What is the most appropriate unit of astronomical distance to represent the distance between an earth an orbiting space station and neptune?

Bases are named like ionic compounds.

Bases are named using the following convention:

Bases are substances that can accept protons (H+) or donate pairs of electrons. They typically consist of a metal cation and a hydroxide anion (OH-). When naming bases, the name of the metal cation is written first, followed by the word "hydroxide."

For example:

Sodium hydroxide: NaOH

Calcium hydroxide: Ca(OH)2

Potassium hydroxide: KOH

In these examples, the metal cations (sodium, calcium, and potassium) are named first, followed by the word "hydroxide," which represents the hydroxide anion (OH-). The resulting compounds are ionic in nature.

Learn more about bases  at

https://brainly.com/question/9836972

#SPJ6

Answer:

It is a obsessive eating disorder. Where one eats over the average amount and then makes themselves vomit. This is called purging. It is one of 3 main eating disorders. It is a very complex and misunderstood disease. One typically confuses it with binge eating or anorexia.

Answer:

axon

Explanation:

Axon is a thin fiber that carries signals away from the cell body. It is an extension responsible for transmitting signals to other cells, such as another neuron, glands or muscles. It is characterized by being longer than dendrites and can reach up to one meter in length in some species. In some neurons, the axon myelin sheath is observed, which is produced by two types of glial cells: the oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system.

Now we will calculate the number of atoms on both sides of reagent and product side of the equation.
C4H10+O2→CO2+H2O
C=ll4 atoms on left; l1 atom on right
H=l10 atoms on left; 2 atoms on right
O=lll2 atoms on left; 3 atoms on right

Put 1 in front of C4H10

Now that you've done that you can start to balance the carbon atoms, placing number 4 before CO2.
1C4H10+O2→4CO2+H2O
lC=l4 atoms on left; m4 atoms on right
lH=10 atoms on left; ll2 atoms on right
lO=l2 atoms on left; lll9 atoms on right

Balance H atoms by placing a 5 in front of H2O.
1C4H10+O2→4CO2+5H2O
lC=l4 atoms on left; m4 atoms on right
lH=10 atoms on left; l10 atoms on right
lO=l2 atoms on left; ll13 atoms on right

Now you need to balance the O atoms by putting 6.5 before O2.
1C4H10+6.5O2→4CO2+5H2O
lC=l4 atoms on left; 4 atoms on right
lH = 10 atoms on left; 10 atoms on right
lO =l13 atoms on left; 13 atoms on right

To get rid of the fractions, multiply all coefficients by 2.
2C4H10+13O2→8CO2+10H2O
lC=8 atoms on left; ll8 atoms on right
H=20 atoms on left; 20 atoms on right
O=26 atoms on left; 26 atoms on right

The complete balanced equation for the following reaction C4H10 + O2 yields CO2 + H2O is....

2C4H10+13O2→8CO2+10H2O

Good luck~ Sans

Answer : The balanced chemical reaction will be,

[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

The coefficient tell us about that how many molecules or atoms present in the chemical equation.

The given chemical reaction is,

[tex]C_4H_{10}+O_2\rightarrow CO_2+H_2O[/tex]

This reaction is an unbalanced chemical reaction because in this reaction number of carbon, hydrogen and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' is put before the [tex]C_4H_{10}[/tex], coefficient '13' is put before the [tex]O_2[/tex], coefficient '8' is put before the [tex]CO_2[/tex] and coefficient '10' is put before the [tex]H_2O[/tex] and we get the balanced chemical equation.

The balanced chemical reaction will be,

[tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]

Answer: B. The electrode at which a reduction reaction occurs.

Explanation: I just took the quiz (A P E X)

Cathode is the electrode at which a reduction reaction occurs.

What is Cathode ?
Cathode is the electrode which occurs at reduction and current enters the cell. Cathode attracts cations. Cathode means negative side.

Now check options one by one

Option (A): The electrode not releasers ions into the solutions because here positive ions gains electrons not lose electrons.

So option (A) is incorrect.

Option (B): The electrode at which a reduction reaction occur and current enter in the cell.

So it is correct answer.

Option (C): The electrode that is oxidized in a redox reaction is anode not cathode.

So it is incorrect answer.

Option (D): Anode is the electrode which loses the electrons.

So, option (D) is incorrect.

Thus, we can say that Cathode is the electrode at which a reduction reaction occurs.

Learn more about Cathode here: https://brainly.com/question/13072489

#SPJ2

Answer:

surface tension

Explanation:

The final temperature of the calorimeter is 85.71 degree C.

Heat of the reaction is -1235 kJ/mol

Heat discharged at the time of reaction is 1235 kJ/mol

The moles of ethanol are calculated by using the formula mass of ethanol / molar mass of ethanol

= 12.8 g / 46 g/mol = 0.278 moles

Thus, the no. of moles of ethanol is 0.278 moles

The heat released when ethanol is combusted is:

0.278 moles × 1235 kJ/mol = 343 kJ

The final temperature is determined as,

343 kJ = (heat capacity) (temperature difference)

343 kJ = 5.65 (T - 25)

T-25 = 343 / 5.65

T-25 = 60.71

T = 85.71 degree C

Thus, the final temperature is 85.71 degree C.

The final temperature of the system is 85.8°C.

We have the following information from the question;

Mass of ethanol = 12.8 g

Molar mass of ethanol= 46.07 g/mol

Heat of reaction= -1235 KJ/mol

Number of moles = 12.8 g/46.07 g/mol = 0.278 moles

Heat absorbed by calorimeter = number of moles × Heat of reaction =

0.278 moles × -1235 KJ/mol = -343.33 KJ

Given that;

Energy absorbed by the calorimeter = heat capacity × temperature rise

343.33 =  5.65 × (T2 - 25)

343.33 = 5.65T2 - 141.25

343.33 + 141.25 = 5.65T2

T2 = 343.33 + 141.25/5.65

T2 = 85.8°C

Learn more: https://brainly.com/question/11969651

Answer:

paramagnetic

Explanation:

Paramagnetic are those which has unpaired electrons and diamagnetic are those in which all electrons are paired.

Given the atomic number - 73

The electronic configuration is -

[tex]1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}5s^25p^64f^{14}5d^36s^2[/tex]

The electrons in 5d orbital = 3

These 3 will be unpaired as electrons are first singly filled.

Thus, the element is paramagnetic as the electrons are unpaired.

Explanation:

Sodium has atomic number of 11 with electronic configuration of :

[tex][Na]=1s^22s^22p63s^1[/tex]

Sodium loose it single electron to attain stability of noble gas configuration. While this process electron gets removed from the outer shell of the sodium atom and it gains positive charge of +1.

[tex][Na^+]=1s^22s^22p63s^0[/tex]

[tex]Na\rightarrow Na^++e^-[/tex] (Ionization)

Answer: The positive and negative charges of the water molecule pull on the negative and positive ends of the ionic molecule to break them apart.

Explanation:  

Ionic compounds dissolve in polar solvents such as water as like dissolves like. Ionic compounds are made up of ions which remain attracted by coloumbic forces.  

Thus to separate the ions, the positive and negative charges of polar solvent pulls the opposite charges of the ionic compounds and thus break them apart. Thus the ionic compounds dissolve in water.

To determine the mass of 5.6 moles of C6H6, calculate the molar mass of benzene (78.108 g/mol) and multiply it by the number of moles, resulting in 437.405 grams.

To calculate the mass of 5.6 moles of C6H6 (benzene), we start with determining the molar mass of C6H6. We do this by adding the molar masses of all the atoms present in the molecule:

Adding these together gives us the molar mass of C6H6: 72.06 g/mol + 6.048 g/mol = 78.108 g/mol.

Now, to find the number of grams in 5.6 moles of C6H6, we use the following calculation:

5.6 moles x 78.108 g/mol = 437.405 g

Therefore, 5.6 moles of C6H6 weigh 437.405 grams.

Answer:

Its C2H2

Explanation: ON EASTSIDE IT IS

Final answer:

The breaking down of NaCl into Na and Cl₂ appears to be a decomposition reaction, but the provided materials suggest an electrolysis process, where NaCl and water produce NaOH, hydrogen gas, and chlorine gas through electrolysis.

Explanation:

The reaction of sodium chloride (NaCl) breaking down into sodium (Na) and chlorine gas (Cl₂) is a type of chemical reaction known as a decomposition reaction. However, in the provided materials, NaCl doesn't appear to be converted directly to Na and Cl₂; instead, more information suggests the involvement of water (H₂O), which means the reaction discussed seems to be electrolysis, where 2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + H₂(g) + Cl₂(g). This is a redox process wherein Na is reduced and Cl is oxidized. The synthesis reaction given in the materials where 2 Na(s) + Cl₂(g) → 2 NaCl(s) is more of a combination reaction.

Answer: -

A. An uncontrolled nuclear chain reaction is most likely to multiply exponentially.

Explanation: -

An nuclear chain reaction produces neutrons. These neutrons then can start new nuclear fissions. In a controlled nuclear fission, the number of neutrons allowed to start new fission is controlled.

In an uncontrolled reaction, the neutrons start fission very fast. These also start new nuclear fission, releasing more neutrons.

Thus. An uncontrolled nuclear chain reaction is most likely to multiply exponentially.

Answer:A

Explanation:

The oxidation number of Nitrogen in HNO2 is +3. This is determined using the fact that oxygen has an oxidation number of -2, and hydrogen has an oxidation number of +1 in the compound.

The oxidation number of Nitrogen in HNO2 (nitrous acid) is +3. When determining oxidation states, we use the rule that oxygen normally has an oxidation number of -2. Since there are two oxygen atoms in nitrous acid, their combined oxidation number is -4. Knowing hydrogen has an oxidation number of +1, we can set up an equation to find the oxidation state of nitrogen (N) in HNO2. Let x represent the oxidation number of nitrogen:

H (+1) + N (x) + 2 O (-2 each) = 0 (since the compound is neutral)

1 + x - 4 = 0

x - 3 = 0

x = +3

Therefore, the oxidation number of nitrogen in HNO2 is +3, which corresponds to one of the given options.

Perform regular water changes and maintain a clean tank environment to reduce the toxin level in the fish below 750 μg/L.

To continue to reduce the toxin level in the fish below 750 μg/L, one option is to perform a water change in the tank. By regularly replacing a portion of the tank water with clean, toxin-free water, the overall concentration of the toxin in the tank will decrease, which can then help lower the toxin level in the fish's cells. Another option is to use activated carbon or other filtration systems in the tank to absorb the toxin from the water.

Besides these actions, it's crucial to monitor and ensure the water in the tank remains clean. This includes maintaining proper filtration, regular water testing, and addressing any sources of contamination. By preventing recontamination and providing a clean environment, the toxin level in the fish can be further reduced.

In summary, to continue reducing the toxin level in the fish below 750 μg/L, performing regular water changes and maintaining a clean tank environment are essential steps.

https://brainly.com/question/32478139

#SPJ12

Final answer:

Tert-butyl iodide reacts faster than tert-butyl chloride in SN1 hydrolysis due to iodide being a better leaving group.

Explanation:

Among the given options, tert-butyl iodide would undergo SN1 hydrolysis faster than tert-butyl chloride. This is because the rate-determining step of an SN1 reaction is the formation of a carbocation. Tert-butyl iodide and tert-butyl chloride both form the same stable tert-butyl carbocation when the leaving group departs. However, iodide is a better leaving group than chloride due to its larger size and weaker bond strength, which facilitates the formation of the carbocation.

Answer:

The correct answer is option B.

Explanation:

[tex]3NaOH+2NBr_3\rightarrow 3HOBr+3NaBr+N_2[/tex]

Moles of [tex]NBr_3[/tex] = 40 mol

Moles of NaOH = 48 mol

According to reaction, 3 moles of NaOH reacts with 2 moles [tex]NBr_3[/tex]

Then ,48 moles of NaOH will reacts with:

[tex]\frac{2}{3}\times 48 mol=32 mol[/tex] of [tex]NBr_3[/tex]

Then ,40 moles of [tex]NaBr_3[/tex] will reacts with:

[tex]\frac{3}{2}\times 40 mol=60 mol[/tex] of NaOH

As we can see that 48 moles of sodium will completey react with 32 moles of nitrogen tribromide.

Moles left after reaction = 40 mol - 32 mol = 8 mol

Hence, the [tex]NBr_3[/tex] is an excessive reagent.

Answer : The correct option is (B) [tex]NBr_3[/tex]

Solution : Given,

Moles of [tex]NBr_3[/tex] = 40 mol

Moles of [tex]NaOH[/tex] = 48 mol

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

[tex]2NBr_3+3NaOH\rightarrow N_2+3NaBr+3HOBr[/tex]

From the balanced reaction we conclude that

As, 3 mole of [tex]NaOH[/tex] react with 2 mole of [tex]NBr_3[/tex]

So, 48 moles of [tex]NaOH[/tex] react with [tex]\frac{48}{3}\times 2=32[/tex] moles of [tex]NBr_3[/tex]

From this we conclude that, [tex]NBr_3[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]NaOH[/tex] is a limiting reagent and it limits the formation of product.

Excess moles of [tex]NBr_3[/tex] = 40 - 32 = 8 moles

Hence, the correct option is (B) [tex]NBr_3[/tex]

Answer: The correct option is b.

Explanation: Chemical reaction is a reaction i which the chemical composition of the reactants gets changed and new substances having different chemical composition is formed. This reaction cannot be reversed by any physical means.

Indicators showing chemical changes are :

From the given information above, it can be stated that the correct option is b.

Final answer:

The incorrect statement about chemical changes is that they can be reversed by physical changes. Chemical changes result in new substances with different properties and typically require chemical reactions to reverse.

Explanation:

The statement that is not true about chemical changes is: b. They can be reversed by physical changes. Chemical changes involve a transformation where new substances are formed, typically through the breaking and forming of chemical bonds. This process is known as a chemical reaction. Unlike physical changes, which only alter the appearance or state of a substance without changing its composition, chemical changes result in new products with entirely different properties from their starting materials.

To illustrate, when hydrogen and oxygen react to form water, this is a chemical change because it results in the formation of a new substance, water, with different properties than hydrogen and oxygen gas.

Observations that indicate a chemical change has occurred include a color change, temperature change, light given off, formation of bubbles, or formation of a precipitate. Examples of these are the rusting of iron or the souring of milk. Reversing such changes generally requires chemical reactions, not mere physical processes.

Answer : Option C) Enthalpy is a state function because its change depends only on initial and final conditions.

Explanation : Enthalpy can be defined as a thermodynamic quantity which is equivalent to the total heat content of a system. It is equal to the internal energy of the system(U) plus the product of pressure and volume (PV).

E = U + PV ;

It is a state function as it only depends on the initial and final conditions, and not on the path taken to reach these reaction conditions.

Therefore, the integral of state functions can be taken using only two values: the final and initial values.

B is not the correct answer. The -3 charge is distributed over the entire ion, so the correct answer is A.

Final answer:

The correct description of the phosphate ion, PO43-, is that "it consists of one phosphorus atom and four oxygen atoms covalently bonded, with a –3 charge spread over the entire ion". The phosphorus has five valence electrons and phosphates form through covalent bonds.

Explanation:

The correct statement describing the phosphate ion, PO43-, is that it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. In a phosphate ion, the phosphorus atom is at the center with four oxygen atoms surrounding it, creating a tetrahedral shape. The charges in polyatomic ions like phosphate are not localized on a single atom but are spread over the entire ion, and these ions are formed through covalent bonds, not ionic bonds, between the phosphorus and oxygen atoms.

When calculating the charge of the phosphate ion, the valence electrons of phosphorus (which are 5) minus twice the number of oxygen atoms (4 in this case) give us the overall charge of the ion: 5 - (2 × 4) = –3. This polyatomic ion can be found in various compounds such as calcium phosphate, and Ca3(PO4)2, and is essential in biological systems and various chemical reactions.

Answer: Option (a) is the correct answer.

Explanation:

J.J. Thomson is a renowned scientist who discovered the model of atom which is known as the plum pudding model.

Through this model Thomson stated that an atom consists of small particles. These small particles are positive and negative charges present inside an atom.

Whereas Democritus stated that an atom is indivisible and thus he proposed the indivisible atom model.

Ernest Rutherford discovered that an atom has lot of empty space and this space is nucleus. As he stated that positively charged particles are known as protons which are present inside a nucleus.

Rutherford's gold foil experiment discovered that an atom has nucleus in which most of the mass of an atom is concentrated.

Thus, we can conclude that the plum pudding model was proposed as a result of J. J. Thomson’s work.