above reaction is:

[tex]\Delta H^o_{rxn}=[(2\times \Delta H^o_f_{(CO_2(g))})+(2\times \Delta H^o_f_{(H_2O(g))})]-[(1\times \Delta H^o_f_{(C_2H_4(g))})+(3\times \Delta H^o_f_{(O_2(g))})][/tex]

We are given:

[tex]\Delta H^o_f_{(H_2O(g))}=-241.818kJ/mol\\\Delta H^o_f_{(O_2(g))}=0kJ/mol\\\Delta H^o_f_{(CO_2(g))}=-393.509kJ/mol\\\Delta H^o_f_{(C_2H_4(g))}=52.26kJ/mol[/tex]  

Putting values in above equation, we get:

[tex]\Delta H^o_{rxn}=[(2\times (-393.509))+(2\times (-241.818))]-[(1\times (52.26))+(3\times (0))]\\\\\Delta H^o_{rxn}=-1322.91kJ[/tex]

Hence, the enthalpy change of the reaction is -1322.91 kJ