when ethane burns in air to form carbon dioxide and water ,heat energy is released. Explain why energy is released​

Answer:

High explosives do not need to be contained to make their bang. Nitroglycerine, trinitrotoluene, and RDX are high explosives.

Explanation:

The balanced equation for the reaction between sodium fluoride and bromine gas is _NaF + _Br2 → _NaBr + _F2 Balancing chemical equations.

The following procedure is commonly used to balance chemical equations:

Step 1: Begin by writing the unbalanced equation.

Count the number of atoms of each type on both the reactant and product sides.

Step 2: Choose an element to balance first.

Usually, the element that appears in only one reactant and one product is selected.

Oxygen is frequently selected because it is present in almost all compounds.

For polyatomic ions, balance the elements contained within the ion as a single unit.

Step 3: Balance the element you chose in step 2 by adding the correct coefficient to the appropriate compound.

Make sure that you do not alter the chemical formula of the compound.

Step 4: Repeat the previous steps until all elements in the equation are balanced.

The correct coefficients when the equation is balanced are:

1 NaF + 1 Br2 → 1 NaBr + 1 F2

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If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.

Gold has the chemical symbol Au (from Latin: aurum) as well as the atomic number 79. As a result, it is one among the highest atomic number elements found in nature.

Some gold used for jewelry is called '18-karat white gold. This alloy is 75% gold (Au), 12.5% silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.

Therefore, if you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.

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If Aldebaran were to explode tonight, it implies that we would see the explosion in 65 years.

In astronomy, a light-year is a system of measurement that shows the unit of length equivalent to the distance that light travels in one year in a vacuum or approximately 5.88 trillion miles. The distance traveled by light in one year is measured in light-years.

However, if the star Aldebaran is the eye of the bull to the constellation Taurus(the bull) and it is about 65 light-years away,  it implies that we would see the explosion in 65 years.

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Answer:

1Al₄C₃ + 12H₂O → 3CH₄ + 4Al(OH)₃

Explanation:

SOLUTION :-

Balance it by using 'hit & trial' method , and you'll get the answer :-

1Al₄C₃ + 12H₂O → 3CH₄ + 4Al(OH)₃

VERIFICATION :-

In reactant side of equation :-

In product side of equation :-

Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.

Freeze-Thaw Weathering

This action can widen the cracks in the rock, and when the temperature rises above freezing, the ice thaws, allowing the water to seep further into the cracks. As this process of freezing and thawing happens repeatedly, the rock begins to weaken and eventually breaks apart into angular fragments.

Answer:

Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart. The process is sometimes assisted by water. ... Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.

Explanation:

hope this helps

No, noninvasive can not be used to study the responses of single neuron.

It is not possible to study the responses of a single neuron non-invasively using current technology. The information related to the activity of a single neuron can be studied using invasive methods such as microelectrode recordings from a single neuron. It is crucial to be cautious while performing such methods as it might damage the brain tissue.

Some non-invasive techniques like fMRI, EEG, and MEG can only record neural activity from many neurons together. EEG, fMRI, and MEG provide information on the activity of groups of neurons, but they cannot provide information on single neuron activity. Hence, invasive techniques are preferred as they can provide detailed information about the activity of individual neurons.

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The chemical equation for the given word equation is Ca(OH)\(_2\)(S) + 2HCI(I) → CaCl\(_2\)(aq) + 2H\(_2\)0(1).   Therefore, the correct option is option D.

Chemical equations are symbols or chemical formulas that depict a chemical reaction symbolically. With a plus sign separating the entities in the reactants and products, the reactant objects are listed on the left as well as the result entities are listed on the right.

An arrow indicating the reaction's direction points in the path of the products. The chemical formulas could be mixed, symbolic, or structural. The critical values of a stoichiometric figures are shown as coefficients beside the symbols as well as formulas of the various entities. The chemical equation for the given word equation is Ca(OH)\(_2\)(S) + 2HCI(I) → CaCl\(_2\)(aq) + 2H\(_2\)0(1).  

Therefore, the correct option is option D.

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Answer:

Qué es Crecimiento poblacional:

El crecimiento poblacional se refiere al incremento del número de habitantes en un espacio y tiempo determinado, el cual se puede medir a través de una fórmula aritmética. También se puede emplear como sinónimo el término crecimiento demográfico.

Cuando se hace mención al crecimiento poblacional se puede hacer referencia a cualquier especie animal, sin embargo, se suele usar para referirse a los seres humanos, en especial cuando se realizan investigaciones acerca del crecimiento de la población.

Los datos que se obtienen de estos análisis son de gran importancia, tanto para los gobiernos de un país como, para las diferentes organizaciones internacionales.

Cabe resaltar que durante el siglo XX la población de seres humanos ha crecido y sigue creciendo en gran porcentaje, lo que ha generado preocupación, en especial por sus consecuencias sobre el uso y cuidado de los recursos naturales, entre otros.

Las zonas urbanas son las que presentan mayor crecimiento demográfico, así como, los países en vías de desarrollo. Por el contrario, el crecimiento poblacional es menor en los países desarrollados.

Por ejemplo, el crecimiento poblacional en México ha ido en aumento a lo largo de su historia, es el país con más habitantes hispanohablantes en América Latina. México tiene una población aproximada a 130 millones de habitantes, y se estima que seguirá creciendo gracias a diversos factores gracias a su continuo desarrollo político, económico y social.

Answer:

*carboxylic acid

*other groups containing oxygen and nitrogen

* Alkenes and Alkynes

Explanation:

substances containing double ot tripple bonds are called Alkenynes

The pH of the resulting mixture is approximately 4.73. Option C is correct.

Lactic acid is a weak acid and will react with NaOH to form a salt, sodium lactate, and water.

The balanced equation for the reaction is;

C₃H₆O₃ + NaOH → C₃H₅O₃Na + H₂O

The initial concentrations of lactic acid and NaOH are;

[HA] = 0.2 M x 0.055 L = 0.011 mol

[OH⁻] = 0.1 M x 0.1 L = 0.01 mol

Since NaOH is strong base, it will completely dissociate in water to produce OH⁻ ions.

The reaction between lactic acid and NaOH can be treated as a buffer solution. The pH of the buffer solution can be calculated using Henderson-Hasselbalch equation;

pH = pKa + log([A⁻]/[HA])

where pKa is dissociation constant of the weak acid, [A⁻] is concentration of the conjugate base, and [HA] is concentration of the weak acid.

In this case, the conjugate base is sodium lactate (C₃H₅O₃Na) and the weak acid is lactic acid (C₃H₆O₃). The concentration of the conjugate base can be calculated from the amount of NaOH that reacts with lactic acid;

[Na⁺]= [OH⁻] = 0.01 mol

[A⁻] = 0.01 mol/0.055 L = 0.182 M

Therefore,

pH = pKa + log([A⁻]/[HA])

pH = 3.86 + log(0.182/0.011)

pH = 4.73

Therefore, the pH is 4.73.

Hence, C. is the correct option.

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a. Ne: weak London dispersion forces.
b. CO: dipole-dipole interactions.
c. CH3OH: hydrogen bonding and dipole-dipole interactions.
d. Cl2: weak London dispersion forces.

The intermolecular forces in the liquid state of various substances.
a. Ne (Neon) - The intermolecular force active in the liquid state of neon is London dispersion forces, which are the weakest type of intermolecular forces.
b. CO (Carbon monoxide) - The intermolecular force present in the liquid state of carbon monoxide is dipole-dipole interaction, as CO is a polar molecule.
c. CH3OH (Methanol) - In the liquid state of methanol, the primary intermolecular force is hydrogen bonding, due to the presence of a polar O-H bond.
d. Cl2 (Chlorine) - The intermolecular force active in the liquid state of chlorine is London dispersion forces, as Cl2 is a nonpolar molecule.

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Since Q < Ksp (4.0x10-5), PbF2 will not precipitate out of solution. The solution will contain Pb2+, F-, NH4+, and NO3- ions in equilibrium.

When lead nitrate (Pb(NO3)2) and ammonium fluoride (NH4F) are mixed, they will react to form lead fluoride (PbF2) and ammonium nitrate (NH4NO3) according to the following balanced chemical equation:

Pb(NO3)2 + 2 NH4F → PbF2 + 2 NH4NO3

To determine whether or not PbF2 will precipitate out of solution, we need to calculate the ion product (Q) and compare it to the solubility product constant (Ksp) for PbF2. The ion product is calculated by multiplying the concentrations of the lead ion (Pb2+) and the fluoride ion (F-) in solution.

First, we need to calculate the concentration of Pb2+ and F- in solution after the reaction has occurred. Since the initial concentrations of Pb(NO3)2 and NH4F are both 2.0x10-4 M, the total volume of the solution is 100.00 mL. Therefore, the concentration of Pb2+ and F- after the reaction will be:

[Pb2+] = (50.00 mL / 100.00 mL) × 2.0x10-4 M = 1.0x10-4 M

[F-] = (50.00 mL / 100.00 mL) × 2.0x10-4 M = 1.0x10-4 M

Now we can calculate the ion product:

Q = [Pb2+][F-] = (1.0x10-4 M)(1.0x10-4 M) = 1.0x10-8

Since Q < Ksp (4.0x10-5), PbF2 will not precipitate out of solution. The solution will contain Pb2+, F-, NH4+, and NO3- ions in equilibrium.

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Answer:

YEESSS

Explanation:

Because that seems like the only logical answer.

Answer:

YES

Explanation:

YES

Answer:

There are 1.253*10²⁴ particles in 2.080 moles

Explanation:

Avogadro's number is called the number of particles that make up a substance (usually atoms or molecules) that can be found in the amount of one mole. In other words, Avogadro's number is the number of molecules that one mole of any substance contains.  Its value is 6.023 * 10²³ particles per mole.

So, you can apply a rule of three as follows: if 1 mole has 6.023*10²³ particles, then 2.080 moles, how many particles does it have?

\(amount of particles=\frac{2.080 moles*6.023*10^{23}particles }{1 mole}\)

amount of particles= 1.253*10²⁴ particles

There are 1.253*10²⁴ particles in 2.080 moles

The  emperical formula will be FeSO4.

It is formula of the compound which shows the simplest ratio of elements in compound rather than the total number of atoms present in the molecule.

.

We have given the percentage of the Oxygen  = 42.13%, Iron =36.76%  and Sulphur  =21.11% .

let us canculate the no. Of moles of each element

Fe = 36.76/ 56

= 0.65 moles of fe

 S = 21.11/ 32

= 0.65 moles of Sulphur

Oxygen = 46.13/16

= 2.88 moles of oxygen .

Now , we have to find the least no of moles and then divide that least number with every element moles .

0.65 is the least so , dividing it by Fe we get 1 , dividing itself get 1 and dividing it by oxygen we 4 .

We have to write the simplest number ,decimals doesn't matter  .

now ,the formula we get is FeSO4.

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Answer:

5.4

Explanation:

V1=5.0

T1=25+ 273=298

V2= z(unknown)

T2=5+273=278

V1/T1 =V2/T2

V2=V1T2/T1

=5*298/278

=5.4

It would be 2.515 yards. This is because to convert cm into yards, you would need to divide the length value by 91.44 so in your case, it would be 230÷ 91.44 which equals 2.51531.

Hope that helps!

Answer

b. It produces carbon dioxide when burned in pure oxygen.

Explanation

The reaction between diamond and oxygen, producing carbon dioxide is not a physical property of diamond, it is a chemical property because breaking and synthesis of chemical bonds occur.

We can see that the ion that has a noble gas electron configuration is:

C. \(C^{2-}\)

An ion is an atom or a group of atoms that carries an electric charge. It is formed when an atom gains or loses electrons, resulting in an imbalance between the number of protons (positively charged particles) and electrons (negatively charged particles) in the atom.

When an atom gains one or more electrons, it becomes negatively charged and forms a negative ion, also known as an anion. This occurs because the atom now has more electrons than protons. Anions are represented by a negative sign (-) after the atomic or molecular symbol.

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Answer:

Coal, Oil and Natural Gas.

Explanation:

Coal: It is the primary fuel for the production of electricity and is responsible for about 40% of the electric power supply in the United States. The burning of coal and the mining process is harmful to the environment releasing air pollutants such as sulfur dioxide, nitrogen oxide, and mercury.

2. Oil: Oil is the primary source for the world's transportation. Most oil is pumped out of underground reservoirs but may also be found in shale and tar sands.  

3. Natural Gas: About 27% of U.S. energy is fueled by natural gas. It is commonly used to produce heat or electricity for buildings and industrial processes.

Answer:

Part A) By seeing if your hands are clean and dont have germs

Part B) Dip your hands in mud and then wash your hands to see results

Explanation:

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass of object = 60 g

volume = 20 mL

The density of the object is

\(density = \frac{60}{20} = \frac{6}{2} = 3 \\ \)

We have the final answer as

Hope this helps you

Answer:

1. A

2. C

3. C

Explanation:

1. there are single cell organisms

2. all others are abiotic factors

3. individual is just one, population is one species, community is all populations, ecosystem includes abiotic and biotic factors, biome is a large geographical area.

Answer:

Phosphoric Acid is an acid-containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. It is also known as phosphoric(V) acid or orthophosphoric acid.

Explanation:

Answer:

Phosphoric Acid is an acid-containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. It is also known as phosphoric(V) acid or orthophosphoric acid.

Answer:

Explanation: the answer is YES

CO(NH2)2  and (NH2)2 CO is the urea

Explanation:

Molarity = Moles /Volume = 2.2/1.3 = 1.7 M