The following values are measured in the laboratory: 40.0 g +0.7631g +
610.70 g. The correct total recorded (with the correct sig figs) by the lab
technician was
*
651.5 g
651.4631 g
651.46 g
651 g

The first and second half-lives for this reaction can be calculated using the following equation: t1/2 = 0.693/k, where k is the rate constant.

Using a rate constant of 0.0022 s-1, the first and second half-lives would be 313.6 s and 627.2 s, respectively. To calculate the time it takes for 90.0% completion, we can use the equation:

t = t1/2 * ln(0.1/C), where C is the initial concentration of the reactant.

Using an initial concentration of 1 and the first half-life of 313.6 s, it would take 577 s for 90.0% completion.

Learn more about  first order reaction:

https://brainly.com/question/518682

#SPJ4

Answer:

boron

Explanation:

Boron and aluminum lie in same group in modern periodic table and both have three valence electrons

Psychochemical may persist for hours or days after exposure.

Chemical substances that have brief, reversible effects on the body or mind are known as psychochemical agents, often known as incapacitating substances. Psychochemical agents have a longer-lasting effect than riot-control chemicals, which only have a few-minute duration. Central nervous system (CNS) stimulants and depressants both fall within the category of psychochemical substances.

Drugs that depress the central nervous system (CNS) prevent the CNS from functioning and prevent information from traveling across neuron synapses. 3-Quinuchdedinyl Benzilate is an illustration of this group of chemicals, and it has an impact on memory, problem-solving, focus, and instruction-listening abilities. Instead of affecting one's ability to think, cannabinoids and phenothiazines cause sleepiness and a lack of motivation. Although 10,000 times more strong than morphine, fenyls are opiates that have a similar effect.

Learn more about Psychochemical here:

https://brainly.com/question/23693316

#SPJ4

Answer:

399.88 g/mol

Explanation:

Iron(III) sulfate, is the chemical compound with the formula Fe₂(SO₄)₃. Usually yellow, it is a salt and soluble in water. A variety of hydrates are also known. Solutions are used in dyeing as a mordant, and as a coagulant for industrial wastes.

To determine if the internal energy of a system increases or decreases, we usually analyze changes in its temperature, volume, or pressure. If the temperature rises, it signifies an increase in internal energy, and vice versa.

The diagram in question represents a decrease in the internal energy of the system. This is because the final state of the system is at a lower energy level than the initial state. In terms of the absence of work associated with the process, it is important to note that the change in internal energy of a system is determined by the heat added to or removed from the system. If there is no work involved in the process, then the heat transferred must be the only factor contributing to the change in internal energy. Therefore, if heat is added to the system, it is endothermic as the internal energy of the system increases, whereas if heat is removed from the system, it is exothermic as the internal energy of the system decreases.

To learn more about temperature visit;

https://brainly.com/question/11464844

#SPJ11

The temperature of the food or beverage during consumption affects the volatiles.

The flavor of food or beverages is influenced by the presence of volatile compounds, which are responsible for the aroma and taste. These volatile compounds are released from the food or beverage and interact with our olfactory receptors, contributing to the overall sensory experience. Temperature plays a crucial role in this process.

When food or beverages are heated, the temperature increase leads to an increase in the volatility of certain compounds. Higher temperatures can cause the evaporation of volatile compounds, releasing them into the air and enhancing the aroma and flavor perception. For example, heating coffee can intensify its aroma due to the increased release of volatile coffee compounds.

On the other hand, cold temperatures can also affect flavor perception. Lower temperatures can decrease the volatility of certain compounds, leading to reduced aroma and flavor intensity. This is why some foods or beverages may taste less flavorful when consumed cold compared to when they are warm.

In summary, the temperature of the food or beverage during consumption affects the volatility of compounds, which in turn impacts the flavor perception. Controlling the temperature can play a significant role in enhancing or diminishing the sensory experience of the food or beverage.

Learn more about Temperature from this link:

https://brainly.com/question/7510619

#SPJ11

The species which  is oxidized in the voltaic cell is Li. The voltaic cell functions due to the transfer of electrons from Li to Au^3+ ions, which results in the oxidation of Li and the reduction of Au^3+ to Au.

In a voltaic cell, chemical reactions occur to generate electricity. In this particular voltaic cell, the anode is made of lithium (Li) and the cathode is made of gold (Au) in the form of Au^3+ ions. The half-reaction that occurs at the anode is the oxidation of Li to Li+ ions, while at the cathode, the reduction of Au^3+ ions to Au occurs.
During oxidation, electrons are lost by the species being oxidized. In this case, lithium loses an electron and becomes a positively charged ion (Li+). Therefore, lithium is the species that is being oxidized in the voltaic cell.
The reduction of Au^3+ ions to Au involves a gain of electrons. The electrons generated from the oxidation of Li at the anode are transferred to the cathode where they are used for the reduction of Au^3+ ions to Au. This reduction reaction allows for the flow of electrons from the anode to the cathode, generating electricity.

For such more questions on oxidation

https://brainly.com/question/13182308

#SPJ11

The rotational kinetic energy of the person after the changing of its moment of inertia will become half of his initial rotational kinetic energy.

According to the law of conservation of angular momentum, the angular momentum before and after the change of moment of inertia should remain same system is unaffected by any external force.

So, we can write,

Initial angular momentum = final angular momentum

IW = iw

Where,

I is the initial moment of inertia,

W is the initial angular velocity,

i is the final moment of inertia,

w is the final angular velocity.

Now, putting all the values,

IW = 2I(w)

w = W/2

The final angular velocity is half of the initial angular velocity.

We know that the rotational kinetic energy of a body is given by.

E = 1/2IW²

If E is the initial rotational kinetic energy then the final rotational kinetic energy E' will be,

E' = 1/2I(w)²

Putting the values,

E' = 1/2I(W/2)²

E' = E/2

So, the final rotational kinetic energy of the person after the change will be the half of his initial rotational kinetic energy.

To know more about rotational kinetic energy, visit,

https://brainly.com/question/25803184

#SPJ4

Answer:

1. 2.1 moles of Mg

2. 0.72 mole of Mg(OH)2

Explanation:

1. We'll begin by writing the balanced equation for the reaction. This is given below:

3Mg + 2AlBr3 —> 3MgBr2 + 2Al

From the balanced equation above, 3 moles of Mg reacted to produce 2 moles of Al.

Therefore, Xmol of Mg will react to produce 1.4 moles of Al i.e

Xmol of Mg = (3 x 1.4)/2

Xmol of Mg = 2.1 moles.

Therefore, 2.1 moles of Mg is required to 1.4 moles of Al.

2. We'll begin by calculating the number of mole in 26g of water, H2O.

This is illustrated below:

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O = 26g

Number of mole of H2O =?

Mole = Mass /Molar Mass

Number of mole of H2O = 26/18

Number of mole of H2O = 1.44 moles

Next, we shall write the balanced equation for the reaction. This is given below:

2HNO3 + Mg(OH)2 —> Mg(NO3)2 + 2H2O

Finally, we can obtain the number of mole of Mg(OH)2 used in the reaction as follow:

From the balanced equation above,

1 mole of Mg(OH)2 reacted to produce 2 mole of H2O.

Therefore, Xmol of Mg(OH)2 will react to produce 1.44 moles of H2O i.e

Xmol of Mg(OH)2 = (1 x 1.44)/2

Xmol of Mg(OH)2 = 0.72 mole.

Therefore, 0.72 mole of Mg(OH)2 was used in the reaction.

Answer:

Limiting reactant: lead(II) nitrate (Pb(NO3)2).

Mass of sodium nitrate (NaNO3) = 12.92 g.

Explanation:

What is given?

Mass of lead (II) nitrate (Pb(NO3)2) = 25 g.

Mass of sodium iodide (NaI) = 30 g.

Molar mass of Pb(NO3)2 = 331 g/mol.

Molar mass of NaI = 150 g/mol.

Molar mass of sodium nitrate (NaNO3) = 85 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Lead (II) nitrate (Pb(NO3)2) reacts with sodium iodide (NaI) in a double-replacement reaction to produce sodium nitrate (NaNO3), and PbI2:

Now, let's calculate the number of moles of each reactant using its molar mass. The conversion from grams to moles for Pb(NO3)2 will look like this:

And for NaI:

The next step is to see how many moles of NaNO3 are being produced. We're going to need the chemical equation: let's start with Pb(NO3)2. 1 mol of Pb(NO3)2 reacted produces 2 moles of NaNO3, so we will obtain:

And now, let's see that 2 moles of NaI reacted produce 2 moles of NaNO3, so the molar ratio between these compounds is 1:1, which means that 0.20 moles of NaI reacted will produce 0.20 moles of NaNO3 too:

Based on these calculations, you can note that the limiting reactant would be Pb(NO3)2 because this compound imposes the limit because is being consumed first, it is producing the maximum amount of NaNO3 that we can produce in this reaction.

The final step is to calculate the mass of NaNO3 that is being produced. Remember as Pb(NO3)2 is the limiting reactant and it produces 0.152 moles of NaNO3, we use this data to find the mass of NaNO3 using its given molar mass too, like this:

The answer is that the limiting reactant is lead (II) nitrate (Pb(NO3)2) and we're producing 12.92 g of sodium nitrate (NaNO3).

Answer:

Rust is muddy red in color.

Explanation:

When iron or iron alloys are exposed to atmospheric air which contains moisture, it gets oxidized and forms rust. Rust is not desirable. The piece of iron converts into iron oxide when it is exposed to moisture or oxygen due to oxidation reaction.

Rust gives a flaky reddish brown color to the metal and it becomes more worse over the time. Rust consists of hydrated iron (3) oxides i.e. \($Fe_2O.nH_2O$\) and iron(III) oxide-hydroxide i.e. \($FeO(OH),Fe(OH)_3$\).

The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

To know more about decomposition here

https://brainly.com/question/20418092

#SPJ4

--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

The given chemical equation 2w + 3x - 3y + z, the limiting reactant can be determined by calculating the moles of each reactant and comparing them.

We need to first understand what a limiting reactant is. A limiting reactant is the reactant that gets consumed completely during a chemical reaction, thereby limiting the amount of products that can be formed. In other words, the reaction will stop once the limiting reactant is completely used up.
To determine the limiting reactant in this case, we need to calculate the number of moles of each reactant present. The equation shows that we need 2 moles of w and 3 moles of x to react with 3 moles of y and 1 mole of z.
If we have 5 units of w, we need to convert this to moles.

Assuming each unit represents 1 gram (for simplicity), we have 5 grams of w. The molar mass of w is not given, so we cannot directly calculate the number of moles. Similarly, if we have 6 units of x, we need to convert this to moles as well.
Once we have calculated the number of moles of each reactant, we can compare them to see which one is the limiting reactant. The reactant that produces the least amount of product is the limiting reactant.
To determine the limiting reactant in the given chemical equation, we need to calculate the number of moles of each reactant and compare them to see which one produces the least amount of product.

For more information on limiting reagent kindly visit to

https://brainly.com/question/14449503

#SPJ11

The splitting pattern multiplicity of the peaks would be determined by the number of neighboring hydrogen atoms that are chemically different from the hydrogen.

The 1H NMR Hydrogen spectrum of CH3CH2SH would show four peaks corresponding to the four distinct types of hydrogens present in the molecule: methyl (CH3), methylene (CH2), and the two hydrogen atoms on the sulfur. The chemical shift of the methyl protons would be around 0.9-1.2 ppm and the chemical shift of the methylene protons would be around 2.0-2.2 ppm. The chemical shift of the hydrogen atoms on the sulfur would be around 2.7-3.0 ppm.

For example, the methyl protons would show a singlet (one peak) because each methyl hydrogen has only one neighboring hydrogen that is chemically distinct. The methylene protons would show a doublet (two peaks) because each methylene hydrogen has two neighboring hydrogens that are chemically distinct. The hydrogen atoms on the sulfur would show a triplet (three peaks) because each hydrogen on the sulfur has three neighboring hydrogens that are chemically distinct.

The hydrogen integration values would correspond to the number of hydrogen atoms that give rise to each peak in the spectrum. For example, the integration value of the singlet peak corresponding to the methyl protons would be 3, because there are three methyl hydrogens in the molecule. The integration value of the doublet peak corresponding to the methylene protons would be 2, because there are two methylene hydrogens in the molecule. The integration value of the triplet peak corresponding to the hydrogen atoms on the sulfur would be 2, because there are two hydrogen atoms on the sulfur.

To learn more about  1H spectrum :

https://brainly.com/question/29896682

#SPJ4

Chlorobenzene can be converted into benzoic acid using Grignard reagent. Thus, treating with Mg metal in dry ether followed by carboxylation and then hydrolyising the product gives benzoic acid.

Grignard reagents are alkyl magnesium halides with the general formula RMgX. They can be prepared by treating alkyl halides with Mg metal in presence of dry ether.

Chlorobenzene when treated with Mg gives MgCl substituted benzene ring which upon carboxylation using carbon dioxide followed by hydrolysis gives benzoic acid.

Therefore, the reagents needed for the conversion of chlorobenzene to benzoic acid are Mg, CO₂ and water.

To find more on Grignard reagents, refer here:

https://brainly.com/question/14702056

#SPJ1

Answer: Cr2NiO7 is the molecular formula for nickel II dichromate.

Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings

A one-step process would require a higher energy input and may not be as economically viable. The two-step process for producing methanol from methane and water is used because it is more thermodynamically favorable.

The first step, which produces carbon monoxide and hydrogen gas, has a positive ΔH∘ of 214.7 J/K, meaning it requires energy input. However, the second step, which produces methanol from the carbon monoxide and hydrogen gas, has a negative ΔH∘ of -332.3 J/K, meaning it releases energy. By combining these two steps, the overall ΔH∘ for the reaction is negative and energy is released, making the process more efficient. A one-step process would require a higher energy input and may not be as economically viable.
Methanol (CH3OH) is produced from methane (CH4) and water (H2O) through a two-step process. In Step 1, methane and water react to form carbon monoxide (CO) and hydrogen gas (H2). This reaction has a standard enthalpy change (ΔH°) of 214.7 kJ and a standard entropy change (ΔS°) of -332.3 J/K at 298 K.

To know about methane :

https://brainly.com/question/12645635

#SPJ11

Answer:

i bought it cuz i need a cup?

Explanation:

Answer:

Best chemistry ever tho

Explanation:

LOL

Answer:

The volume(V) of gas will increase when the pressure of the gas decreases assuming all the other variables are held constant.

Explanation:

Nick can explain to his daughter Layla that the sun left the sky and turned it dark because of a natural process called the day-night cycle.

The Earth rotates on its axis, and as it does so, different parts of the world face the sun, experiencing daylight. When the Earth continues to rotate and their location faces away from the sun, they experience night, and the sky turns dark. The best explanation for why the sky is now dark is that it is nighttime, and their part of the Earth is not facing the sun.

To know more about day-night cycle

https://brainly.com/question/15228031

#SPJ11

The concentration of gypsum in solution increased while that of sulfates decreased. The rate of gypsum precipitation decreased with time.

The experimental results revealed that the concentration of gypsum in solution increased with time, while that of sulfates decreased. This trend can be explained by the reaction between calcium and sulfate ions in the solution, which led to the precipitation of gypsum. The concentration of sulfate ions in solution decreased with time due to their consumption in the reaction.

As a result, the rate of gypsum precipitation decreased over time. The findings suggest that the reaction was not complete, and that a fraction of sulfate ions remained in solution. To investigate this further, one could perform additional experiments to measure the concentration of sulfate ions at various time points during the reaction.

In addition, one could study the effect of temperature, pH, and other parameters on the reaction rate and the properties of the gypsum crystals formed. Finally, one could compare the experimental results with theoretical models to gain a deeper understanding of the reaction kinetics and mechanisms.

Learn more about gypsum here:

https://brainly.com/question/18369612

#SPJ11

Ques.1: Why do you think that you had to use a thin layer of onion skin, rather than a thick layer for the microscope?

Ans:- It is because, I the onion peel is thick layered, then it will be hard or impossible to see through the microscope.

Ques.2: When iodine reacts with starch, it produces a blue-black color. Starch is a white substance which plants use to store food. What structure did you see better because of the iodine? Why did you see this structure better?

Ans: Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil.

This makes a linear triiodide ion complex with is soluble that slips into the coil of the starch causing an intense blue-black color.

Due to this, we can see the structure better.

Ques.3: From low power to high power, what structures became clearer in the stained onion tissue?

Ans: From lower to higher power, we can see:-

-- Large, rectangular interlocking cells,

-- Clearly visible distinct cell walls surrounding the cells,

-- Dark stained nucleus,

-- Large vacuoles at the center,

-- Small granules may be observed inside the cells (within the cytoplasm)

Ques.4: What is the shape of an onion cell?

Ans: The shape of an onion cell is rectangular or square in shape.

The amount of water that is produced is 5.2 moles.

We know that in this case, we would have to use the stoichiometry of the reaction so as to obtain the amount of water that would be obtained. Here we know that we must first get the reaction equation as follows;

\(Mg(OH)_{2} + 2HCl ---- > 2H_{2}O + MgCl_{2}\).

Then we would now apply the stoichiometry of the reaction thus;

If 1 mole of magnesium hydroxide produces 2 moles of water

2.6 moles of magnesium hydroxide would produce 2.6 * 2/1

= 5.2 moles

Learn more about reaction:https://brainly.com/question/28984750

#SPJ1

Answer: A

Explanation: Based on the Law of conservation of mass the total mass of the reactants will equal to the total mass of the products. This happens as matter is not destroyed.

Considering the definition of density and intensive and extensive properties, the density of each piece of gold is 19.3 \(\frac{g}{cm^{3} }\)

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.

Intensive properties are those that will remain unchanged even though the amount of matter varies, while extensive properties vary depending on the amount of matter in a body.

Density is an intensive property, so it is independent of the sample size. This is because the solute will be present in a certain proportion with respect to the solvent. That ratio will not change unless more solute or more solvent is added. Consequently, the concentration remains constant (concentration is an intensive property) and density too.

Finally, the density of each piece of gold is 19.3 \(\frac{g}{cm^{3} }\)

Learn more about density:

There is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off

Soil erosion is influenced by various factors, including slope steepness, rainfall intensity, soil characteristics, vegetation cover, and land management practices. As slope steepness increases, the potential for soil erosion generally increases due to the gravitational force acting on the eroded materials. However, there is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off. The relationship between slope steepness and soil erosion is generally non-linear. At low slope angles, soil erosion tends to be minimal as the gravitational force is relatively weak. As the slope angle increases, soil erosion typically increases exponentially due to the increased force of gravity. Eventually, as the slope steepness continues to increase, soil erosion may reach a point of maximum potential where the erodibility of the soil and other factors become limiting factors. Beyond this point, the rate of soil erosion may start to taper off, but it does not completely stop. Instead, it may stabilize or decrease slightly compared to the maximum erosion potential observed at steeper slopes.

for more questions on erosion
https://brainly.com/question/13067562
#SPJ8