A decomposition reaction has a rate constant of 0.0012 yr⁻¹.(a) What is the half-life of the reaction?

Mass of NaCl : 5.85 g

Given

5.3 g Sodium carbonate (Na₂CO₃)

Required

Mass of NaCl

Solution

Reaction

Na₂CO₃ + 2HCl ⇒ 2NaCl + H₂O + CO₂

mol of Na₂CO₃ (MW=106 g/mol) :

= mass : MW

= 5.3 g : 106 g/mol

= 0.05

From the equation, mol ratio Na₂CO₃ : NaCl = 1 : 2, so mol NaCl :

= 2/1 x mol Na₂CO₃

= 2/1 x 0.05

= 0.1

Mass of NaCl (MW=58.5 g/mol) :

= mol x MW

= 0.1 x 58.5

= 5.85 g

Skewed to the right will be best describes the shape of the chi-square distribution when the degrees of freedom is less than 10. Option B is correct.

When the degrees of freedom are less than 10, the shape of the chi-square distribution is generally not symmetric. The specific shape of the distribution depends on the degrees of freedom.

For low degrees of freedom, the chi-square distribution tends to be skewed to the right. This means that the distribution has a longer right tail and the majority of the data is concentrated towards the lower values. As the degrees of freedom increase, the skewness decreases and the distribution approaches a more symmetric shape.

Hence, B. is the correct option.

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--The given question is incomplete, the complete question is

"which of the following best describes the shape of the chi-square distribution when the degrees of freedom are less than 10 ? A) Unimodal and symmetric B) Skewed to the right C) Skewed to the left D) Uniform E) Bimodal."--

The work for the compression process is 3719.3 J.

What is ideal gas law ?

The ideal gas is the virtual gas that chemists and students dream of because it would be much simpler if there weren't some kind of intermolecular force that would complicate the simple law of the ideal gas. An ideal gas is essentially a point cloud moving with constant random linear motion. Its behavior is described by the assumptions described in the kinetic molecular theory of gases. This ideal gas definition contrasts with the non-ideal gas definition. This is because this equation describes how gases actually behave. First, let us consider the ideal gas. The ideal gas law is simply a combination of all the simple gas laws (Boyle's law, Charles' law, Avogadro's law), and if you learn this law, you've learned them all. . The simple gas law can always be derived from the ideal gas equation.

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Answer:

C

Explanation:

I'd assume it would be C because the two electrons present in the l = 2 subshell (p) are degenerate. As a result the energy needed to remove an electron in a lower subshell (l=1) would be substantially different compared to the other subshell.

The electron configuration that corresponds to the valence electrons of an element for which there is an especially large jump between the second and third ionization energies is ns^2.

The valence electron configuration of an atom refers to the arrangement of electrons on the outermost shell of the atom.

Recall that a large jump in ionization energy occurs when electrons are removed from inner shells of the atom.

If we study our options closely, we will discover that option A has only two electrons in the valence shell (ns^2).

This means that the third ionization energy involves removing electrons from an inner shell which leads to large jump.

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The percent ionization of acid in a solution which has an initial concentration of acid ha of 1.1 m will be 2.42%

% ionization = \(\frac{concentration of ionized acidX100}{initial concentration of acid}\)

We can calculate the concentration of unionized acid using this expression

Ka = \(\frac{H3O^{+}[K^{-} ] }{HA}\), here Ka is dissociation constant, \(H3O^{+}\) is concentration of hydronium ions, \(A^-}\) is conjugate base concentration, [HA] is acid concentration

Given [HA] = 1.1 M, and concentration of hydronium ion is 7.5 × \(10^{-3}\)

Since acid is monoprotic so, \(H3O^{+}\) = \(A^{-}\)

Solving for Ka,

Ka = 5.102 × \(10^{-6}\)

Now, equilibrium constant expression can be used to find ionized acid concentration

\(A^{-}\) = 2.66 ×\(10^{-4}\)

Now percent ionization of acid can be calculated

% ionization  = 100% × \(\frac{A^{-} }{HA}\) = 2.42 %

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Answer: 0.68% is the correct answer

The suggest units for each case are, respectively:

a) The distance between Chicago and Saint Louis - Kilometer.

b) The size of your bedroom - Meter.

c) The dimensions of this textbook - Centimeter.

d) The thickness of a hair - Micrometer.

Reminder - Question is incomplete, the complete statement is described below:

"The fundamental SI unit of length is meter. However, we often deal with larger or smaller length or distances for which multiplies or fractions of the fundamental units are more useful. For each of the following situations, suggest what fraction or multiple of the meter might be the most appropriate measurement:

a) The distance between Chicago and Saint Louis.

b) The size of your bedroom.

c) The dimensions of this textbook.

d) The thickness of a hair."

We can determine if a Unit is either a Multiple or a Fraction by using the following formula:

\(\frac{Q_{u}}{Q_{r}} = 10^{n}\) (1)

Where:

\(Q_{u}\) - Used unit, in meters.

\(Q_{r}\) - Reference unit, in meters.

\(n\) - Unit-to-unit factor, no unit.

A Measure has a Multiple of the Fundamental Unit if and only if \(n> 0\), and it is a Fraction of the Fundamental Unit if and only if \(n < 0\).

Now we proceed to analyze each case:

a) The distance between Chicago and Saint Louis - The Kilometer is the most common unit to measure Distance between Cities. A Kilometer has a Unit-to-unit factor of 3, representing a Multiple of the Meter.

b) The size of your bedroom - The Meter is the most common unit for Housing and Buildings. A Meter has a Unit-to-unit factor of 0, representing the Fundamental Unit itself.

c) The dimensions of this textbook - The Centimeter is the most common unit for dimensions of Books. A Centimeter has a Unit-to-unit factor of -2, representing a Fraction of the Meter.

d) The thickness of a hair - The Micrometer is the most common unit for the Thickness of a Hair. A Micrometer has a Unit-to-unit factor of -6, representing a Fraction of the Meter.

Then, the suggest units for each case are, respectively:

a) The distance between Chicago and Saint Louis - Kilometer.

b) The size of your bedroom - Meter.

c) The dimensions of this textbook - Centimeter.

d) The thickness of a hair - Micrometer.

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The percent activity of the radioactive isotope cobalt-60 remaining after 2 half-lives IS 25%

The percent activity of a radioactive isotope remaining after a certain number of half-lives can be calculated using the following formula:

Percent Activity Remaining = (1/2)^(Number of Half-Lives) * 100

In this case, we are given that 2 half-lives have passed.

Number of Half-Lives = 2

Let's calculate the percent activity remaining:
Percent Activity Remaining = (1/2)^(2) * 100

= (1/4) * 100

= 25%

Therefore, the percent activity of the radioactive isotope cobalt-60 remaining after 2 half-lives is 25%.

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Hi! I'd be happy to help with your question regarding sodium bicarbonate during a reaction workup. Sodium bicarbonate solution is often added during a reaction workup to neutralize any acidic impurities present in the organic layer, which in turn aids in their removal.

When sodium bicarbonate (NaHCO₃, aq) reacts with an acidic impurity, it forms water (H₂O, l), carbon dioxide (CO₂, g), and sodium salt of the corresponding acid (NaX, aq, where X is the anion of the acid). The overall reaction can be written as:

NaHCO₃ (aq) + HX (org) → NaX (aq) + H₂O (l) + CO₂ (g)

The products, water, and carbon dioxide, are formed in the aqueous phase, while the sodium salt (NaX) remains dissolved in the aqueous layer. This separation allows for the organic layer to be easily extracted, effectively removing acidic impurities from the reaction mixture.

To summarize:
1. Sodium bicarbonate is added to neutralize acidic impurities.
2. The reaction between sodium bicarbonate and an acidic impurity forms water, carbon dioxide, and sodium salt.
3. The products separate into different layers, allowing for the removal of impurities from the organic layer.

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The tendency of a polymer to crystallize decreases with increasing molecular weight. This is because as the chain length increases, it becomes more difficult to align along adjacent chains to produce a regular arrangement of atoms.

Polymer is a material or substance made up of repeating units called a monomer.The monomer represent the molecule type where it has the capability for chemically the bond along with the other molecules with respect to the long chain. While the polymer should represent the chain of the non-specified the no of monomers.

Therefore, The tendency of a polymer to crystallize decreases with increasing molecular weight is because as the chain length increases, it becomes more difficult to align along adjacent chains to produce a regular arrangement of atoms.

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The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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Charles’ Law

V₁/T₁=V₂/T₂

78.5/318.15=V₂/273.15

V₂=67.4 ml

Answer:

When the frozen popsicle sitting outside in the Sun is exposed to warm air, energy will travel between the popsicle and the warm air as follows;

1) Convection current

Heat will be gained by the frozen popsicle by coming into contact with fresh warm air as the air flows around the popsicle while the cooling of the warm air will cause the water vapor in the air to condense and form the visible mist

In turn the popsicle will gain heat resulting in melting of the ice

2) Conduction

As the some of the mist from the air settles on the popsicle, they share their heat resulting further melting of the popsicle

3) Radiation

Radiated heat energy from the Sun is absorbed by the popsicle resulting in the melting of the popsicle

Explanation:

Answer: Sunlight

Explanation:

According to Goog|e, "In addition to assisting in the development of heat within the structure, glass in greenhouses assists in the management of light within the greenhouse. The glass allows light to be transmitted from the sun to the plants within the structure, allowing the plants to grow properly."

I hope this helps!

The lifting force on an airplane's wing  Increases with speed.

The lifting pressure, lifting force, or virtually lift is the sum of all of the forces on a body that forces it to transport perpendicular to the route of flow.

Drag and Thrust are all “mechanical forces.” A mechanical force is generated through the interplay between an item and a fluid (liquid or gas). Weight is a “field force.” A subject's pressure no longer has to be in physical contact with the item to have an impact on the object.

The lift equation states that carry L is identical to the carry coefficient Cl times the density r times half of the velocity V squared instances the wing region A. For given air conditions, form, and inclination of the item, we have to decide a value for Cl to determine the raise.

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Answer:

Answer: Nuclear fusion

Explanation:

I think

Answer:

71%

Explanation:

Answer:

Explanation:

A ) Solar Radiation

B ) Evaporation

C ) Transpiration

D ) Condensation

E ) Precipitation

F ) Run Off

G ) Infiltration

H ) Groundwater .

Answer:

Saffi only

Explanation:

I just took the test and that was the correct answer :)

The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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Answer:          

Phosphorus, sulphur and chlorine have 5, 6 and 7 valence electrons respectively. They accept 3, 2 and 1 electrons respectively. It is easier to accept 1 electron than 2 or 2 electrons than 3. Hence, phosphorus is least reactive followed by sulphur and chlorine which is most reactive.

Explanation:

Answer:

B . CO2(g) -----&gt; CO2(l) Entropy canbe decreased only in the cases when liquid is converted to solid and when gas is converted to solid or liquid. The option B is correct.

Answer:

b. CO_2 (g) --> CO_2 (l)

Explanation:

A P E X

Answer:

Explanation:

The graph of an inversely proportional relationship displays a vertical asymptote at the y-axis as the y value increases without bound as x gets closer and closer to zero (but is positive) and decreases without bound as x gets closer and closer to zero (but is negative)and a horizontal asymptote at the x-axis as y gets .

Answer: The graph of an inversely proportional relationship displays a vertical asymptote at the y-axis as the y value increases without bound as x gets closer and closer to zero (but is positive) and decreases without bound as x gets closer and closer to zero (but is negative)and a horizontal asymptote at the x-axis as y gets .

Explanation: I hope this helps UwU

Answer:

V2 = 9.58 Litres.

Explanation:

Given the following data;

Initial volume = 25 L

Initial pressure = 115 kPa

Final pressure = 300 kPa

To find the new volume V2, we would use Boyles' law.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

\( PV = K\)

\( P_{1}V_{1} = P_{2}V_{2} \)

Substituting into the equation, we have;

\( 115 * 25 = 300*V_{2} \)

\( 2875 = 300*V_{2} \)

\( V_{2} = \frac {2875}{300}\)

\( V_{2} = 9.58 \)

V2 = 9.58 L

Therefore, the new volume is 9.58 litres.

The values which describe standard temperature and pressure are 273.15  K and 101.3 kPa. Thus, the correct option is D.

Standard temperature and pressure is defined as a standard set of conditions  that are required for  measurements in experiments which are established  in order to allow comparison between different sets of data.

Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.They are not universally accepted standards but are the ones which are most commonly used.

The values which describe standard temperature and pressure are 273.15  K and 101.3 kPa respectively, thus option D is correct.

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