Give systematic names for the following formulas:(c) K₄[Mn(CN)₆]

Answer:

a= Covalent

b=low melting point

c= ionic

d=conduct electricity when dissolved

Explanation:

Answer:

chemical formula

Explanation:

Answer: In copper (II) sulfate pentahydrate, only 1 sulfur atom is present.

Explanation:

The chemical formula of the copper (II) sulfate pentahydrate is \(CuSO_4.5H_2O\)

In the given chemical formula:

Number of copper atoms = 1

Number of sulfur atoms = 1

Number of oxygen atoms = 9

Number of hydrogen atoms = 10

Hence, in copper (II) sulfate pentahydrate, only 1 sulfur atom is present.

Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.

Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.

The time can be represented as follows:

t= 2.303\∧ log A0/A

∧= 0.693/t 1/2

The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.

The given parameters are as follows:

t1/2=12.3

A0=5.5

A=0.688

t= 2.303/(0.693/12.3) log (5.5/0.688)

t=36.9

t=37 years

Thus, wine was produced 37 years ago (1984 as usual year 15,2021)

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The utilization of transition metal nitrides as catalyst supports offers great potential in the development of efficient and selective electrochemical CO_2 reduction systems for the production of CO/H_2 syngas, contributing to the advancement of sustainable and clean energy technologies.

Transition metal nitrides have gained significant attention as promising catalyst supports for tuning the production of CO/H_2 syngas from electrochemical CO_2 reduction. Syngas, a mixture of carbon monoxide (CO) and hydrogen (H_2), is a valuable precursor for the synthesis of various chemicals and fuels.

Transition metal nitrides, such as titanium nitride (TiN), tungsten nitride (WN), and molybdenum nitride (MoN), exhibit unique properties that make them suitable candidates for catalytic applications. These nitrides possess high thermal stability, electrical conductivity, and catalytic activity, which are essential for efficient CO_2 reduction.

By incorporating transition metal nitrides as catalyst supports, the electrochemical reduction of CO_2 can be controlled and optimized to enhance the selectivity towards CO and H_2 production. The precise tuning of the catalyst composition and morphology allows for the regulation of reaction kinetics and product distribution.

Furthermore, transition metal nitrides provide active sites for CO_2 activation and subsequent electrochemical conversion, leading to improved catalytic performance and selectivity. The unique electronic and surface properties of these nitrides facilitate the adsorption and activation of CO_2 molecules, enabling efficient conversion to CO and H_2.

Overall, The utilization of transition metal nitrides as catalyst supports offers great potential in the development of efficient and selective electrochemical CO_2 reduction systems for the production of CO/H_2 syngas, contributing to the advancement of sustainable and clean energy technologies.

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The electrochemical reduction of CO₂ is a promising approach to convert greenhouse gases into valuable chemicals and fuels, and the choice of catalyst support plays a crucial role in determining the selectivity and efficiency of the reaction.

Transition metal nitrides possess several desirable properties that make them attractive candidates as catalyst supports for CO₂ reduction. These properties include high electrical conductivity, good thermal stability, and strong metal-support interactions.

Transition metal nitrides often exhibit high surface area and tunable electronic properties, which can be beneficial for enhancing catalytic activity and selectivity.

Transition metal nitrides can effectively tune the surface chemistry and reactivity of supported metal catalysts.

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Answer:

C

Explanation:

Photosynthesis is use of light(photo---solar energy) to make(synthesize) food(chemical energy) and is done by producers(plant)

The measure of the total energy radiated by a star in one second is called luminosity.

Luminosity represents the intrinsic brightness of a star and is a measure of the total power output in terms of energy. It is an important characteristic of a star that indicates its size and temperature.

Luminosity is typically expressed in units of watts or solar luminosities (the luminosity of our Sun). Flux, on the other hand, refers to the amount of energy received per unit area per unit time, and it is influenced by the distance between the star and the observer. Apparent magnitude and absolute magnitude are measures of a star's brightness as observed from Earth and at a standard distance, respectively, and they are related to luminosity but not the direct measure of energy radiated.

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The number of valence electrons for neutral atoms is the same as the number of the atom's main group. A periodic table element's column can be used to determine its main group number. For instance, carbon, which belongs to group 4, has four valence electrons.

For an atom to become a charged ion and create an ionic connection with another atom, it must have between one and three valence electrons, which it will lose.

Atoms can be very reactive or extremely inactive depending on how many valence electrons they have. The quantity of valence electrons in an atom also affects whether or not it is more likely to lose or acquire electrons during chemical processes. Metals may carry electricity because they readily give away electrons.

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Answer:

Explanation:

The early atmosphere

Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence.

The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane. As the Earth cooled down, most of the water vapour condensed and formed the oceans.

It is thought that the atmospheres of Mars and Venus today, which contain mostly carbon dioxide, are similar to the early atmosphere of the Earth.

Scientists can’t be sure about the early atmosphere and can only draw evidence from other sources. For example, volcanoes release high quantities of carbon dioxide. Iron-based compounds are present in very old rocks that could only have formed if there was little or no oxygen at the time.

Changes in the atmosphere

So how did the proportion of carbon dioxide in the atmosphere go down, and the proportion of oxygen go up?

The proportion of oxygen went up because of photosynthesis by plants.

The proportion of carbon dioxide went down because:

it was locked up in sedimentary rocks (such as limestone) and in fossil fuels

it was absorbed by plants for photosynthesis

it dissolved in the oceans

The burning of fossil fuels is adding carbon dioxide to the atmosphere faster than it can be removed. This means that the level of carbon dioxide in the atmosphere is increasing.

Answer: 35.84

Explanation: Look at the most uncertain number and your sum should have the same number of decimal places as that. In this case it is 4.26 which as 2 numbers following the decimal point, so your answer should too.

Answer:

B

Explanation:

Ozone (O3) is a gas which is present naturally within Earth's atmosphere. It is formed of three oxygen atoms (giving it the chemical formula, O3).

1. 7.53 x 10^23 moles of neon.

2. 6.31 x 10^24 atoms of tungsten is equal to 1 mole of tungsten.

3. In 54 grams of water, there are approximately 4.5 x 10^23 atoms of hydrogen.

4. How many grams are in 12.3 moles of dinitrogen pentoxide?

5. The molar mass of carbon dioxide is 44.01 g/mol.

6. Aluminum oxide has a molar mass of 101.96 g/mol. Therefore, 0.87 moles of aluminum oxide would be 87.17 g.

7. At STP (standard temperature and pressure), 6 L of hydrogen gas contains 0.024 moles of hydrogen.

8. At STP, 10.26 moles of neon will occupy a volume of 24.03 liters.

9.

No, a human is not at risk of a reaction if they were stung with a 0.00056-gram amount of histamine. 0.00056 grams of histamine is only 8.64 x 1010 molecules, which is far less than the threshold of 3.4 x 1015 molecules necessary to cause a reaction.

10. MgS2O6

i gotchu bro here you go

The model of the atom is the electron.

Experiments with JJ Thomson's cathode ray tube showed that all atoms contain small negatively charged subatomic particles or electrons. Thomson proposed a plum pudding model of an atom in which negatively charged electrons are embedded in a positively charged soup. In 1897, Thomson discovered the electron and proposed a structural model of the atom.

His research also led to the invention of the mass spectrometer. According to Thomson's atomic model, atoms consist of positively charged spheres injected with negatively charged electrons. Since electrons and protons are the same sizes the atom is electrically neutral. Thomson discovered the electron through experiments with Crookes or cathode ray tubes. He showed that cathode rays are negatively charged. In addition, he also studied positively charged particles in neon gas.

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The molecular structures of sugars and alcohols are similar due to the presence of the -OH group.

This is a substance which has a sweet taste and is a form of simple carbohydrate.

They are however not similar due to the different numbers of Carbon atoms attached to the -OH group..

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Answer:

the copper would melt at the same temperature no matter how much quantity there is so 1085

Explanation:

Answer:

T₁ = 563.19 K

Explanation:

Given data:

Initial volume = 359 mL

Final volume = 269 mL

Final temperature = 422 K

Initial temperature = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law:

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₁ = V₁T₂ / V₂

T₁ = 359 mL × 422 K / 269 mL

T₁ = 151498 mL.K / 269 mL

T₁ = 563.19 K

Answer:

4797454.5

Explanation:

Answer:

4,797,442.5 centimeters

Explanation:

1 mile = 160,934 centimeters

29.81 * 160934

4797442.5

Best of Luck!

Answer: 0.1

Explanation: because if you divide 1/10 gives you 0.1

There are 11.6 mmol of iron in 650 mg of iron.

Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.

We need to calculate how many millimoles (mmol) are present in the given amount of iron.

We will use the following conversion:

1 g = 1000 mg

1 mol = molar mass in grams

1 mmol = 0.001 mol

Number of moles of iron

= 650 mg ÷ 1000 mg/g

= 0.65 g ÷ 55.85 g/mol

= 0.0116 mol

Number of millimoles of iron

= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron

= 11.6 mmol

Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.

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Rate of production of NO₂ = 0.2 M/s

Rate of production of O₂ = 0.05 M/s

Given

The rate of N₂O₅ : 0.1 M/s

Reaction

2N₂O₅⇒4NO₂+O₂

Required

The rate of production of NO₂ and O₂ at the same time point

Solution

Rate of disappearance of N₂O₅ = reaction rate x coefficient of N₂O₅

0.1 M/s=reaction rate x 2

reaction rate = 0.05 M/s

The rate of production of NO₂=

Rate of production of NO₂ = reaction rate x coefficient of NO₂

Rate of production of NO₂ = 0.05 M/s x 4

Rate of production of NO₂ = 0.2 M/s

The rate of production of O₂=

Rate of production of O₂ = reaction rate x coefficient of O₂

Rate of production of O₂ = 0.05 M/s x 1

Rate of production of O₂ = 0.05 M/s

Answer:

NO2 is produced at 0.2 M/s, and O2 is produced at 0.05 M/s.

Explanation:

The weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

To calculate the weight of magnesium chloride (\(MgCl_{2}\)) required to prepare a 200 ml solution that is 5.0 M, we need to use the formula: Weight (in grams) = Volume (in liters) × Concentration (in moles/liter) × Molecular Weight (in grams/mole)

First, we convert the volume from milliliters to liters by dividing it by 1000: Volume = 200 ml ÷ 1000 = 0.2 L. Next, we multiply the volume, concentration, and molecular weight: Weight = 0.2 L × 5.0 mol/L × 95.3 g/mol = 47.65 grams

Rounding to the nearest whole number, the weight of magnesium chloride required to prepare the 200 ml solution that is 5.0 M is approximately 48 grams.

This calculation ensures that the desired concentration is achieved by accurately measuring the appropriate amount of magnesium chloride, taking into account its molecular weight and the desired volume of the solution.

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Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy

Explanation:

Answer:

endothermic; the dough absorbs heat

Explanation:

EDG2020

The metal has a specific heat of 0.390 J/g°C.

What is Specific Heat ?

Specific heat is an important concept in thermodynamics and is used to determine the amount of heat required to raise the temperature of a material, or conversely, the amount of heat that is released when a material cools. Different materials have different specific heats, which means that they require different amounts of heat to change their temperature. For example, water has a very high specific heat, which means that it takes a lot of heat energy to raise its temperature, while metals have much lower specific heats and require much less heat energy to change their temperature.

We can use the formula for the heat absorbed or released by a material:

Q = m * c * ΔT

where Q is the heat absorbed or released, m is the mass of the material, c is the specific heat, and ΔT is the change in temperature.

In this case, the metal absorbs 57.2 J of heat, and the temperature of the sample rises 32°C. The mass of the metal is 4.70 g. When these values are added to the formula, we obtain:

57.2 J = 4.70 g * c * 32°C

Solving for c, we get:

c = 57.2 J / (4.70 g * 32°C)

= 0.390 J/g°C

Therefore, the specific heat of the metal is 0.390 J/g°C.

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The henry's law constant for a gas is 0.0025 m/atm. The partial pressure of the gas required to produce a 0.00688 m aqueous solution is 2.8 atm.

To find the partial pressure of the gas, we can use Henry's Law equation, which states that the concentration of a gas in a solution is directly proportional to its partial pressure. The equation is given by:
C = k * P
Where C is the concentration of the gas in the solution, k is the Henry's Law constant, and P is the partial pressure of the gas.
Rearranging the equation to solve for P:
P = C / k

Substituting the given values:
P = 0.00688 m / 0.0025 m/atm
P = 2.8 atm
Therefore, the partial pressure of the gas required to produce a 0.00688 m aqueous solution is 2.8 atm.

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According to the question there are approximately 1.68 x 10^23 atoms of sulfur in 12.5g of sulfur.

Sulfur is a non-metallic chemical element that is found in nature in both pure form and as part of minerals and metals. Its symbol on the periodic table is S and its atomic number is 16. It is an abundant, yellow, odorless, brittle solid that is insoluble in water. Sulfur is one of the oldest known elements and is found in many compounds in its native form. It is used in a variety of applications, such as in the production of sulfuric acid, in the manufacturing of rubber, in the processing of petroleum and natural gas, and in the production of pharmaceuticals.

There are approximately 1.68 x 10^23 atoms of sulfur in 12.5g of sulfur. This is because sulfur has a molar mass of 32.06 g/mol, so 12.5g of sulfur is equivalent to 0.39 moles of sulfur (12.5g/32.06g/mol). Since 1 mole of sulfur atoms contains 6.022 x 10^23 atoms, 0.39 moles of sulfur atoms contains 0.39 x 6.022 x 10^23 atoms, which is approximately 1.68 x 10^23 atoms.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass of metal = 25 g

volume = final volume of water - initial volume of water

volume = 28.5 - 25 = 3.5 mL

It's density is

\(density = \frac{25}{3.5} \\ = 7.142857...\)

We have the final answer as

Hope this helps you

Answer:

Nepal aims to achieve universal access to clean, reliable and affordable renewable energy solutions by 2030. It is expected to reduce dependence on traditional and imported energy by increasing access to renewable energy. The use of solar energy is more reliable than traditional electricity in Nepal.

According to law of conservation of energy,solar energy is a renewable source of energy as it's heat can be converted to other forms of energy  and can be conserved and is being looked as an alternative in Nepal.

According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.

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In order for a photon to excite an electron from the lower energy level to the upper energy level of a certain atom, the energy of the photon must be equal to the energy difference between the two energy levels, which in this case is 2.5 eV.

For a photon to excite an electron from the lower energy level to the upper energy level in an atom with two energy levels whose energies differ by 2.5 eV, the photon must have an energy equal to the difference between the two energy levels. In this case, the energy of the photon must be 2.5 eV.

This is because the photon's energy will be absorbed by the electron, allowing it to transition to the higher energy level.

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15.2 g of KCl are produced when 25.0 g of KClO₃ decompose.

The balanced chemical equation is:

2KClO₃ → 2KCl + 3O₂

The molar mass of KClO₃ is 122.55 g/mol, and the molar mass of KCl is 74.55 g/mol.

To find the amount of KCl produced, we need to first determine the number of moles of KClO₃ decomposed.

Number of moles of KClO₃ = mass / molar mass = 25.0 g / 122.55 g/mol = 0.204 moles

From the balanced chemical equation, 2 moles of KClO₃ produce 2 moles of KCl.

Therefore, 0.204 moles of KClO₃ produce (2/2) × 0.204 moles of KCl = 0.204 moles of KCl.

The mass of KCl produced is given by:

Mass of KCl = number of moles × molar mass = 0.204 moles × 74.55 g/mol = 15.2 g

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