What chemical change occurs as a candle burns?

A. The candle wax turns liquid as it burns.
B. The heat melts the candle wax.
C. The candle wax changes shape.
D.Heat and light are produced.

Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

Answer:

Your answer is B, Electrochemistry!

Explanation:

This is the part of chemistry that studies the chemical process in which electrons flow. This flow is called electricity. Electricity is generated by the flow of electrons, from one element to another element. This reaction is called oxidation reduction.

Answer: B

Explanation:

The  stage that takes place before the one in the diagram above is  metaphase II

Metaphase II is a stage in meiosis II, which is the second round of cell division that occurs during meiosis. Meiosis is a process of cell division that produces haploid cells (cells with half the number of chromosomes as the parent cell) from diploid cells (cells with the full number of chromosomes). Meiosis II begins after the completion of meiosis I, which produces two haploid cells from one diploid cell.

During metaphase II, the replicated chromosomes (each consisting of two sister chromatids) line up at the metaphase plate, which is an imaginary line that divides the cell into two halves.

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The mass (in kilograms) of Cryolite, Na₃AlF₆ produced, given that 10.3 Kg of Al₂O₃, 55.4 Kg of NaOH, and 55.4 Kg of HF react completely is 42.4 Kg

The mass of Na₃AlF₆ produced from the reaction can be obtained as follow:

Al₂O₃(s) + 6NaOH(l) + 12HF(g) ⟶ 2Na₃AlF₆ + 9H₂O(g

From the balanced equation above,

0.102 Kg of Al₂O₃ reacted to produce 0.420 Kg of Na₃AlF₆

Therefore,

10.3 Kg of Al₂O₃ will react to produce = (10.3 × 0.420) / 0.102 = 42.4 Kg of Na₃AlF₆

Thus, from the above calculation, it is evident that the mass of Na₃AlF₆ produced is 42.4 Kg

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Answer:

(~21~ Ne)Neon | Ne-pubchem

Answer:

the unit of force is newton represented with symbol "N"

Answer &

Explanation:

eukaryotic: Having complex cells in which the genetic material is contained within membrane-bound nuclei. cell: The basic unit of a living organism, consisting of a quantity of protoplasm surrounded by a cell membrane, which is able to synthesize proteins and replicate itself.

therefore it is cell

The concept ideal gas equation is used here to determine the volume of the carbondioxide. Combustion reactions are generally highly exothermic reactions. The volume of CO₂ is

A combustion is a chemical reaction in which a fuel undergoes oxidation as a result of the reaction with an oxidizing agent which causes the release of energy in the form of heat.

15.0 °C = 288 K

The ideal gas equation is:

PV = nRT

V = nRT / P

V = 354 × 0.0821 × 288 / 0.995 = 8412.3 L

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Answer:

The answer is 4

Explanation:

=1+98−97+4−3+2−1

=99−97+4−3+2−1

=2+4−3+2−1

=6−3+2−1

=3+2−1

=5−1

=4

Explanation:

Carbon-14 has a half life of 5730 years, meaning that 5730 years after an organism dies, half of its carbon-14 atoms have decayed to nitrogen atoms. Similarly, 11460 years after an organism dies, only one quarter of its original carbon-14 atoms are still around.

The some of the potential in the real world applications for the renewable energy sources such as the solar power and the wind power are  electricity generation, the water heating and cooling, and the transportation.

Renewable energy defined as the energy produced from the sources like the sun and the wind energy which are the naturally replenished and which do not run out.

The Renewable energy which can be used for the electricity generation, and the water heating and the cooling, and the transportation. The most sustainable sources of the energy are the renewable bioenergy. The Renewable sources of the, like the wind and the solar, it will emit the little to no the greenhouse gases.

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Answer:

H2 is the limiting reactant.

Explanation:

From the diagram above:

H2 => White ball

O2 => Red ball

Before the reaction

H2 => White ball => 10

O2 => Red ball => 7

After the reaction

H2O => White and red ball => 10

O2 => 2

From the simple illustration above, we can see that all the H2 were used up in the reaction but there are left over of O2.

This simply means that H2 is the limiting reactant as all of it is used up in the reaction while O2 is the excess reactant as there are leftover.

Answer:

B. Weathering and Erosion

Explanation:

I majored in Chemistry

Answer:

b

Explanation:

The volume the balloon will occupy at an altitude where the pressure is 0.600 atm and the temperature is -20.00 C is 6.15 L.

The ideal gas law can be used to solve the given problem, which is as follows:P1V1/T1 = P2V2/T2 Where:P1 is the initial pressure (1.00 atm)P2 is the final pressure (0.600 atm)V1 is the initial volume (4.50 L)V2 is the final volume (what we want to find)T1 is the initial temperature (20.00 C = 293.15 K)T2 is the final temperature (-20.00 C = 253.15 K)The problem does not provide the mass or number of moles of helium gas, but these quantities are not required to solve the problem as they cancel out in the calculation.The problem also does not mention any change in altitude, so we can assume that the balloon rises to an altitude where the pressure and temperature are lower.We can rearrange the equation above to solve for V2, which gives:V2 = (P1V1T2)/(P2T1) Substituting the given values gives:V2 = (1.00 atm × 4.50 L × 253.15 K)/(0.600 atm × 293.15 K)V2 = 6.15 L.

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Answer: As a result, each excited electron in an atom emits a photon of a specific wavelength. To put it another way, each excited noble gas emits a distinct hue of light. This is a reddish-orange neon light.

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:

Due to its weak intermolecular forces which make it volatile.

Explanation:

Hello,

In this case, antiseptic alcohol which chemically named as ethanol has a low boiling point (78.37 °C) and weak intermolecular forces of dipole-dipole kind, which make it volatile, it means it tends to rapidly vaporize even when it is not gently heated, therefore, even a weak force such as rubbing it, is enough to vaporize it out from the skin so it quickly dries.

Best regards.

Due to low boiling point and weak intermolecular force alcohol is volatile, which makes it to dry quickly from the skin.

• The substances with strong intermolecular forces exhibit lower vapor pressures and are less volatile, on the other hand, the substances with weak intermolecular forces exhibit higher vapor pressures and are more volatile.

• Ethanol, that is, the antiseptic alcohol exhibits a low boiling point of 78.37 degree C and weak intermolecular forces of dipole-dipole kind.

• The characteristics of low boiling point and weak intermolecular forces makes the alcohol volatile.

• It shows that even when it is gently rubbed onto the skin, it vaporizes.

Thus, due to the properties of alcohol, even a weak force like rubbing is adequate to vaporize it out from the skin, and therefore, it dries briskly.

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Answer:

Compound

Hope it helps!

The heat absorbed by the solution is 386.9 cal.

First, we need to calculate the heat absorbed by the solution using the formula:

q = m × c × ΔT

Where q is the heat absorbed, m is the mass of the solution, c is the specific heat constant, and ΔT is the change in temperature.

m = 45.4 g

c = 1 cal/g oC

ΔT = 31.5 oC - 23.0 oC = 8.5 oC

Substituting the values in the formula, we get:

q = 45.4 g × 1 cal/g oC × 8.5 oC

q = 386.9 cal

Therefore, the heat absorbed by the solution is 386.9 cal.

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The heat change or enthalpy change, ΔH°rxn, for the slow reaction of zinc with water is +417.7 kJ/mol.

The heat change or enthalpy change, ΔH°rxn, for the reaction of zinc (Zn) with water (H₂O) can be calculated using the standard enthalpies of formation for each species involved in the reaction.

Balanced chemical equation for the reaction is;

Zn(s) + 2H₂O(l) → Zn²⁺(aq) + H₂(g)

The standard enthalpy change for the reaction, ΔH°rxn, can be calculated as the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants, each multiplied by their respective stoichiometric coefficients;

ΔH°rxn = Σ(nΔH°f, products) - Σ(mΔH°f, reactants)

where n and m are the stoichiometric coefficients of the products and reactants, respectively, and ΔH°f is the standard enthalpy of formation.

Assuming standard conditions (25°C and 1 atm), the standard enthalpies of formation for Zn²⁺(aq) and H₂(g) are typically tabulated values. Let's assume their values to be ΔH°f(Zn²⁺(aq)) = -153.9 kJ/mol and ΔH°f(H₂(g)) = 0 kJ/mol, respectively.

The standard enthalpy of formation of water (H₂O) is -285.8 kJ/mol.

Put the values into the equation, we get;

ΔH°rxn = [ΔH°f(Zn²⁺(aq)) + ΔH°f(H₂(g)] - [ΔH°f(Zn(s)) + 2ΔH°f(H₂O(l))]

ΔH°rxn = [-153.9 + 0] - [0 + 2(-285.8)]

ΔH°rxn = -153.9 + 571.6

ΔH°rxn = 417.7 kJ/mol

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Answer:

Fe: 23.1%

N: 17.4%

O: 59.5%

Explanation:

You take the grams that each weigh on the periodic table and add it all up. Afterward you create fractions of each over the whole. (Example: Fe/Fe+N+O) then you divide and turn that decimal into a percentage.

Answer:

The amount of the first solution rick needs to mix together to create the love portion is 8.5 mL

Explanation:

So as to make the love potion, we have;

The percentage of carbonated water in the love portion = 40%

The percentage of green tea in the first solution = 65%

The percentage of carbonated water in the first solution = 15%

The percentage of whole milk in the first solution = 20%

The percentage of orange juice in the second solution = 17%

The percentage of lemonade in the second solution = 38%

The percentage of carbonated water in the second solution = 45%

Let 'x' represent the volume in mL of the first solution added to make the love portion, and let 'y' be the volume in mL of the second solution added to make the love portion, we have;

x + y = 51...(1)

0.15·x + 0.45·y = 0.40×51 = 20.4

0.15·x + 0.45·y = 20.4...(2)

Solving the system of simultaneous equation by making 'y' the subject of each of the equation gives;

For equation (1)

y = 51 - x

For equation (2)

y = 20.4/0.45 - (0.15/0.45)·x = 136 - 3·x

y = 136/3 - (1/3)·x

Equating the two equations of 'y', gives;

51 - x = 136/3 - (1/3)·x

51 - 136/3 = x - (1/3)·x

17/3 = (2/3)·x

(2/3)·x = 17/3

x = (3/2) × (17/3) = 17/2 = 8.5

x = 8.5

y = 51 - x = 42.5

y = 42.5

Therefore, the amount of the first solution rick needs to mix together to create the love portion, x = 8.5 mL

Answer:

matter i think

Explanation:

matter i am pretty sure

The law that allows calories to be determined by heat (energy) transfer from one substance to another, but it is never destroyed is first law of thermodynamics.

Energy cannot be generated or destroyed, only changed in form, according to the basic law of thermodynamics.

Hence first law of thermodynamics justify the given statement.

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Answer:

Explanation:

balance

2 C2H6 + 7  O2  --> 4 CO2 + 6 H2O

given 360 g H20 (g)

required =586.67 g CO2

360 g H20 x (1mole/18 g H20) X (4 mole CO2/6 moles H20) X (44g CO2/1mole) =586.67 g CO2

Answer: A

Explanation:

The -ane suffix implies that the compound has only single bonds for carbon-carbon bonds. The but- prefix implies that the compound consists of four carbons. Since 4 bonds are required for each carbon, there will be a total of 10 hydrogen atoms: 3 on each carbon at the end of the chain and 2 for each carbon in the middle of the chain. Thus, butane is A.

The remaining percentage of the original radioactive atoms is 321100=3. 125%.

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The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

From the question given above, the following data were obtained:

The number of mole in 0.512 g of CaCO₃ can be obtained as follow:

Mole = mass / molar mass

Mole of CaCO₃ = 0.512 / 100

Mole of CaCO₃ = 5.12×10⁻³ mole

Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet

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Answer:

protons: positively charged, located in the nucleus

electrons: negatively charged, located outside the nucleus

neutrons: no charge, located in the nucleus

Answer:

MgCI2+ ___ AgNO3-->___Mg(NO3)2

i think u put 2 before NO3

Explanation: