A decomposition of hydrogen peroxide into water and oxygen gas is an exothermic reaction. If the temperature is initially 28˚ C, what would you expect to see happen to the final temperature?Explain what is happening in terms of energy of the system and the surroundings.

2.40 ×10²⁴ molecules are there in 4.00 moles of glucose, C₆H₁₂O₆. A molecule is a collection of at least two atoms.

According on the context, the word can or cannot encompass ions that meet this requirement. A molecule is a collection of at least two atoms bound together by the attractive forces called as chemical bonds.

When speaking of polyatomic ions, the difference between them and ions is frequently ignored in the fields of quantum theory, organic chemistry, especially biochemistry.

number of molecule = number of moles ×  6.022×10²³

                                  = 4×  6.022×10²³

                                 = 2.40 ×10²⁴ molecules

Therefore, 2.40 ×10²⁴ molecules are there in 4.00 moles of glucose, C₆H₁₂O₆.

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Answer:

Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is  in fact true of every element located under oxygen in the periodic table.

P.S. hope this helps :)

Answer:

Rubidium Chloride is an excellent water soluble crystalline Rubidium source for uses compatible with chlorides.

Compound Formula: ClRb

Melting Point: 715 °C

Boiling Point: 1,390 °C

Explanation:

Answer:

Yes

Explanation:

A atom is made out of 3 elements, protons which are positive charges, electrons which are negative charges that swirl around the atom, and a neutron with a neutral charge. The nucleus of the atom is basically the center of the atom.

Answer:

This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance.

More specifically, the inclusion criteria are:

Elementary particles from the Standard Model of particle physics that have so far been observed. The Standard Model is the most comprehensive existing model of particle behavior. All Standard Model particles including the Higgs boson have been verified, and all other observed particles are combinations of two or more Standard Model particles.

Antiparticles which were historically important to the development of particle physics, specifically the positron and antiproton. The discovery of these particles required very different experimental methods from that of their ordinary matter counterparts, and provided evidence that all particles had antiparticles—an idea that is fundamental to quantum field theory, the modern mathematical framework for particle physics. In the case of most subsequent particle discoveries, the particle and its anti-particle were discovered essentially simultaneously.

Composite particles which were the first particle discovered containing a particular elementary constituent, or whose discovery was critical to the understanding of particle physics.

concentration of the acetone immediately after mixing

We are given:

- Molarity of Acetone\($=4.0 \mathrm{M}$,\)

- Volume of Acetone\($=11 \mathrm{~mL}=0.011 \mathrm{~L}$,\)

- Volume of\($B r_2=16 \mathrm{~mL}$,\)

- Volume of \($\mathrm{HCl}=11 \mathrm{~mL}$\), and

- Volume of Water\($=16 \mathrm{~mL}$.\)

therefore Total Volume of Solution\($=(11+16+11+16) m L=54 m L=0.054 L$\)and

Total No. of moles \(\mathrm{M} \times 0.011 \mathrm{~L}$$=0.044 \mathrm{~mol}$\)of Acetone = Molarity of Acetone \($\times$\) Volume of Acetone i =4.0

\($\therefore$ Molarity of Acetone $=\frac{\text { No. of moles of Acetone }}{\text { Volume of solution in liter }}$\)

\($=\frac{0.044 \mathrm{~mol}}{0.054 \mathrm{~L}}$$=0.815 M$Hence, Concentration of Acetone (in Molarity) is $0.815 \mathrm{M}$.\)

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Answer:

Salt bridge

Explanation:

Salt bridge is used in an electrolytic cell to transfer electrons from the anode to the cathode.

Salt bridge are used because they do not interfere with the constituents of the cell I.e the anode (+very electrode) and cathode(-ve electrode).

Examples of salt bridges are AgNO₃, KCl etc.

Salt bridge can be described as a tool used to link the oxidation half cell and reduction half cell in an electrolytic set-up or galvanic cell.

Control of Reaction Rate Bromine is a highly reactive and potentially hazardous reagent. By adding it dropwise, we can control the rate at which the bromine reacts with the other reagents.

If bromine is added all at once, the reaction can become too vigorous and difficult to control. Adding it slowly allows for better regulation of the reaction rate.Minimization of Side Reactions: Bromination reactions can produce unwanted side products or byproducts. By adding bromine dropwise, we can minimize the formation of these side products. If all the bromine is added at once, the likelihood of side reactions occurring increases, leading to lower yields or undesired products.

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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.

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--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."--

i) KMnO4

lets calculate using x method

1+x+ 4(-2) = 0

1+x-8 =0

x= 7

ii)MnO4‐

x+4(-2) = -1

x-8 = -1

x = 7

This scientific project aims to analyze and implement strategies to rejuvenate a dying lawn, ensuring its vitality and health.

If you notice that a lawn looks unhealthy and the grass is dying, you can undertake a scientific project to save it by following these steps:

Step 1: Identify the problemThe first step is to identify the problem. Observe the lawn and try to determine what is causing the grass to die. Common causes include poor soil quality, lack of water, too much sun or shade, pests, or disease.

Step 2: ResearchOnce you have identified the problem, conduct research to find out more about it. Look for information about how to treat the specific problem that is causing the grass to die. You can consult gardening books or online resources.

Step 3: Develop a hypothesisBased on your research, develop a hypothesis about what is causing the problem. For example, if you think the soil quality is poor, your hypothesis might be that adding fertilizer will improve the health of the grass.

Step 4: Design an experimentDesign an experiment to test your hypothesis. For example, if your hypothesis is that adding fertilizer will improve the health of the grass, you could divide the lawn into two sections. Apply fertilizer to one section and not the other. Record your observations over time to see if the grass in the fertilized section is healthier.

Step 5: Conduct the experiment , Carry out your experiment, making sure to record your observations.

Step 6: Analyze the data Analyze your data and determine whether your hypothesis was correct. If the grass in the fertilized section is healthier than the grass in the section without fertilizer, your hypothesis was correct.

Step 7: Draw a conclusion Based on your analysis, draw a conclusion about what is causing the problem and how it can be fixed. For example, if your experiment showed that adding fertilizer improved the health of the grass, you could conclude that the soil quality is poor and that fertilizing the lawn will help to improve it.

Step 8: Take action Based on your conclusion, take action to fix the problem. In this case, you would apply fertilizer to the entire lawn to improve its health.

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Answer:

30

Explanation:

I’m pretty sure it is

Answer:

Ver explicacion

Explanation:

La gravedad es una fuerza que actúa a distancia. La fuerza que actúa entre la tierra y los cuerpos en ella es la fuerza gravitacional.

Es un ejemplo típico de una fuerza de acción a distancia.

Por lo tanto, la fuerza tat que existe entre la tierra y los cuerpos que se encuentran en ella es una fuerza de distancia.

To calculate the work that an object does when it moves covering a distance of 3000 meters when it is propelled by a force of 65 Newton, one of the principles of mechanics must be considered.

A force does work when there is a displacement of the center of mass of the body on which the force is applied, in the direction of said force.

The work of the force on that body will be equivalent to the energy necessary to displace it, so that:

W = F.d

Substituting the corresponding values in said formula:

F = 65N

d = 3000m

W = 65 N. 3000 m

W = 195000 W

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conjoined twins

during the embryo period the embryo becomes vlunerable to diseases the mother may have .

Taking into account the definition of Avogadro's number and molar mass, 3.49334×10²² molecules of sucrose are present.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

In first place, the molar mass of sucrose is 342 g/mole. So, you can apply the following rule of three: If by definition of molar mass 342 grams of the compound are contained in 1 mole, 20 grams of the compound are contained in how many moles?

\(amount of moles=\frac{20 gramsx1 mole}{342 grams}\)

amount of moles= 0.058 moles

Now, considering the Avogadro's number, you can apply the following rule of three: If 1 mole of the compound contains 6.023×10²³ molecules, 0.058 moles contains how many molecules?

amount of moleculas= (6.023×10²³ molecules × 0.058 moles)÷ 1 mole

amount of molecules= 3.49334×10²² molecules

Finally, 3.49334×10²² molecules of sucrose are present.

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Among others, NO2, carbonyl groups (C=O), sulfonyl, and cyano (CN). The rate of electrophilic aromatic substitution is slowed by these groups' ubiquitous deactivating effects.

Activating groups are substitutes that quicken reactions (by lowering the activation energy). Deactivating groups are substitutes that slow down a reaction's pace (by increasing the activation energy).

Looking at the resonance structures reveals that the positive charge concentrates at the ortho-para positions because NO2 is an electron withdrawing group. These locations are thereby rendered inactive with respect to the electrophilic aromatic substitution.

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Answer:

No definite shape

Explanation:

Answer:

c

Explanation:

its not a plant based gas

When 1.34 g Zn(s) reacts with 60.0 mL of 0.750 M HCl(aq) , 3.14 kJ of heat are produced.the answer is not one of the choices given.

To solve for the enthalpy change per two moles of zinc reacting, we need to first calculate the moles of zinc reacted and the amount of heat produced.
The moles of zinc reacted can be found using its molar mass:
1.34 g Zn ÷ 65.38 g/mol Zn = 0.0205 mol Zn
The amount of heat produced can be found using q = mCΔT, where q is the heat produced, m is the mass of the solution (which we assume to be 60.0 g since 1 mL of water is approximately 1 g), C is the specific heat capacity of the solution (which we assume to be 4.18 J/g°C, the value for water), and ΔT is the change in temperature (which we assume to be negligible since the reaction is done at constant pressure).
q = (60.0 g)(4.18 J/g°C)(0°C) = 0 J
However, we are given that 3.14 kJ of heat are produced, which is equivalent to 3140 J. Therefore, we need to adjust the moles of zinc reacted to account for this amount of heat:
3140 J ÷ (-2 mol HCl)(-46.1 J/mol°C) = 0.0345 mol Zn
Now we can calculate the enthalpy change per two moles of zinc reacted:
ΔH = q ÷ n = (3140 J) ÷ (0.0345 mol Zn ÷ 2) = -181609 J/mol
Converting to kJ/mol and rounding to the nearest whole number, we get:
ΔH = -182 kJ/mol
Therefore, the answer is not one of the choices given.

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Answer:

15

Explanation:

atomic number is the same as protons so 15 protons and 15 electrons would be neutral

a. Entropy, S = S(U, L, N) for the one-dimensional gas is given by the Sackur-Tetrode equation which is given by:

b. The equation of state, P= P(T, L, N) for the one-dimensional gas is given by the equation of state for an ideal gas which is given by:

Gas is one of the four basic states of matter. Pure gases can be made up of atoms, elemental molecules made up of one type of atom, or compound molecules made up of many kinds of atoms. A mixture of gases will contain as many pure gases as air. Each gas has the same volume at the same temperature and pressure according to Avogadro's law. The volume of 1 mole of gas is 22.4 liters at standard conditions. Here are examples of gaseous objects around you. Air. Smoke. Nitrogen.

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Answer:

its got to be one of these

Examples of Simple Unbranched Alkanes

Name Molecular Formula Name

methane CH4 hexane

ethane C2H6 heptane

propane C3H8 octane

butane C4H10 nonane

Explanation:

The time required to plate 29.6 g of nickel at 4.7 A is approximately 348 minutes or 5.8 hours. To calculate the time required to plate 29.6 g of nickel at 4.7 A, we need to use Faraday's law of electrolysis,

Which states that the amount of metal plated is directly proportional to the amount of electric charge passed through the solution.

The half reaction given in the question shows that 2 electrons are needed to plate 1 nickel ion (Ni2+) into solid nickel (Ni). Therefore, the amount of charge required to plate 1 mole of nickel is 2 * 96,485 C/mol = 192,970 C/mol.

The molar mass of nickel is 58.69 g/mol, so the number of moles in 29.6 g is 29.6 g / 58.69 g/mol = 0.504 mol.

The total charge required to plate this amount of nickel can be calculated as follows:

Charge (C) = 0.504 mol * 192,970 C/mol = 97,317 C

Now we can use the formula:

Time (s) = Charge (C) / Current (A)

Converting the answer to minutes, we get:

Time (min) = Time (s) / 60

Substituting the given values, we get:

Time (min) = 97,317 C / 4.7 A / 60 = 348.1 min

Therefore, the time required to plate 29.6 g of nickel at 4.7 A is approximately 348 minutes or 5.8 hours.

In terms of the answer choices provided, the closest option is 4.8 * 10^2 min, which is equivalent to 480 min or 8 hours. This is slightly higher than the calculated value of 348.1 min, but it is reasonable given that the actual plating process may have some additional factors that could affect the outcome.

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It would take approximately 352 minutes (5.9 hours) to plate 29.6 g of nickel at 4.7 A.

The amount of charge needed to plate 1 mole of nickel is 2 Faradays or 96485 C. The molar mass of nickel is 58.69 g/mol. Therefore, the amount of charge required to plate 29.6 g of nickel is (29.6 g / 58.69 g/mol) × 2 × 96485 C/mol = 3.07 × 10^6 C.

The current, I = Q/t, where Q is the charge and t is the time in seconds. Therefore, t = Q/I = (3.07 × 10^6 C) / (4.7 A) = 6.53 × 10^2 s or 352 minutes. It would take approximately 352 minutes (5.9 hours) to plate 29.6 g of nickel at 4.7 A. The amount of charge required to plate the given amount of nickel is calculated using Faraday's law, which is then divided by the given current to obtain the required time. The final result is approximately 352 minutes.

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Answer:

a new substance is produced

Explanation:

i just took my test and got this question right

The best evidence that a chemical reaction occurs when coal burns is a new substance is produced. The correct option is A.

Coal is a carbon containing fossil fuel, which is formed when the organic matter is decomposed inside the earth with heat and pressure by the earth crust. It is the most used fossil fuel.

Carbon dioxide is a gas produce when these fossils fuel burned. It is a green house gas and increase the warmth of the earth when produced. It is taken by plants to make their food.

When coal burns, it produces carbon dioxide which is a gas and coal is a solid, so here the chemical reaction is happening which is producing a new substance.

Thus, the correct option is A. A new substance is produced.

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The volume of the square shown in the diagram, given that it has a length of 4 in. is 64 in³

Volume of a square is given by the following formular:

Volume = Length × Width × Height

Recall:

For square shapes, length, width and height are equal i.e

Length = Width = Height

Thus, we can write that the volume of square as:

Volume of square = Length × Length × Length

Now, we shall obtain the volume of square. Details below:

Volume of square = Length × Length × Length

= 4 × 4 × 4

= 64 in³

Thus, the volume of the square is 64 in³

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Answer: Dmitri Mendeleev and Henry Moseley

Chemical energy in the form of wood or charcoal is transformed into thermal energy (heat) through combustion.

The thermal energy is then transferred to the cooking vessel, heating the food inside and causing various chemical reactions to occur, such as denaturation of proteins and caramelization of sugars.

As the food cooks, the thermal energy is also transferred to the surrounding air, causing it to expand and rise, creating convection currents that help distribute the heat more evenly.

Some of the thermal energy is also lost to the environment through radiation and conduction, which can cause the cooking vessel and surrounding surfaces to become hot to the touch.

nergy is constantly being transformed and transferred in a variety of ways as food is cooked over a fire, resulting in the delicious meals we enjoy.

Homolytic bond cleavage of Br-Br produces two bromine radicals with a single unpaired electron on each atom.

In the homolytic bond cleavage of Br-Br, the bond between the two bromine atoms breaks, and each atom receives one electron from the bond.

This results in the formation of two bromine radicals (Br•), with each atom having a single unpaired electron.

There are no charges formed in this process, as the cleavage leads to equal distribution of the shared electrons.

In a molecular diagram, curved arrows can be drawn to indicate the movement of electrons towards each bromine atom, with the product showing the bromine radicals and their unpaired electrons.

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Br-Br's homolytic bond is broken into two bromine radicals, each of which has one unpaired electron.

The link between the two bromine atoms is broken during the homolytic bond cleavage of Br-Br, and each atom gains an electron as a result. As a result, two bromine radicals (Br•) are created, each of which has one unpaired electron. Since the shared electrons are distributed equally as a result of the cleavage, no charges are created during this process. The bromine radicals and their unpaired electrons can be seen when curved arrows are used to represent the passage of electrons towards each bromine atom in a molecular diagram.  Two curved arrows starting from the bond between the two Br atoms, indicating homolytic bond cleavage, resulting in two Br radicals (each with one unpaired electron). The expected product is two Br• radicals.

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Approximately x% of the acid is dissociated in a 0.50 M solution of HA at 25°C.

The percent dissociation of an acid can be determined using the acid dissociation constant (Ka) and the initial concentration of the acid (HA). The mathematical expression for percent dissociation is:

Percent Dissociation = (Dissociated HA concentration / Initial HA concentration) * 100

In this case, we are given that the acid dissociation constant (Ka) for acid HA is known at 25°C, and we have a 0.50 M solution of HA. However, the value of Ka and specific acid are not provided, so we cannot calculate the exact percent dissociation.

To calculate the percent dissociation, you would need the value of Ka for the specific acid, which indicates the extent of dissociation at equilibrium. Based on this value and the initial concentration of HA, you can calculate the dissociated HA concentration and then use the mathematical expression mentioned above to determine the percent dissociation.

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