9. What is the reason that BIGGER isotopes tend to be unstable, and thus, radioactive?

Answer:

[H⁺] = 3.548 x 10⁻⁴ M.

Explanation:

∵ pH = -log[H⁺]

∴ 3.45 = -log[H⁺]

log[H⁺] = -3.45

∴ [H⁺] = 3.548 x 10⁻⁴ M.

To find the hydrogen ion concentration from a pH of 3.45, calculate 10 to the power of negative pH, resulting in a hydronium ion concentration of approximately 3.55 × 10-4 M.

To calculate the hydrogen ion concentration for an aqueous solution with a pH of 3.45, we can use the definition of pH which is pH = -log[H3O+]. We need to reverse the process to find the concentration of hydronium ions (H3O+). This is done by taking the antilog (inverse log) of the negative pH value.

First, we reverse the sign of the pH to get -3.45. Using a calculator, we enter -3.45 and then press the 10x or exp button to find the concentration of H3O+. The result is that [H3O+] = 10-3.45 M, which calculates to approximately 3.55 × 10-4 M.

A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7, due to the logarithmic nature of pH levels.

When comparing the hydronium ion concentration between two aqueous solutions with different pH levels, it is important to understand the logarithmic scale of pH. A pH of 7 is considered neutral, and at this pH, the concentration of hydronium ions is 1.0 × 10-7 M. A solution with a pH of 5 would have a hydronium ion concentration of 1.0 × 10-5 M, which is a factor of 102 or 100 times more hydronium ions than a neutral solution of pH 7. Therefore, a 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7.

A 1 liter aqueous solution with a pH of 5.0 contains 100 times more hydronium ions compared to a 1 liter aqueous solution with a pH of 7. The pH scale is logarithmic, meaning that each unit represents a tenfold difference in concentration. So, a pH difference of 2 between two solutions corresponds to a 100-fold difference in hydronium ion concentrations. Since pH 5 is two units lower than pH 7, the concentration of hydronium ions in the solution with a pH of 5.0 is 100 times greater than the solution with a pH of 7.0.

Answer:

The missing pieces of the nuclear equation are:

Explanation:

1) Given nuclear reaction:

[tex]^9_4Be+^1_1H->^A_ZX+^4_2He[/tex]

2) A: mass number:

Balance the mass numbers of both sides of the nuclear reaction.

The mass number is the superscript to the left of the chemical symbol:

3) Z: atomic number

Balance the atomic numbers of both sides of the nuclear reaction

The atomic number is the subscript to the left of the chemical symbol:

4) Identity of the element.

The atomic number, which is the number of protons, identifies the unknown element: X.

You can find this information in a periodic table.

The element with atomic number 3 is lithium, and its chemical symbol is Li, hence X = Li.

the only process out of the four that does not happen in both animals implants would be photosynthesis. photosynthesis is when the cell takes the energy from the Sun's UV rays and turns into a form of energy that it can use

Answer: Photosynthesis.

Explanation: Photosynthesis can be defined as the process by which autotrophs synthesize food( glucose) from the carbon dioxide and water in the presence of sunlight.

The food that is produced by plants is used by plants for various types of the metabolic processes that takes place in the plant body.

This process only takes place in plants and it does not occurs in animals.Rest processes like cellular respiration, consumption of glucose and metabolic reaction takes place in both the plant and animal cell.

Answer:

A horizon, B horizon, C horizon .

Answer:

The A horizon, the B horizon, and the C horizon respectively.

The fossil fuels, CO2, greenhouse effect, and climate change are all things that are connected with each other and contribute for each successive one to occur. The fossil fuels are heavily used by the humans. Through their burning, the fossil fuels release lot of CO2 into the atmosphere. The CO2 is the most common greenhouse gas, thus it is a gas that manages to trap the heat into the atmosphere. So as the CO2 from the burning of the fossil fuels increases in the atmosphere, the greenhouse effect also increases. The greenhouse effect is the one that manages to keep the Earth warm, which is good, but it can also pass the limit and make the whole planet much warmer, resulting in rise of the sea levels because of the melting of the ice caps and glaciers. That will cause significant climate changes all over the globe because the sea currents will change, the atmosphere will keep more heat, and the water surface will increase.

Answer:

true

Explanation:

usually 1 is never written as the coefficient in chemical compounds and just ignored.

I believe the answer is True

A Proton has a Positive Charge

A single proton has one unit of positive charge. For a neutral atom the number of electrons and protons is equal and the charges gets canceled each other.

The basic unit every substance in the universe is called an atom like the cell in an organism. An atom is made of sub atomic particles protons, electrons and neutrons.

Neutrons are neutral and protons are positively charged particles. Electrons are negatively charged particles and they are revolving around the nucleus through circular trajectories of fixed energies.

The number of protons and electrons in an atom is same and that make an atom neutral in ground state. The positive charges of protons is canceled by equal number of negative charges.

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Final answer:

When the air inside a milk carton warms up, air molecules move faster, leading to increased pressure which could cause the carton to expand or burst. Higher temperatures also accelerate the spoilage process of the milk, making it sour quicker.

Explanation:

If the air in a carton of milk is allowed to warm up, the kinetic energy of the molecules in the air would increase. This means that the air molecules would move faster and collide with more force. As per the kinetic-molecular theory, when the temperature of a gas increases, the molecules gain more energy and their motion (kinetic energy) increases, which in turn causes an increase in pressure if the gas is confined in a container like a milk carton.

This increase in pressure could lead to the carton expanding or even bursting if it does not have an appropriate way to vent the increased pressure. Additionally, in the context of the milk itself, a higher temperature would accelerate the spoilage process. Bacteria that cause milk to spoil reproduce more quickly at higher temperatures, leading to the milk souring in a shorter amount of time.

Answer:

Matter is something that is made of atoms like a liquid, solid, or gas and energy is when water becomes a gas and the energy starts to get faster to where there is steam because the gas is being trapped inside the pot or any other object.

Explanation:

Answer:Any change that occurs without altering the chemical composition of a substance is a physical change. Physical changes can include changing the color, shape, state of matter, or volume of a substance. It is crucial to remember that physical changes never alter the chemical makeup.

Explanation:

i hope that helps u try to figure it out a little bit sorry i couldn't find your answer i didn't have much to go off of

Final answer:

A physical change in the shape of an object is caused by the application of force, resulting in a deformation without altering the object's chemical composition. Examples include the melting of ice, the separating of coins, and the tearing of paper.

Explanation:

The action that produces a physical change in the shape of an object is the application of a force resulting in deformation. When a force is applied, it may cause the object to undergo squashing, squeezing, ripping, twisting, shearing, or pulling, changing the object's shape. For instance, when melting an ice cube, it undergoes a physical change as it shifts from a solid to a liquid state. Crucially, although its shape and physical properties alter, the chemical composition remains unaltered. The same applies when separating a mixture of pennies and nickels into two groups, or tearing a piece of paper; you change the configuration or the appearance but not the substance's identity. These are all examples of physical changes.

Answer:

2.04 x 10²⁴ molecules

Explanation:

Given parameters:

Mass of Be(OH)₂ = 145.5g

To calculate the number of molecules in this mass of Be(OH)₂ we follow the following steps:

>> Calculate the number of moles first using the formula below:

Number of moles = mass/molarmass

Since we have been given the mass, let us derive the molar mass of Be(OH)₂

Atomic mass of Be = 9g

O = 16g

H = 1g

Molar Mass = 9 + 2(16 + 1)

= 9 + 34

= 43g/mol

Number of moles = 145.5/43 = 3.38mol

>>> We know that a mole is the amount of substance that contains Avogadro’s number of particles. The particles can be atoms, molecules, particles etc. Therefore we use the expression below to determine the number of molecules in 3.38mol of Be(OH)₂:

Number of

molecules= number of moles x 6.02 x 10²³

Number of molecules= 3.38 x 6.02 x 10²³

= 20.37 x 10²³ molecules

= 2.04 x 10²⁴ molecules

Answer:

A well balanced chemical equation should have fulfilled coefficient, formula and chemical state aspects.

Explanation:

Balancing of chemical equations requires ensuring an equal number of atoms for each element on both sides of an equation, using integer coefficients, representing reactions involving ions with ionic equations, and maintaining the same sum of charges between reactants and products.

The balancing of chemical equations is governed by four basic rules derived from the law of conservation of matter:

These fundamentals assist in understanding reaction stoichiometry and writing balanced chemical equations for different types of reactions including precipitation, acid-base, and oxidation-reduction (redox) reactions.

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Hello There!

Conduction is the transfer of heat from one particle of matter to another.

“I Have 3 Examples Of Convection Provided Below”

“A Pot Sitting On A Hot Burner”

“Picking Up A Hot Cup Of Coffee”

“Feet On Hot Sand”

The answer is:

The new temperature of the gas is equal to 388.22 K

Since we have a rigid container, we can safely assume that the volume is kept constant.

To solve the problem, we need to use the Gay Lussac's Law, which states that the pressure and the volume of an ideal gas are proportional  when the volume is kept constant.

Also, we need to remember that Gay Lussac's Law works with absolute temperature, so, we need to convert the given temperature (in celsius degrees) to Kelvin.

[tex]T(K)=273.15 + T(\°C)\\\\T(K)=273.15 +25=298.15K[/tex]

So, using the Gay Lussac's equation, we have:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Where,

[tex]P_1[/tex] is equal to the first pressure.

[tex]T_1[/tex] is equal to the first temperature.

[tex]P_2[/tex] is equal to the new pressure.

[tex]T_2[/tex] is equal to the new temperature.

We are given the following information:

[tex]P_1=0.96atm[/tex]

[tex]T_1=298.15K[/tex]

[tex]P_2=1.25atm[/tex]

Then, substituting and calculating, we have:

[tex]T_2=P_2*\frac{T_1}{P_1}\\\\T_2=1.25atm*\frac{298.15K}{0.96atm}=388.22K[/tex]

Hence, the new temperature of the gas is equal to 388.22 K.

Have a nice day!

Answer: the person up there had the correct answers so far, but didn’t complete it, but after converting it , finish it .

temperature in celcius - 388 K - 273 = 115 °C

answer is C. 115 °C

Answer:

Option: B.

Explanation:

Weathering

Answer: weathering is your answer

Explanation:

Answer:

To determine a molecular formula from the empirical formula you need to know:

-the molecular mass

-calculate the empirical formula mass

-divide the molecular formular by the empirical formula mass

-multiply by this whole number the empirical formula

Explanation:

See the image below

Answer:

Concentration cells have the same substance for both anode and cathode.

Explanation:

Plato

The correct statement about concentration cell is concentration cells have the same substance for both anode and cathode. The correct option is D.

Anode is the negative terminal of the cell in which the electrons are released or reduced.

The cathode is the positive terminal where the electrons are accepted, here oxidation occurs.

Thus, the correct option is D. Concentration cells have the same substance for both anode and cathode.

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Answer:

SPECIFIC HEAT CAPACITY

Explanation:

Q = MC DELTA T

q = heat

c = specific heat

T = temperature ( final - initial )

The formula used to calculate the heat required to warm or cool one phase of matter is given by the specific heat capacity equation:

[tex]\[ Q = mc\Delta T \][/tex]

where:

- [tex]Q\\[/tex] is the amount of heat energy transferred,

- [tex]m[/tex] is the mass of the substance,

- [tex]c[/tex] is the specific heat capacity of the substance (the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius),

- [tex]\( \Delta T \)[/tex] is the change in temperature, calculated as the final temperature minus the initial temperature[tex](\( T_{\text{final}} - T_{\text{initial}} \)).[/tex]

 This formula assumes that no phase changes occur during the heating or cooling process. If a phase change does occur (such as melting or boiling), a different formula involving the latent heat of fusion or vaporization is used. The latent heat formula is:

[tex]\[ Q = mL \][/tex]

 where:

- [tex]\( L \)[/tex] is the latent heat of fusion (for melting or freezing) or latent heat of vaporization (for boiling or condensing).

 In summary, to calculate the heat required to warm or cool a substance without a phase change, use the specific heat capacity equation. If a phase change is involved, use the latent heat equation.

Answer:

the reaction with the hydrochloric acid and the sodium hydroxide gives you HCl + NaOH which gives you H2O + NaCl.

Explanation:

Balance the chemical equation. Balancing the neutralization reaction involves the process of making sure that there is an equal number of moles of each of the elements on both sides of the equation.

The answer is B :))))

If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants. Therefore, the correct option is option B.

Le Chatelier's principle, sometimes referred as Chatelier's concept, is indeed a chemical concept that predicts how changes in conditions would impact chemical equilibria. The idea is named for Karl Ferdinand Braun and, on occasion, French scientist Pierre Louis Le Chatelier, who independently discovered it.

When a concentration, temperature, volume, or pressure increase is applied to a simple system in thermodynamic equilibrium, it moves to a new equilibrium. The earlier alteration is somewhat cancelled out by this new equilibrium.  If more hydrogen gas is added to the reaction mixture, there will be a shift toward the reactants.

Therefore, the correct option is option B.

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the second law of thermodynamics

Answer:

Both have a pH greater than 7, but NH₃ has a lower pH than KOH.

Explanation:

Both have a pH greater than 7, but NH₃ has a lower pH than KOH.

Answer: B) Both have a pH greater than 7, but NH3 has a lower pH than KOH.

Answer:

a. Electric Energy

b. Light Energy

c. Thermal Energy

Explanation:

a. When a lamp is turned on by means of a switch, electric energy is usually used, since that is the form of energy that is generated when there is a potential difference between two points, which allows to establish an electric current, that electric current travels through the wires up to the bulb of the lamp

b. In this case a case of light energy is presented since that is the energy transported by the light and that is manifested on the matter in different ways, one of them is to remove the electrons from the metals. This is what usually happens in some types of light bulbs, that when the displacement of the electrons is promoted, a beam of light is generated.

c. The last case is a case of thermal energy, since this energy is that expressed as the total kinetic energy resulting from the random movements of atoms and molecules. This was what could happen in case b, when the beam of light was generated. This energy is released in the form of heat, and may present high temperatures.

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.

The correct answer is mentioned below.

According to the question, the energy used in the question is as follows:-

Hence, the correct answer to the question is mentioned above.

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Object A will have a positive charge since it is losing electrons. And object B would have a negative charge since its gaining electrons. For example, magnesium atom is object A and chloride atom is object B. Magnesium atom gives an electron away to the chloride atom. Therefore the chloride atom will have a negative charge of one and magnesium has a positive charge of 1.

The answer is A. Object A will have a positive charge.

The answer is:

The number of moles (n) is 65.55 mol.

[tex]n=65.55mol[/tex]

To solve the problem, we need to use the ideal gas law.

The Ideal Gas Equation is given by the following expression:

[tex]PV=nRT[/tex]

Where,

P, is the pressure in atm

V, is the volume in liters (L)

n, is the number of moles

R, is the Ideal Gas Constant

T, is the temperature in Kelvin (K)

We are given the information:

[tex]P=12500Pa\\V=1750dm^{3}\\T=127\°C[/tex]

We need to convert the given units in order to use the Ideal Gas Equation, so, converting we have:

Pressure:

We know that:

[tex]1atm=101325Pa[/tex]

So, converting we have

[tex]125000Pa*\frac{1atm}{101325Pa}=1.23atm[/tex]

Volume:

We know that:

[tex]1L=1dm^{3}[/tex]

So, we have:

[tex]1750dm^{3}=1750L[/tex]

Temperature:

We know that to convert from celsius degrees to Kelvin, we need to perform the following operation:

[tex]T(K)=T(\°C)+273.15[/tex]

So, converting we have:

[tex]T(K)=127+273.15=400.15[/tex]

Also,  we have that

[tex]R=0.08205746\frac{atm.L}{mol.K}[/tex]

Now, substituting the given information into the equation to isolate "n", we have:

[tex]PV=nRT\\\\1.23atm*1750L=n*0.08205746\frac{atm.L}{mol.K}*400.15K\\\\2152.5atm.L=n*32.84\frac{atm.L}{mol}\\\\n=\frac{2152.5atm.L}{32.84atm.L}mol\\\\n=65.55mol[/tex]

Hence, we have that the number of moles (n) is 65.55 mol.

Have a nice day!

Answer:

65.81

Explanation:

Educere/ Founder's Education

Answer:

Ionic Bonding: The formation of an Ionic bond is the result of the transfer of one or more electrons from a metal onto a non-metal.

Covalent Bonding: Bonding between non-metals consists of two electrons shared between two atoms.

Explanation:

Answer:

14,938 tablets.

Explanation:

WE divide:

1.21 kg / 81 mg

1.21 kg = 1,210 g = 1.210,000 mg.

So it is 1,210,000 / 81

= 14,938 tablets.

14,938 tablets of 81mg aspirin tablets can be made from 1.21 kg of aspirin​

It is a medication used to reduce pain, fever, or inflammation.

Calculation for doses:

[tex]\frac{1.21 kg}{81 mg}\\\\1.21 kg = 1,210 g = 1.210,000 mg[/tex]

Thus,

[tex]\text{Number of tablets} =\frac{1,210,000mg}{81mg} \\\\= 14,938 \text{ tablets}[/tex]

Thus, number of tablets are 14,938.

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Final answer:

The correct statement is that in a concentration cell, the reactions are the same but the concentrations are different, which results in a cell potential greater than 0.00 volts until equilibration.

Explanation:

The correct statement about concentration cells is: The concentrations are different and the reactions are the same, so the cell potential is not 0.00 volts. Essentially, concentration cells consist of two half-cells with identical electrodes and the same redox active species at different concentrations. The standard electrode potential (E°) in a concentration cell is zero because the electrodes are identical; however, there is a potential difference, calculated with the Nernst Equation, due to varying concentrations. As the reaction in a concentration cell proceeds, the concentrations equilibrate and the cell potential (ΔEcell) decreases until the concentrations become equal and ΔEcell reaches zero.

A sphere is perfectly symmetrical and it is not a polyhedron. A sphere has a constant width and circumference. The volume of the sphere with a diameter of 4cm is  33.40 cm³. The correct option is B.

The amount of space occupied by the three dimensional object is defined as the volume of the sphere. A sphere is defined by three axes namely x-axis, y-axis and z-axis. It has no flat face but a curved face.

The equation used to calculate the volume of sphere is:

Volume = 4/3 πr³

Diameter = 4cm

radius = 2cm

Then the volume is:

Volume = 4/3 × 3.14 × (2)³

Volume = 33.40 cm³

Thus the correct option is B.

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Your question is incomplete most probably your full question was:

The diameter of a sphere is 4 centimeters. Which represents the volume of the sphere?

A. 321 cm³

B. 33.40 cm³

C. 541 cm³

D. 167 cm³