how many atoms of al are in 2.45 mol of al

To determine the values of m and n in the general rate law expression r = k [FeCl3]^m [KI]^n, you'll need the initial rates obtained from method 1 and method 2, along with the concentrations of FeCl3 and KI used in each method.

For example, let's say method 1 has an initial rate r1 and uses [FeCl3]1 and [KI]1, and method 2 has an initial rate r2 and uses [FeCl3]2 and [KI]2.

Divide the rate law expressions for method 1 and method 2:

(r1 / r2) = k [FeCl3]1^m [KI]1^n / k [FeCl3]2^m [KI]2^n

Since k is constant, it cancels out:

(r1 / r2) = ([FeCl3]1 / [FeCl3]2)^m * ([KI]1 / [KI]2)^n

Now, using the given initial rates and concentrations, solve for m and n by manipulating this equation (e.g., taking the logarithm of both sides, isolating m or n, etc.). Keep in mind that you may need additional sets of initial rates and concentrations to fully solve for both m and n.

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Answer:

C.

Explanation:

It is a different type of the same atom

they have a different number of neurons

Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

Answer:

D)  single replacement

Explanation:

Given reaction:

         Mg       +           2HCl      →      MgCl₂        +        H₂

The reaction shown above is a single displacement reaction.

In a single displacement reaction, a more reactive atom displaces another from a given compound.

The comparison here is between Mg and H.

On the activity series, Mg is higher and more reactive, it will displace H from the solution of HCl. This

This reaction type is called a single replacement reaction.

The one produces the spectra in emission spectroscopy is  b. electronic transition from excited energy states to lower states.

The emission spectrum for the chemical element is the frequencies of the spectrum of the electromagnetic radiation that is emitted by the electrons due to the transition from the higher energy state to the lower energy state. The energy of the photon of the photon  emitted is equals the difference in energy between the two states.

The emission spectrum includes all the radiation that is emitted by the atoms or the molecules. The spectrum shows the intensity of the radiation at the different wavelengths.

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Answer:

That would be m = 410.76g

Explanation:

m = 1.26g/ml * 326 ml so therefore it is 410.76g

Hope this help.  

Answer:[Ar] 3d6 4s2

Explanation:

Search it up

According to Boyle's law, temperature being constant the volume of the balloon at pressure 3.3 atmospheres is 138.18 ml.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

Substitution in above equation gives, V₂=1×456/3.3=138.18 ml.

Thus, the volume of balloon is 138.18 ml.

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Answer:

1) AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)

Ag+ (aq) + NO3- (aq) + K+ (aq) + Cl- (aq) -> AgCl (s) + K+

(aq) + Cl- (aq)

Ag+ (aq) + Cl- (aq) -> AgCl (s)

2) 2NaCl (aq) + K2CO3 (aq) -> Na2CO3 (aq) + 2KCl (aq)

3) Fe(NO3)3 (aq) + 3NaOH (aq) -> Fe(OH)3 (s) + 3NaNO3

(aq)

Fe³+ (aq) + 3NO3- (aq) + 3Na+ (aq) + 3OH- (aq) ->

Fe(OH)3 (s) + 3Na+ (aq) + 3NO3- (aq)

Fe³+ (aq) + 3OH- (aq) -> Fe(OH)3 (s)

4) BaBr2 (aq) + Na2SO4 (aq) -> BaSO4 (s) + 2NaBr (aq)

Ba²+ (aq) + 2Br- (aq) + 2Na+ (aq) + SO4²- (aq) ->

BaSO4 (s) + 2Na+ (aq) + 2Br- (aq)

Ba²+ (aq) + SO4²- (aq) -> BaSO4 (s)

Explanation:

Sorry, I couldn't make the charges superscript. Don't know how.

On #2, no reaction occurs; everything stays aqueous.

Answer:

positive

Explanation:

protons have a positive charge

Answer:

Positive

Explanation:

Answer:

3 and 6 (weight change and nothing changes)

Explanation:

Hi there!

A chemical change is a change when matter changes into a new substance and has a new chemical property.

The signs that a chemical change is taking place are:

1. change in color

2. change in smell

3. change in energy (for example, there is a change in temperature (thermal energy))

4. a gas is formed (fizzing/bubbling/foaming are signs of this!)

5. formation of a solid (a precipitate)

A physical change is any change to the size, shape, or state of a substance. The substance still has the same chemical property.

these are your eight options:

1. tarnished is formed (a sign of a chemical change; a change in color)

2. gas is produced (a sign of a chemical change)

3. weight change (NOT a sign of a chemical change. Even though the weight changed, the substance still has the same chemical composition and therefore, there wasn't any change to its chemical identity)

4. Temperature change (a sign of a chemical change; a change in energy)

5. color change (a sign of a chemical change)

6. nothing changes (NOT a sign of a chemical change. If nothing happens, the substance is still the same as it was originally and there was no change to its chemical identity.)

7. forms a precipitate (a sign of a chemical change)

8. energy is released (a sign of a chemical change)

therefore the two options that are NOT a sign of a chemical change are 3 and 6 (weight change and nothing changes)

Hope this helps! :)

Answer:

D

Explanation:

Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.

The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.

A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).

Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.

Thus the correct option is D.

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Explanation:

\(CH _{3}CH _{2}COOCH _{2} CH _{2}CH _{2}CH _{2}CH _{2}CH _{3}\)

NAME: Hexylpropenoate

The plant most likely absorb from the water for the process that produces the oxygen gas is Carbon Dioxide .

What is photosynthesis ?

Photosynthesis is defined as the processes that bring about the manufacturing of food by green plants.

Food is complex energy-rich organic matter which living organisms feed on to obtain nutrients, substances necessary for life. Green plants which are known as autotrophs has the ability to produce their own food through the process of photosynthesis.

The main features of photosynthesis include:

It takes place in the chloroplasts of plants, in the presence of sunlight.

The energy needed for the process is gotten from sunlight which is absorbed by chlorophyll found in the chloroplasts.

The raw materials used are low-energy containing inorganic compounds, example: carbon dioxide and water.

The final products are high-energy containing sugars. oxygen is given off as a waste product.

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Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.

(its my own words, but i did search it to get this answer, hope it helps!)

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Answer:

Atomic number hopefully this will help

Atomic number

Explanation:

To prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.The ratio of benzoic acid to sodium benzoate in the buffer solution using the Henderson-Hasselbalch equation.

To prepare a pH 4.00 buffer solution using benzoic acid and sodium benzoate, we need to calculate the appropriate volumes of the 0.100 M benzoic acid and 0.240 M sodium benzoate solutions.

First, we need to determine the ratio of benzoic acid to sodium benzoate in the buffer solution. The Henderson-Hasselbalch equation can help us with this calculation:

pH = pKa + log([A-]/[HA])

Given that the pH is 4.00 and pKa is 4.20, we can rearrange the equation:

log([A-]/[HA]) = pH - pKa

log([A-]/[HA]) = 4.00 - 4.20

log([A-]/[HA]) = -0.20

Next, we take the antilog of -0.20 to find the ratio of [A-] to [HA]:

[A-]/[HA] = antilog(-0.20)

[A-]/[HA] = 0.63

The ratio of [A-] to [HA] is 0.63.

Now, let's calculate the volumes of each solution needed. Let's assume x represents the volume (in mL) of the 0.100 M benzoic acid solution and y represents the volume (in mL) of the 0.240 M sodium benzoate solution.

Since the total volume is 100.0 mL, we have the equation: x + y = 100

Considering the ratio of [A-] to [HA] as 0.63, we can write the equation: y/x = 0.63

Solving these two equations simultaneously will give us the volumes of each solution:

x + y = 100

y/x = 0.63

By substituting y = 0.63x from the second equation into the first equation, we get:

x + 0.63x = 100

1.63x = 100

x = 61.35 mL (rounded to two decimal places)

Substituting this value back into the equation x + y = 100, we find:

61.35 + y = 100

y = 38.65 mL (rounded to two decimal places)

Therefore, to prepare the pH 4.00 buffer solution, you should mix approximately 61.35 mL of the 0.100 M benzoic acid solution with 38.65 mL of the 0.240 M sodium benzoate solution.

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Answer:

Scientific theory differs from a guess or opinion because a scientific theory is a system of ideas that explains many related observation and is supported by a large body of evidence acquired through scientific investigation while guesses and opinions may not reliably predict an outcome, have evidence to back up the theory

Explanation:

A scientific theory is defined as the explanation of the universe and the natural sciences. It differs from opinions and guesses as they are supported by observations and evidence.

A scientific theory has been a  detailed description and explanation of the natural sciences and the universe that are studied and developed with the help of the hypothesis and the facts.

It relies on the scientific method to conclude the accountability by observing, estimating, and then concluding the matter with supportive evidence.

It differs from guess and opinions as it involves investigations, research, evidence to back the idea, whereas the latter and are not reliable and lacks evidence.

Therefore, scientific theory differs from opinion.

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The partial pressure of hydrogen gas is approximately 2.74 atm.

To find the partial pressure of hydrogen gas in this reaction, you can use the mole fraction and the ideal gas law (PV = nRT). First, convert the mass of each gas to moles using their molar masses:

Moles of hydrogen gas (H2) = 34.9 g / (2.02 g/mol) ≈ 17.3 moles
Moles of methane gas (CH4) = 17.7 g / (16.04 g/mol) ≈ 1.1 moles

Now calculate the mole fraction of hydrogen gas (X_H2):
X_H2 = moles of H2 / (moles of H2 + moles of CH4) = 17.3 / (17.3 + 1.1) ≈ 0.94

Lastly, use the mole fraction and total pressure to find the partial pressure of hydrogen gas:
Partial pressure of H2 = X_H2 * Total pressure = 0.94 * 2.92 atm ≈ 2.74 atm

So, the partial pressure of hydrogen gas is approximately 2.74 atm.

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Definition and Examples

Example:

One example of a thermal decomposition reaction is the breakdown of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) when it is heated:

This reaction is used in the production of cement, where limestone (which contains calcium carbonate) is heated to produce calcium oxide, which is a key ingredient in cement.

ATLAST :

thermal decomposition reactions are an important type of chemical reaction that have a wide range of industrial and scientific applications.

The maximum amount of iron (II) oxide that can be formed is 176.9 g if 23.1 g of iron reacts with 53.22 g of oxygen to produce iron (ii) oxide.

The balanced chemical equation for the reaction between iron and oxygen to produce iron (II) oxide is:

4Fe + 3O₂ → 2Fe₂O₃

From the equation, we can see that 4 moles of iron react with 3 moles of oxygen to produce 2 moles of iron (II) oxide.

Calculate the number of moles of each reactant using their respective molar masses:

Number of moles of iron = 23.1 g ÷ 55.845 g/mol

= 0.414 moles

Number of moles of oxygen = 53.22 g ÷ 32 g/mol

= 1.663 moles

Since the stoichiometric ratio of iron to oxygen is 4:3, we can see that oxygen is the limiting reactant because there are only 3 moles of oxygen available for every 4 moles of iron required.

Number of moles of Fe₂O₃ = 2 ÷ 3 × 1.663

= 1.108 moles

Mass of Fe₂O₃ = 1.108 moles × 159.69 g/mol

= 176.9 g

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Nasogastric intubation is a medical procedure in which a flexible tube is inserted through the nose and passed down the throat into the stomach. Enteral feedings refer to the delivery of nutrition directly into the gastrointestinal tract, specifically the stomach or small intestine

To prioritize actions for nasogastric intubation and enteral feedings in an adolescent, the following steps can be taken:

1. Prepare the formula, tubing, and infusion device: Gather all the necessary equipment required for the procedure, including the enteral feeding formula, appropriate tubing, and the infusion device (if using a pump). Ensure that the equipment is clean and in proper working condition.

2. Check expiration dates and note the content of the formula: Verify the expiration dates of the enteral feeding formula and discard any expired products. Take note of the nutritional content and any specific instructions provided by the healthcare provider regarding the formula.

3. Ensure that the formula is at room temperature: Some enteral formulas may require warming to room temperature before administration. Follow the manufacturer's instructions for warming if necessary, ensuring the formula is not too hot to avoid causing discomfort or harm.

4. Set up the feeding system via gravity or pump: Depending on the healthcare provider's order, set up the feeding system using either gravity or a pump. Follow the manufacturer's instructions for assembling the system correctly and securely.

5. Mix or shake the formula, fill the container, prime the tubing, and clamp it: If using powdered formula, mix it with the appropriate amount of water as directed by the manufacturer. Shake the formula well to ensure it is adequately mixed. Fill the container with the prepared formula and connect it to the tubing. Prime the tubing by allowing the formula to flow through it until all the air bubbles are removed. Clamp the tubing to prevent any spillage.

6. Assist the client to Fowler's position or elevate the head of the bed to a minimum of 30°: Position the adolescent in Fowler's position (sitting up at a 90-degree angle) or elevate the head of the bed to at least 30 degrees. This position helps prevent aspiration and facilitates the movement of the formula into the stomach.

7. Auscultate for bowel sounds and monitor tube placement: Use a stethoscope to auscultate the abdomen for bowel sounds. Absence of bowel sounds may indicate potential complications. Additionally, verify the placement of the nasogastric tube by checking for carbon dioxide detection, X-ray confirmation, or following facility-specific protocols.

8. Check gastric contents for pH: Aspirate a small amount of gastric contents using a syringe. Test the pH of the aspirate using pH strips or a pH meter. A pH range between 0 and 4 is considered a good indication of appropriate placement within the stomach.

9. Aspirate for residual volume: To assess gastric residual volume, use a syringe to withdraw the contents of the stomach through the nasogastric tube. Note the amount and appearance of the aspirate, as excessive residual volume may indicate feeding intolerance or delayed gastric emptying.

10. Flush the tubing with at least 30 mL of tap water: After checking gastric residual volume, flush the nasogastric tube with a minimum of 30 mL of tap water to ensure patency and prevent tube occlusion.

11. Administer the formula: Begin the enteral feeding by connecting the tubing to the nasogastric tube and initiating the flow of the formula according to the prescribed rate and schedule. Monitor the client's response during the feeding for any signs of intolerance or complications.

Throughout the procedure, adhere to proper infection control practices, maintain open communication with the adolescent and their family, and provide appropriate education and support.

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Citric acid is added to food to add tartness and enhance the flavor. The correct option is b.

Citric acid, a natural compound found in citrus fruits, is commonly added to food for its tart flavor and ability to enhance taste. Here's a step-by-step explanation:

1. Tartness: Citric acid is highly acidic and has a sour taste. When added to food, it provides a sharp, tangy flavor that adds tartness. This tartness can help balance the overall taste profile of a dish, especially in sweet or savory recipes.

2. Flavor enhancement: Citric acid acts as a flavor enhancer, intensifying the existing flavors in food. It has the ability to enhance the perception of other taste sensations, such as sweetness and saltiness, making food taste more vibrant and flavorful.

3. Preservation: Citric acid also acts as a natural preservative in some food products. It has antimicrobial properties that inhibit the growth of certain bacteria and fungi, helping to extend the shelf life of foods and prevent spoilage.

4. pH adjustment: Citric acid can be used to adjust the pH level of certain food products. It is commonly used in canning and preserving processes to create an acidic environment that inhibits bacterial growth and helps maintain product quality and safety.

Overall, the addition of citric acid to food primarily serves to enhance flavor, provide tartness, and potentially contribute to preservation. Option b is the correct one.

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The word which best describes a rock from the above options is a mixture of minerals.

The correct answer choice is option D

A rock consist of different kinds of mineral materials or mineral substances which are naturally occurring aggregate of solid mineral matter that constitute a significant part of the earth crust.

From the given option above, the only definition which talks about rock in totality is the one which says rock is a mixture of minerals.

There exist different kinds of mineral rocks, among which includes the following:

Igneous rocks: It is formed by the cooling of molten rock, either below the surface (intrusive) or on the surface (extrusive).

Metamorphic rocks: consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface.

Sedimentary rocks: formed by the deposition of either the weathered remains of other rocks, the results of biological activity, or precipitation from solution

So therefore, a rock is a solid substance which forms an important solid matter in the earth crust.

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Answer:

2ZnS(s) + 3O2(g) → 2ZnO(s) 2SO2(g)

(H = -879 kJ/mol would be the answer, I believe.

Explanation:

Brainliest Please?