Beryllium oxide is heated.
What is the chemical reaction equation?

Answer:

Atomic emission spectra are produced when excited electrons return to the ground state. When electrons return to a lower energy level, they emit energy in the form of light.

Explanation:

Answer:

Explanation:

ammonium carbonate + calcium chloride -----> ammonium chloride + calcium carbonate

(NH4)2CO3 + CaCl2 ----> NH4Cl + CaCO3

The balanced chemical equation for the given reaction is (NH₄)₂CO₃ + CaCl₂ ----> NH₄Cl + CaCO₃.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The theoretically cannot be a temperature lower than this. Based on the freezing point of water, the scales that we are accustomed to using (Celsius and Fahrenheit) were developed.

What is Charles' law ?

Charles' law asserts that a gas's volume is equal to a constant number times the temperature of that gas, as determined by the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius).

What is absolute zero?

A thermodynamic system has its lowest energy at absolute zero degrees Celsius. It is equivalent to 459.67 degrees Fahrenheit and 273.15 degrees Celsius, respectively, on the thermometer. temperatures on a scale.

Absolute zero is the temperature at which nothing moves. It serves as the absolute scale because there theoretically cannot be a temperature lower than this. Based on the freezing point of water, the scales that we are accustomed to using (Celsius and Fahrenheit) were developed.

Therefore, theoretically cannot be a temperature lower than this. Based on the freezing point of water, the scales that we are accustomed to using (Celsius and Fahrenheit) were developed.

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Answer:

15 neutrons

Explanation:

the atomic mass shows the amount of neutrons and protons added together

the atomic number shows us how many protons they are (you can also find out how many electrons a element has by looking at its atomic number as it will have the same amount of protons)

so to find the amount of neutrons the sample has you have you subtract the atomic number which is the amount of protons from the mass number which tells us the amount of neutrons and protons added together but we only need the neutrons that's why we subtract it

33-18=15

mencgapa karena aku gk bisa bahasanya

Each crew member receives three wholesome meals daily along with snacks. The food for each astronaut is kept onboard the Shuttle and is given a unique color dot to identify it.

This is further explained below.

Generally, Being bigger than only Mercury, Mars is the second-smallest planet in the Solar System and is located four planets from the Sun. The Roman god of battle is the inspiration for the name of Mars in English.

It provides each member of the crew with three meals that are well-balanced, in addition to snacks. On board the Space Shuttle is where all of the astronauts' food is kept, and each individual box has a colorful dot that identifies it.

In conclusion, For example, traveling to Mars and returning may take more than three years and need the supply of thousands of kg of food. If the crew of four were to consume merely three meals per day while on their three-year voyage to Mars, they would need to bring more than 24,000 pounds (10,886 kilograms) of food with them.

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2.58 x 10^-4 moles of sodium atoms

4.32 mol of Al

a. 55.8 g Fe

b. 451 g Ca3(PO4)2

c. 43.2 g C4H10

a. 0.215 mol CaCO3

b. 0.092 mol NH3

c. 0.10 mol Sr(NO3)2

Total carbon atoms in 0.260 mol of glucose, C6H12O6 = 9.36 x 10^22 atoms of C

Total hydrogen atoms in 0.260 mol of glucose, C6H12O6 = 1.12 x 10^23 atoms of H

Total oxygen atoms in 0.260 mol of glucose, C6H12O6 = 5.88 x 10^22 atoms of O

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Explanation:

A conservationist is someone who advocates and champions the cause to protect the environment and use earth's resource in a sustainable way.

One of the interesting perks of being a conservationist is the ability to preserve pristine nature.

Answer:

opposite

Explanation:

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Heat is transferred from the sun to the sand by radiation, from the sand to the feet by conduction, and from the feet to the water by convection.

Heat is transferred by 3 methods depending on the molecule:

Heat waves travel through the air to heat up the sand, a radiational process. Walking across the hot sand on the beach, heat from the sand will get transferred to your feet by conduction because your feet are solid.

When you place your feet into the cold beach water, a convectional current helps transfer the heat from your feet to the water.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Synthesis. Iodine monobromide is formed when iodine and bromine are combined in a chemical reaction: I2 + Br2 → 2 IBr.

The arrangement in increasing melting points would be NaI < NaBr < NaCl.

Arranging NABr, NaCl, and NaI according to their increasing melting points, we need to consider the factors that affect the strength of the ionic bonds between the cation (Na+) and the anion (Br-, Cl-, or I-).

As we move down the halogen group (from Cl to Br to I), the size of the anions increases, resulting in weaker electrostatic attractions between the ions. Therefore, the strength of the ionic bonds decreases, and the melting points generally increase.

Comparing NaBr, NaCl, and NaI, NaCl has the highest melting point. This is because Cl- ions are smaller and more closely packed than Br- and I- ions, leading to stronger ionic bonding.

Next, NaBr has a lower melting point compared to NaCl but higher than NaI. This is because Br- ions are larger than Cl- ions, resulting in weaker ionic bonding.

Finally, NaI has the lowest melting point among the three compounds due to the large size of I- ions, which results in the weakest ionic bonding.

In summary, the arrangement in increasing melting points would be NaI < NaBr < NaCl.

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The molecular formula of the compound is \(C_2H_3\).

To determine the molecular formula of the gaseous compound, we need to use the information given about its empirical formula and the time it takes to escape through a pinhole and apply the concept of the Ideal Gas Law.

The empirical formula of the compound tells us the simplest whole-number ratio of the atoms present in the molecule. In this case, the empirical formula is \(CH_2\), which means that the molecule contains one carbon atom and two hydrogen atoms.

The time it takes for gas to escape through a pinhole is related to its molar mass and the size of the hole. The lighter the gas, the faster it will escape. Therefore, we can compare the escape times of nitrogen gas and the compound to determine their relative molar masses.

Using the Ideal Gas Law, we can relate the molar mass of the compound to the time it takes to escape through the pinhole. Assuming the same conditions of temperature and pressure, the Ideal Gas Law states that PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. Rearranging this equation gives us n=m/M, where m is the mass of the gas and M is the molar mass.

We can use this equation to find the molar mass of the compound:

n = m/M

n = m/ (Empirical formula mass of \(CH_2\))

n = m/ (12.01 + 2*1.01)

n = m/ 14.03

We know that the time it takes for nitrogen gas to escape through the pinhole is 83.8 seconds, and the time for the compound is 68.4 seconds. Therefore, the ratio of their molar masses is:

(Molar mass of nitrogen gas) / (Molar mass of the compound) = (Time for the compound to escape) / (Time for nitrogen gas to escape)

(Molar mass of nitrogen gas) / (Molar mass of the compound) = 83.8 / 68.4

(Molar mass of nitrogen gas) / (Molar mass of the compound) = 1.2246

We know the molar mass of nitrogen gas is 28.01 g/mol, so we can solve for the molar mass of the compound:

28.01 / (Molar mass of the compound) = 1.2246

The molar mass of the compound = 22.87 g/mol

Now we can use the molar mass of the compound to find its molecular formula. The empirical formula mass of \(CH_2\) is 14.03 g/mol, so the molecular formula mass must be a multiple of this value that is close to 22.87 g/mol. Dividing 22.87 by 14.03 gives a value of 1.63, which suggests that the molecular formula contains approximately 1.63 times as many atoms as the empirical formula.

To find the molecular formula, we can multiply the empirical formula by this factor:

(\(CH_2\)) x 1.63 = C1.63H3.26

Rounding to the nearest whole number, we get the molecular formula \(C_2H_3\).

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Answer:

See the answer below

Explanation:

When a solution of iodine is mixed with a solution of tetrachloromethane, the mixture turns purple due to the formation of \(I_2(CCl_4)\).

Iodine solution dissolves in carbon tetrachloride solution (another name for tetrachloromethane) due to the fact that both solutions are similarly non polar in nature. The equation of the reaction is as shown below:

            \(I_2 + CCl_4 --> I_2(CCl_4)\)

Answer:  " \(1.41 * 10^{24}\) " atoms of aluminum (Al) .

____________________________________

Explanation:

_________________________

Using a technique called "dimensional analysis" ; as follows:

________________________

→  " \(\frac{2.34 mol Al}{1} * \frac{6.022*10^{23}atoms Al}{1 mol Al} = ?\)  

________________________

The units "mol Al" ["moles of aluminum"] cancel out; and we have:

________________________

→  "\([(2.34) * (6.022 * 10^{23})] = ?\) atoms of Al [aluminum].

________________________

Note that by definition: 1 (one) "mole" (abbreviated "mol") of anything consists of " \(6.022*10^{23}\) " units " of that particular thing.

 This number:  6.022*10^{23} —is known as:  "Avogadro's number".

________________________

→  [ 2.34 * 6.022 * 10^23] ;

     = 1.409148 * 10^24 ;

                → Round to 3 (Three) significant figures;

                →  since: "2.34" has 3 (Three) significant figures;

                  →  to get: " \(1.41 *10^{24}\)  atoms of aluminum (Al).

________________________

Hope this is helpful to you!  Wishing you the best!

________________________

To perform a retrosynthesis of alcohol formed by a Grignard reaction, begin by classifying the type of alcohol formed. Primary alcohols result from a Grignard reagent reacting with formaldehyde, secondary alcohols form when a Grignard reagent reacts with an aldehyde, and tertiary alcohols arise when a Grignard reagent reacts with a ketone.

Next, identify the disconnection, which is the bond formed in the Grignard reaction. Locate the carbon bonded to the hydroxy group and disconnect each alkyl group connected to this carbon. The alkyl group corresponds to the Grignard reagent, while the remaining two groups attached to the carbon were substituents on the carbonyl.

By performing a retrosynthetic analysis of the alcohol, you can determine the necessary Grignard reagent and carbonyl compound to synthesize the desired alcohol. This approach helps in planning a synthetic strategy and understanding the steps involved in forming the target alcohol using a Grignard reaction.

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The Ksp for PbCl₂ at 298 K is approximately \(1.12 \times 10^{(-5)}\).

To determine the Ksp (solubility product constant) for PbCl₂ at 298 K, we can use the Nernst equation and the standard reduction potentials of the PbCl₂/Pb and Pb²⁺/Pb couples.

The balanced half-reactions for the two couples are as follows:

PbCl₂ + 2e⁻ → Pb + 2Cl⁻

Pb²⁺ + 2e⁻ → Pb

Given that the standard reduction potentials (Eo) for the PbCl₂/Pb and Pb²⁺/Pb couples are -0.268 V and -0.126 V, respectively, we can calculate the standard cell potential (E°cell) using the equation:

E°cell = E°reduction + E°oxidation

E°cell = -0.268 V + (-0.126 V)

E°cell = -0.394 V

Now, we can use the Nernst equation to relate the cell potential to the Ksp:

Ecell = E°cell - (RT / nF) ln(Q)

Since the reaction quotient (Q) for the precipitation of PbCl2 is equal to the concentration of Pb²⁺ and Cl⁻ ions, and assuming standard conditions (T = 298 K, n = 2, and F is the Faraday constant), we can simplify the equation to:

Ecell =E°cell - (0.0592 / 2)log10(Q)

Since the reaction is at equilibrium, the cell potential (Ecell) is zero. Therefore, we can rewrite the equation as:

0 = E°cell - (0.0592 / 2) log10(Ksp)

Solving for Ksp, we have:

\(Ksp = 10^{(\frac {E^{0}cell}{\frac {0.0592}{2}})}\)

\(Ksp = 10^{(\frac {-0.394}{\frac {0.0592}{2}})}\)

Calculating this expression gives us:

Ksp ≈ \(1.12 \times 10^{(-5)}\)

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Here is an image of the EM spectrum. I hope this helps!

Answer:

Since it has 2 valence electrons

Explanation:

Fish are fascinating creatures that have adapted to survive and thrive in diverse aquatic environments, making them a crucial and captivating part of our planet's biodiversity.

Fish are a diverse group of aquatic vertebrates characterized by their ability to extract oxygen from water through gills. They possess streamlined bodies and fins that enable them to navigate and swim efficiently in their watery habitats. From small, colorful tropical fish found in coral reefs to large, predatory species like sharks, fish occupy various niches in aquatic ecosystems.

Fish exhibit a wide range of adaptations, such as camouflage, schooling behavior, and specialized feeding structures, allowing them to thrive in different environments and exploit various food sources. They play vital roles in food webs as both predators and prey, contributing to the overall balance and stability of aquatic ecosystems.

Additionally, fish have a remarkable array of colors and patterns, serving purposes such as attracting mates, warning predators, or blending into their surroundings for protection. They also display various reproductive strategies, including external and internal fertilization, live birth, and egg-laying.

Overall, fish are fascinating creatures that have adapted to survive and thrive in diverse aquatic environments, making them a crucial and captivating part of our planet's biodiversity.

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CH 3 is the empirical formula of a hydrocarbon consists of 80 by mass of carbon

The empirical formula or simplest formula gives the lowest whole number ratio of atoms that are present in a compound. This formula tells us how many atoms of each element there are in the complex.

The Process for Finding an Empirical Formula

Let's start with what the problem provides, which is the weight in grammes of each constituent.

If percentages are given, we'll assume that there are 100 grammes total, making each element's mass equal to the specified percentage.

A compound in organic chemistry with only hydrogen and carbon atoms is referred to as a hydrocarbon. Crude oil, natural gas, coal, and other significant energy sources are made of hydrocarbons, which are a naturally occurring component. When burned, they release a lot of heat, water, and carbon dioxide due to their high combustibility. So, as a fuel source, hydrocarbons are quite efficient.

Given that the percentage of carbon = 80% and hydrogen = 20%, thus the mole ratio can be calculated as;

\(\frac{80}{12} =\frac{20}{1}\)=   6 . 67  :  20 =  1 : 3

empirical formula  = CH 3,

and molecular formula of the given hydrocarbon is C 2 H 6

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​

Answer:

Flerovium

Explanation:

Answer:

Fl or flerovium. Atomic number is the number above the element on a periodic table.

Answer: 5.248

Explanation: 0.53/0.1010 = 5.24752475248, and round to the thousandths.

Answer:

The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles are in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exert pressure on the gas.

Explanation: Hope this helps!!

Answer:

128.98 g/Mol

Explanation:

ΔTb = Kb * m * i

Where;

ΔTb = boiling point elevation

Kb = boiling point constant

m = molality of the solution

i = Van't Hoff factor

Hence;

Where molality = number of moles of solute/mass of solvent in Kg

Number of moles of solute = mass/Molar mass

So;

80.61 - 80.10 = 2.53 * 13g/M/0.5 * 1

Where M is the molar mass of the solute

0.51 = 2.53 * 13g/M/0.5

0.51 = 2.53 * 13/M * 1/0.5

0.51 = 32.89/M * 1/0.5

0.51 * 0.5 = 32.89/M

0.255 M = 32.89

M = 32.89/0.255

M= 128.98 g/Mol

If some solution in one well of a cell spills over and mixes with that in the other well, it will cause contamination of the solution in the other well, and the measured cell potential will be affected.

The spill-over may change the concentrations of the reactants and products in the half-cells, causing a shift in the equilibrium of the redox reaction taking place in the cell. This shift in the equilibrium will alter the cell potential, leading to an inaccurate measurement.

Additionally, if the spilled solution is an electrolyte, it may react with the solution in the other well, resulting in the formation of additional products or reactants that were not present in the original solution.

This will also affect the measured cell potential. Therefore, it is important to be careful when handling and transporting cells to prevent such spills and contamination.

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The chart used by moseley was more accurate at predicting where new elements would be placed, because Moseley's work chart based the atomic number which is definable property, measurable through experimentation not chemical properties or atomic mass as mendeleev do.

In his periodic table, Mendeleev left some notable gaps, such as the gaps just below aluminum and silicon, which covered elements as yet to be discovered. When these elements were later discovered, the properties of the new elements were found to match Mendeleev's predictions. The main difference between Mendeleev's and Moseley's arrangement of the elements on the periodic table is that Mendeleev arranged the elements in ascending order of atomic weight, whereas Moseley arranged them in ascending order of atomic number. Moseley diagrams were based on the use of atomic numbers rather than chemical properties of the elements. The similarity of products from the same period often caused problems when creating orders. Moseley's work made it possible to change atomic number from an arbitrary choice to a definable property that can be measured through experimentation.

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"the number of ions produced by one formula unit of the electrolyte," refers to the van't Hoff factor (i) in an ideal solution of a strong electrolyte. It represents the extent of dissociation of the electrolyte into ions.

In an ideal solution of a strong electrolyte, the van't Hoff factor (i) represents the number of ions that are produced when one formula unit of the electrolyte dissociates completely in the solution. It is a measure of the extent of dissociation of the electrolyte.

For example, for a strong electrolyte such as sodium chloride (NaCl), when it dissolves in water, it completely dissociates into sodium ions (Na+) and chloride ions (Cl-). In this case, the van't Hoff factor (i) would be 2 because one formula unit of NaCl produces two ions (Na+ and Cl-).

Similarly, for other strong electrolytes, the van't Hoff factor (i) can be determined based on the number of ions produced per formula unit. It is important to note that for non-electrolytes or weak electrolytes, the van't Hoff factor (i) is typically less than 1, indicating partial dissociation or no dissociation in the solution.

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