Methane (CH4) is a common fuel to heat homes in the winter. What is the molar enthalpy of combustion of methane? Assume this combustion occurs entirely in the gas phase. Bond Enthalpies(in kJ molâ1):CâC: 347 CâH: 413 HâH:432 OâH: 467 C=C: 614C=O: 745O=O: 498


A)â710kJ molâ1


B)â297 kJmolâ1


C)â1843 kJmolâ


1D)+792 kJmolâ1


E)+567 kJmol

The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

Learn more about Metric units, here:
https://brainly.com/question/19483018

#SPJ1

The volume of the container that the gas is in is approximately 45.74 liters.

To determine the volume of the gas, we can use the Ideal gas law:

PV = nRT

Where:

P = Pressure

V = Volume

n = Number of moles of gas

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature in Kelvin

We have the following values:

P = 4.7 atm

n = 7.7 moles

R = 0.0821 L·atm/(mol·K)

T = 329 K

Now we can rearrange the Ideal gas law equation to solve for V:

V = (nRT) / P

Substituting the given values into the equation:

V = (7.7 moles × 0.0821 L·atm/(mol·K) × 329 K) / 4.7 atm

V ≈ 45.74 L

Therefore, the volume of the container that the gas is in is approximately 45.74 liters.

Learn more about Volume from the link given below.

https://brainly.com/question/28058531

#SPJ4

Answer:

(It doesn't need to be m/s, but it's the most common unit. It's basically any unit of length divided by any unit of time)

hope this helps and good luck

Answer/Explanation:

Speed is a force and is solved by using acceleration.

You can use the problem to solve for force:

F= MA or Force equals mass times acceleration.

False. Pressure has a direct impact on the solubility of liquids and solids. Increasing pressure raises the solubility of a given substance, while decreasing pressure reduces it. This is because higher pressure forces molecules closer together, making it easier for them to dissolve in a solvent.

The effect of pressure on the solubility of liquids and solids is an important factor to consider in many industrial processes. When the pressure is increased, the solubility of a given substance increases as well, due to the increased force between molecules which makes it easier for them to dissolve in a solvent.

Learn more Solute and solvent: https://brainly.com/question/25326161

#SPJ4

The source of hydrogen during the loss of the leaving group to form the free amine is water donates two protons during this phase of the reaction, option C.

Solar energy, or electromagnetic radiation, is produced in large quantities by the sun. Only a small portion of this energy, known as "visible light," is visible to humans. Waves may be used to explain and quantify how solar energy moves. The distance between two successive, comparable locations in a succession of waves, such as from crest to crest or trough to trough, is known as the wavelength and allows scientists to calculate the energy of a wave.

A certain range of wavelengths characterises each form of electromagnetic radiation. Less energy is carried when the wavelength is longer (or looks to be stretched out). The most energy is carried by short, tight waves. It might seem illogical at first, but picture a moving rope to help you understand. A person can move a rope in long, broad waves with little effort. One would have to use much more force to make a rope move in short, tight waves.

Learn more about Hydrogen:

https://brainly.com/question/30722024

#SPJ4

The formula for the relationship between weight and blood pressure in children is:

We differentiate the above function with respect to x Therefore:

Rate of change at the 70-pound weight level:

Blood is a fluid found in all living things that functions to deliver substances and oxygen needed by body tissues, transports chemical products of metabolism, and also acts as the body's defense against viruses or bacteria. Blood has the function of regulating acid and base balance. ,transports O2, carbohydrates, and metabolites, regulates body temperature by conduction or conduction, carries body heat from heat production centers (liver and muscles).

Learn More About Blood at https://brainly.com/question/920424

#SPJ11

a. Consistency is a term that matches the description: The agreement between several measurements of the same quantity.

b. Density matches the description: Ratio between the mass and volume of a substance.

c. Outlier matches the description: In a series of measurements of the same quantity, one that is significantly different from the others.

d. Mean matches the description: Mathematical value reported when a quantity is measured multiple times.e. Immiscible is a term describing two liquids that do not mix together.

Definition: Immiscibility is the property of not being miscible. When two or more liquids are not able to form a homogeneous solution when combined, they are immiscible. The term "miscible" refers to the property of being mixed. Therefore, immiscible liquids cannot be mixed together or dissolved in one another.

Limiting reagent (also known as limiting reactant) is a chemical reaction term that refers to the substance that limits the quantity of product that can be formed in a chemical reaction. It is the substance that is entirely consumed first, preventing the other reactants from reacting further. The amount of product generated is determined by the quantity of the limiting reagent. In a chemical reaction, the quantity of the product produced is determined by the limiting reactant, and the rest of the excess reagents will remain unchanged.

To learn what is limiting reagent : https://brainly.com/question/26905271

#SPJ11

The solubility of MgF₂ in a 0.020 M NaF solution will be approximately 0.32 g/L.

To determine the solubility of magnesium fluoride (MgF₂) in a sodium fluoride (NaF) solution, we can utilize the common ion effect.

The solubility of a salt will be typically reduced when a common ion is present in the solution. In this case, the common ion is fluoride (F⁻) from both MgF₂ and NaF.

Given;

Solubility of MgF₂ in water = 0.016 g/L

To find the solubility of MgF₂ in 0.020 M NaF, we need to consider the equilibrium that occurs between the dissolution of MgF₂ and the precipitation of MgF₂:

MgF₂(s) ⇌ Mg²⁺(aq) + 2F⁻(aq)

The solubility of MgF₂ can be expressed as the concentration of Mg²⁺ ions in the solution since each mole of MgF₂ dissociates into one mole of Mg²⁺ ions.

Using the balanced equation, we see that the concentration of F- ions in the solution will be twice the concentration of Mg²⁺ ions: [F⁻] = 2[Mg²⁺].

Now, we can set up an expression to calculate the solubility of MgF₂ in the presence of NaF:

Ksp = [Mg²⁺][F⁻]²

Since [F⁻] = 2[Mg²⁺], we can substitute it into the Ksp expression;

Ksp = Mg²⁺²

0.016 = 4[Mg²⁺]³

Rearranging the equation:

[Mg²⁺] = (0.016/4\()^{(1/3)}\)

[Mg²⁺] ≈ 0.32 g/L

Therefore, the solubility is approximately 0.32 g/L.

To know more about solubility here

https://brainly.com/question/30827532

#SPJ4

Answer:

The concentration of the solution is 5.8168 × \(10^{-4}\) mol.\(dm^{-3}\)

Explanation:

Here, we want to calculate the concentration of the solution.

The unit of this is mol/dm^3

So the first thing to do here is to calculate the number of moles of the solute present, which is the number of moles of AlCO3

The number of moles = mass/molar mass

molar mass of AlCO3 = 27 + 12 + 3(16)  = 27 + 12 + 48 = 87g/mol

Number of moles = 33.4/87 = 0.384 moles

This 0.384 moles is present in 660 L

x moles will be present in 1 dm^3

Recall 1 dm^3 = 1L

x * 660 = 0.384 * 1

x = 0.384/660 = 0.00058168 = 5.8168 * 10^-4 mol/dm^3

Helium fusion requires higher temperatures than hydrogen fusion because of the increased electrostatic repulsion between helium nuclei.

Helium has two protons, while hydrogen only has one, the strong nuclear force, which binds the atomic nuclei together, is powerful but short-ranged. To overcome the electrostatic repulsion and allow the strong nuclear force to act, helium nuclei must come very close to each other.  At higher temperatures, the particles have greater kinetic energy, which increases the chances of helium nuclei colliding with enough force to overcome the repulsion.

The temperature required for helium fusion, known as the triple-alpha process, is around 100 million Kelvin, significantly higher than the 15 million Kelvin needed for hydrogen fusion through the proton-proton chain reaction. In summary, the increased electrostatic repulsion between helium nuclei and the need for a closer approach for the strong nuclear force to take effect result in helium fusion requiring higher temperatures than hydrogen fusion.

Learn more about hydrogen fusion at

https://brainly.com/question/3501435

#SPJ11

Answer:

D.

Explanation:

To convert from grams of a substance to moles of a substance, you use molar mass as a conversion factor. Sodium's molar mass is 22.99 grams per mole. To cancel out grams, you need to place grams on the bottom and moles on the top.

Given:

Capacity of an automobile's tank = 64 liters.

To find:

The method which is correct for determining the number of gallons.

Solution:

We know that,

1 L = 1.057 quarts

1 gallon = 4 quarts.

Using these conversions, we get

Conversion factor liter to quart: \(\dfrac{1.057 quarts}{1.000 liter}\)

Conversion factor quart to gallon:  \(\dfrac{1 gallon}{4 quarts}\)

Required method is

\(\text{Number of gallons}=64 liters \left(\dfrac{1.057 quarts}{1.000 liter}\right) \times \left(\dfrac{1 gallon}{4 quarts}\right)\)

Therefore, the correct option is d.

The study of a living being is called biology.

The correct answer D

The data is given in the question as follows:-

The formula is used to solve this question is as follows:-

\(\frac{1.057}{1.000} *\frac{1}{4}\\\\\)

After solving the equation, the correct answer is D.

For more information, refer to the link:-

https://brainly.com/question/25305623

The mass of chalk in this case is 3.90g.

According to the law of conservation of mass, mass can neither be created nor destroyed hence the mass before reaction is equal to the mass after reaction.

Any loss in mass will therefore reflect the mass of chalk used. Therefore, the mass of chalk used in this case is 3.90g.

Learn more about law of conservation of mass: https://brainly.com/question/13383562

Bethanechol mimics the neurotransmitter acetylcholine.

Bethanechol is a medication used to stimulate motility and increase secretions in patients with decreased vagal nerve function, such as after surgery. It is a synthetic cholinergic agonist that acts by mimicking the effects of acetylcholine, the neurotransmitter released by the vagal nerve.

Acetylcholine is an important neurotransmitter in the parasympathetic nervous system, which is responsible for regulating various bodily functions, including digestion and smooth muscle contraction. It acts on specific receptors called cholinergic receptors, activating them and triggering the desired physiological responses.

By mimicking acetylcholine, bethanechol can bind to and activate cholinergic receptors, particularly muscarinic receptors located in various tissues and organs. This activation leads to increased smooth muscle contractions, including those involved in gastrointestinal motility, and enhanced secretion of fluids and mucus in the digestive and respiratory systems.

Overall, bethanechol's ability to mimic acetylcholine allows it to compensate for decreased vagal nerve function and stimulate the parasympathetic responses needed for improved motility and secretion in post-surgical patients or individuals with impaired vagal nerve activity.

To learn more about acetylcholine, here

https://brainly.com/question/29855206

#SPJ4

Answer:

A,C,E,F

Explanation:

Lewis structure of CN - has a triple bond between the carbon and nitrogen atoms and one lone pair on each of the carbon and nitrogen atoms.

Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that depict the interactions of atoms inside molecules as well as any lone pairs of electrons that may be present. Every molecule with a covalent link, as well as coordination compounds, can have a Lewis structure. Gilbert N. Lewis, who first described it in his 1916 article The Atom and the Molecule, gave the Lewis structure its name.

To learn more about Lewis structure visit;

https://brainly.com/question/4144781

#SPJ4

Selecting resources with reliable credentials and expertise is important for any information you look up on any topic.

There are several factors to consider when selecting resources:

Credentials: The credentials of the author or organization providing the information are important to consider. Look for information from reputable sources such as academic institutions, government agencies, and well-established organizations.

Expertise: The expertise of the author or organization is also important. Look for information from experts in the field who have relevant education and experience.

Date: The date of the information is also important. Look for the most recent information on a topic as older information may be outdated or inaccurate.

Reliability: The reliability of the source should also be considered, look for sources that are peer-reviewed, or have been validated by reputable organization

Bias: Consider the potential bias of the source and how it might affect the information presented.

Purpose: The purpose of the source should also be considered, whether it is for academic, commercial or personal use.

Accessibility: The resource should be available easily, whether is free to access or paid, and it should be in the appropriate format and language.

To know more about education, visit:

https://brainly.com/question/1602018

#SPJ1

Chemicals released by a neuron onto a target with an excitatory or inhibitory effect are called neurotransmitters. Therefore, the correct answer is option C: neurotransmitters.

Neurotransmitters are chemical messengers that transmit signals between neurons and their target cells, which can be other neurons, muscle cells, or gland cells. They are synthesized and stored within the neuron's synaptic vesicles. When an action potential reaches the presynaptic neuron's terminal, it triggers the release of neurotransmitters into the synapse, the small gap between the presynaptic neuron and the postsynaptic target cell.

Neurotransmitters can have excitatory or inhibitory effects on the postsynaptic cell. Excitatory neurotransmitters promote the generation of an action potential in the postsynaptic cell, while inhibitory neurotransmitters decrease the likelihood of an action potential being generated. This excitatory or inhibitory effect is determined by the specific receptors on the postsynaptic cell that bind to the neurotransmitters.

Examples of neurotransmitters include acetylcholine, dopamine, serotonin, gamma-aminobutyric acid (GABA), and glutamate. They play crucial roles in regulating various physiological and cognitive processes, including mood, memory, muscle contraction, and pain sensation.

Know more about Neurons here:

https://brainly.com/question/10706320

#SPJ11

The pH of a 0.0000001 Molar HCl solution is 7.

Since HCl is a strong acid, it dissociates completely in water to form H+ and Cl- ions.

The concentration of H+ ions in the solution will be equal to the concentration of the HCl, which is 0.0000001 Molar.

Using the pH scale, we can calculate the pH of this solution as follows:pH = -log [H+]pH = -log 0.0000001pH = 7

The pH of the solution is 7, which is neutral.

The pH of a 0.0450 Molar Ba(OH)2 solution is 12.

Since Ba(OH)2 is a strong base, it dissociates completely in water to form Ba2+ and OH- ions.

The concentration of OH- ions in the solution will be twice the concentration of Ba(OH)2, which is 0.0450 Molar.

Using the pH scale, we can calculate the pH of this solution as follows:pOH = -log [OH-]pOH = -log (2 x 0.0450)pOH = 1.34pH + pOH = 14pH = 14 - 1.34pH = 12.66

The pH of the solution is 12.66, which is basic.

For more question on molar

https://brainly.com/question/29424807

#SPJ8

Answer:

90 grams. Input mass = output mass

Explanation:

Answer:

D. ammonia, because the other three are the only three strong bases in the world (we do not need to memorize base dissociation constant for the test, we just need to know the three strong bases)

Explanation:

q u i z l e t

A 25.00 ml sample of an unknown diprotic weak acid is titrated to the equivalence point with 17.48 ml of 0.09475 m NaOH. The concentration of the unknown diprotic weak acid is 0.0424 M.

To calculate this, we use the equation:
Molarity (M) = moles (n) / liters (V).
The moles of NaOH can be determined from the volume (V) and molarity (M) of NaOH using the equation:

n = M x V.

The moles of NaOH is then equal to

(0.09475 M x 0.01748 L) = 0.001662 moles.
Since the acid is diprotic, the equivalence point is when there is equal moles of acid to the moles of base.

Therefore, the moles of acid is equal to 0.001662 moles.
Using the same equation as above, we can determine the molarity of the acid as:

M = n/V = 0.001662 moles/0.025 L = 0.0424 M.
This calculation is consistent with the definition of a weak acid, which is one that dissociates only partially in solution. Therefore, the molarity of the unknown weak acid is 0.0424 M.
In conclusion, a 25.00 ml sample of an unknown diprotic weak acid was titrated to the equivalence point with 17.48 ml of 0.09475 m NaOH, and the concentration of the unknown weak acid was determined to be 0.0424 M.

For more such questions on molarity , Visit:

https://brainly.com/question/17138838

#SPJ11

To assign each species to a category on the right, we need to understand the properties of each term.

- Strong acids are defined as substances that completely dissociate in water to form H+ ions. Examples of strong acids include HCl, HNO3, and H2SO4.
- Weak acids are defined as substances that only partially dissociate in water to form H+ ions. Examples of weak acids include CH3COOH and H2CO3.
- Strong bases are defined as substances that completely dissociate in water to form OH- ions. Examples of strong bases include NaOH and KOH.
- Weak bases are defined as substances that only partially dissociate in water to form OH- ions. Examples of weak bases include NH3 and C5H11N.

With these definitions in mind, we can now assign each species to a category on the right:

- NaOH: This is a strong base because it completely dissociates in water to form Na+ and OH- ions.
- CH3COOH: This is a weak acid because it only partially dissociates in water to form H+ and CH3COO- ions.
- HI: This is a strong acid because it completely dissociates in water to form H+ and I- ions.
- C5H11N: This is a weak base because it only partially dissociates in water to form OH- ions.
- Clear: This term is not a chemical species and cannot be assigned to any category.

Note: It's important to understand the definitions and properties of each term in order to correctly assign species to their respective categories.

Learn more about dissociate here:

brainly.com/question/30983331

#SPJ11

Infrared light can be used to measure molecular polarity. Therefore, the correct option is option D.

A molecule or its chemical groups have an electric dipole moment with a negatively charged end and a positively charged end when they are polar, which in chemistry is the separation of electric charge. Because the bonded atoms' electronegativity differs, polar compounds must have one or more polar bonds. If the bond dipoles cancel one other out via symmetry, molecules with polar bonds are not polar. Infrared light can be used to measure molecular polarity. Dipole-dipole intermolecular forces and hydrogen bonding are how polar molecules communicate with one another. Many physical characteristics, including as surface tension, solubility, and melting and boiling points, are based on polarity.

Therefore, the correct option is option D.

To know more about molecular polarity, here:

https://brainly.com/question/30640129

#SPJ12

Answer:

M2 = 0.95M

Explanation:

M1V1 = M2V2

(1.9)(0.5) = M2(1)

M2 = 0.95M

Asking a scientific question is the step in the process of scientific inquiry that has already been completed (Option A).

Asking a scientific question is a fundamental issue when using the scientific method to test the hypothesis. This step refers to the emergence of a given problem by observing the features of some process in the real world

Therefore, with this data, we can see that asking a scientific question is key to obtaining data by using the scientific method.

Complete question:

A research student wants to know whether ethanol is a better fuel than gasoline.

Which step in the process of scientific inquiry has already been completed?

Asking a scientific question

Performing an investigation

Collecting data

Providing explanations

Learn more about asking scientific questions here:

https://brainly.com/question/823279

#SPJ1

Answer:

Anita did not make the track team this year, and she feels really disappointed and upset. What question would most likely redirect her thinking and provide a solution?

Why did this terrible thing happen to me?

What other sports can I try this spring?

Why does everything I attempt go wrong?

Why did Karen get on the team but I didn't?

Answer - What other sports can I try this spring?

Explanation:

Failures and successes are part of our daily lives as humans. It can be very challenging for one to accept his or her failures and bring oneself above it.

when failure occur, the best way to reverse the negative impacts it brings is to move forward and decide on what next to do.  

The actions that must be taken in the processes should be quite productive enough to bring back the results one desired.

When the effects of failures prove irreversible, one would then give the mind a diversion and help his or herself think their way though the failure that was encountered.