Calculate the pH of a solution if the concentration of hydronium ions (H3O+) is 4.8 x 10-11M?

Answer:

Image D...final answer

We can see here that the image that represents the Coulomb force between two negatively charged particles is D. Image D

The Coulomb force, also known as Coulomb's law or electrostatic force, is a fundamental concept in physics that describes the force between two charged objects. This force arises from the electric charge of particles and plays a crucial role in understanding the behavior of charged particles, such as electrons and protons. Coulomb's law states:

F = k × (|q₁ × q₂|) / r²

Where:

F is the electrostatic force between the two charges.

k is Coulomb's constant, approximately equal to 8.988 × 10^9 N m²/C².

q₁ and q₂ are the magnitudes of the charges.

r is the separation between the charges.

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Answer:

1.88 M

Explanation:

The following data were obtained from the question:

Mole of NaCl = 0.47 mole

Volume of solution = 0.25L

Molarity =?

Molarity is defined as the mole of solute per unit litre of the solution. It can represented mathematically as:

Molarity = mole /Volume

Using the above formula, the molarity of the salt water solution can be obtained as follow:

Molarity = 0.47/0.25

Molarity = 1.88 M

Answer:

Carbon

Explanation:

looked it up

The element that humus is especially rich in is  carbon.  Option 2.

Humus is a dark, organic component of soil formed from the decomposition of plant and animal matter. It is the result of the breakdown of organic materials such as leaves, roots, and other organic residues.

Carbon is a significant component of these organic materials, and as they decompose, a portion of the carbon is transformed into stable organic compounds, forming humus.

Humus plays a crucial role in soil fertility and nutrient cycling and is known for its high carbon content.

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Match these items are given below .

1) 0 °C                                          Freezing point of water

2) chemical property                   ability to react with another substance

3) Buoyancy                                upward force of a fluid on an object  

4) gas                                         molecules far apart

5) mass                                       amount of matter in object

6) solid                                        fixed shape

7) crystalline                                fixed internal order

8) frozen water                            expands

9) Amorphous                             no definite internal order

Thus,

1) 0 °C                                          Freezing point of water

2) chemical property                   ability to react with another substance

3) Buoyancy                                upward force of a fluid on an object  

4) gas                                          molecules far apart

5) mass                                       amount of matter in object

6) solid                                        fixed shape

7) crystalline                                fixed internal order

8) frozen water                            expands

9) Amorphous                             no definite internal order

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Items 1-9 are matched and described. The topic is the characteristics and properties of matter.

The matching items in this question are:

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Answer:

Ionic Bond

Explanation:

Ionic Bonds are formed through electrostatic attraction between two ions that are opposite charge (also meaning a metal and a nonmetal).

Final answer:

Nonmetals like Cl combine with metals like Na through ionic bonding, where Na donates an electron to Cl, resulting in the formation of a stable compound, NaCl, with drastically different properties from the individual elements.

Explanation:

Nonmetals such as chlorine (Cl) combine with metals such as sodium (Na) primarily through the formation of ionic bonds. In this type of chemical bonding, the metal atom, sodium in this case, donates its valence electron to the nonmetal atom, chlorine, creating oppositely charged ions. Sodium becomes a positively charged cation (Na+), and chlorine becomes a negatively charged anion (Cl-). These oppositely charged ions are then attracted to each other due to electrostatic forces, forming a stable crystalline compound, sodium chloride (NaCl), commonly known as table salt. The process of these elements combining leads to a compound that has entirely different properties from its constituent elements. For example, while individual sodium atoms react explosively with water, and chlorine gas is extremely toxic, combined as sodium chloride, they form an essential compound for life that is stable and nonreactive in nature.

Answer:

A

Explanation:

Hundreds of stars

Answer:

The meaning of star system is group of hundreds of stars , that form around the same time .

Explanation:

Answer:

D. Ionic bond

Explanation:

First some definitions: ionic bonds always have metals that transfer electrons. Covalent bonds are between nonmetals that share electrons. (Sharing is caring!)

Li is a metal, so right off the bat we know this is not a covalent bond. However, it's not a metal, so we can cross off C as well. The phrase "paired bond" isn't common, so we know the answer must be D. ionic bond.

And in this bond, Li's electrons will transfer to O to make both have a full valence shell. (As opposed to covalent bonds, which share electrons, not transfer completely.)

Answer:

Absorb energy.

Explanation:

If you wanted to make a cold pack that absorbs heat (aka an endothermic reaction), then you'd want to use a chemical that absorbs energy. This would absorb the heat. Hope this helped :)

It is critical to evaluate the sort of chemical that will be utilised while creating a cold pack. The solution is dependent on the desired consequence of the cold pack.

A cold pack is often made using an energy-absorbing substance. The most popular form of cold pack employs a chemical process to absorb energy from the environment, causing the pack's temperature to drop.

A "chemical cold pack" is another name for this sort of cold pack. A chemical cold pack's chemical reaction is often an exothermic reaction. This indicates that the reaction generates heat, which the pack absorbs and causes the temperature to fall.

Another application for a cold pack To absorb energy, a phase transition substance such as wax or glycol is used. A "phase change cold pack" is another name for this sort of cold pack. The phase change material absorbs energy from the environment, lowering the temperature of the pack.

This sort of cold pack is frequently used for medicinal purposes, such as relieving sprains and strains. Finally, when creating a cold pack, it is critical to consider the type of chemical that will be used. A chemical that absorbs energy is typically used to construct a cold pack, as this causes the pack's temperature to drop.

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Answer:

The final temperature of the water is 25.6 °C.

Explanation:

We have,

Heat added to water is 135.7 J

Mass, m = 54 g

Initial temperature was 25 °C

It is required to find the final temperature of the water. The heat added when temperature is increased is given in terms of specific heat capacity as :

[tex]Q=mc(T_f-T_i)[/tex]

[tex]T_f[/tex] is final temperature

c is specific heat capacity, for water, [tex]c=4.184\ J/g^{\circ} C[/tex]

So,

[tex]T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{135.7}{54\times 4.184}+25\\\\T_f=25.6^{\circ} C[/tex]

So, the final temperature of the water is 25.6 °C.

To find the final temperature of water after heat is added, the heat equation Q = m x c x ΔT is used. By dividing the amount of heat (135.7 J) by the product of water's mass (54.0 g) and its specific heat capacity (4.184 J/g°C), we find that the temperature increases by 0.60 °C. Thus, from an initial temperature of 25.0 °C, the water's final temperature is 25.6 °C.

To calculate the final temperature of water after a certain amount of heat is added, we use the formula
Q = m × c × t. Here Q represents the heat added in joules, m is the mass of the water in grams, c is the specific heat capacity of the water (which is 4.184 J/g°C), and ΔT is the change in temperature in degrees Celsius. For a given amount of water at an initial temperature, the added heat will increase the water's temperature by a certain amount based on this formula.

In this case, 135.7 J of heat are added to 54.0 g of water initially at 25.0 °C. The specific heat capacity of water (c) is a well-known constant, 4.184 J/g°C. The change in temperature (ΔT) can be calculated as follows:

ΔT = Q / (m × c)

ΔT = 135.7 J / (54.0 g times4.184 J/g°C)

ΔT = 135.7 J / (225.936 J/°C)

ΔT = 0.60 °C

The final temperature of the water is the initial temperature plus the increase in temperature:

T(final) = T(initial) +ΔT

T(final) = 25.0 °C + 0.60 °C

T(final) = 25.6 °C

Answer: 24 moles of [tex]SnF_2[/tex] are produced.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

[tex]{\text{Moles of} H_2}=\frac{48g}{2g/mol}=24moles[/tex]

[tex]Sn+2HF\rightarrow SnF_2+H_2[/tex]

According to stoichiometry :

1 mole of [tex]H_2[/tex] is accompanied with = 1 mole of [tex]SnF_2[/tex]

Thus 24 moles of [tex]H_2[/tex]  is accompanied with =[tex]\frac{1}{1}\times 24=24moles[/tex]  of [tex]SnF_2[/tex]

Thus 24 moles of [tex]SnF_2[/tex] are produced.

Answer: 128 mL

Explanation: 120mL/300k=v2/320k

The new volume of the balloon when the temperature increases from 300.0 K to 320.0 K, while keeping pressure constant, is 128.0 mL.

The original question asks for the new volume of a balloon filled with gas when the temperature is increased from 300.0 K to 320.0 K, assuming pressure remains constant. This is a direct application of Charles's Law, which states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its temperature in Kelvin. The formula for Charles's Law is V₁/T₁ = V₂/T₂, where V₁ and T₁ are the initial volume and temperature, and V₂ and T₂ are the final volume and temperature, respectively.

To solve for V₂, we rearrange the formula to V₂ = V₁ × (T₂/T₁). Plugging in the values:

V₁ = 120.0 mL (initial volume)

T₁ = 300.0 K (initial temperature)

T₂ = 320.0 K (final temperature)

So, V₂ = 120.0 mL × (320.0 K / 300.0 K)

V₂ = 120.0 mL × (1.0667)

V₂ = 128.0 mL when rounded to three significant figures.

Answer:

Answer is option (d) (lowest to highest)

We have to rank the six vehicles according to the CO2 emission causing an impact on global warming. We know that burning of coal has the highest emission of all fossil fuel so EV powered by electricity from it will be the highest impact on global warming with highest CO2 emission, next is burning of gasoline, but the CO2 emission can be varied by the process of the burning in engines obviously a high-efficiency burning will have less impact than a regular standard engine. So, after ICEV standard will have high CO2 emission than the ICEV (high efficiency), now the next will be EV which is having its electricity supplied by a mix of resources, the production involves both fossil and non-fossil fuel which make this vehicle more environmentally friendly than the full fossil fuel-based. The ICEV with less driving has the second least emission because you are not burning the fuel like other vehicles because of not driving the vehicle. In the last will be the EV having powered by electricity of wind it will be the least emission almost zero because it using wind power to generate electricity. Hence arrangement comes like this, EV(wind), ICEV(less driving), EV (mix of sources), ICEV (high-efficiency), standard ICEV, EV (coal) from lowest to highest CO2 emission.

Answer:

n = 0.26 mol.

Explanation:

Given,

Pressure, P = 99.7 kPa = 1 atm

where 101.325 kPa  = 1 atm

            P = 0.984 atm

Temperature, T = 297 K

Volume = 6.452 L

Now, using ideal gas equation

PV = n RT

0.984 x 6.452 = n x 0.08206 x 297

n = 0.26 mol.

Coach is to football plays, as meteorologist is to: D. precipitation patterns.

A coach refers to an individual who is an expert or professional in the game of soccer and as such he or she manages a football team, while guiding the team members on how to play football. Thus, the activity of a coach is directly related to football plays against an opposition team.

On the other hand, a meteorologist refers to an individual who is an expert or professional in the field of meteorology and studies the weather in a region. This ultimately implies that, a meteorologist is saddled with the responsibility of studying the elements of weather in a particular geographic region and over a specific period of time.

Generally, some examples of the elements of weather are:

Deductively, we can conclude that a meteorologist studies precipitation patterns in a particular geographic region and over a specific period of time.

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Answer:

0.0010 mol·L⁻¹s⁻¹  

Explanation:

Assume the rate law is  

rate = k[A][B]²

If you are comparing two rates,

[tex]\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \dfrac{k_{2}\text{[A]}_2[\text{B]}_{2}^{2}}{k_{1}\text{[A]}_1[\text{B]}_{1}^{2}}= \left (\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}}\right ) \left (\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}\right )^{2}[/tex]

You are cutting each concentration in half, so

[tex]\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}} = \dfrac{1}{2}\text{ and }\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}= \dfrac{1}{2}[/tex]

Then,

[tex]\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \left (\dfrac{1}{2}\right ) \left (\dfrac{1}{2}\right )^{2} = \dfrac{1}{2}\times\dfrac{1}{4} = \dfrac{1}{8}\\\\\text{rate}_{2} = \dfrac{1}{8}\times \text{rate}_{1}= \dfrac{1}{8}\times \text{0.0080 mol$\cdot$L$^{-1}$s$^{-1}$} = \textbf{0.0010 mol$\cdot$L$^{-1}$s$^{-1}$}\\\\\text{The new rate is $\large \boxed{\textbf{0.0010 mol$\cdot$L$^\mathbf{{-1}}$s$^{\mathbf{-1}}$}}$}[/tex]

Answer:

See explanation and images attached

Explanation:

The equation for the laboratory preparation of nitrogen is:

NH4Cl(aq) + NaNO2(aq) → N2(g) + 2H2O(l) + NaCl (aq).

When concentrated sulphuric acid is used, the nitrogen gas is oxidized to ammonia

N2(g) + 3H2(g) -----> 2NH3(g)

2Na(s) + 2H2O(l) -----> 2NaOH(aq) + H2(g) NOTE HERE THAT THE SECOND PRODUCT IN THIS REACTION IS HYDROGEN GAS AND NOT WATER AS WRITTEN IN THE WORD EQUATION.

Molecular formula of calcium phosphate is Ca3(PO4)2

Molecular formula of sodium bicarbonate is NaHCO3

In the duplet state, the outermost shell of an atom contains only two electrons e.g helium.

Octet state means that the outermost shell of the atom contains eight electrons as in the noble gases Ne, Ar, Kr etc

The equation for the laboratory preparation of oxygen is ;

2KClO3(s)----> 2KCl(s) + 3O2(g)

Finally, if an element burns in air to give a soluble oxide which turns red litmus blue (basic property) then the element is a metal. Metals form basic oxides which dissolve in water to form alkaline solutions which turns red litmus paper blue.

Answer:

both the atomic mass and the atomic number increase from left to right

Explanation:

Answer:

c

Explanation:

i just did it

Answer:

An acid is higher on the pH scale, bases are slippery compared to acids.

Explanation:

Answer:

ideal gas law

Explanation:

Consider the proportionality below. P V is proportional to n T. It represents the ideal gas law. Therefore, option C is correct.

The gas laws are made up of three major laws: Charles' Law, Boyle's Law, and Avogadro's Law (all of which will later combine into the General Gas Equation and Ideal Gas Law).

Boyle's law, Charles' law, Gay-law, Lussac's and Avogadro's law are combined to form the ideal gas law: P·V = n·R·T.

The ideal gas law (PV = nRT) describes how the macroscopic properties of ideal gases are related. An ideal gas is one in which the particles do not attract or repel one another and occupy no space (have no volume).

Thus, option C is correct.

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Answer:

1. Ionic bond

2. High melting point and high boiling point for ionic bonds while covalent bonds have low melting and boiling point.

3. The similarity is that ionic and covalent bonding lead to the creation of stable molecules.

4. 4Fe + 3O2 → 2Fe2O3

5. It uses the process of fission.

6. Fission involves the splitting of radioactive elements into smaller particles/compounds while Fusion involves combining of two or more atomic nuclei to form one or more different atomic nuclei and subatomic particles.

7. Nuclear power plants produce little to no greenhouse gas.

Nuclear power plants produce a large amount of energy for a small mass of fuel.

Nuclear is less expensive.

Answer:

ALL ISOTOPES OF AN ELEMENT HAVE THE SAME NUMBER OF;

1. PROTON

2. ATOMIC NUMBER

Explanation:

Isotopes are atoms with the same atomic number but different mass numbers. Isotopes of an element has the same number of proton which dictates the atomic number of the atoms. The difference in mass number is as a result of the difference in the number of neutrons. Isotopes of an atom have different physical properties but they exhibits the same chemical properties because neutrons have no influence on the chemical properties and the change or difference in neutrons will produce no effect on the chemical properties of the atoms. Neutrons only contributes to the mass of the atoms giving the isotopes of an atom different mass numbers. An example is chlorine with two isotopes, Cl -35 and Cl -37.

Properties                            Cl-35                                                    Cl-37

mass number                        35                                                        37

atomic number                      17                                                         17

number of protons                17                                                          17

number of electrons                17                                                       17

number of neutrons        35-17 = 18                                             37-17 = 20

abundance in nature             75%                                                    25%

From the given information;

An isotope is are two or more atomic element that contains the same equal number of protons in the nucleus of an atom but with a different number of neutrons.

They share the same similar chemical properties and they behave in the same manner in the chemical reaction but have different mass numbers due to the different number of neutrons.

The difference in their mass numbers influences the rate of their chemical reactions.

They also exhibit different stability. While some are stable, some are unstable, and they can be referred to as radioactive isotopes.

Therefore, we can conclude that:

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Answer:

Some of the acid has dissociated

Explanation:

If Ka is a great deal extra than 1, the acid is basically dissociated and so is said to be a robust acid. If Ka is much less than 1, the acid is dissociated only to a small quantity and so is said to be a vulnerable acid.

So the suitable answer is option D. some of the acids have dissociated.

the usage of Ka and pKa To are expecting Equilibrium and strength of Acids. Ka can be used to measure the placement of equilibrium: If Ka is massive, the formation of the goods of the dissociation is favored. If Ka is small, the undissolved acid is preferred.

The acid dissociation constant (Ka) is used to distinguish sturdy acids from susceptible acids. robust acids have fairly excessive Ka values. The Ka price is located by looking at the equilibrium regular for the dissociation of the acid. The better the Ka, the greater the acid dissociates.

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Answer:

Drawing attention to the ordinary and under-appreciated rural landscape, the fence inspired and provoked a different relationship with the land, emphasising an unrestrained imagination of possibility rather than the arbitrary nature of political and geographical boundaries, alluded to in its title.

Explanation:

Focusing on the ordinary underrated rural landscape, the fence stimulates and triggers different relationships with the land, not the arbitrariness of the political and geographical boundaries implied by its title, but of the possibilities. Emphasizing the concept of unlimited

The artwork is created for purposes such as conveying a social, political, or personal message. The meaning of artwork comes from a combination of viewer, artist, artwork, and context. The meaning of the artwork is enhanced by the emotions and the artist's ability to convey emotions.

Expression is the ability to communicate through art. Artistic expressions convey something about the children's "self", their likes, interests, emotions, personal experiences, and choices. Please provide the painting materials as soon as possible.

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Answer:

0.5

Explanation:

We are given the moles of two reactants, so this could be a limiting reactant problem.

We know that we will need moles, so, lets assemble all the data in one place.

              2Ca₃(PO₄)₂ + 6SiO₂ + 10C → P₄ + 6CaSiO₃ + 10CO

n/mol:             1                 3

Calculate the moles of P₄ that can be formed from each reactant :

1. From Ca₃(PO₄)₂

[tex]\text{Moles of P}_{4} = \text{1 mol Ca$_{3}$(PO}_{4})_{2} \times \dfrac{\text{1 mol P}_{4}}{\text{2 mol Ca$_{3}$(PO}_{4})}_{2} = \text{0.5 mol P}_{4}[/tex]

2. From SiO₂

[tex]\text{Moles of P}_{4} = \text{3 mol SiO}_{2} \times \dfrac{\text{1 mol P}_{4}}{\text{6 mol SiO}_{2}} = \text{0.5 mol P}_{4}[/tex]

Each reactant forms 0.5 mol of P₄.

Answer:

O2(g) was Reduced

Explanation:

It is necessary at this point to restate the working definitions of oxidation and reduction.

Oxidation refers to increase in oxidation number. A chemical specie is oxidized in a chemical reaction if there is a positive increase in its oxidation number from left to right in the reaction.

A chemical specie is said to be reduced when there is a decrease in its oxidation number from left to right in a reaction. Hence reduction refers to a decrease in oxidation number.

Now let us focus on O2(g). Its oxidation number on the left hand side is zero. On the right hand side, its oxidation number decreases to -2. This shows a decrease in oxidation number. From our premises above, we can safely conclude that O2(g) was reduced in the reaction.

The answer to whether the Oxygen (O₂) is oxidized or reduced is that;

The oxygen (O₂) is being reduced.

We are given the equation;

C₂H₅OH (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (g) ΔH° = –1270 kJ/mol_rxn

Now, Oxidation in this context will be an increase in oxidation number. This means that we consider a chemical element in a chemical reaction to be undergoing oxidation if there is a positive increase in its oxidation number from left to right in the reaction. Otherwise, it is said to undergo reduction.

Now, when we assign oxidation numbers to the elements in the chemical equation, the oxygens in O₂ (g) would be zero. Meanwhile the oxygens in both CO₂ (g) and H₂O (g) are -2.

In conclusion, since the oxygens in both CO₂ (g) and H₂O (g) are -2, it means oxidation number has reduced and as such there is a reduction in oxygen.

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Answer:

increases to 100 times the original concentration

Explanation:

Took the test and got it right.

Answer:

increases to 100 times the original concentration

Explanation:

got it right on edge

Answer:

a state in which opposing forces or influences are balanced

Explanation:

Answer:

c

Explanation:

it should be the cathode, where metal ions are reduced to metal atoms.

correct on edge 2021