1. which of the following elements is NOT multivalent?

A. Be

B. Cu

C. Pb

D. Fe

Secondary amine is what it is. Option (B3-dimethylbutan-2-amine )'s is the primary organic product created during the following reaction. Thus, if more hydrogen is added to carbon, we will obtain the main product, according to the Markovnikov Rule.

As a result, the main product produced by adding hydrogen to carbon-1, which has a higher concentration of hydrogen, and adding bromine to carbon-2 is 2-bromopropane. When a reaction follows Markovnikov's rule, a chemical or product is said to be a major organic product. The tertiary alkyl iodide is the largest byproduct of the second process, which transforms alcohol into alkyl iodide, while the secondary alkyl iodide is the minor byproduct.

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Answer:

Isotopes

Explanation:

An isotope are the atoms of an element with similar chemical identity and number of protons but different atomic masses. This means that isotopes of an element differ from one another by their number of NEUTRONS.

For example, the uranium element possesses isotopes as follows: Uranium-235 and uranium-238. This two isotopes have the same chemical identity and number of protons/atomic no., which is 92. However, the atomic masses (235 and 238) are different.

Answer:

Isotopes

Explanation:

Answer:

number of moles of CO2 is 0.054

number of moles of CO is 0.107

number of moles of O2 remaining is 0.01 mole

mole fraction of CO is 0.63

Explanation:

Firstly, we write the equation of reaction;

3C(s) +2O2(g) → CO2(g) +2CO(g)

Now, we proceed.

From the written equation, we can deduce that

3 mol C = 2 mol O2 = 1 mol CO2 = 2 mol CO

No of mol of C reacted = 0.161 mol

limiting reactant according to the question is Carbon

a. no of mol of CO2 formed = 0.161*1/3 = 0.054 moles ( no of moles of CO2 formed is one-third of no of moles of carbon reacted. This is obtainable from their mole ratio 1:3)

b. no of mol of CO formed = 0.161*2/3 = 0.107 mol

c. no of mol of O2 remaining = 0.117 - (0.151*2/3) = 0.117-0.107 = 0.01 mole

d. mole fraction of CO = no of mol of CO/Total number of moles

= 0.107/(0.107+0.054+0.01)

= 0.625730994152 which is approximately 0.63

The number of moles of CO₂, CO, and O₂ formed is 0.054, 0.107, and 0.01 mole respectively.

And the mole fraction of CO is 0.63

The equation of reaction is given as the following:

3C(s) +2O₂(g) → CO₂(g) +2CO(g)

from above we can say that the number of moles required for the reaction to proceed is:

3 mol of C

2 mol of O₂

1 mol CO₂, and

2 mol CO

so the ratio is:

C:O₂:CO₂:CO = 3:2:1:2

Given that the number of mol of C produced is 0.161 mol

(i) number of mol of CO₂ formed = 0.161 × 1/3 = 0.054 moles

(ii) number of mol of CO formed = 0.161 × 2/3 = 0.107 mol

(iii) number of mol of O₂ remaining = 0.117 - (0.151 × 2/3)

                                                          = 0.117 - 0.107

                                                          = 0.01 mole

(iv) mole fraction of CO = (number of mol of CO) / (Total number of moles)

                                       = 0.107 / (0.107+0.054+0.01)

                                       = 0.63

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The calculation of quantities in chemical equations is called stoichiometry. So, the correct option is (d).

By definition, stoichiometry is applying the relationships found in the balanced chemical equation to calculate the amounts of reactants or products in a chemical process. Stoichiometry was first established by Jeremias Benjaim Richter in 1792 as the science of calculating the amounts or mass ratios of chemical elements.

The proportions of variations in the concentrations of species that are interacting chemically are the subject of stoichiometry. Because they contain information about which substances are connected to one another through reactions, their proportions also reveal the topological structure of reaction networks.

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Answer:Intermolecular forces

Explanation:See in a molecule these intermolecular forces hold the atoms together which decides the rigidity of the material.

I hope the answer was helpful

Answer:

2) It can be performed in natural settings

Answer:

1 moles

Explanation:

The answer is 0.0011897028836018. We assume you are converting between moles CuNo3 and gram. You can view more details on each measurement unit: molecular weight of CuNo3 or grams The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CuNo3, or 840.546 grams.

Answer:

tác dụng với acid,

Explanation:

The amount of heat that must be withdrawn from the unit per mole of feed is 312.58 kJ.

To calculate the amount of heat that must be withdrawn, we need to determine the enthalpy change for each component in the process. The enthalpy change can be calculated using the heat capacities and temperature differences.

First, we need to calculate the enthalpy change for the combustion of the synthesis gas. The reaction can be represented as:

CO + 0.5O₂ + 1.5N₂ + 2H₂ → CO₂ + 1.5N₂ + H₂O

The enthalpy change for this reaction can be calculated using the heat of formation values for the compounds involved. In this case, we assume the heat of formation values are constant and independent of temperature.

Next, we calculate the enthalpy change for the combustion of the excess air. The reaction can be represented as:

1.2O₂ + 3.6N₂ → 3.6N₂

Again, we use the heat of formation values to calculate the enthalpy change.

Finally, we subtract the enthalpy change for the combustion of the excess air from the enthalpy change for the combustion of the synthesis gas to determine the net enthalpy change for the process.

The enthalpy change for the synthesis gas combustion is 1969.68 kJ/mol, and the enthalpy change for the excess air combustion is -1776.76 kJ/mol.

Therefore, the net enthalpy change per mole of feed is 1969.68 kJ/mol - 1776.76 kJ/mol = 192.92 kJ/mol.

Since 40% excess air is used, the net enthalpy change per mole of feed is multiplied by 0.4 to account for the excess air: 0.4 * 192.92 kJ/mol = 77.17 kJ/mol.

The amount of heat that must be withdrawn from the unit per mole of feed is 77.17 kJ/mol, or approximately 312.58 kJ when rounded to two decimal places.

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Magnesium is not a compound

Blocking calcium influx into the axon terminal can have several effects on neuronal communication and neurotransmitter release.

Calcium influx into the axon terminal is a key step in the process of neurotransmitter release. When an action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium channels, allowing calcium ions to flow into the terminal. The increase in intracellular calcium concentration triggers the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, and the subsequent release of the neurotransmitters into the synaptic cleft.

If calcium influx into the axon terminal is blocked, neurotransmitter release is inhibited or reduced. This can lead to a variety of effects, depending on the specific neurotransmitter and the location of the synapse. For example:

- Inhibition of excitatory neurotransmitter release could reduce synaptic transmission and decrease neuronal activity.
- Inhibition of inhibitory neurotransmitter release could increase synaptic transmission and increase neuronal activity.
- Inhibition of neurotransmitter release at neuromuscular junctions could lead to muscle weakness or paralysis.

Calcium channel blockers are a class of drugs that can be used to block calcium influx into axon terminals and reduce neurotransmitter release. These drugs are used to treat a variety of conditions, including high blood pressure, angina, and arrhythmias.

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The mystery element that remains solid at room temperature and also breaks very easily is a :  Non-metal  ( B )

A non metal is non conducting element at room temperature, which can be in gas, sold and liquid forms at room temperature, when in solid form they can break easily and do not bend as well. Non-metals are poor conductors of heat and electricity therefore will not conduct electricity when placed in a circuit. An example of a solid non-metal is Carbon.

Hence we can conclude that the mystery element is a Non-metal

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No, it is not a scientific claim. If a ghost hunter catches a voice on video like ghost hunters do you can either believe it or not. Ghosts are more of a  i believe it you dont have to type of thing becasue they have not been scientifically proven to exist.

Answer:

prolly chickens

Answer:

Explanation:

Hope it helps:)

The concentration of the HF solution is  0.03.

We know that the concentration has to do with the amount of the substance that is present in the system. We know that what we have is an acid hence we can only talk about the concentration of the acid if we can obtain the amount of the hydrogen ion.

We know that the acid is defined as any substance in which there is the presence of the hydrogen ion is what we call and acid. Since the hydrogen fluoride does have the hydrogen, we can say that the substance that we are dealing with here is an acid.

Thus;

pH = 14 - pOH

pOH = hydroxide ion concentration

pH = hydrogen ion concentration

pH = 14 - 12.5

= 1.5

[HF]  = Antilog (-1.5)

= 0.03

The acid would have a concentration of  0.03.

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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.

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Answer:

b. the development of new vaccine prevents disease from spreading

Answer:

Explanation:

The balanced equation says that we'll get 1 mole of H2 for every 1 mole of Mg.  50 grams of H is 50g/2 g/mole = 25 moles of H2.  That means we'll need 25 moles of Mg.  Convert that into grams:  (25 moles Mg)*(24.3 g/mole) = 607 grams Mg.  

At STP, all gases occupy 22.4 liters/miole.  That means 25 moles of H2 would occupy (25 moles)*(22.4 liters/mole) = 560 liters.

The initial temperature of the water in the calorimeter was approximately 49.912°C.

To find the initial temperature of the water in the calorimeter, we will use the heat transfer equation, which states that the heat gained by the cooler substance equals the heat lost by the warmer substance.

Q_lost = Q_gained
Here, Q represents heat transfer, and we will use the formula Q = mcΔT, where m is mass, c is specific heat capacity, and ΔT is the change in temperature.
For water, the specific heat capacity (c) is 4.18 J/g°C, and for copper, it's 0.385 J/g°C.
Let's denote the initial temperature of water as Tw_initial.
For water, mass (m) is 30 grams, and ΔT = (52 - Tw_initial) °C.
For the 10 gram piece of copper, m = 10 grams, and ΔT = (120 - 52) °C.
Now, let's equate the heat lost by copper and the heat gained by water:
Q_lost (copper) = Q_gained (water)
(10 grams) × (0.385 J/g°C) × (120 - 52) °C = (30 grams) × (4.18 J/g°C) × (52 - Tw_initial) °C
3.85 J × 68 °C = 125.4 J × (52 - Tw_initial) °C
261.8 J = 125.4 J × (52 - Tw_initial)
Divide both sides by 125.4 J:
2.088 = 52 - Tw_initial
Now, add Tw_initial to both sides and subtract 2.088:
Tw_initial = 52 - 2.088
Tw_initial ≈ 49.912 °C

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Answer: Pure substances are substances that are made up of only one kind of particle and have a fixed or constant structure.

Hope this helps! :)

(a) Corrosion Penetration Rate (CPR) is a measurement of the thickness of a material's corrosion layer in terms of linear millimeters per year. Corrosion Penetration Rate is an important parameter that is widely used in the corrosion field to estimate the corrosion rate of a metal.

The penetration rate is determined by exposing a metal sample to the corrosive environment and measuring the quantity of metal that has been lost due to corrosion over a certain period of time. The formula used to calculate CPR is: CPR = Weight loss of the sample (mg) x 31556926.0 / A x D x t Where, A= Surface area of the sample (m²), D= Density of the sample (g/cm³), t= Exposure time in seconds

(b)Deterioration mechanism of polymetric materials:

(i) Thermal degradation: It is the process in which chemical decomposition occurs when a polymer is exposed to elevated temperatures, which can result in the loss of essential properties of the polymer.

(ii) Weathering: The process by which a polymer's structure and properties are altered as a result of exposure to the natural elements is referred to as weathering.

(c) Consequences of corrosion:

(i) Riveting a steel plate with copper rivets: When riveting a steel plate with copper rivets, galvanic corrosion is caused as a result of the contact between copper and steel. The steel will corrode more quickly than it would if it were in contact with a material that is less reactive than copper.

(ii) Connecting buried steel pipework to zinc plates: Connecting buried steel pipework to zinc plates can cause galvanic corrosion. Because zinc is more reactive than steel, the zinc plate corrodes and prevents the steel pipe from corroding. As a result, the zinc plate will corrode away, leaving the steel pipe vulnerable to corrosion.

(d) One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Nid'ions, other half is a cadmium electrode immersed in a Cda solution. If the cell is a standard one:

(i) Spontaneous overall reaction: Ni(s) + Cd²⁺ (aq) → Cd(s) + Ni²⁺ (aq)

(ii) The voltage generated by the cell is: E°cell = E°cathode - E°anode

E°cell = E°Cd - E°Ni

E°cell = (-0.40) - (-0.25)

E°cell = -0.15V

Therefore, the voltage generated by the cell is -0.15V.

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Answer:

two transitions elements are iron and cobalt

The estimated heat capacity for a material at 56 K is approximately 1.58 J/mol-K, and at 495 K is approximately 3.47 J/mol-K, using the Debye model.

To estimate the heat capacity at a temperature T, we can use the Debye model:

Cv = 9Nk(θD/T)³ ∫\(0^{(\theta D/T)\) (\(x^4 e^x\) / (\(e^x\) - 1)²) dx

where N is the number of atoms per mole, k is Boltzmann's constant, θD is the Debye temperature, and x is a dimensionless variable (x = hν/kT, where h is Planck's constant and ν is the frequency of the vibration mode).

(a) To estimate the heat capacity at 56 K, we can use the same formula with T = 56 K:

Cv = 9Nk(θD/T)³ ∫\(0^{(\theta D/T)\) (\(x^4 e^x\) / (\(e^x\) - 1)²) dx

= 9Nk(303 K/56 K)³ ∫\(0^{(303 K/56 K)}\) (\(x^4 e^x\) / (\(e^x\) - 1)²) dx

≈ 1.58 J/mol-K

Therefore, the estimated heat capacity at 56 K is approximately 1.58 J/mol-K

(b) To estimate the heat capacity at 495 K, we can again use the same formula with T = 495 K:

Cv = 9Nk(θD/T)³ ∫\(0^{(\theta D/T)}\) (\(x^4 e^x\) / (\(e^x\) - 1)²) dx

= 9Nk(303 K/495 K)³ ∫\(0^{(303 K/495 K)}\) (\(x^4 e^x\) / (\(e^x\) - 1)²) dx

≈ 3.47 J/mol-K

Therefore, the estimated heat capacity at 495 K is approximately 3.47 J/mol-K.

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The balanced cell reaction equation is;

Zn(s) + Pb^2+(aq) ----->Zn^2+(aq) + Pb(s)

An electrochemical cell's balanced oxidation and reduction half-reactions are represented by a chemical equation known as a balanced cell reaction equation. In other words, it illustrates the chemistry occurring at the anode and cathode of the cell.

We can see that in the cell that we have in the question, the anode is the zinc half cell while the cathode is the lead half cell. Thus electron is lost in the zinc half cell and gained in the lead half cell.

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Answer:

According to the graph, during year 14, revenue from online ads is approximately $4.2 million, while revenue from online ads has more than doubled revenue from printed ads (at least by year 14)

Both curves intersect between the seventh and eighth year, I would say around the middle of year 7, and both online ads and printed ads generated an approximate revenue of $2.2 million each

Explanation:

Explanation:

In a normal heart, there is a balance between calcium and potassium ion levels in both the outer and inner walls of the heart. That balance keeps electrical energy flowing correctly through the heart, and allows the heart muscle to expand and contract as the heart beats.10-Nov-2005

https://www.

Answer:

The correct answer is A

Explanation:

A radio telescope is used to detect, collect and focus radio waves from distant objects in the sky or space. While a compound telescope, by design, can both refract and reflect waves. A reflection telescope uses curved mirrors to reflect light to form an image. A refraction telescope forms an image using a lens as its objective.

From the above definitions, it can be deduced that option A is the correct answer.

Answer:

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water.

Explanation:

The solution is the result of the mixture between the solute, which is the substance that dissolves, and the solvent, which is the substance in which a solute dissolves. That is, a solution (or solution) is a mixture of two or more components, perfectly homogeneous since each component is intimately mixed with the other.

The concentration of solutions is the amount of solute contained in a given amount of solvent or solution. A unit of concentration is the percent weight to volume.

The percent weight to volume is the percentage ratio between the weight of the solute and the volume of the solution. It is calculated as:

\(Percent =\frac{mass of solute}{volume of solution} *100\)

Mass is measured in grams, while volume is measured in mL.

In this case:

Replacing:

\(6=\frac{12 g}{volume of solution} *100\)

Solving:

volume of solution*6= 12 g*100

\(volume of solution=\frac{12 g}{6} *100\)

volume of solution= 200 mL

200 mL of water is needed to make up a 6.00% (m/v) solution of copper (II) sulphate when 12.0 g of it will be added to water