When a negatively charged object and a positively charged object are brought together, electrons transfer until both objects have the ______ _______

The vocabulary are:

Bank - Metric Ruler - Gram - Kilo - Graduated Barrel - Electric Adjust - Milli - Meter - Triple Pillar Adjust - Centi - Liter - Measuring utencil .

Metric Framework Realistic Organizer Appraisal

This base unit: Mass

These apparatuses are:

Researchers degree... Volume

This base unit: Liter

These devices:

This base unit: Meter

These instruments:

They all utilize these commonly known and utilized Prefixes:

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The form of radioactivity that penetrates matter the least is alpha radiation. Alpha particles are essentially helium nuclei that consist of two protons and two neutrons. They are the heaviest and slowest-moving particles among the three main types of radiation (alpha, beta, and gamma).

Alpha particles can only travel a short distance in the air, and they are easily stopped by even a piece of paper. This is because they have a high ionization potential and lose energy rapidly as they collide with atoms and molecules in the matter they pass through.

However, they can be dangerous if they are ingested or inhaled, as they can damage living tissues and cause harm to internal organs. Therefore, precautions should be taken when handling alpha-emitting materials, such as wearing protective clothing and using appropriate shielding to prevent exposure to alpha particles.

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Solution with a pH of 2 is 100 times more acidic than a solution with a pH of 4. The correct answer is d. 100.

A solution with a pH of 2 is how many times more acidic as a solution with a pH of 4?

To determine this, follow these steps:

Step 1: Calculate the difference in pH levels.
Difference = pH of 4 - pH of 2 = 4 - 2 = 2

Step 2: Use the formula for comparing acidity levels.
Acidity Ratio = 10^(Difference) = 10⁻²

Step 3: Find the answer.
Acidity Ratio = 100

Solution with a pH of 2 is 100 times more acidic than a solution with a pH of 4. The correct answer is d. 100.

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The total maximum number of electrons with the given quantum numbers is 2 (from the p-orbital) + 4 (from the d-orbital) is 6.

The maximum number of electrons in an atom that can have the quantum numbers n=4, m=+1 is 6.
1. The principal quantum number (n) refers to the energy level of an electron in an atom, which is 4 in this case.
2. The magnetic quantum number (m) represents the orientation of an orbital in space and has a value of +1.
3. To determine the maximum number of electrons, we need to find the possible values of the angular momentum quantum number (l) for the given n and m values.
For n = 4, the possible values of l are: 0, 1, 2, and 3. However, since m = +1, the l values that can accommodate this m value are 1 and 2.
4. The l = 1 corresponds to the p-orbital, which can accommodate 2 electrons with m = +1 (spin up and spin down).
5. The l = 2 corresponds to the d-orbital, which can accommodate 4 electrons with m = +1 (two spin up and two spin down).

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The gas sample with 1 gram of H2 has greatest volume.

The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. We can rearrange this equation to solve for V:

V = nRT/P

We can see that the volume of gas is directly proportional to the number of moles (n) of gas. Therefore, to determine which sample has the greatest volume, we need to compare the number of moles of each gas.

To do this, we can use the molar mass of each gas, which tells us how many grams are in one mole of the gas. We can then use the given mass of each sample to calculate the number of moles:

A. 1 gram of O2

Molar mass of O2 = 32 g/mol

Number of moles = 1 g / 32 g/mol = 0.03125 mol

C. 1 gram of Ar

Molar mass of Ar = 40 g/mol

Number of moles = 1 g / 40 g/mol = 0.025 mol

D. 1 gram of H2

Molar mass of H2 = 2 g/mol

Number of moles = 1 g / 2 g/mol = 0.5 mol

From the calculations above, we can see that 1 gram of H2 has the greatest number of moles and therefore the greatest volume. Therefore, the answer is D. 1 gram of H2.

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The Lewis Structure for the cyanide ion is shown. The formal charge on the C atom is equal to 0 and the formal charge on the N atom is equal to -1.

In order to determine the formal charges on the C and N atoms in the cyanide ion, we must first draw its Lewis structure.
Draw the Lewis structure for the cyanide ion (CN-).
C is triple bonded to N, with an additional lone pair of electrons on N. Since it is an ion, there is a negative charge on the molecule.
Calculate the formal charge on the C atom.
The formula for formal charge is: (number of valence electrons) - (number of lone pair electrons) - 0.5*(number of bonding electrons). Carbon has 4 valence electrons, no lone pair electrons, and 6 bonding electrons (from the triple bond). Therefore, the formal charge on the C atom is 4 - 0 - 0.5*6 = 0.
Calculate the formal charge on the N atom.
Nitrogen has 5 valence electrons, 2 lone pair electrons, and 6 bonding electrons (from the triple bond). The formal charge on the N atom is 5 - 2 - 0.5*6 = -1.

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While determining the melting point range of a sample, it is important to use a dry sample to ensure accuracy.

The sample is then weighed and placed in the melting point capillary. The capillary should be packed half full to ensure an accurate reading. The capillary is then placed into the melting point apparatus and the melting point range is recorded. It is important to record the range, not just the single melting point, to account for any impurities in the sample.

Therefore, the correct answers are A, B, and D. Weighing the sample ensures accuracy, recording the range accounts for any impurities, and using a dry sample ensures consistency in the experiment. Using a capillary ensures that the sample is heated uniformly, and the capillary helps to reduce the amount of sample required.

When determining the melting point range of a sample, it is essential to follow specific steps to ensure accurate results.

Firstly, using a dry sample is crucial, as any moisture in the sample can alter the melting point and lead to inaccurate data. Next, packing the capillary is an important step.

However, it should not be half full; instead, the sample should be compacted at the bottom of the capillary tube, with only a few millimeters of sample height to facilitate even heating.

Weighing the sample placed in the melting point capillary is not necessary, as the focus should be on the temperature range at which the sample transitions from solid to liquid, rather than the sample's mass.

Lastly, recording the melting point range is essential, as it provides crucial information about the sample's purity and consistency. The melting point range starts when the first signs of melting occur and ends when the entire sample becomes a liquid.

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A volumetric flask is designed to hold a specific volume of solution (in this case, 10 mL) at a specific temperature and pressure. By filling the flask to the mark and using proper mixing techniques, we can ensure that the final solution has the desired concentration.

To calculate the volume of 1 M Cu(NO3)2 (aq) needed to prepare a set of solutions that have concentrations in the range of 1 M to 1x10-4 M in a 10-mL volumetric flask, we can use the following equation:

C1V1 = C2V2

Where C1 is the initial concentration (1 M), V1 is the initial volume (unknown), C2 is the final concentration (ranging from 1 M to 1x10-4 M), and V2 is the final volume (10 mL).

We can rearrange the equation to solve for V1:

V1 = (C2V2) / C1

Substituting the values given in the question, we get:

V1 = (C2 x 10 mL) / 1 M

We can plug in different values of C2 to find the volume needed to prepare solutions of varying concentrations. For example, if we want to prepare a 1x10-4 M solution, we would get:

V1 = (1x10-4 M x 10 mL) / 1 M = 0.001 mL or 1 µL

It's important to use a volumetric flask to accurately measure the volume needed. Using a different type of container or measuring device could result in inaccuracies in volume and concentration.

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Ligases catalyze the formation of bonds between molecules, specifically through a process called ligation. The characteristic feature of these reactions is that they require the input of energy, often in the form of ATP hydrolysis.

Ligases are a type of enzyme that catalyze a group of biochemical reactions known as ligation or condensation reactions. These reactions involve the formation of covalent bonds between two molecules, coupled with the hydrolysis of a high-energy molecule such as ATP.

The characteristic feature of ligase-catalyzed reactions is the formation of a new chemical bond between two molecules, typically with the concomitant release of a small molecule such as water (in the case of DNA ligases) or pyrophosphate (in the case of ATP-dependent ligases).

Ligases play important roles in various biological processes such as DNA replication, DNA repair, and protein synthesis, where they are involved in the formation of covalent bonds between nucleic acids or amino acids, respectively.

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The Aldehydes contain a carbonyl group with a hydrogen atom attached to the adjacent carbon atom, while ketones have two alkyl or aryl groups attached to the carbonyl carbon. Because of this, aldehydes are more easily oxidized than ketones.

The addition of an oxidant, such as Tollens' reagent or Fehling's solution, will cause an aldehyde to be oxidized to a carboxylic acid, while a ketone will not be affected. This is because the oxidation of an aldehyde does not require breaking any C-C bonds, as the hydrogen atom can be removed and replaced with an oxygen atom to form a carbonyl group in the carboxylic acid. help with your question. In order to distinguish between aldehydes and ketones, many tests involve the addition of an oxidant. Aldehydes can be easily oxidized because they have a hydrogen atom adjacent to the carbonyl group, allowing for oxidation without breaking any carbon-carbon bonds. Ketones, on the other hand, cannot be easily oxidized due to the lack of a hydrogen atom next to the carbonyl group.

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The [H⁺] in a solution that has a pH of 9.16 is 6.9 x 10⁻¹⁰ M.

To calculate the [H⁺] (concentration of hydrogen ions) in a solution with a given pH value, you can use the following formula:

[H⁺] = 10^(-pH)

In this case, the pH value is 9.16. Applying the formula, we get:

[H⁺] = 10^(-9.16)

[H⁺] ≈ 6.9 x 10⁻¹⁰

The [H⁺] concentration in this solution is approximately 6.9 x 10⁻¹⁰ M (molar). Remember that the pH scale ranges from 0 to 14, where values below 7 are acidic (high [H⁺] concentration) and values above 7 are basic (low [H⁺] concentration). In this case, the pH of 9.16 indicates that the solution is slightly basic, as expected with a relatively low [H⁺] concentration.

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To calculate the molar ratio, [Salt]/[Acid], required to prepare an acetate buffer of pH 5.0, we need to use the Henderson-Hasselbalch equation, which is:

pH = pKa + log ([Salt]/[Acid])

Given the information, we have pH = 5.0, and pKa = 4.76. Plugging these values into the equation, we get:

5.0 = 4.76 + log ([Salt]/[Acid])

Now, we'll solve for the molar ratio ([Salt]/[Acid]):

Step 1: Subtract the pKa from the pH to isolate the log term.
5.0 - 4.76 = log ([Salt]/[Acid])

Step 2: Calculate the difference.
0.24 = log ([Salt]/[Acid])

Step 3: Remove the log by using the antilog (10^x) on both sides.
10^0.24 = [Salt]/[Acid]

Step 4: Calculate the antilog.
1.74 = [Salt]/[Acid]

So, the molar ratio [Salt]/[Acid] required to prepare an acetate buffer of pH 5.0 is 1.74.

To express the result in mole percent of the salt, we use the following equation:

Mole percent of salt = ([Salt] / ([Salt] + [Acid])) * 100

Since the molar ratio is 1.74, it means that for every 1 mole of acid, there are 1.74 moles of salt. Using the equation:

Mole percent of salt = (1.74 / (1.74 + 1)) * 100

Mole percent of salt ≈ (1.74 / 2.74) * 100

Mole percent of salt ≈ 63.5%

Therefore, the mole percent of the salt in the acetate buffer is approximately 63.5%.

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The mass of copper you should have produced is calculated based on the stoichiometry of the reaction and on the amount of CuCl₂ available during this reaction.

The quantities of the reactants and products of a stoichiometric chemical reaction ensure that all reactants are consumed and none are left over after the reaction is finished.

Calculate a reaction's stoichiometry by:

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The four stages of food processing are essential for animals to obtain the nutrients and energy they need to survive and thrive.

These four main stages of food processing in animals occur in the following order:


1. Ingestion: This is the first stage, where the animal takes in food through its mouth or other specialized structures. During this stage, the food is not yet broken down into small molecules that can be used by the body.

2. Digestion: This is the stage where the food is physically and chemically broken down into small molecules that can be absorbed by the body. This stage occurs in two parts:

- Mechanical digestion: This involves the physical breakdown of food into smaller pieces through chewing, grinding, or other mechanical processes.
- Chemical digestion: This involves the breakdown of food into smaller molecules through the use of enzymes and other chemical processes.

3. Absorption: This is the stage where the small molecules derived from food are taken up by cells in the body, where they can be used to provide energy or build and repair tissues.

4. Elimination: This is the final stage, where waste materials that cannot be used by the body are eliminated from the body as feces or urine.

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All three statements are generally true about the salt bridge I.cations travel to the cathode and anions travel to the anode. ii. electrons travel through the salt bridge from the cathode to the anode. iii. the salt bridge used in this lab will have k and no3- ions.

i. Cations, which are positively charged ions, travel to the cathode (the negatively charged electrode), and anions, which are negatively charged ions, travel to the anode (the positively charged electrode), through the salt bridge. This is necessary to maintain electrical neutrality in the half-cells.

ii. Electrons do not travel through the salt bridge; they flow through an external circuit connecting the two half-cells. The salt bridge allows the flow of ions, which balances the charge buildup in the half-cells, and completes the circuit.

iii. The salt bridge used in the lab can contain any combination of cations and anions, depending on the specific electrolyte being used. However, K+ and NO3- are commonly used as they are highly soluble and have low reactivity.

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28.85 grams of hydrogen sulfide (H2S) are formed.

To answer the first question, we can use the ideal gas law equation:
PV = nRT
Where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
Plugging in the given values, we get:
(2.78 atm) * (13.6 L) = n * (0.08206 L atm/mol K) * (398 K)
Solving for n, we get:
n = 0.423 moles of methane (CH4)
For the second question, we need to use stoichiometry to find the number of moles of H2S produced from the given number of moles of CH4. From the balanced chemical equation, we know that for every 1 mole of CH4, 2 moles of H2S are produced.
So, we can set up a ratio:
2 moles H2S / 1 mole CH4
Multiplying this by the number of moles of CH4 we found earlier, we get:
2 moles H2S / 1 mole CH4 * 0.423 moles CH4 = 0.846 moles H2S
Finally, we can convert moles of H2S to grams using its molar mass:
0.846 moles H2S * 34.08 g/mol = 28.85 g H2S
Therefore, 28.85 grams of hydrogen sulfide (H2S) are formed.

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complete question:

how many moles of methane, ch4, are present if the reaction conditions are 398 k, 2.78 atm, and 13.6 l? if the methane, ch4, is produced according to the chemical reaction shown below, how many grams of hydrogen sulfide, h2s, are formed?CS (g) + 4H (g) CH (g) +2 H,S(g)  For the calculations in this module, the molar mass of an element will be rounded to the hundredths place (0.01 g).

Nuclear chain reactions occur when a nucleus is split into two or more smaller nuclei, releasing a large amount of energy in the process.

This energy is released as heat and radiation, and can be harnessed for use in nuclear power plants or weapons. The reaction is initiated by bombarding a nucleus with a neutron, causing it to split and release more neutrons. These neutrons then collide with other nuclei, causing them to split and release even more neutrons. This creates a chain reaction that can continue until all of the available fuel is consumed.
  The speed of the reaction is affected by several factors, including the number of available neutrons, the size of the nucleus being split, and the presence of materials that can absorb or reflect neutrons. If there are too few neutrons, the reaction will not sustain itself and will quickly fizzle out. If there are too many neutrons, the reaction will become uncontrollable and could result in a dangerous explosion.

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The correct answer is b. Hemiacetals contain one OR group and one OH group, while acetals contain two OR groups. This difference in functional groups is what distinguishes hemiacetals from acetals.

Hemiacetals can be converted into acetals through a dehydration reaction, where water is eliminated and a new OR group is formed, replacing the OH group. A hemiacetal contains one oxygen atom bonded to two carbon atoms, while an acetal contains two oxygen atoms bonded to two carbon atoms. The oxygen atom in a hemiacetal is bonded to one OR group and one OH group, while the two oxygen atoms in an acetal are both bonded to OR groups. Because of this difference in the types of groups attached to the oxygen atom, the reactivity of the two compounds is quite different. Hemiacetals are more reactive than acetals, and they can be converted to aldehydes and ketones more easily. Acetals, on the other hand, are more stable and are less likely to undergo rearrangements or other reactions.

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Note that the time taken for Matthew to hear the sound of the trains from the train station to  where he lives is analyzed as follows:

When its warm (38°) = 2.55 seconds

When it's cold (-4°)= 2.74 seconds.

First note that the above   result confirms that speed of sound is  impacted by temperature and as such will travel faster when it's warm and less fast when it's cold such as in winter.

To compute the difference in time taken for mathew to hear the train's whisltle, first, let  us see the speed of sound in the given temperatures (T).

Note that the formula for speed of of sound is given as:

v = 331.3m/s x √(1+(T/273.15))

1) Where T = 38° (Summer)

v = 331.3m/s x √(1+(38/273.15))
v = 353.59 m/s

2) Where T = -4° (Winter)
v = 331.3m/s x √(1+(-4/273.15))
v = 328.87 m/s

Now to the time taken to hear the Whistle.

To compute the time, we use the formula:

t (time) = Distance/ Speed

Recall that Distance = 900m

hence

t (summer) = 900/ 353.59

t (summer) = 2.55 seconds


t(winter) = 900/ 328.87

t(winter) = 2.74

Thus, since t(summer) is less than t(winter) we can state that it Mattew will hear the sound of the whistle faster in the summer by 0.19 seconds.

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Certain molecules, such as those containing beryllium or boron, can be electron deficient with fewer electrons surrounding the central atom than what would be expected based on its valence electrons.

This leads to a formal charge of zero on the central atom, despite the lack of electrons. This is because the electrons are shared between the atoms in the molecule, resulting in a stable arrangement. In these cases, the atoms are able to form covalent bonds with other atoms to make up for the lack of electrons, allowing the molecule to exist as a stable entity. These compounds are highly stable and have low boiling points, making them gaseous at room temperature.

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The "per" suffix is used for the anion with the "most" oxygens. This is commonly used in oxyanions, where the "per" prefix indicates that the anion contains the maximum number of oxygen atoms for a given series of oxyanions.

The -ate suffix is used for the anion with the greater number of oxygens. When naming anions, suffixes such as -ide, -ite, and -ate are used to indicate the number of oxygen atoms present in the anion.

                                           Anions with the least number of oxygen atoms end in -ide, while those with one less oxygen than the -ate ion end in -ite. Anions with the greatest number of oxygen atoms end in -ate. Therefore, when the anion has the greater number of oxygens, it is named with the -ate suffix.

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The equilibrium constant of the reaction can be obtained as  7.3 * 10^15

There is this formula that should be playing in your head anytime that you see a question that looks like this and we are just going to use that formula to solve the question that we have in the case of the problem that I have in this question and that is;

ΔG = -RTlnK

ΔG = Change in free energy

R = gas constant

T = temperature

K = equilibrium constant

-90.5 * 10^3 = -8.314 * 298 * lnK

lnK = -90.5 * 10^3/ -8.314 * 298 *

= 36.5

K = 7.3 * 10^15

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Prediction of the geometry of NO2^- using the VSEPR method. Here are the steps:

1. Identify the central atom: In NO2^-, the central atom is nitrogen (N).
2. Count the total number of valence electrons: Nitrogen has 5 valence electrons, each oxygen has 6, and there is an additional electron due to the negative charge. So, the total number of valence electrons is 5 + 2(6) + 1 = 18.
3. Distribute the electrons in the Lewis structure: Place the single bonds between the central atom (N) and the surrounding atoms (O) first. Then, complete the octet for the outer atoms (O). Finally, place any remaining electrons on the central atom.
4. Calculate the electron pair geometry: There are two bonding pairs (N-O) and one lone pair on the central atom (N). This corresponds to a total of three electron groups, which results in a trigonal planar electron pair geometry.
5. Determine the molecular geometry: Since there are two bonding pairs and one lone pair, the molecular geometry is bent (also known as V-shaped or angular).

In conclusion, the geometry of NO2^- using the VSEPR method is bent.

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When a chemical reaction occurs, electrons are transferred or shared between the reactants to form products. However, the charges of the reactants and products do not cancel out. This is because the number of electrons transferred or shared may not be equal, leading to an imbalance of charges.

For example, in the reaction between sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl), Na loses an electron to Cl to form Na+ and Cl-. The charges of the reactants are +1 for Na and 0 for Cl, while the charges of the products are +1 for Na+ and -1 for Cl-. These charges do not cancel out, resulting in an overall charge of 0 for NaCl.

This is important to consider when balancing chemical equations and predicting the behavior of reactions. It also highlights the importance of understanding the concept of charges in chemistry.
In some chemical reactions, the charges between reactants and products may not cancel out completely. This is often the case when the reaction involves ions with different charges. It is important to note that charge conservation must be maintained, meaning the total charge on the reactants' side must equal the total charge on the products' side.

To better understand this concept, let's consider a simple example. In the reaction between sodium (Na) and chlorine (Cl) to form sodium chloride (NaCl), the charges between reactants and products do cancel out.

Reactants: Na (neutral) + Cl (neutral)
Products: Na^+ (positive) + Cl^- (negative)

The charges on the reactants' side are neutral, and on the products' side, the positive and negative charges of the ions balance each other, maintaining charge conservation.

However, in a reaction like the following:

2 Al + 3 Br2 → 2 AlBr3

Reactants: 2 Al (neutral) + 3 Br2 (neutral)
Products: 2 Al^3+ (6 positive charges) + 6 Br^- (6 negative charges)

In this case, the charges between reactants and products do not cancel out individually, but the total charges on both sides of the reaction are still equal (zero). The charge conservation principle is maintained as the sum of charges on the reactants' side equals the sum of charges on the products' side.

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The process that is exothermic among the given processes is a) a candle flame.

Exothermic processes are those in which energy is released in the form of heat and light. In this process, energy is transferred to the surroundings and hence the change in enthalpy is negative.

a) a candle flame is an example of an exothermic process as wax burns in the presence of oxygen, giving off heat and light in the process. It is an example of combustion.

b)baking bread is an example of the endothermic process and not an exothermic process as energy is taken from the surroundings or heat is supplied to the dough to make it rise.

c)The chemical reaction in a "cold pack" is an example of endothermic as energy is taken from the surroundings and hence it creates a cooling effect.

d)The vapourization of water is also an example of the endothermic process as energy is taken from the surroundings.

Hence from the above-mentioned reasons, it is clear that option (a) a candle flame is correct.

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{The prediction will be, I2 will be found mainly in the top layer because it will dissolve more in the C6H14(l). The correct option is C.

When C6H14(l) and H2O(l) are mixed, they form two separate layers due to their difference in density. Since the density of C6H14(l) is lower than that of H2O(l), it will form the top layer, while the denser H2O(l) will form the bottom layer. When I2(s) is added to the mixture and shaken again, it will dissolve mainly in the layer in which it is more soluble.

I2 is more soluble in C6H14(l) than in H2O(l), so it will dissolve more in the top layer of C6H14(l). Therefore, the best prediction is that I2 will be found mainly in the top layer because it will dissolve more in the C6H14(l) (Option C).

Iodine (I2) is a nonpolar substance, and it is more likely to dissolve in the nonpolar hexane (C6H14) than in the polar water (H2O). Since hexane is less dense (0.66g/mL) than water (1.00g/mL), it will form the top layer, and thus, the iodine will mainly dissolve in the top layer.

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The volume of one mole of gas at Albuquerque, when the temperature is 25°C and the pressure is 650 torr, is approximately 22.4 liters per mole.

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The  answer to this question is that the half-life for a zero-order reaction can be determined using the formula

t1/2 = A0 / 2k, where A0 is the initial absorbance and k is the rate constant.

Plugging in the given values, we get t1/2 = 0.580 / (2 x 7.6 x 10^-4) = 382.89 hours.

The half-life of a reaction is the amount of time it takes for half of the initial reactant concentration to be consumed.

In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactants. This means that the rate constant (k) remains constant throughout the reaction, and the half-life is directly proportional to the initial concentration of the reactant (A0).

The formula t1/2 = A0 / 2k takes into account the fact that it takes twice as long for the concentration to decrease from A0 to A0/2 as it does to decrease from A0/2 to zero.

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The Correct, a Z isomer has its highest priority substituents on the same side of the double bond. This means that when the substituents are "loaded" onto the molecule from A to Z, they are on the same side of the double bond.

The important to note that the opposite is true for the E isomer, where the highest priority substituents are on opposite sides of the double bond. A Z isomer has its highest priority substituents on the same side of the double bond. This means that the groups with the highest atomic number (or highest priority) are located on the same side of the molecule, resulting in the Z configuration.

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The enthalpy change of the reaction is 1344 kJ/mol.

To calculate the enthalpy change of the reaction, we need to use the bond energies of the bonds broken and formed in the reaction. The balanced chemical equation for the reaction is:

C(s) + 2H2O(g) → 2H2(g) + CO2(g)

The bonds broken are:

2 C-H bonds in C(s)

4 O-H bonds in 2 H2O(g)

The bonds formed are:

4 H-H bonds in 2 H2(g)

2 C=O bonds in CO2(g)

The bond energies (in kJ/mol) are:

C-H: 413

O-H: 463

H-H: 436

C=O: 799

Using these bond energies, we can calculate the enthalpy change of the reaction as follows:

Enthalpy change = (bond energies of bonds broken) - (bond energies of bonds formed)

Enthalpy change = [2(C-H) + 4(O-H)] - [4(H-H) + 2(C=O)]

Enthalpy change = [2(413) + 4(463)] - [4(436) + 2(799)]

Enthalpy change = [826 + 1852] - [1744 + 1598]

Enthalpy change = 1344 kJ/mol

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