Why must ionic compound have a total charge of 0?

The amount of heat required to raise the temperature of 125.0 g of aluminum by 12°C is 1611 joules.

Temperature = 12°C

Mass = 125.0 g

To estimate the amount of heat required, we need to use the formula:

Q = m * c * ΔT

Q = the amount of heat in joules

m = the mass of the substance in kilograms

c = the specific heat capacity of the substance

ΔT = the change in temperature in degrees

The specific heat capacity of aluminum = 0.897 J/g°C.

Q = 125.0 g * 0.897 J/g°C * 12°C

Q = 1611 J

Therefore, we can conclude that the amount of heat required is 1611 J.

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To solve such this we must know the concept of addition reaction. The reaction between alkyne and HCl gives addition product. The reaction can be written as

CH\(\equiv\)CH +HCl\(\rightarrow\)CH\(_2\)=CHCl

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Alkyne is electron rich species. The reaction between alkyne and HCl gives addition product. The reaction can be written as

CH\(\equiv\)CH +HCl\(\rightarrow\)CH\(_2\)=CHCl

Therefore, the reaction can be written as

CH\(\equiv\)CH +HCl\(\rightarrow\)CH\(_2\)=CHCl

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The yield in percentage is 24.4%.

A chemical element with the symbol H and atomic number 1 is hydrogen gas. It makes up around 75% of the universe's elemental mass and is both the lightest and most prevalent element. A tasteless, odorless, and colorless gas is hydrogen.

The formula for percent yield is as follows:

(Actual Yield / Theoretical Yield) x 100% = percentage yield

The actual yield, or 2.2L, is the amount of hydrogen gas that Chavius and Ashlee actually procured. The theoretical yield is 9.0L, which is the quantity of hydrogen gas they should have recovered, based on their estimates.

Adding these values to the formula yields the following results:

yield is calculated as (2.2L/9.0L) x 100%.

yield in percentage = 0.2444 x 100%

yield as a percentage = 24.4%

Hence, the yield as a percentage is 24.4%.

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Answer:

A

Explanation:

chemical reaction are those type of reaction that are irreversible and a new substance is being formed therefore when the iron combine with water and air it leads to rusting.

This is kind of a pretty easy question:

- In order to get the number of atoms/entities of Neon, you will have to turn that 1009g of Neon into moles

-And then you have to use the moles and calculate it using Avogadro's Number which is 6.02 x 10^23

number of moles = mass/molar mass of element/compound

n = 1009g/20.18g/mol

n = 50 mol

Number of atoms/entities = 50 x  (6.02 x 10^23)

Number of atoms in 1009g of neon is 3.01 x 10^25 (scientific notation because its a really long number)

The concentration of ca 2 in blood plasma in equivalent if its concentration is 0.0080.

Concentration means the amount of or parts in terms of the alternative components. For acid–base reactions, the equivalent weight of an acid or base is the mass which materials or reacts with one mole of hydrogen

In chemistry, equal weight (additionally known as gram equal is the mass of 1 equivalent, that is the mass of a given substance as a way to integrate with or displace a fixed amount of any other substance. The equivalent weight of an detail is the mass which combines with or displaces 1.008 gram of hydrogen or eight. Zero grams of oxygen or 35.five grams of chlorine. those values correspond to the atomic weight divided through the usual valence for oxygen as example that is sixteen.

Charge on one Ca ​​​​2+  ion = + 2 .

Concentration of calcium ion = 0.0040M

⇒ Concentration of Ca ​​​​​2 +  in blood plasma = 0.0040 × 2

=  0.0080 equivalent  Ca ​​​​​2                  answer

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Explanation:

Using the formula ΔTb = Kb x molality, where ΔTb is the change in boiling point, we can solve for it and add it to the boiling point of pure water to find the boiling point of the KCl solution.

ΔTb = Kb x molality

ΔTb = 0.512 °C/m x 0.74 molal

ΔTb = 0.37968 °C

Boiling point of KCl solution = 100.00 °C + 0.37968 °C

Boiling point of KCl solution = 100.38 °C

Therefore, the boiling point of the KCl solution is 100.38 °C.

A radioactively decaying isotope whose nuclei split apart on their own to create a daughter isotope (often of a different element). For instance, the parent isotope of strontium-87, rubidium-87, decays into it with a half-life of 4.88 x 1010 years.

Through a process known as radioactive decay, the unstable isotopes transform into more stable isotopes over time. The more stable version is referred to as the daughter isotope, and the initial unstable isotope is known as the parent isotope. The exponential rate of isotope decay can be expressed in terms of half-life.

Geologists value isotopes because each radioactive element decays at a specific rate that is constant for that element. Since the ratio of parent and daughter isotopes in rocks can now be measured, you can determine when the rocks were produced. These rates of decay are known.

Only 12.5% of the original parent atoms are still present after three half-lives. The amount of parent atoms left shrinks to zero as more half-lives pass.

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The pKa of phenolphthalein is around 9.4. Therefore, the pKa of the indicator is 9.4.For the color of the indicator in a solution with pH = 6, we can use the table of acid-base indicators. At a pH of 6, the color of phenolphthalein is colorless. Therefore, the color of this indicator in a solution with pH = 6 is colorless.

The balanced chemical equation for the titration of 0.230 M methylamine (CH3NH2) with 0.230 M HCl is;CH3NH2(aq) + HCl(aq) ⟶ CH3NH3+(aq) + Cl-(aq)To determine the pH at the equivalence point of this reaction, we first need to calculate the moles of methylamine and HCl used;Moles of CH3NH2 = M × V = 0.230 M × V = MV molesMoles of HCl = M × V = 0.230 M × V = MV molesAt the equivalence point, the moles of HCl will be equal to the moles of methylamine. Therefore, MV = MV. Solving for V gives;V = 1 LTo calculate the pH at the equivalence point, we first need to calculate the moles of methylamine that reacted with HCl. At the equivalence point, all the methylamine has reacted and has been converted to CH3NH3+;Moles of CH3NH3+ formed = Moles of CH3NH2 used = 0.230 M × 1 L = 0.230 molWe can now calculate the concentration of CH3NH3+ in the solution, which is equal to 0.230 M.Using the Kb of methylamine, we can calculate the concentration of OH- ions at equilibrium;Kb = [CH3NH2][OH-]/[CH3NH3+]5.0 × 10-4 = x2/0.230 - xSolving for x gives;x = 7.95 × 10-3 MThe concentration of OH- ions is 7.95 × 10-3 M. Using the concentration of OH-, we can calculate the pOH of the solution;pOH = -log(OH-) = -log(7.95 × 10-3) = 2.10The pH of the solution can be determined using the pH + pOH = 14;pH = 14 - pOH = 14 - 2.10 = 11.9Therefore, the pH at the equivalence point is 11.9.For the indicator pKa, the color change is observed when the pH of the solution is equal to pKa of the indicator. At the equivalence point, the pH of the solution is 11.9. We need an indicator that changes color around a pH of 11.9. An example of such an indicator is phenolphthalein. The pKa of phenolphthalein is around 9.4. Therefore, the pKa of the indicator is 9.4.For the color of the indicator in a solution with pH = 6, we can use the table of acid-base indicators. At a pH of 6, the color of phenolphthalein is colorless. Therefore, the color of this indicator in a solution with pH = 6 is colorless.

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O2- Option B is correct

Explanations:

Calcium atom is a group 2 elements that gives out two electrons in order to form a stable configuration and a Ca2+ ion. These two electrons are transferred to an atom that required two electrons to complete its outer shell.

Since oxygen required 2 electron to attain its octet configuration, hence they can easily accepts the two electrons from calcium atoms to form CaO which is composed of Ca2+ and O2- ions in the ratio of one Ca2+ ion to one O2− ions.

If phosphorus with 15 neutrons, the mass number of an isotope of phosphorus is 31.

Isotopes are two or more types of atoms that have the same atomic number and position on the periodic table but differ in the number of nucleons due to the different number of neutrons in the nucleus.

An isotope is one of two or more atomic types of a chemical element that have the same atomic number and position on the periodic table and nearly identical chemical behavior, but different atomic masses and physical properties.

If two atoms have different numbers of protons, they are different elements. However, two atoms with the same number of protons and different number of neutrons are called isotopes. Two terms used to identify nuclides isotopes are atomic number and mass number.

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The increase in pressure when a basketball is pumped up is caused by the change in the number of molecules (optionC).

When air is pumped into a basketball, the air molecules are forced into a smaller space, which increases the number of molecules in that space. This increase in the number of molecules leads to an increase in the pressure of the gas within the ball.To better understand why this is the case, we can use the ideal gas law, which describes the behavior of gases under various conditions. The ideal gas law is expressed as PV = nRT, where P is pressure, V is volume, n is the number of molecules, R is the gas constant, and T is temperature.
When air is pumped into a basketball, the volume of the ball remains the same (assuming the ball is rigid and does not expand), and the temperature of the air inside the ball does not change significantly. Therefore, according to the ideal gas law, the only way the pressure can increase is if the number of molecules (n) increases.
This increase in pressure is what makes the ball bouncy and allows it to be used for games and activities. It is important to note that overinflating a basketball can lead to a rupture or bursting of the ball due to the excessive pressure created by the increased number of molecules.

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The volume/molarity of a solution can be calculated using the following expression;

CaVa = CbVb

Where;

According to this question, the volume/molarity of each question can be calculated thus

QUESTION 1:

4.93 × V = 4.68 × 243.32

4.93V = 1,138.7376

V = 230.98mL

QUESTION 2:

65.26 × 0.93 = 50 × C

60.6918 = 50C

C = 1.21 M

QUESTION 3:

molarity = no of moles ÷ volume

molarity = 2.14 mol ÷ 4.81L

molarity = 0.445 M

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A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol, the black balls in the model represent the two carbon atom.

Alcohols are organic compounds made of the elements' hydrogen (H), oxygen (O), and carbon (C). Alcohol with 2 carbons is referred to as ethanol (also known as ethyl alcohol). Beer, wine, and liquor all include the kind of alcohol known as ethanol.

Ethanol molecules have two carbon atoms apiece. Additionally, this implies that there are two moles of carbon for every mole of ethanol.

Three-dimensional models known as ball and stick models use colored spheres to represent atoms and sticks to indicate bonds between the spheres. Different colors are used to symbolize specific atoms; for instance, black is typically used to represent carbon and white to represent hydrogen.

Thus,  in a ball-and-stick model of a molecule of ethanol, the black balls in the model represent the two carbon atom.

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Answer:

Student A

Explanation:

In order to have a scientific experience that is successful you need to have experiments number 1

Answer: Its A!

Explanation:

I hope i helped, have a wonderful day!

Answer:

the answer is stimilus!

Explanation:

Answer:

be specific it's too little information

Answer:

The standard solution is a solution of known concentration that can be used to titrate a solution of unknown concentration.

Moles of Hg

2 moles produce 1 mol O2

1 mol produces 1/2mol O_2

0.006 mol produces

im not so sure but I think the answer is 8. Sorry if im wrong‍

Answer:

\(M_{2}O\)

Explanation:

Anything oxide is a compound with oxygen, and since oxygen is -2, it requires two of the metal's +1 to make it zero

In other words:

2(+1) + (-1) = 0

Answer:

Covalent bond

Explanation:

The sharing amongst atoms leads to the formation of covalent bonds.

Covalent bonds are bonds formed between two or more atoms having zero or very small electronegativity difference. Such bonds exists in the molecules of non-metals.

Each of the atom tends to share the valence electrons in their outer energy levels to be able to mimic the noble gas structure. For the formation of this bond type, each of the atom requires odd or unpaired electrons.

Answer:

When matter interact with EMR then spectrum is obtained. We can understand both spectra using Bohr's hydrogen spectrum. let's have a look on Bohr's hydrogen spectrum what does it say. It says when a electron gains energy it moves from one energy level to other(lower to higher) which is Absorption phenomenon. When the electrons returns from excited state to ground state they emits several spectral lines. this spectrum is called as emission spectrum. inshort the

Emission spectrum is spectrum of electromagnetic radiations that were emitted from the higher energy state(Excited state) to lower energy state(Ground state). and study of emission spectrum is known as AES (Atomic Emission spectroscopy).

When an atom or ion is subjected to EMR, it absorbs certain level of radiations, and when this absorbed energies are studied under spectroscopy they are plotted as absorption spectrum, and study of Absorption spectrum is known as AAS (Atomic Absorption spectroscopy).

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When a ground state hydrogen atom absorbs a photon of light having a wavelength of 92.6 nm, the final state of the hydrogen atom is the excited state.

The hydrogen atom has only one electron, which is located in the ground state or the first energy level. When a photon of light of 92.6 nm wavelength is absorbed, the electron gains energy and jumps to the higher energy level, which is the second energy level (n = 2).

Thus, the final state of the hydrogen atom is the excited state or the second energy level. The energy absorbed by the electron is equal to the energy of the photon. The energy of a photon is given by the formula: Energy of a photon = hc/λwhere,h = Planck's constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s λ = wavelength of the photon

Substituting the given values, we get

Energy of a photon = (6.626 x 10⁻³⁴ J.s x 3 x 10⁸ m/s) / (92.6 x 10⁻⁹ m)

Energy of a photon = 2.14 x 10⁻¹⁸ J. The energy absorbed by the electron is equal to the energy difference between the two energy levels.

The energy of an electron in the nth energy level of the hydrogen atom is given by the formula: E_n = (-2.18 x 10⁻¹⁸ J) / n² where, E_n = energy of electron in nth energy level

Substituting n = 1 (ground state), we get: E₁ = (-2.18 x 10⁻¹⁸ J) / (1)²   E₁= -2.18 x 10⁻¹⁸ J

Substituting n = 2 (excited state), we get: E₂ = (-2.18 x 10⁻¹⁸ J) / (2)²  E₂ = -0.545 x 10⁻¹⁸ J

The energy absorbed by the electron is the difference between the energy of the electron in the excited state and the energy of the electron in the ground state.

ΔE = E₂ - E₁

ΔE = (-0.545 x 10⁻¹⁸ J) - (-2.18 x 10⁻¹⁸ J)ΔE = 1.64 x 10⁻¹⁸ J

Since the electron gains energy, the energy absorbed by the electron is positive. Therefore, the final state of the hydrogen atom is the excited state.

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The duration of the ATP-PC system is 0-20 seconds, and the pathway utilized during the ATP-PC system is Anaerobic.

The ATP-PC system or phosphagen system is a metabolic pathway that offers energy to the cells for quick and explosive exercises. The ATP-PC system is the quickest way to produce ATP but is also the most limited. It has a duration of 0-20 seconds.

ATP-PC SystemThe ATP-PC system is utilized for activities that require high bursts of energy and quick contractions, such as sprinting, weightlifting, or jumping. This system is anaerobic, meaning it doesn't require oxygen. Creatine phosphate and adenosine triphosphate are stored in the muscle cells and can be converted into ATP when needed. These stored energy sources are rapidly utilized during the ATP-PC system, and ATP is produced from PC (phosphocreatine) breakdown.

ATP-PC system is a non-aerobic (anaerobic) metabolic pathway where PCr (phosphocreatine) is broken down to produce ATP and creatine. This pathway utilizes the muscles' stores of ATP and PCr and can provide energy to muscles for quick, explosive movements. It is not utilized during extended activities that require a low to moderate amount of energy.

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The values of all sub-parts have been obtained.

(a) The 6.04 amol/vescile of epinephrine are in each vesicle.

(b) The 3637892 molecules of epinephrine are in each vesicle.

(c) The volume of a spherical vesicle is V = 3.34 × 10⁻¹⁷ L.

(d) The concentration of epinephrine = 0.30 M.

What is molar concentration.

A chemical species' concentration, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per litre, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used molarity unit in chemistry.

(a) Evaluate that how many attomoles (amol) of epinephrine are in each vesicle?

As given,

1 fmol = 10⁻¹⁵ mol

1 amol = 10⁻¹⁸ mol

Number of attomoles epinephrine:

= 151 fmol × (10⁻¹⁵ mol)/ 1 fmol × 1amol/10⁻¹⁸ mol

= 151000 amol

Number of attomoles of epinephrine in each vescile:

= 151000 amol/2.5 × 10⁴ vescile

= 6.04 amol/vescile.

(b) Evaluate that how many molecules of epinephrine are in each vesicle?

Number of molecules present in 1 mol of epinephrine:

     = 6.04/vescile × [(10⁻¹⁵ mol)/ 1 fmol] × [6.023 × 10²³ molecules/1 mol]

     = 3637892

(c) Evaluate the volume of a spherical vesicle of radius 200 nm.

Radius of spherical vescile is 2.00 × 10⁻⁷ m

Volume of the spherical vescile is,

V = 4/3 πr³

Substitute value of r respectively,

V = 4/3 π(2.00 × 10⁻⁷ )³

V = 3.34 × 10⁻²⁰ m³

V = 3.34 × 10⁻¹⁷ L

(d) Evaluate the molar concentration of epinephrine in the vesicle if it contains 10 amol of epinephrine.

Number of moles epinephrine = 10 amol

= 1.00 × 10⁻¹⁷mol

Volume of the spherical vescile = 3.34 × 10⁻¹⁷ L

Concentration of epinephrine = (1.00 × 10⁻¹⁷mol)/(3.34 × 10⁻¹⁷ L)

Concentration of epinephrine = 0.30 M

Hence, the values of all sub-parts have been obtained.

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The question is incomplete; the complete question is;

Which pair of properties describes the elements in Group 18?

They are chemically stable and liquid at room temperature.

They have eight valence electrons and are flammable.

They are magnetic and boil at low temperatures.

They are gaseous at room temperature and chemically stable.

Answer:

They are gaseous at room temperature and chemically stable.

Explanation:

The group 18 elements are generally called the noble gases or the inert gases. This is because they are mostly monoatomic gases with a high degree of chemical stability.

Recall that group 18 elements already have eight electrons in their outermost shell so they are very stable as a result of a complete octet. They do not easily participate in chemical reactions because of their chemical inertness.

Answer:

Explanation:

A) As temperature is increased, Kinetic energy increases. As KE ∝ velocity, velocity increases, and thus, there will be more frequent collisions.

B) As temperature increases, heat energy applied is converted into kinetic energy. Thus, a greater proportion of particles will have sufficient energy to react, upon colliding.

C) Mass remains constant

Chemical energy in the form of wood or charcoal is transformed into thermal energy (heat) through combustion.

The thermal energy is then transferred to the cooking vessel, heating the food inside and causing various chemical reactions to occur, such as denaturation of proteins and caramelization of sugars.

As the food cooks, the thermal energy is also transferred to the surrounding air, causing it to expand and rise, creating convection currents that help distribute the heat more evenly.

Some of the thermal energy is also lost to the environment through radiation and conduction, which can cause the cooking vessel and surrounding surfaces to become hot to the touch.

nergy is constantly being transformed and transferred in a variety of ways as food is cooked over a fire, resulting in the delicious meals we enjoy.