write two ionic equation to show that aluminium hydroxide is amphoteric​

Answer:

Explanation:

pH + pOH = 14

pH + 10 = 14

pH = 14 - 10 = 4

Therefore pH of the solution is 4 .

Answer:

moving

Explanation:

Earth's position is always moving in more ways than one. earth moves around the sun and it also rotates on its axis.

In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.

According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).

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Answer:

Esto se debe a que la heladera tiene mucha menor temperatura que la temperatura ambiente.

Esta menor temperatura ayuda a luchar contra los microorganismos que están en los alimentos (bacterias, hongos, etc) pues detiene en gran medida su repreduccion, la cual se ve maximizada en los rangos entre 5°C y 60°C, tal que la temperatura ambiente suele estar en el rango donde los microorganismos prosperan y se reproducen, es por ello que los alimentos se conservan mucho mejor en ambientes fríos (como la nevera) que en temperatura ambiente.

Answer:

i dont see the pic

Explanation:

Answer:

According to Gas Law

Volume is inversely proportional to pressure, if the number of particles and the temperature are constant. There are two ways for the pressure to remain the same as the volume increases.

The number of hydrogen ions, H⁺, that are there in a solution at a

the pH of  2 than in a solution at a pH of 6 is 1000 or 10⁴.

The pH of a solution is the negative logarithm in base 10 of the hydrogen ion concentration of the solution.

pH = - log [H⁺]

Hence, the hydrogen ion concentration of a solution whose pH is given is determined using the formula given below as follows:

[tex][H^{+}] = 10^{-pH}[/tex]

For the solution of pH of 2

[H⁺] = 10⁻²

[H⁺] = 0.01 M

For the solution of pH of 6

[H⁺] = 10⁻⁶

[H⁺] = 0.000001 M

The ratio of the hydrogen ion concentration of the solutions will be:

Ratio of hydrogen ions = 0.01 / 0.000001 M

Ratio of hydrogen ions = 10000 or 10⁴

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Answer:

A, B & C form the vertices of a triangle.

∠ CAB = 90°, ∠ ABC = 73° and AB = 9.4.

Calculate the length of BC rounded to 3 SF

Answer:

[tex]\huge{\textbf{\textsf{{\color{skyblue}{An}}{\blue{sw}}{\red{er}}{\color{red}{:}}}}}[/tex]

10 times 10

[tex]10 \times 10 \\ = 100[/tex]

100 is the correct answer.

Answer:

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⏩ [tex]10 \: \: times \: \: 10 \\ = 10 \times 10 \\ = 100[/tex]

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[tex] GuMiHo [/tex] ❦

Answer is option C) Have low melting points.

Explanation:

As is common knowledge, small molecules make up molecular compounds, and these small molecules are held together by an intermolecular force. The intermolecular tensions in this situation are incredibly weak and simple to overcome when breaking it. Therefore, molecular compounds have low melting and boiling points because of weak intermolecular interactions.

Chemical substances known as molecular compounds assume the shape of distinct molecules. Examples include common substances like carbon dioxide and water. These substances differ significantly from ionic substances like sodium chloride. When metal atoms give up one or more of their electrons to nonmetal atoms, ionic compounds are created. The resultant cations and anions are drawn to one another electrostatically.

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In the E2 mechanism, the rate of the reaction is affected by the strength of the bond between the leaving group and the carbon atom, as well as the stability of the resulting carbocation intermediate.

The order of the leaving groups in terms of increasing reaction rate would be:

Slowest: R-F

R-F is a relatively weak bond and the fluoride ion is a very poor leaving group, so the reaction rate would be slow.

R-Br

R-Cl

R-I

Fastest: R-I

R-I is a relatively strong bond and the iodide ion is a very good leaving group, so the reaction rate would be fastest.

R-Cl

R-Br

In short, the stability of the leaving group decreases as the atomic number of the atom increases, and the bond dissociation energy of the leaving group also decreases. So, it is Iodide>Chloride>Bromide>Fluoride.

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Answer:

P = 400 Lb/in²

Explanation:

We are given;

Weight of woman; W = 100 lb

Area beneath heel of shoe; 0.25 in²

Now, we want to find pressure.

Formula is;

P = F/A

Where;

F is force exerted by the object which is equal to weight of the object

A is area covered by object

Thus;

P = 100/0.25

P = 400 Lb/in²

Answer:

s<p<q<r

Explanation:

Given

Element s displaces p from its oxide. Thus, s is more reactive that p

p reacts with cold water  but element q cannot react with cold water. Thus,

p is more reactive than q

Element q is able to react with weak or dilute acids but element r in unable to react with weak or dilute acids. Thus, q is more reactive that r

The order of four elements on the basis of their reactivity in descending order is as follows

s<p<q<r

2.084*10^23 molecules are in 32.6 grams of potassium oxide.

A chemical's molar mass is its weight in grammes for one mole. A mole is a unit used to measure how many atoms, molecules, and ions are present in a substance. The number of molecules in a mole of any substance is 6.022 x 1023.

Although the terms "molecular mass" and "formula mass," which refer to molar mass specifically for molecular compounds, are frequently used interchangeably, their definitions vary according to the most reputable sources.

Molar mass of K2O is 94.196g

Given mass = 32.6g

1 mole of K2O = 94.196g

So, 32.6g will be 32.6/94.196g

i.e. 0.346moles

1 mole of K2O = 6.023*10^23molecules of

0.346moles will be 2.084*10^23 molecules

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The Correct answer is 50 Meters,Displacement is defined to be the change in position of an object.

Displacement is the term used to describe the shift in an object's location or the shortest path/length between two places. With such a magnitude and orientation, it is a vector quantity.

Displacement=Δx=x f −x 0

The student's path fortunately consisted of straight lines and right angles. Therefore we can use the pythagorean theorem to find the distance between where the student's path started and stopped.

A2+B2= C2.

We Give

meters east in for A, 40.

meters north for B  60 .

Distance =40+60+20=110m

Displacement OC= Root of (40 ²+30 ²)

                            = 50 m

That's the length of the distance between where the student started and where the student ended up.

A2 plus B2 equals C2. We plug 30. meters east in for A, and 40. meters north for B. 30. meters squared plus 40. meters squared equals 2500 meters2. Then we take the square root of that number and get 50. meters.

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The final molarity of bromide anion in the solution when of sodium bromide is dissolved in of a aqueous solution of silver nitrate is 0.59M

Given the mass of sodium bromide  (m) = 15.3g

Volume of aqueous solution of silver nitrate (V) = 250ml = 0.25L

Concentration of solution of silver nitrate (M1) = 0.40M

Let the final molarity of sodium bromide = M2

The volume of solution does not change when when sodium bromide is dissolved in it.

The aqueous solution of silver nitrate contains AgNO₃ ⇆ Ag⁺ +NO₃

Sodium bromide is dissociated as: NaBr ⇄ Na⁺ + Br ⁻

If we know the molecular weight of NaBr, we can directly calculate the ultimate molarity of the bromide ion (Br) from the molarity of NaBr by using the formula:

NaBr has a molecular weight of 102.89 g/mol.

So, M2 = (m/V) x 1mol of NaBr/Molec weight

= (15.3/0.25 )x 1 mol of NaBr/102.89 = 0.59mol/L = 0.59M

Hence the final molarity of bromide anion in the solution is 0.59M.

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complete question: Suppose 15.3g of sodium bromide is dissolved in 250.mL of a 0.40 M aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is dissolved in it.

Whenever the meter stick stood by itself, two forces were acting on it: some upward pressure of the fulcrum as well as the descending gravity force.

To demonstrate that the resultant force was zero when the metre stick has been in equilibrium, you must balance forces acting on it in the first section. To figure out the mass of the meter stick, you should balance the metre stick's weight against with a known weight inside the second section.

In the event that the ruler was balanced, the support which it is resting applies a force equal in strength to that of the weight's opposite force. Therefore, the ruler is being acted upon by its weight as well as the friction coefficient somewhere at support.

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A rough estimate of the excess pH of the solution is 1.74.

The answer to the question is that the concentration of NaOH is 0.2 M.

The question also states that the concentration of HNO3 is equal to that of NaOH, which is 0.2 M.

The volumes of sodium hydroxide and nitric acid that are provided to us are 50 mL and 60 mL, respectively. This implies that adding the two will result in the final volume.

= 50 plus 60 equals 110, or 0.11 liters

We know that there is a neutralizing reaction between NaOH and HNO3 based on theory. Then, as a means of answering the question, we record the aforementioned equation.

OH⁻ + H⁺ ---> H₂O

Finally, we apply logarithm to get our final answer

pH = - log [ H⁺ ]

pH = - log [0.01818]

pH = 1.74

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Sodium chloride crystal will contain 4 atoms of chlorine and 5 atoms of sodium. Therefore, option B is correct.

In sodium chloride, each ion is usually surrounded by 6 ions of the opposite charge. The surrounding ions are positioned at the vertices of a regular octahedron.

In the language of close-packing, the larger chloride ions are arranged in a cubic array whereas the smaller sodium ions fill all the cubic gaps between them.

The basic structure is commonly known as the halite or rock-salt crystal structure. It can be represented as a face-centered cubic lattice with a two-atom basis or as two face centered cubic lattices. The one atom is located at lattice point, and the second atom is located halfway between lattice points along edge of the fcc unit cell.

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Answer: Metals are malleable. Most metallic elements are solids at room temperature.​

Explanation:

Answer: all expect the first one

Explanation:

So they are luster, they are malleable they tend to lose electrons to form cation(positive ions) and they turn soild at room temperature

Answer:

2

Explanation:

The coefficient for O is 2 and this is an example of a combustion reaction. With the help of the coefficient 2 infront of oxygen, this equation now demonstrates law of conservation of mass.

The coefficient for O₂ that demonstrates the law of conservation of mass is

2.

The law of conservation of mass states that mass can neither be created

nor destroyed but can be transformed from one form to another.

The mass of the reactant and the mass of the product should be equal.

Therefore, let's balance the equation

CH4 (g) + 0₂(g) → CO₂(g) + 2H₂O(g)

For the equation to be balanced the masses of each molecules on both

sides will be the same .

Therefore,

CH4 (g) + 20₂(g) → CO₂(g) + 2H₂O(g)

The coefficient of 2 for O₂ will balance the masses of oxygen on both

sides of the chemical equation.

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Answer:

what language is this

Bulgarian?

translate into English

pH is a logarithmic scale.This implies that the acidity (H + concentration) changes by 10 times for each pH variation of one digit. For instance, a pH 4 solution contains 10 times more H + than a pH 5 solution. Since a pH 3 solution is 100 times more acidic than a pH 5 solution, it will contain 100 times more hydrogen ions (H +).

A water-based solution is described by its pH value. In general, an acidic solution is one with a small pH value, and an alkaline solution is one with a larger pH value (more basic). Since the pH scale is symmetrical around 7, a solution with a pH of 7 is completely neutral (neither acidic nor basic). Figure 1 displays a few instances of typical compounds and where they fall on the pH scale.

The concentration of hydrogen ions (H+) in a solution is directly measured by the pH value of the solution. Acids have high H+ concentrations, which results in low pH levels. There is hardly any H+ in bases. Large pH values, greater than pH 7, are present in basic liquids.

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Answer:

elements which are basic in nature or we can say that it is a metal so we conclude that it will loose electron or to form an ions

Based on the pressure information in the data table, the pressure of light and heavy particle related to the pressure of the mixed particle having same pressure and same volume.

The lighter H₂ molecules will hit the walls more frequently and with less force because they move faster and collide with them more frequently. Because both light and heavy molecules hit the walls with roughly the same average kinetic energy at the same T, their pressure and consequent volume will be equal.

As the temperature increases, the particles gain energy and accelerate their motion. The movement of heavier particles is slower than that of lighter ones at the same temperature. Both the environment and the particles' mass affect their actual average speed.

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Complete question is" Based on the pressure information in the data table, how are the pressure of light and heavy particle related to the pressure of the mixed particle?".

Thermal energy is transformed into kinetic energy that is, the energy of a moving object in this example, the moving piston by the engine. So, the sign of heat is negative and work done is negative.

A complicated device known as a combustion engine consumes fuel to produce thermal energy, which is subsequently used to drive tasks. In a car, the engine is responsible for generating the kinetic energy needed to turn the wheels. An internal combustion engine is the type of combustion engine used in automobiles. Internal-combustion engines are those found in gasoline or diesel-powered automobiles. Such an engine obtains its power from the heat produced during the combustion of the working fluids that have not yet reacted, the oxidizer-fuel mixture. As the heat is released to convert into the kinetic energy the sign of heat is negative and the sign of work done by the internal combustion of vehicles is negative.

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A compound has the empirical formula CH and is made up of carbon and hydrogen. the compound's molecular formula is C6 H6.

Compounds that involve a metal binding with a non-metal or a semi-metal will typically exhibit ionic bonding. Molecular compounds are those whose only non-metals or semi-metals contain non-metals. These compounds exhibit covalent bonding.

The compound with the lowest whole number ratio can be found in its empirical formula.

The empirical formula for weight is 12+1=13,

while the molecular formula for weight is 13 78 = 6.

The molecular formula for weight is (CH)n = (CH)6 =C6 H6.

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Thermodynamic data is data that relates to the physical properties of a system related to temperature, pressure, and energy.

What is  Thermodynamic data?

Thermodynamic data is data that describes the physical properties of a material system in terms of temperature, pressure, and other thermodynamic variables. It is used to predict the behavior of materials in different conditions and to analyze processes such as heat transfer or chemical reactions. It is also used to design and optimize energy systems, such as engines and power plants.

The standard change in entropy when one mole of sodium nitrate is dissolved in water is:

ΔS° = S° (products) - S° (reactants)

ΔS° = (60.25 + 146.4) - 116.3 = 90.3 J/K•mol

The solubility of sodium nitrate will increase if the temperature of the system is increased.

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Endothermic reaction is taking place in the reaction; as ammonium chloride and water contact, less energy is generated by breaking the bonds between the two substances.

Than what is needed to create the new substance's connections. Endothermic  reactions are those in which the reactants take in heat energy from their environment to create products. These reactions produce a cooling effect by bringing the temperature of the space around them lower. Endothermic physical processes are also possible; for example, ice cubes can melt into liquid water by absorbing heat energy from their environment (no chemical bonds are broken or formed). With the chemical formula NH4Cl, ammonium chloride is an inorganic substance that is a white, crystalline salt that is very soluble in water.

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The amount of suplher in grams to rpoduce 25.9 kJ energy= 10.95g

Here the reaction is,

S(s) + 2CO(g)  

Hrxn=-75.8 kJ energy.

Answer,

The amount of Sulpher in grams to produce 25.9 kJ energy=  xg=? 

We know that 1mole Sulpher results in the production of \ bigtri angle up Hrxn=75.8 kJ/mol energy.

25.9 kJ of energy produced from how many grams of sulpher= 25.9 kJ / 75.8 kJ/mol = 25.9g/75.8g/mol

                                                                                                                                     =0.34 mol of sulpher

The amount of 0.34 moles of sulpher in grams= Number of moles * Molar mass 

( Molar mss of Sulpher= 32.06g'/mol)

= 0.34mols * 32.06g /mol

=10.95 g

 The amount of suplher in grams to rpoduce 25.9 kJ energy= 10.95g

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