Write a nuclear equation for the fusion of two h−2 atoms to form he−3 and one neutron.

Answer:

Explanation:

The nucleus of an atom is consituted by protons and neutrons. The electrons are out of (surrounding) the nucleus.

The elements are uniquely identified by the atomic number, which is the number of protons.

Since, the mass of the electrons is barely 1 / 1840 times the mass of the protons or neutrons, the mass of the atoms is approximated to the mass of protons and neutrons. The relative mass of neutrons and protons is practically 1.

So, the mass number of an atom is the sum of the protons and neutrons.

The symbols and equation used are:

Hence, to calculate the number of neutrons, N, you solve from that equation:

Which means that to calculate the number of neutrons you subtract the atomic number from the mass number.

To calculate the number of neutrons in an atom, subtract the atomic number (number of protons) from the mass number (total number of protons and neutrons). You can find these numbers on the periodic table for each element.

In order to calculate the number of neutrons in an atom, you must subtract the atomic number from the mass number. The atomic number (Z) represents the number of protons in an atom's nucleus and defines the identity of that atom. For instance, an atom with six protons is the element carbon with the atomic number 6. The mass number (A), on the other hand, is the total number of protons and neutrons in an atom. So, the formula to calculate the number of neutrons is A - Z = number of neutrons.

For example, let's take the element Fe (Iron). Iron has an atomic number of 26, indicating it has 26 protons. Its atomic mass is typically around 56. To find the number of neutrons, simply subtract the atomic number from the mass number: 56 - 26 = 30. Therefore, a typical atom of iron has 30 neutrons.

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What does q stand for?

Answer : The 'q' for this reaction is, 328 J

Explanation :

First we have to calculate the moles of [tex]NaOH[/tex] and [tex]NaHCO_2[/tex].

[tex]\text{Moles of }NaOH=\text{Molarity of }NaOH\times \text{Volume of solution}=0.200mole/L\times 0.04L=0.008mole[/tex]

[tex]\text{Moles of }NaHCO_2=\text{Molarity of }NaHCO_2\times \text{Volume of solution}=0.100mole/L\times 0.2L=0.02mole[/tex]

From this we conclude that, the moles of [tex]NaOH[/tex] are less than moles of [tex]NaHCO_3[/tex]. So, the limiting reactant is, NaOH.

Now we have to calculate the 'q' for this reaction.

The balanced chemical reaction will be,

[tex]OH^-+HCO_3^-\rightarrow CO_3^{2-}+H_2O[/tex]

The expression used for 'q' of this reaction is:

[tex]q=n(\Delta H_f^o\text{ of product})-n(\Delta H_f^o\text{ of reactant})[/tex]

[tex]q=n[(\Delta H_f^o\text{ of }CO_3^{2-})+(\Delta H_f^o\text{ of }H_2O)]-n[(\Delta H_f^o\text{ of }HCO_3^-)+(\Delta H_f^o\text{ of }OH^-)][/tex]

where,

n = number of moles of limiting reactant = 0.008 mole

At room temperature,

[tex]\Delta H_f^o\text{ of }CO_3^{2-}[/tex] = -677 kJ/mole

[tex]\Delta H_f^o\text{ of }H_2O[/tex] = -286 kJ/mole

[tex]\Delta H_f^o\text{ of }HCO_3^-[/tex] = -692 kJ/mole

[tex]\Delta H_f^o\text{ of }OH^-[/tex] = -230 kJ/mole

Now put all the given values in the above expression, we get:

[tex]q=0.008mole[(-677kJ/mole)+(-286kJ/mole)]-0.008mole[(-692kJ/mole)+(-230kJ/mole)][/tex]

[tex]q=0.328kJ=328J[/tex]      (conversion used : 1 kJ = 1000 J)

Therefore, the 'q' for this reaction is, 328 J

Answer:

Explanation:

1) Data:

a) V = 75.0 liter

b) n = 15.82 mol

c) p = 546.8 kPa

d) T = ?

2) Formula:

Where:

3) Solution:

a) Solve the equation for T:

b) Substitute and compute:

(since the volume is expressed with 3 significant figures, the answer must show also 3 significant figures)

C) The higher number of molecules increases the number of collisions that will occur with the reactants.

Hope this helps!!

Increasing the concentration of a solution leads to a higher rate of reaction due to an increased number of collisions between the reactant molecules.

The correct statement that explains why the rate of reaction increases when the concentration of a solution is increased is option C) The higher number of molecules increases the number of collisions that will occur with the reactants.

When the concentration of a solution increases, there are more particles of the reactants in the same volume. This means that there are more molecules available to collide with each other, leading to an increased chance of successful collisions and a higher rate of reaction.

For example, if you have a solution containing a high concentration of hydrochloric acid and you add more reactant particles, such as magnesium chips, to the solution, there will be more collisions between the hydrochloric acid molecules and the magnesium particles, resulting in a faster reaction.

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Hello!

Your answer is “e”

Electronegativity of an atom is it's ability to attract electrons during bond formation.

Answer: Option (E) is the correct answer.

Explanation:

Electronegativity is defined as the ability of an atom to attract electrons towards itself while formation of bond.

For example, chlorine is electronegative in nature and hence it will readily combine with potassium atom as potassium has one extra electron in its valence shell.

                        [tex]K + Cl \rightarrow KCl[/tex]

Thus, we can conclude that electronegativity of an atom is its ability to attract electrons during bond formation.

Final answer:

A base is a compound that increases the concentration of hydroxide ions (OH-) in aqueous solution, according to the Arrhenius definition, which also states an acid increases the concentration of hydrogen ions (H+) in an aqueous solution.

Explanation:

A compound which contributes hydroxide ions (OH-) or increases the OH- concentration when dissolved in water is called a base. This definition aligns with the Arrhenius theory, formulated in 1884 by Svante Arrhenius. According to the Arrhenius definition, an acid is a substance that increases the concentration of hydrogen ions (H+) in an aqueous solution, while a base is a substance that increases the concentration of hydroxide ions in an aqueous solution.

An Arrhenius base is typically recognized by its ability to dissociate and release OH- ions into the solution, which can raise the pH level, making the solution more basic. For example, when sodium hydroxide (NaOH) is dissolved in water, it dissociates into Na+ and OH- ions, thereby increasing the hydroxide ion concentration in the solution.

Answer:

Explanation:

A chemical element is a pure substance formed by atoms with the same atomic number (number of protons). This is because it is the number of protons what identifies an element.

For example: oxygen is a chemical element, so oxygen is formed by only atoms of oxygen, and the atomic number of those atoms is 8, because every oxygen atom has 8 protons.

Nevertheless, some atoms of oxygen, may have different number of neutrons. Isotopes are different kind of atoms of the same element, which only differ in the number of neutrons. So, some atoms of oxygen will have 8 neutrons, other 9 neutrons, and other 10 neutrons (those are the stable isotopes of oxygen).

That difference in neutrons, is generally accepted that, does not modifiy substantially the chemical properties of the element, but the mass number. So, the isotopes with more neutrons wil be heavier, and the isotopes with less neutrons will be lighter.

In general a chemical element is formed by a mixutre of isotopes of the same element.

Answer:

its B :diffrent number of neutrons

Explanation:

Answer  they are all true.

Explanation:

The Unabomber had no identity until he finally confessed in 1998. Therefore, the answer is true, (its almost like a trick question.)

The Polygraph machine does measure physical changes in the body, so the answer is true.

False positives are when the examinee tells a truth but it is recorded as a lie.

im not sure wow super hard question

Can you please send me whole question picture to better assist you.

Thank you

Answer:

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

Explanation:

Answer:

344.02 g.

Explanation:

no. of moles (n) = mass/molar mass

no. of moles Al(OH)₃ = 4.41 mol & molar mass of Al(OH)₃ = 78.01 g/mol.

∴ mass = no. of moles * molar mass = (4.41 mol)*(78.01 g/mol) = 344.02 g.

Answer:

To control what substances enter and leave the cell

Explanation:

The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.

Answer:

To control what substances enter and leave the cell

Explanation:

Answer:

92.4 grams.

Explanation:

CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,

1.0 mole of CaCO₃ reacts with 2.0 moles of HCl to produce 1.0 mole of CaCl₂, 1.0 mole of CO₂, and 1.0 mole of H₂O.

no. of moles of CaCO₃ = mass/molar mass = (104 g)/(100.08 g/mol) = 1.039 mol.

Using cross multiplication:

1.0 mole of CaCO₃ produce → 1.0 mole of CaCl₂.

∴ 1.039 mole of CaCO₃ produce → 1.039 mole of CaCl₂.

∴ The amount of CaCl₂ produced = no. of moles x molar mass = (1.039 mol)(110.98 g/mol) = 114.3 g.

∵ percent yield of the reaction = [(actual yield)/(theoretical yield)] x 100.

Percent yield of the reaction = 80.15%, theoretical yield = 115.3 g.

∴ actual yield = [(percent yield of the reaction)(theoretical yield)]/100 = [(80.15%)/(115.3 g)] / 100 = 92.42 g ≅ 92.4 g.

They are called earth alkali metals. Elements in groups 3 through 12 have many useful properties and are called transition metals. Elements in group 17 are known as “salt formers”. They are called halogens.

mark me brainliest please!

Group 17 elements, known as halogens, include fluorine, chlorine, bromine, iodine, and astatine. Derived from Greek for "salt forming," they are highly reactive and commonly found in nature as halide salts.

The elements in Group 17 are known as the halogens, a term derived from the Greek words for "salt forming." They include fluorine, chlorine, bromine, iodine, and astatine. Halogens have a distinctive chemical property; they react readily with metals to form compounds like sodium chloride and calcium chloride. Because of their reactivity with alkali metals and alkaline earth metals, they can form a wide range of halide salts.

The elements of Group 17 are characterized by having the general electron configuration ns²np⁵ with seven valence electrons, making them highly reactive as they are one electron short of having a full outer shell. While these elements do not occur freely in nature due to their reactivity, they are abundantly found as halide salts such as those in the mineral fluorspar, which consists mainly of calcium fluoride.

To calculate the equilibrium constant at 25°C for the given reaction, use the information from the standard reduction potentials given in the question. Write the half-reactions and use the Nernst equation to calculate the cell potential. Then, calculate the equilibrium constant using the relation ΔG = -RTlnK.

To calculate the equilibrium constant at 25°C for the given reaction, we need to use the information from the standard reduction potentials given in the question. We can first write the half-reactions for the species involved in the reaction:

Then, we can use the Nernst equation to calculate the cell potential for the reaction:

E = E0 - (0.0592/n) * log(Q)

Where:

By calculating the cell potential and using the equation ΔG = -nFEcell, where ΔG is the change in Gibbs free energy, F is Faraday's constant, and Ecell is the cell potential, we can then calculate the equilibrium constant K using the relation ΔG = -RTlnK.

By substituting the values into the equations and calculating, we can find the equilibrium constant for the given reaction at 25°C.

Final answer:

To calculate the equilibrium constant for a redox reaction, one must balance the half-reactions, find the standard potentials for both, and then use these values with the Nernst equation and the relationship between free energy and the equilibrium constant.

Explanation:

To calculate the equilibrium constant at 25 °C for the redox reaction given, we need to use the standard reduction potentials of each half-reaction. First, we balance the half-reactions for each species involved.

For MnO⁴⁻ reduction to Mn²⁺:

MnO⁴⁻(aq) + 8H⁺⁺(aq) + 5e⁻ → Mn²⁺(aq) + 4H₂O(l)

For Cl⁻ oxidation to Cl₂:

2Cl⁻(aq) - 2e⁻ → Cl₂(g)

After balancing, we use the Nernst equation to find the standard cell potential (E° cell) by subtracting the standard reduction potential of the anode (E° anode) from the cathode (E° cathode).

E° cell = E° cathode - E° anode

Then, the equilibrium constant (K) is related to the standard cell potential by the following equation, where n is the number of moles of electrons transferred and F is the Faraday constant:

ΔG° = -nFE° cell

And the standard free energy change (ΔG°) is related to the equilibrium constant (K) by the equation:

ΔG° = -RTlnK

Combining these equations and solving for K gives us:

lnK = nFE° cell / RT

By using the standard reduction potentials from the appendix and plugging in the values for n, F, R (the universal gas constant), and T (temperature in Kelvin), we can calculate K.

This approach allows us to understand the spontaneity and the composition of the equilibrium mixture for the reaction in question, providing valuable insights into the chemical process at equilibrium.

Answer:

Explanation:

The law of partial pressures states that, in a mixture of gases, the total pressure of the mixture is equal to the sum of the individual pressures of each gas, as if each gas were alone in the mixture.

So:

Answer:

D. 0.60 L.

Explanation:

The no. of millimoles of acid is equal to that of the base at the neutralization.

∴ (XMV) NaOH = (XMV) H₂SO₄.

X is the no. of reproducible H⁺ (for acid) or OH⁻ (for base),

M is the molarity.

V is the volume.

X = 1, M = 4.0 M, V = ??? L.

X = 2, M = 4.0 M, V = 0.3 L.

∴ V of NaOH = (XMV) H₂SO₄/(XM) NaOH = (2)(4.0 M)(0.3 L)/(1)(4.0 M) = 0.6 L.

So, the right choice is: D. 0.60 L.

Summer because the seasons in the Southern Hemisphere is the opposite of the seasons in the northern hemisphere.

Answer:

Rb, Na, Al, N, F

Explanation:

Rb has an EN of 0.8, Na with 0.9 EN, Al with 1.5 EN, N with 3.0 EN, and F with 4.0 EN.

The elements Rb, F, Al, N, and Na are arranged in order of increasing electronegativity as Rb < Na < Al < N < F. Fluorine is the most electronegative while Rubidium is the least.

Electronegativity is a measure of the ability of an atom to attract electrons. In general, electronegativity increases from left to right across a period and decreases down a group in the periodic table. Based on this trend, the elements Rb, F, Al, N, and Na can be arranged in order of increasing electronegativity as follows: Rb < Na < Al < N < F. It's important to note that Fluorine (F) is the most electronegative element on the periodic table, followed by Nitrogen (N). Al (Aluminum), Na (Sodium), and Rb (Rubidium) are less electronegative as you go from right to left and down the periodic table.

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The elements Rb, F, Al, N, and Na are arranged in order of increasing electronegativity as Rb < Na < Al < N < F. Fluorine is the most electronegative while Rubidium is the least.

Electronegativity is a measure of the ability of an atom to attract electrons. In general, electronegativity increases from left to right across a period and decreases down a group in the periodic table. Based on this trend, the elements Rb, F, Al, N, and Na can be arranged in order of increasing electronegativity as follows: Rb < Na < Al < N < F. It's important to note that Fluorine (F) is the most electronegative element on the periodic table, followed by Nitrogen (N). Al (Aluminum), Na (Sodium), and Rb (Rubidium) are less electronegative as you go from right to left and down the periodic table.

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Answer: The rock formed from cooling lava.

Explanation:Extrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust.

A geologist concludes that a rock sample is an extrusive igneous rock.The rock formed from cooling lava is accurate.

A geologist concludes that a rock sample is an extrusive igneous rock.The rock formed from cooling lava is accurate.

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Answer:

Explanation:

Following Avogadro's principle, under ideal condtions, the volume of the gases at the same conditions of temperature, and pressure, is proportional to the number of molecules.

Then, you can calculate the number of molecules for each of the gases to determine which is the sample with the greatest number of molecules and, hence, which will have the greatest volume at STP (standard temperature and pressure).

The formula to calcualte the number of molecules (in moles) is:

Then, since the mass is the same (22 g) for the four options, the result will be dependent on the molar mass: the gass witht the smallest molar mass will give the largest number of moles for 22 g, and will have the  greatest volume.

a) 22 g CO:

b) 22 g He:

c) 22 g O₂

d) 22 g Cl₂

Conclusion: since He has the smallest molar mass, the sample of 22 g of He gas will have the greatest volume at STP.

All the given samples, i.e., CO, He, O2, and Cl2, each having a mass of 22 grams would occupy the same volume at standard temperature and pressure (STP) due to Avogadro's Law. Each of these samples is equivalent to 0.5 moles and thus, would occupy the same volume.

The volume of a gas at standard temperature and pressure (STP) is determined by the number of moles of the gas, not its mass. This is based on Avogadro's Law which states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.

All of these samples are equivalent to 0.5 moles (given that the molar masses of CO, He, O2, and Cl2 are 28, 4, 32, and 71 g/mol respectively). Therefore, at STP (which is defined as a temperature of 273 K and a pressure of 1 atmosphere), each of these gas samples would occupy the same volume - about 11.2 liters (as a mole of any gas at STP occupies 22.4 liters).

So, the correct answer is that all these samples would have the same volume at STP.

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Answer:

The last option:

Explanation:

1) Word equation

2) Chemical (molecular) equation

3) Ionization reactions

Write the dissociation of the soluble ionic compounds:

4) Total ionic equation:

5) Net ionic equation

You must cancel the spectator ions, which are those ions that are repeated in both reactant and product sides, i.e. NO₃⁻. They are name spectator because they do not participate (change) during the reaction.

And that is the last choice of the list.

A chemical equation that depicts the aqueous electrolytes as dissociated ions is an ionic equation.  The ionic equation is shown by [tex]\rm NH_{3} (aq) + H^{+} (aq) \rightarrow NH_{4}^{+} (aq).[/tex]

The ionic equation is the depiction of the ions of the compounds or the substances involved in the reaction.

The word equation for the aqueous ammonia with nitric acid can be shown as,

[tex]\text{Ammonia (aq) + nitric acid} \rightarrow \text{Ammonium nitrate (aq)}[/tex]

Its molecular reaction can be shown as,

[tex]\rm NH_{3} (aq) + HNO_{3} (aq) \rightarrow NH_{4} NO_{3}[/tex]

The dissociation of the ions can be shown as,

[tex]\rm HNO_{3} \rightarrow H^{+} + NO_{3}^{-}[/tex]

[tex]\rm NH_{4} NO_{3} \rightarrow NH_{4}^{+} + NO_{3}^{-}[/tex]

The total ionic reaction will be,

[tex]\rm NH_{3} (aq) + H^{+} (aq) + NO_{3}^{+}(aq) \rightarrow NH_{4}^{+}(aq) + NO_{3}^{-} (aq)[/tex]

The total net ionic reaction can be shown as,

[tex]\rm NH_{3} (aq) + H^{+} (aq) \rightarrow NH_{4}^{+} (aq)[/tex]

Therefore, option D. [tex]\rm NH_{3} (aq) + H^{+} (aq) \rightarrow NH_{4}^{+} (aq)[/tex] is the net ionic reaction.

Learn more about the ionic reactions here:

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the hard shell off the egg

Answer: D

Answer:

[tex]\boxed{x = 10}[/tex]

Explanation:

This is like an empirical formula question, except that you are finding the molar ratio of compounds instead of atoms.

Step 1. Gather the information in one place.

M_r:                                            142             18

           Na₂SO₄·xH₂O(s) ⟶ Na₂SO₄(s) + xH₂O(g)

m/g:              3.22                      1.42

Step 2. Calculate the mass of the water

Mass of H₂O = mass of Na₂SO₄·xH₂O – mass of Na₂SO₄

= 3.22 – 1.42 = 1.80 g

Step 3. Calculate the moles of each product

Na₂SO₄: [tex]n = \text{1.42 g} \times \dfrac{\text{1 mol}}{\text{142 g}} = \text{0.0100 mol}[/tex]

     H₂O: [tex]n = \text{1.80 g} \times \dfrac{\text{1 mol}}{\text{18 g}} = \text{0.100 mol}[/tex]

Step 4. Calculate the molar ratios

[tex]\dfrac{\text{moles of Na$_{2}$SO$_{4}$}}{\text{moles of H$_{2}$O}} = \dfrac{0.0100}{0.100} = \dfrac{1}{10}[/tex]

[tex]\boxed{x = 10}[/tex] , so the formula of the compound is Na₂SO₄·10H₂O

Answer:

[tex]\boxed{\text{C. 11.2 L}}[/tex]

Explanation:

The pressure is constant, so we can use Charles' Law to calculate the volume.

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

Data:

V₁ = 22.4 L; T₁ = 273.15 K

V₂ = ?;         T₂ = 136.58 K

Calculations:

[tex]\dfrac{ 22.4}{273.15} = \dfrac{ V_{2}}{136.58}\\\\0.082 00 = \dfrac{ V_{2}}{136.58}\\\\V_{2} =0.082 00 \times 136.58 = \boxed{\textbf{11.2 L}}[/tex]

Temperature is a measurement of heat whereas heat is just an energy.

With that being said the heat is moving from hot to cold.

Answer:

Explanation:

So let's define both of these . these are two different things

Temperature : it's average kinetic energy of the particles within the system .

So if I increase the motion of particles ,the temperature will increase . If I decrease the motion of particles ,the temperature will decrease

Heat : it is the flow of energy due to temperature difference .

If I have a metal strip and I heat one side of it and the other side is cold then due to temperature difference ,heat will flow from the heated part of the metal strip to cold part of the strip.

------------------

Heat only provides a direction of the flow of heat while temperature is just the average kinetic energy of the substance ( it has no direction .BUT here are some more differences :

Heat is measured by a device called caloriometer

Temperature is measured by Thermometer

Unit of heat : joules

Unit if temperature : Kelvin

Answer:

Air masses move and meet

Explanation:

The formation, movement, and collision of the air masses is one of the biggest and most noticeable changer of the weather conditions, be it locally, regionally, or globally. The air masses are constantly on the move, with the basic rule being - the heavier, denser air masses move toward the less dense, lighter air masses. Once they come in contact, the denser, heavier air masses push upward or backward the less dense, lighter air masses. The properties of the air masses depend on the place they have formed, so they can be dry, wet, cold, warm, and they are able to change the weather conditions literary in several minutes.

Answer:

Air masses move and meet

Explanation:

hydrogen ions

H2SO4

HNO3

H3PO4

etc

Answer:

818.2 g.

Explanation:

M = (no. of moles of NaCl)/(Volume of the solution (L))

M = 2.0 M.

no. of moles of NaCl = ??? mol,

Volume of the solution = 7.0 L.

∴ (2.0 M) = (no. of moles of NaCl)/(7.0 L)

∴ (no. of moles of NaCl) = (2.0 M)*(7.0 L) = 14.0 mol.

no. of moles of NaCl = mass/molar mass

∴ mass of NaCl = (no. of moles of NaCl)*(molar mass) = (14.0 mol)*(58.44 g/mol) = 818.2 g.

Answer:

Explanation:

The reaction given follows this pattern:

1) Decomposition reaction:

2) First-order kinetic with respect to MN and first-order overall:

                       [tex]ln\frac{[MN]}{[MN]_0}=-kt[/tex]

                               t = τ

 ∴ τ =  ln(2) / k ⇒ k = ln (2) / τ =  ln(2) / 2.3 × 10⁴ s / ln(2) = 3.0 × 10⁻⁵ s⁻¹

The rate constant for a first-order reaction can be calculated using the half-life of the reaction. In this case, the rate constant for the given reaction at 25°C is 3.0 × 10⁻⁵ s⁻¹.So,option c is correct.

The rate law for a first-order reaction is given by: Rate = k[reactant]

The half-life of a first-order reaction can be calculated using the formula: t1/2 = 0.693 / k

Given that the half-life of the reaction is 2.3 × 10⁴s and it is first order overall, the rate constant can be calculated as k = 0.693 /[tex]t_{ 1/2}[/tex] = 0.693 / 2.3 × 10⁴ = 3.0 × 10⁻⁵ s⁻¹.