What is the acid dissociation constant for an acid at equilibrium, HX = H+ +X- ?

Answer:

For (a): The substances are known as acids and bases.

For (b): The color of the litmus for pH = 10 will be blue.

For (c): The color of the litmus for pure water will be purple.  

Explanation:

pH determines the acidity or basicity of a solution. There are three types of solution classified based on the pH:

Litmus paper is used as an indicator to know the type of solution. There are 2 types of litmus paper:

(a):

An acid is defined as the chemical species that produces hydrogen ions in the solution while a base is defined as the chemical species that produces hydroxide ions in the solution.

(b):

Given pH value = 10

The solution is basic in nature, thus the color of litmus will be blue.

(c):

Pure water is neutral in nature and has a pH of 7.

Thus, the solution of litmus would be purple.

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Answer: according to ck12.org "Heat is the sum of all the kinetic energies of all the molecules of an object, while temperature is the average kinetic energy of the molecules of an object."

Explanation:

I hope this helped!

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Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

Answer:

There are 5 steps/rules of the ideal gases based on kinetic theory.

Explanation:

1. Particles in a gas are constant moving in random motion.

2. combined volume of the particles is negligible.

3. particles exert no forces on one another

4. any collisions between the particles are completely elastic

5. the average kinetic energy of particles is proportional to temperature in kelvins.

(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)

Answer:

FOr question 5, the answer is 80 gramas.

Explanation: According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

(Will come back later for edits)

According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

The graph shows the solubility curve of an unknown salt. The four points on the diagram represent four solutions of the unknown salt.The ratio of a constituent's abundance to the total volume of a mixture is called concentration. Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.

Salt in freshwater is less than that in salt water, and the concentration of salt in the Dead Sea is greater than the concentration of salt in the oceans. The Dead Sea has a salinity of 33.7 percent, and the second-saltiest lake in the world is the Dead Sea.

Therefore, According to the graph, when the salt is being dissolved in 100 ml of water at 90 degrees 40 grams had been dissolved. If you double the amount of water, the amount of solubility will also increase.

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Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

Answer:

Use friction

Explanation:

Friction is the force that stops something in motion. It also heats up something, creating a gravitational heat! A match striked against the lighter will create a flame, because of friction :)

Answer:

94 moles of Carbon

Explanation:

From the question,

Using Avogadro's constant

1  mole of every element contains 6.03×10²³ atoms of the element

If 1 mole of Carbon contains 6.03×10²³ atoms of Carbon,

Then, x mole of Carbon will contain 5.67×10²⁵ atoms of Carbon

1 mole of C ⇒ 6.03×10²³ atoms of C

x mole of C ⇒ 5.67×10²⁵ atoms of C

solve for x

x = (1× 5.67×10²⁵)/6.03×10²³

x = 94.03 moles of Carbon

x ≈ 94 moles of Carbon

Answer:

400ml

Explanation:

Answer:

the acid used to neutralize the base in oder to form a salt and water

Answer:

1375 J/kg.°C

Explanation:

From the question First question,

Q = cm(Δt)................... Equation 1

Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.

make c the subject of the equation

c = Q/mΔt.................. Equation 2

Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C

Substitite these values into equation 2

c = -5500/[0.2×(-20)]

c = -5500/-4

c = 1375 J/kg.°C

Answer:

amylase

Explanation:

Answer:

a) pH = 13.447

b) pH = 13.176

Explanation:

Ba (OH)₂ is a strong base and ionizes completely in solution to give barium amend hydroxide ions.

The equation of the dissociation of Ba(OH)₂ is given below:

Ba(OH)₂ ----> Ba2+ + 2OH-

1 mole of Ba(OH)₂ produces 2 Moles of OH- ions

a) Before the addition of HCl, i.e.,when 0.00 mL of HCl has been added;

Concentration of hydroxide ions, [OH-] = 0.140 x 2 = 0.a) [OH-] = 0.100 x 2 = 0.280

pOH = -log [OH-]

pOH = -log (0.280)

pOH = 0.553

pH = 14 - 0.553= 13.447

b) pH when 15.0 mL HCl has been added

Moles Ba(OH)₂ = concentration × volume

Volume of Ba(OH)₂ = 82.0 mL = 0.082 L, concentration = 0.140 M

moles of Ba(OH)₂ = 0.082 x 0.140 = 0.01148 moles

moles OH- produced by 0.01148 moles of Ba(OH)₂ = 2 x 0.01148= 0.02296

moles HCl = 0.0150 L x 0.560 = 0.0084

moles of H+ produced by 0.0084 HCl = 0.0084

0.0084 H+ willnreact with 0.0084 moles of OH-

moles OH- left after the reaction = 0.02296 - 0.0084 = 0.01456 moles

total volume of new solution = (82 +15) mL = 97 mL => 0.097 L

Concentration of OH- ions = moles / volume

[OH-] = 0.01456 / 0.097 = 0.1501

pOH = -log [OH-]

pOH = -log (0.150)

pOH = 0.824

pH = 14 - 0.824

pH = 13.176

Answer:

V₂ = 2.0 Liters at STP conditions

Explanation:

Solving problem using the combined gas law

Given:

Case I Conditions           Cast II Conditions

P₁ = 825mmHg                P₂ = 760mm

V₁ = 2.30 Liters                V₂ =  ?  

T₁ = 70°C + 273 = 343K    T₂ = 0°C = 273K                  

Substitute into combined gas law assuming moles of gas remains constant; solve for unknown volume under case 2 conditions

P₁·V₁/n₁·T₁ = P₂·V₂/n₂T₂ => V₂ = P₁·V₁·T₂ / P₂·T₁  => note: in this solution, moles of gas remains constant as is disregarded in final calculation.

V₂ = (825mm)(2.3L)(273K) / (760mm)(343K) = 1.987 Liters (calculator answer) ≅ 1.9 Liters (2 sig figs based on given volume (V₁)

V₂ = 1.987 Liters ≅ 2.0 Liters (2 sig figs based on given volume (V₁)                    

The statement which best defines the theoretical yield of a reaction is the maximum amount of product that can be obtained.

Yield of any chemical reaction gives idea about the amount of product that will be produced by the chemical reaction between reactants.

Theoretical yield gives idea about the how much maximum yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.

Hence theoretical yield is the maximum amount of product that can be obtained.

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Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

Answer:

D.   Magnetometer

Explanation:

A magnetometer is a device that measures magnetic field or magnetic dipole moment. Some magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location.

What are the answers? I assume you meant to attach a photo.

Answer:

Thus, the one that is an example of mimicry that enables prey species to avoid predation is a harmless organism imitating the look of a harmful one (option B).

Explanation:

Answer:

The correct answer on edge for 2021 is C. None.

Explanation:

We know this is correct because the solution is heterogenous after it has been stirred: the substance is not soluble in water.

The solution is heterogeneous after it has been stirred. The cornstarch is not soluble in water. Therefore, option C is correct.

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

Whereas homogenous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components. A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

No matter how you sample a homogenous solution, it often has the same characteristics. Sources of water, saline solution, certain metals, and bitumen are homogenous mixes. Examples of heterogeneous combinations are chicken noodle soup, sand, and oil, and water.

Thus, option C is correct.

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Answer:

Initial temperature, T1 = 15°C

Explanation:

Given the following data;

Initial volume, V1 = 250 mL to Liters = 250/1000 = 0.25 L

Final temperature, T2 = 30°C

Final volume, V2 = 0.5 L

To find the initial temperature T1, we would use Charles' law.

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles is given by;

[tex] \frac {V}{T} = K[/tex]

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Making T1 the subject of formula, we have;

[tex] T_{1}= \frac{V_{1}}{V_{2}} * T_{2}[/tex]

Substituting into the formula, we have;

[tex] T_{1}= \frac{0.25}{0.5} * 30[/tex]

[tex] T_{1}= 0.5 * 30 [/tex]

Initial temperature, T1 = 15°C

Answer:

Location x is experiencing daytime because it is facing directly to the sun.

Explanation:

From a background understanding of the solar system, the side of the planet facing the sun will be experiencing daytime while the other side of the planet will be experiencing either partial or total darkness depending on the location.

From the diagram given above, we can see clearly that location x is facing the sun and as such, light rays from the sun lightens the location. When this happens, location x will be experiencing daytime.

In conclusion, location x is experiencing daytime because it is facing directly to the sun.

Answer:

red

Explanation:

red shows if solution is acidic

Answer:

B. A method of obtaining an emission spectrum from a sample

Explanation:

Flame test is a method of obtaining an emission spectrum from a sample.

Emission spectrum is defined as a spectrum of a chemical compound or substance composed of frequencies of electromagnetic radiation. Radiations which are emitted while electron make transition from higher to lower energy level.

Energy of photon is equal to the difference between the two energy states . There are many possible electronic transitions in an atom and every transition has a specific wavelength.Flame test is characteristic for each element as that of an emission spectrum.

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Answer:

1.5×10^4

Explanation:

Pressure= force/area

P= 600/0.04

P= 15000

P= 1.5×10^4

Answer:

53.9%

Explanation:

The equation of the reaction is;

C4H6O3+C7H6O3→C9H8O4+C2H4O2

Number of moles of salicyclic acid reacted = 88.3 g/138.121 g/mol = 0.639 moles

1 mole of salicyclic acid yields 1 mole of aspirin

0.639 moles of salicyclic acid also yields 0.639 moles of asprin

Theoretical yield of asprin = 0.639 moles * 180.158 g/mol

Theoretical yield of asprin = 115.12 g

Percent yield = Actual yield/Theoretical yield * 100/1

Percent yield = 62.0 g/115.12 g * 100

Percent yield = 53.9%