The identity of an atom can br determined by looking at the number of: protons and neutrons: neutrons: electrons and neutrond protons.​

Answer:  A. 28

If we aren't talking about an isotope, then the number of neutrons and the number of protons in the nucleus are the same. Each proton weighs one atomic unit, and the same can be said about a neutron as well. So half of the weight is from the protons and half is from the neutrons. The electrons are extremely small relative to the protons that their weight is negligible.

When we bring a magnet near the doorbell when it is not connected to the battery, we feel a pull, or an attractive force.

For this the hypothesis can be:

Hypothesis: If there is no permanent magnet in the doorbell, just metal like iron, then when we bring a paper clip to the doorbell, we will observe an attractive force between the paper clip and the doorbell due to the interaction between the magnet and the iron in the doorbell.

Hypothesis: If there is a permanent magnet in the doorbell, then when we bring a paper clip to the doorbell, we will observe a stronger attractive force between the paper clip and the doorbell due to the interaction between the magnet and the metal components (such as iron) in the doorbell.

Thus, these can be the Hypothesis for the given scenario.

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X = 2n, where n is the number οf stereο genic atοms in the mοIecuIe, is the fοrmuIa fοr determining the maximum number οf stereοisοmers.

The fοrmuIa X = 2n cοnsistentIy deIivers the maximum number οf stereοisοmers, but it faiIs tο prοduce the true number in circumstances with great symmetry. If a mοIecuIe cοntains twο stereοcenters, it shοuId have fοur stereοisοmers. If a mοIecuIe cοntains three stereοcenters, it shοuId have nο mοre than eight stereοisοmers.

Thus, fοr a given cοmpοsitiοn, the maximum number οf stereοisοmers is 2n, where n is the number οf chiraI centers. Therefοre there are fοur structuraI isοmers and fοur stereοisοmers. As a resuIt, οptiοn 'D' is the right answer. Chain isοmerism is a sοrt οf structuraI isοmerism in which the cοmpοnents οf these isοmers are branched in distinct ways.

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In  which way the Chain isomerism is a sort of structural isomerisam  andd what are the components of these isomers ?

True. The reaction of HCl(aq) and NaOH(aq) to form NaCl(aq) and H2O(l) is an example of a reaction that is classified as exothermic, meaning that it releases heat.

This release of heat is due to the breaking of bonds in the reactants, which requires energy, and the formation of new bonds in the products, which releases energy.

The entropy of the system is increased by the release of heat and the additional movement of particles, since the products are in a more disorganized state than the reactants. Therefore, the entropy change (ΔS) for the reaction is positive.

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Answer:

TiCl2

Explanation:

Mass of the chloride of titanium= 1.31 g

Mass of titanium= 0.528 g

Therefore mass of chlorine = 1.31-0.528 = 0.782 g

To determine the empirical formulae of the titanium chloride, divide the mass of each element by its relative atomic mass and divide through by the lowest ratio.

Ti- 0.528/48 = 0.011, Cl- 0.782/35.5 = 0.022

Ti- 0.011/0.011 , Cl- 0.022/0.011

Ti- 1, Cl-2

Hence the required empirical formula is TiCl2

Answer:

Dark matter and dark energy raise some of the biggest questions in the study of space and physics. Lots of scientists are using observations and math to figure out what these are. This will help us understand more about our amazing universe, where there is always more to discover and more to learn.

Some of the most important concerns in the study of space and physics are raised by dark matter and dark energy. Many scientists are utilizing math and observations to determine what they are.

Dark matter is a part of the cosmos that can only be detected by its gravitational pull, not by its brightness. The universe's matter-energy ratio is made up of 30.1 percent dark matter, 69.4 percent dark energy, and "regular" visible matter (0.5 percent).

The existence of dark matter also referred to as the "missing mass," was first suggested by Swiss-American astronomer Fritz Zwicky, who found that the mass of all the stars in the Coma cluster of galaxies only made up about 1% of the mass required to prevent the galaxies from escaping the cluster's gravitational pull in 1933.

Until the 1970s, when American astronomers Vera Rubin and W. Kent Ford observed a similar phenomenon, the existence of this missing mass was unknown. At that time, the mass of the stars visible in a typical galaxy was only about 10% of the mass needed to keep those stars orbiting the galaxy's center.

Generally speaking, the rate at which stars circle the galactic nucleus is independent of how far away from the nucleus they are; in fact, orbital velocity either remains constant or slightly rises with distance instead of decreasing as would be predicted.

This requires a linear relationship between the mass of the galaxy inside the orbit of the stars and their separation from the galaxy's centre. However, this interior material emits no visible light, thus the term "dark matter."

Therefore, many scientists are utilizing math and observations to determine what they are.

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Answer:

electrolyte

Explanation:

Answer:Skeletal muscle can undergo hypertrophy, as each cell gets bigger.

Explanation:

Answer:

Sperm cells and egg cells don't go through mitosis.

Explanation:

Answer:

N have 8 13 neutrons.

Explanation:

Nitrogen-15      Nitrogen-20

     8                             13

Half life for remaining 5 days is 80. e-0.25 .

Half life period is the time needed by a radioactive substances to transform into a different substance. It is the interval of time required for the one half of the atomic nuclei of a radioactive sample to decay. Half life is calculated by finding the decay constant of a substance then dividing it by 2. Decay constant of a radioactivity is probability of decay per unit time.

Here half life 32P is 5 days.

The concentration of the radioactive isotope is the total amount of radioactivity per unit volume. The expression for calculating concentration of radioactive isotope  at half life is ,

    [A] = [A] e-kt

t1/2= 0.693/K

K= 0.693/ t1/2=0.05days

Now substituting value of K and t in the expression

[A]= [A]e-kt

    = 80 .e-0.25

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1. The limiting reagent is sulfur trioxide, SO₃ and the excess reagent is water, H₂O

2. The mass of the excess reagent leftover is 14.92 g

3. The mass of sulfuric acid, H₂SO₄ is produced is 8.06 g

The limiting and excess reagent can be obtained as follow:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted with 18 g of H₂O

Therefore,

6.58 g of SO₃ will react with = (6.58 × 18) / 80 = 1.48 g of H₂O

From the above calculation, we can see that only 1.48 g of H₂O out of 16.4 g is needed to react completely with 6.58 g SO₃.

Thus, the limiting reagent is SO₃ and the excess reagent is H₂O

The mass of the excess reagent leftover can be obtained as follow:

Mass of excess reagent, H₂O leftover = Mass given - mass reacted

Mass of excess reagent, H₂O leftover = 16.4 - 1.48

Mass of excess reagent, H₂O leftover = 14.92 g

The mass of H₂SO₄ produced can be obtained as illustrated below:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

6.58 g of SO₃ will react to produce = (6.58 × 98) / 80 = 8.06 g of H₂SO₄

Thus, the mass of H₂SO₄ produced is 8.06 g

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To calculate the freezing point of a solution, we need to use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (a property of the solvent),

m is the molality of the solution.

First, let's calculate the molality of the solution:

Molar mass of Zn(SO4) = 161.47 g/mol

Mass of Zn(SO4) = 85.23 g

Mass of water = 1.225 kg = 1225 g

Moles of Zn(SO4) = Mass / Molar mass

= 85.23 g / 161.47 g/mol

= 0.5276 mol

Molality (m) = Moles of solute / Mass of solvent (in kg)

= 0.5276 mol / 1.225 kg

= 0.4308 mol/kg

Now, we need the cryoscopic constant for water. The cryoscopic constant for water is approximately 1.86 °C/m.

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 0.4308 mol/kg

ΔTf = 0.800 °C

Therefore, the freezing point depression of the solution is 0.800 °C. To find the freezing point, subtract this value from the freezing point of pure water, which is 0 °C.

Freezing point = 0 °C - 0.800 °C

Freezing point = -0.800 °C

Thus, the freezing point of the solution is approximately -0.800 °C.

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Answer:

The final pressure is approximately 0.78 atm

Explanation:

The original temperature of the gas, T₁ = 263.0 K

The final temperature of the gas, T₂ = 298.0 K

The original volume of the gas, V₁ = 24.0 liters

The final volume of the gas, V₂ = 35.0 liters

The original pressure of the gas, P₁ = 1.00 atm

Let P₂ represent the final pressure, we get;

\(\dfrac{P_1 \cdot V_1}{T_1} = \dfrac{P_2 \cdot V_2}{T_2}\)

\(P_2 = \dfrac{P_1 \cdot V_1 \cdot T_2}{T_1 \cdot V_2}\)

\(P_2 = \dfrac{1 \times 24.0 \times 298}{263.0 \times 35.0} = 0.776969038566\)

∴ The final pressure P₂ ≈ 0.78 atm.

From highest to lowest atomic radius:

Potassium > Lithium > Carbon > Boron > Fluorine.

Atomic number is the number of protons found in the nucleus of an atom, which determines the element and its unique properties. It is denoted by the symbol "Z" and is listed in the periodic table of elements along with the element's symbol, name, and atomic mass.

The nucleus is the central core of an atom, composed of protons and neutrons, which are collectively known as nucleons. It is located at the center of the atom and contains almost all of its mass. The number of protons in the nucleus determines the identity of the atom and is referred to as the atomic number. The nucleus is held together by the strong nuclear force, which is one of the four fundamental forces of nature.

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Answer:

Blue Whale

Explanation:

I hope this helps:)

Answer:

The blue whale!

Explanation:

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

m is the mass

f is the force

From the question

mass = 3.5 kg

force = 35 N

We have

\(a = \frac{35}{3.5} \\ = 10\)

We have the final answer as

Hope this helps you

The correct statements that illustrate how a deuterium isotope effect relates to an E2 reaction mechanism are:

A deuterium isotope effect refers to the difference in reaction rate observed when hydrogen atoms (H) are replaced by deuterium atoms (D) in a reaction. In E2 (elimination, bimolecular) reactions, the rate-determining step involves the simultaneous formation of a new pi bond and the breaking of a C-H or C-D bond.

The deuterium isotope effect arises due to the difference in the bonding strength between hydrogen and deuterium. If a deuterium isotope effect is observed, it indicates that the breaking of a C-H or C-D bond is involved in the rate-determining step. This suggests that the bond being broken contributes significantly to the overall reaction rate. Options 1 and 2 are correct.

Which of the following statements illustrate how a deuterium isotope effect relates to an e2 reaction mechanism? (Select all that apply.)

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At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

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Answer:

The question is very complicated. In the liquid you should be able to see the solid. Anyway here is your answer. Hope it helps!

Explanation:

Mixing of Substances:

Many types of solids will dissolve into liquids under the right conditions. Certain factors will speed up the process of dissolving, including stirring the substance and heating it.

Answer and Explanation:

When a solid dissolves into a liquid, a solution is made. This happens because the solid is made up of particles that will come apart, or dissociate, in the liquid. It will appear that the solid has disappeared into the liquid, when in fact, its particles are still there. For example, salt (NaCl) easily dissolves in water. From a chemistry standpoint, it does so because the salt molecules separate into their charged ions once in the water. The ions become attracted to the slightly charged water molecules, making them stay in the solution. This process can be reversed. If the water is evaporated, the salt ions will come back together to form NaCl molecules.

The balanced equation for the given mixture is the following.

BaCl2 + Na2CO3 → BaCO3(s) + 2 NaCl

now, calculate the no of moles of each BaCl2 and Na2CO3

(65 mL) x (0.3 M BaCl2) = 0.0195 mol BaCl2

(60 mL) x (0.35 M Na2CO3) = 0.021 mol Na2CO3

0.0195moles of BaCl2 is reactin completely with 0.021moles of Na2CO3, but we have more Na2CO3 present than BaCl2, so Na2CO3 is in excess and BaCl2 is the limiting reactant.

Therefore,

(0.0195 mol BaCl2) x (1 mol BaCO3 / 1 mol BaCl2) x (197.3359 g/mol) = 3.85 g BaCO3.

197.3359 g/mol is the molar mass of the BaCO3.

A precipitate is a solid formed in a chemical reaction other than one of the reactants. This can occur when solutions containing ionic compounds are mixed to form an insoluble product. The identity of precipitates can often be determined by examining solubility rules. Mass is preserved during the precipitation reaction. No matter what changes occur, the total mass of matter contained remains the same. The mass of the product is the same as the mass of the reactants in a chemical reaction.

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The approximate date of the next full moon after January 2 would be around January 9 or 10.

The approximate date of the next full moon after January 2, which is a third quarter moon, can be determined by understanding the lunar cycle. The lunar cycle, also known as the moon's phases, takes approximately 29.5 days to complete.

The cycle starts with the new moon, then progresses through the waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and finally the waning crescent before returning to the new moon.

Since January 2 is a third quarter moon, we can estimate the remaining days in the lunar cycle until the next full moon. The third quarter moon marks the transition from the waning gibbous to the waning crescent phase, which is about 3/4 of the way through the lunar cycle.

From the third quarter moon, there are still the waning crescent, new moon, waxing crescent, first quarter, and waxing gibbous phases to go through before reaching the full moon. These phases take approximately 1/4 of the lunar cycle, which is about 7 to 8 days.

Taking this into consideration, the approximate date of the next full moon after January 2 would be around January 9 or 10.

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The reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction

Elimination reactions are those that proceed by the removal of one or more atoms or functional groups from the reactants, resulting in the formation of a new double bond or π bond in a product. An example of an elimination reaction is the dehydration of alcohols.In this particular reaction, 2-methyl-2-pentanol (an alcohol) reacts with sulfuric acid to produce 2-methyl-2-pentene, which is an alkene.

The reaction mechanism proceeds via an elimination reaction, where the OH group and a hydrogen ion (H+) are removed from the reactant, resulting in the formation of a double bond between the adjacent carbon atoms in the product.The reaction can be represented as follows:CH3C(CH3)2CH(OH)CH3 + H2SO4 → CH3C(CH3)2C=CH2 + H2O + H2SO4In conclusion, the reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction.

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The final volume of the oxygen gas is 756 ml. To find the final volume of the oxygen gas, we can use the combined gas law equation, which relates the initial and final temperatures, pressures, and volumes of a gas. Since the pressure is constant, we can simplify the equation to:

(V1/T1) = (V2/T2)

where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.

Substituting the given values, we get:

(545 ml / 308 K) = (V2 / 424 K)

Solving for V2, we get:

V2 = (545 ml / 308 K) * 424 K = 756 ml

Therefore, the final volume of the oxygen gas is 756 ml.

It's important to note that the container is mentioned to be able to "contract or expand", which suggests that it's flexible and can adjust its volume to accommodate changes in pressure or temperature. However, the question does not specify any information about the container's behavior, so we assume it's ideal and has no effect on the gas. Also, we assume that the oxygen gas behaves like an ideal gas and follows the ideal gas law, which may not be true under certain conditions or at high pressures.

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The substances in the list can be used to write a complete combustion reaction are:

To write a complete combustion reaction, we need a fuel (usually a hydrocarbon or carbon-based compound) and an oxidizing agent (typically oxygen). Based on the provided list of chemical substances, the following substances can be used to write a complete combustion reaction:

Al (aluminum)

O₂ (oxygen)

H₂O (water)

CO₂ (carbon dioxide)

These substances can be combined to form a complete combustion reaction. For example, the reaction between aluminum (Al) and oxygen (O2) can result in the formation of aluminum oxide (Al₂O₃):

4 Al + 3 O₂ → 2 Al₂O₃

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Answer:

B) number of electrons

Explanation:

The two species:

          K+   and Cl- have the same number of electrons.

A neutral atom of K has 19 electrons

A neutral atom of Cl has 17 electrons

Now,

 To form K+, K will have to lose an electron and then the number of electrons becomes 18

To form Cl-, Cl will have to gain an electrons and then the number of electrons becomes 18

So, therefore, the number of electrons on both species is 18

The [OH⁻] of the solution : 1 x 10⁻¹¹ M

Given

[H30) : 1 x 10-3 M.

Required

the [OH]

Solution

The water equilibrium constant is a product of the concentrations of [H3O +] and [OH-]

Kw = [H₃O⁺] [OH⁻]

Input the value of  [H₃O⁺]

1 x 10⁻¹⁴ = 1 x 10⁻³ x  [OH⁻]

[OH⁻] = 1 x 10⁻¹⁴ :  1 x 10⁻³

[OH⁻] = 1 x 10⁻¹¹ M