what percentage of oxygen is attributed fossil fuel combustion


A.43%


B.77%


C.4%


D.17%

To calculate the time it will take to plate out 1.86 g of chromium metal when a current of 15.0 A is applied to a solution of Cr3+ ions, we can use Faraday's Law of Electrolysis:

This law states that the amount of substance deposited at an electrode during electrolysis is directly proportional to the amount of electric charge that passes through the solution.

t = (1.86 g Cr) / (F * I * n * m)

Where F is Faraday's Constant (96485 C/mol), I is the current (15 A), n is the number of electrons exchanged (3) and m is the molar mass of chromium (52 g/mol).

Substituting the values in place we get

t = 1.86 g / 96485 * 15 * 3 * 52

[The units for a charge, electricity and gram get canceled out and we are left with the unit of time]

Thus giving us a result of t = 1.6 seconds.

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Answer:

D. Data that support a hypothosis

Explanation:

Evidence needs to support a claim

Answer:

data that support a hypothesis

Answer: true

Explanation: An atom does of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Protons and neutrons have nearly equal masses, but in a way they DO differ in charge.

The liquid substance used in the laboratory for dissolving dry mortar on floor flies is hydrochloric acid.

Hydrochloric acid is a strong acid that can dissolve many materials, including dry mortar.

Hydrochloric acid also known as muriatic acid or sulfuric acid, are commonly used to dissolve hardened mortar or concrete residues.

To use hydrochloric acid to dissolve dry mortar, you will need to mix the acid with water in a ratio of 1 part acd to 10 parts water.

You should then apply the mixture to the dry mortar using a brush or spray botle.

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The claim that cold water boils faster than hot water is not true. The reason why this misconception may have emerged is likely due to a misunderstanding or misinterpretation of certain observations. However, there is no scientific evidence supporting this claim.

One possible reason for this misconception is the notion that hot water takes longer to reach its boiling point because it starts at a higher temperature. When comparing hot and cold water in terms of reaching the boiling point from room temperature, the cold water may appear to boil faster.

However, this is simply because the hot water has already gained a head start in terms of temperature. In reality, once both liquids reach their respective boiling points, the hot water will boil first.

Scientifically, the boiling point of water is determined by its temperature and pressure. Under normal atmospheric conditions, the boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit). Heating water raises its temperature, and once it reaches 100 degrees Celsius, it transitions into the gaseous state. The initial temperature of the water does not affect the boiling point itself.

In conclusion, the claim that cold water boils faster than hot water is a misconception. It likely arose from a misinterpretation of observations, and there is no scientific evidence to support this claim. The boiling point of water is solely determined by its temperature and pressure, regardless of whether the water is initially hot or cold.

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electricity can flow well through magnetic poles

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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When cyclohexene is mixed with a sulfonitric mixture (H2SO4/HNO3), it reacts to form nitrocyclohexane and sulfur dioxide.

This reaction proceeds in two steps. Firstly, cyclohexene undergoes electrophilic addition with the nitronium ion (NO2+), which is generated from the reaction between HNO3 and H2SO4. This results in the formation of nitrocyclohexane, giving the initial pale yellow color to the solution.

In the second step, nitrocyclohexane reacts with the excess sulfuric acid present in the mixture. This step is highly exothermic, releasing a significant amount of energy. The sudden release of energy causes an explosion. The exact mechanism of the explosive reaction is complex, involving the generation of reactive intermediates. It is believed that the reaction proceeds via a radical mechanism, where nitrocyclohexane decomposes into highly reactive nitrogen and carbon-centered radicals. These radicals further react with sulfur dioxide, which is produced in the reaction, to form stable compounds. As a result, the solution turns dark brown after the explosion.

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The number of particles of gold that are in 2.3 moles of Au is 1.38 * 10²⁴ particles.

The number of moles of O₂ in 15.5 grams of O₂ is 0.48 moles

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide is 0.254 grams

The number of atoms of titanium in 23.4 Kg Ti is 2.93 * 10²⁶ atoms

The mass in grams of O₂ needed to produce 75.0 grams of H₂O is 66.67 grams of O₂

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ is 9.375 g.

The number of particles in a mole of a substance is 6.02 * 10²³.

Considering the given questions:

The number of particles of gold that are in 2.3 moles of Au = 2.3 *  6.02 * 10²³

The number of particles = 1.38 * 10²⁴ particles.

The number of moles of O₂ in 15.5 grams of O₂ = 15.5/32

The number of moles of O₂ = 0.48 moles

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 2.47 x 10²¹/ 6.02 * 10²³ * 62 g

The mass in grams of 2.47 x 10²¹ formula units of sodium oxide = 0.254 grams

The number of atoms of titanium in 23.4 Kg Ti = 6.02 * 10²³ * 23.4 * 1000/48

The number of atoms of titanium in 23.4 Kg Ti = 2.93 * 10²⁶ atoms

The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 75/18 * 1/2 * 32

The mass in grams of O₂ needed to produce 75.0 grams of H₂O = 66.67 grams of O₂

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 75/32 * 2 * 2 g

The mass in grams of H₂ that are needed to react with 75.0 grams of O₂ = 9.375 g.

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Answer:

the answer would be ion

hope this helps :)

Explanation:

The term "ion" is fairly general and it breaks up into cations and anions.

Cation has positive charge because it lost one or more electrons.

Anion has negative charge because it gained one or more electrons.

The "Ring of Responsibility" requires a 15- to 25-foot untreated buffer zone next to water bodies.

A buffer zone is an area of land that separates two or more countries, states, or territories, and is often demilitarized. The purpose of a buffer zone is to provide a space for negotiations and to reduce the possibility of conflict and war. Buffer zones can also be used to protect sensitive natural resources or habitats, such as areas of wilderness or wildlife. Buffer zones can be permanent or temporary, and can range in size from a few miles to hundreds of miles. In addition to physical barriers, buffer zones can also include economic, political, and social measures to reduce tensions between two or more parties. Buffer zones are an important tool in international relations, as they can help to prevent armed conflict and promote peaceful resolution of disputes.

This buffer zone is intended to prevent pollutants from entering the water body and protect it from potential environmental damage.

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Answer:

if you ask yahoo answers it will tell you

Explanation:

hope i helped

Answer:

-2856

-792

endothermic, exothermix, exothermic, endothermic

no

Explanation:

When the forward and reverse response rates are equal, a system is in equilibrium. The rate of the forward reaction rises when more reactants are introduced.

In a state of equilibrium, the rates of forward and backward reactions are equal. This complies with the equilibrium's definition. whenever a reversible reaction takes place in a closed vessel.

On occasion, the products combine to reconstitute the reactants. Forward reaction refers to the process by which reactants transform into products. The reverse reaction is defined as the transformation of products into reactants.

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Answer:

Explanation:

Limiting is HCl and excess is Ca(OH)2

excess is 296 grams Ca(OH)2

2 moles H2O will be formed

The best description of a type C tympanogram is Negative peak pressure, lower than normal compliance.

option C

A type C tympanogram indicates negative pressure in the middle ear, which means that the peak of the tympanogram is shifted to the negative pressure side of the graph.

In addition, the compliance, or the ability of the ear to move in response to sound, is lower than normal. This can be caused by conditions such as Eustachian tube dysfunction or blockage, middle ear effusion, or allergies.

Thus, the best description of a type C tympanogram is Negative peak pressure, lower than normal compliance.

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The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.

sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .

sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .

so, the ratios are not the same.

Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.

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Answer:

a. H₂CO₃(aq) + KOH(aq) ⇄ K₂CO₃(aq) + H₂O(l)

b. 0.603 M

Explanation:

Step 1: Write the neutralization reaction

H₂CO₃(aq) + KOH(aq) ⇄ K₂CO₃(aq) + H₂O(l)

Step 2: Calculate the reacting moles of KOH

22.9 mL of 1.430 M KOH react.

0.0229 L × (1.430 mol/L) = 0.0327 mol

Step 3: Calculate the reacting moles of H₂CO₃

The molar ratio of H₂CO₃ to KOH is 1:1. The reacting moles of H₂CO₃ are 1/1 × 0.0327 mol = 0.0327 mol.

Step 4: Calculate the molarity of H₂CO₃

0.0327 moles of H₂CO₃ are in a volume of 54.2 mL. The molarity of H₂CO₃ is:

M = 0.0327 mol/0.0542 L = 0.603 M

The concentration (molarity) of the final NaCl solution is 175 M.

To find the concentration (molarity) of the final NaCl solution, we can use the equation:

M1V1 = M2V2

Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we have an initial NaCl solution with a concentration of 2.5 M and a volume of 350 mL (0.350 L). We are diluting this solution to a total volume of 5.0 mL (0.005 L).

Plugging these values into the equation, we have:

(2.5 M) * (0.350 L) = M2 * (0.005 L)

Simplifying the equation:

0.875 = 0.005 * M2

Dividing both sides by 0.005:

M2 = 0.875 / 0.005

M2 = 175M

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When answering questions on the Brainly platform, it is important to always be factually accurate, professional, and friendly. It is also important to be concise and avoid providing extraneous amounts of detail. Typos or irrelevant parts of the question should be ignored.

In this experiment, the student will examine how atoms absorb and emit photons which are particles of light. If an atom emits a photon, this leads to a negative change in the atom's energy. The sign for this change in energy is negative, making this process exothermic.

Exothermic processes release energy into the environment, usually in the form of heat or light. When an atom emits a photon, it is releasing energy in the form of light. This means that the energy of the atom is decreasing, and the process is exothermic.

In contrast, endothermic processes absorb energy from the environment. These processes require energy to occur, and their sign for change in energy is positive. In the context of this experiment, if an atom were to absorb a photon, its energy would increase, and the process would be endothermic.

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Calcium sulfate (CaSO4) is a chemical compound made from calcium, oxygen, and sulfur.

The major sources of calcium sulfate naturally happen are gypsum and anhydrite, which occur at many position worldwide as evaporites.

A simple procedure for preparing acicular calcium sulfate dihydrate is on condition that in which a slurry of calcium carbonate carrying 100 to 800 grams per lite of calcium carbonate is assorted with a solution of sulphuric acid carrying 80 to 500 grams per liter sulphuric acid in proportions that construct calcium sulfate.

So we can conclude that Calcium sulfate, CaSO4, is a natural happen calcium salt.

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The balanced chemical equation for the reaction of sodium with water is  

2 Na + 2 H₂O  \(\rightarrow\) 2 NaOH +H₂

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Step 1

The reaction must be written, completed, and balanced:

Li3N(s) + 3H2O(l) → NH3(g) + 3LiOH(aq)

----------

Step 2

Information provided:

The mass of Li3N = 98.7 g

Information needed:

The molar masses,

Li3N) 34.8 g/mol

H2O) 18.0 g/mol

----------

Step 3

By stoichiometry,

1 mole Li3N = 34.8 g

1 mole H2O = 18.0 g

Procedure:

Li3N(s) + 3H2O(l) → NH3(g) + 3LiOH(aq)

34.8 g Li3N ---------- 3 x 18.0 g H2O

98.7 g Li3N ----------- X

X = 98.7 g Li3N x 3 x 18.0 g H2O/34.8 g Li3N = 153 g approx.

Answer: 153 g of water

Answer:

First, we need to determine the molar mass of HCl.

The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.

Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:

6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles

Finally, we can use the molar mass to convert moles to grams:

10 moles x 36.45 g/mol = 364.5 grams

Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.

A hot metal with a low heat capacity will raise the final temperature of water more than a hot metal with high heat capacity.

It is the amount of heat required to change the temperature of a substance by just a unit.

Substances that heat up quickly are said to have low heat capacities while those that take time to heat up are said to have high heat capacities.

Substances with low heat capacity also release their thermal energy quicker than those with high heat capacity.

Thus, a hot metal with low heat capacity will readily transfer its thermal energy to water than a hot metal with high heat capacity.

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Answer:

Not really, the chances you will get hurt are insignificant

Explanation:

Answer:

\(m_{O_2}=120gO_2\)

Explanation:

Hello!

In this case, since the decomposition of potassium chlorate is:

\(2KClO_3\rightarrow 2KCl+3O_2\)

We can see a 2:3 mole ratio between potassium chlorate and oxygen (molar mass 32.0 g/mol), thus, via stoichiometry, we compute the mass of oxygen that are produced by the decomposition of 2.50 moles of this reactant:

\(m_{O_2}=2.50molKClO_3*\frac{3molO_2}{2molKClO_3} *\frac{32.0gO_2}{1molO_2}\\\\m_{O_2}=120gO_2\)

Best regards!

Answer:

Alkali gases

Explanation:

Noble gases - Group 18

Alkaline Earth Metals - Group 2

Transition metals - Group 3 - 12

Alkali gases do not exist on the periodic table

Answer:

a. C > F > Cl

Explanation:

We know that atomic mass of Chlorine is greater than of  Florine than that of carbon. Moreover, in CF2Cl2, therefore, there are two atoms of Cl, F and one atom of C. Therefore, in CF2Cl2 in order of decreasing mass percent composition C > F > Cl. Therefore, the correct option is a.