Art a the ph of a 0. 25 m aqueous solution of hydrofluoric acid, hf, at 25. 0 °c is 2. 3. What is the value of ka for hf

Answer:

P₁V₁=P₂V₂

29.3 * 28.8 = 16.5* V₂

V₂ = 51.14 L

Answer:

they are opposite in function

Explanation:

voltaic cell converts chemical energy to electrical energy through redox reactions i.e reduction-oxidation reaction while the electrolytic cell converts chemical energy to electrical energy.

Answer:

without density, we wont be able to determine what substance will float

Answer:

yeah.. u cant only if heated the iced tea, breaking the sugar cube up has no effect on the dissolving process.

Answer:

h=5000j

change in temperature=20k

m=3kg

using C=H÷M×Change in temperature

C=5000÷3×20

C=5000÷60

C=83.33jkg-1k-1

Answer: The circulation around the Hadley cells

Explanation:

The world's deserts are typically found at 30°N and 30°S latitudes because of the circulations around the Hadley cells. Thus, the correct option is B.

Within each cell, the air moves in a circular motion. Taking the Hadley cell, the warm air at the equator (0° latitude) rises and then cools down in the upper atmosphere, and then circles back down towards the tropics of around 30° latitude.

As the air leaves equator, it rains away more moisture, becoming denser and slightly cooler in temperature, until it finally dry, sinks, and creates the arid bands where many of the world's famous deserts lie. This giant atmospheric conveyor belt, is called a Hadley cell, brings both the tropical rain forests and deserts.

Therefore, the correct option is B.

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The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.

Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:

Ka = [H⁺][A⁻] / [HA]

Chemical equation with ICE table for the acetylsalicylic acid will be shown as:

                  C₉H₈O₄(aq)  +  H₂O(l)  ⇄  C₉H₇O₄(aq)  +  H₃O⁺(aq)

Initial:                 x                                        0                     0

Change:            -a                                        +a                   +a

Equilibrium:      x-a                                      x+a                 x+a

So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:

Ka = [x+a][x+a] / [x-a]

Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:

Ka = (x+a)² / x

By knowing the all values of concentration we can calculate the value of Ka.

Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.

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The concentration of the silver nitrate solution is 1.86 moles/dm³ .

The concentration of a substance is the quantity of solute present in a given quantity of solution.

2AgNO₃(aq)+Ca(s)→Ca(NO₃)₂(aq)+2Ag(s)

0.201 g of Silver = 0.201/107.8 = 0.00186 moles

From the equation we can see that for 2 moles of Silver to form we need 2 moles of silver nitrate .

For 0.00186 moles we will need 0.00186 moles of Silver nitrate

The concentration of the solution can be determined as

Molarity = moles / L of solution = 0.00186 moles/l

or 0.00186 moles/cu.cm = 1.86 moles/dm³

Therefore the concentration of the silver nitrate solution is 1.86 moles/dm³ .

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Answer:

2

Explanation:

2 balances out the equation

Answer:

but-1-ene

Explanation:

Solving :

⇒ 4 carbon atoms (but-)

⇒ One double bond (-ene)

⇒ Bond is present on the 1st carbon atom

Hence, the IUPAC name is :

but-1-ene

Answer:

a: the hair dye

b: the change in color of her hair

c: the same amount of hair for both dyes and the same amount of dye

Explanation:

Answer:

D

Explanation:

This question is a little strange. C and D are very similar, but I would pick D.

Fluorine actually has the highest electronegativity of all the elements. This allows it to pull more electrons towards itself. Since electrons have a negative charge, this causes the fluorine end of the molecule to be more negative while the hydrogen is left striped of electrons and has it positively charged necleus exposed. This means that one end of the molecule is positive while the other is negative, which makes this molecule polar. The only reason I would pick D over C is that D addresses the second part of the question about the covalent bond. A covalent bond is simply when two atoms share electrons.

Let me know if this was right and I hope it helps.

Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.

Potential energy is the name for this positional energy that has been stored. Similar to how a drawn bow can store energy due to its posture. There is no energy in the bow while it is in its normal position, or when not drawn.

The bow can yet store energy when its position is changed from its normal equilibrium position because of its position.

Potential energy is the name for this positional energy that has been stored. Potential energy is the energy of position that a thing has stored inside it.

Therefore, Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.

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The oxidation reaction is the chemical reaction in which the species loses electrons. The five oxidized ethanedioic acid molecules will produce 8 water molecules. Thus, option B is correct.

Half reaction equations are the representation of the reduction and the oxidation half of the whole reaction that denotes the gaining and losing of electrons differently.

The oxidation half of the reaction is given as:

HO₂CCO₂H → 2CO₂ + 2H⁺ + 2e⁻

The reduction half of the reaction will be given as:

MnO₄ + H⁺ → Mn²⁺ + H₂O

The overall reaction is written as:

C₂O₄ ⁻² + MnO₄⁻ + H⁺ →  CO₂ + H₂O + Mn²⁺

Here electrons are lost in the formation of carbon dioxide and electrons are gained when manganese is produced.

The total reaction is given as:

5 C₂O₄ ²⁻ + 2MnO₄ ⁻ + 16H⁺ → 10CO₂ + 8 H₂O + 2 Mn²⁺

Therefore, option B. five ethanedioic acid molecules produce 8 water molecules.

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Answer:

Yes

Explanation:

Dissolving makes what is being dissolved and makes it mix with the water no longer holding its original shape. Dissolving may also change the color or texture of the liquid it is dissolved in. These are all physical changes.

The work w required to pump the water out of the spout will be 705600 joules.

Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.

Work against gravity is done on a thin layer of liquid with a width of y. The vertex of the trough serves as the center of our coordinate system.

It is obvious that the cross-section of the triangle has length y at a height y. A thin layer at height y is a rectangular box with a volume of 8 y , and lifting it requires a force equal to;

[tex]\rm F= \rho gV \\\\\rm F= 9.8 \times 10000 \times 8y \triangle y \\\\[/tex]

The work on the layer is;

[tex]\rm W= 78400 y \triangle y [4-y]\\\\\ W= \int\limits^3_0 {x} \, dx \\\\\ W= \int\limits^3_0{78400y[4-y]} \, dx \\\\\ W=705600 \ Joule.[/tex]

Hence, the work w required to pump the water out of the spout will be 705600 joule.

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The reaction of acids with alkalis or bases forming salts is called neutralization reaction. Neutralization reaction remove the acidity or basicity of the substance.

There are various kinds of reaction namely substitution reactions, displacement reactions, combination reaction, neutralization reactions, oxidation etc.

Neutralization reactions are those where, an acid neutralizes a base or vice versa. The product obtained will be neutral thus having no acidity or basicity as the name suggests.

For instance when HCl reacts with the base NaOH, the salt NaCl is formed which is neutral thus having the pH value of 7. Similarly, Acetic acid and KOH reacts together to form potassium salt of acetic acid or potassium acetate. These are all neutralization reactions.

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Answer:

it would be 25% sorry if I'm wrong

when the waves pass from the deeper water to the shallower water its speed will decrease.

Refraction of wave is the change in direction of a wave passing from one medium to another caused by its change in speed.

For example, waves travel faster in deep water than in shallower water.

Thus, we can conclude that when the waves pass from the deeper water to the shallower water its speed will decrease.

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The mass of the N₂O in the given question is 92.4g.

STEP1- Apply the ideal gas equation

            PV=nRT

STEP2- Put the given values in the equation

            P=130kPa,     T=298K,     V=40L  R=8.31

STEP3- Solve the equation

           N=PV/RT,

           N=130×40/8.31×298

             N=2.1moles

             N=mass/molecular mass

             mass=2.1×44

            mass = 92.4g

Hence, the mass of N₂O is 92.4g.

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The total mass of the product will be 137 grams.

From the equation of the reaction:

[tex]Zn + 2HCl --- > ZnCl_2 + H_2[/tex]

Mole of 130 grams of Zn = 130/65 = 2 moles

Equivalent mole of [tex]ZnCl_2[/tex] = 1 mole = 1 x135 = 135 grams

Equivalent mole of [tex]H_2[/tex] = 1 mole = 1 x 2 = 2 grams

Total mass of the products = 135 + 2 = 137 grams.

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Answer:

Pretty sure its C.

Explanation:

Carbon dioxide is known for trapping heat in the Earth's atmosphere so this makes sense.

Hope this helped!

The equilibrium constant equation for the reaction of ammonia , a weak base, with water is K=[NH₄⁺][OH⁻] / [NH₃].

Equilibrium constant is a number that expresses the connection between the quantity of products and reactants present at equilibrium in a reversible chemical reaction.

Given chemical reaction is:

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Equilibrium constant equation for the above reaction will be represent as:

K = [NH₄⁺][OH⁻] / [NH₃]

As value of pure water is 1 for the above equation.

Hence equilibrium constant equation for the reaction of ammonia is K=[NH₄⁺][OH⁻] / [NH₃].

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The generic outer electron configuration for the noble gases is ns₂ np₆. All noble gases have fully completely shell.

Noble gases are all monatomic gases, which all are odorless and colorless with very less reactivity.

All noble gases have completely filled s and p orbitals.

Generally, S orbital contain 5 electrons and p orbital contain 6 electrons

Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn) are all noble gases.

Thus, the generic outer electron configuration for the noble gases is ns₂ np₆.

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Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles , Option D is the correct answer.

What is an insulator ?

Insulators are those substances that do not conduct heat or electricity like their conductor counterparts.

Conduction of electric charges is as a result of the free flow of electrons in the atom of the substance.

Hence, a good insulator holds on tightly to its electrons and prevent them from flowing freely to conduct electric charges.

Therefore, Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles.

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B. Atoms in glass hold tightly to their negatively charged particles

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Ethylene is a compound in which two carbons are double-bonded to each other and bonded to 2 hydrogen atoms.

Ethylene has a chemical formula [tex]C_2H_4[/tex].

Thus, the 2 carbon atoms are bonded to one another by a double bond. Each of the carbon atoms then bonds with 2 hydrogen atoms to complete their octet state.

The structure is as below:

                       [tex]H_2[/tex]-C=C-[tex]H_2[/tex]

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Answer:

its a

Explanation:

trust

Answer:

divide the number of moles of NaCl by the volume of the solution. In this case that is 0.32 moles, NaCl split by 3.4 L gives 0.094 M NaCl.

Answer:

Explanation:

We know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.

So, hydrogen is the limiting reactant, and if 10 moles of hydrogen are used, then the reaction will occur 3.33 times.

Hence, this means there is enough nitrogen left for the reaction to occur another 0.67 times, and hence 0.67 moles of nitrogen will be left over.

The pH of a solution with [H₃O⁺] = 2.3 × 10⁻⁴M is 3.64 means the solution is acidic in nature.

pH of any solution is define as the negative logarithm of the concentration of hydronium ion as:

pH = -log[H⁺]

Given that concentration of H₃O⁺ or H⁺ = 2.3 × 10⁻⁴M

On putting values, we get

pH = -log(2.3 × 10⁻⁴)

pH = -(-3.64) = 3.64

Hence required pH value is 3.64.

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