(1 Point)
How many atoms are there in 3.33 moles of strontium?

The standard free energy of formation (ΔG°f) is the energy change that occurs when one mole of a compound is formed from its constituent elements in their standard states.

When ΔG°f equals zero, it means that the compound is in a state of thermodynamic equilibrium, where the reactants and products have equal energy. However, identifying the compound with ΔG°f equal to zero from the given options (NaI(s), H2(g), O3(g), and NO(g)) is difficult as it depends on various factors such as temperature, pressure, and the method used for the calculation.

The values of ΔG°f can vary significantly based on these factors, and it is possible for none of the given options to have ΔG°f equal to zero. It is hard to determine the compound with the standard free energy of formation equal to zero from the given options. The explanation is that ΔG°f depends on multiple factors and can vary significantly, making it difficult to identify a compound with certainty.

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Answer:

all metals are good conductor of thermal energy and electricity.

If metals are deposited in streambeds placer mining would probably be used. spoil bank mining open-pit mining placer mining strip mining underground mining

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Answer: F

Explanation:

Yes, infrared (IR) spectroscopy can be used to distinguish 2-pentanone from other compounds.

IR spectroscopy is a technique that measures the absorption of infrared radiation by molecules, providing information about the functional groups present in a compound. 2-pentanone, also known as methyl propyl ketone, has a carbonyl functional group (C=O) due to the presence of the ketone moiety. The carbonyl group in 2-pentanone typically absorbs infrared radiation in the range of 1700-1750 cm^-1.

By comparing the IR spectrum of an unknown compound with a reference spectrum or a database of known spectra, one can identify characteristic absorption bands associated with 2-pentanone. The specific absorption peak at around 1700-1750 cm^-1, corresponding to the carbonyl group, can be used as a distinctive feature to distinguish 2-pentanone from other compounds.

However, it is important to note that the interpretation of IR spectra should consider the entire spectrum and not solely rely on a single peak or band. Different functional groups and molecular structures can contribute to the overall spectrum, providing additional information for compound identification.

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The speed of a wave can be calculated using this formula:

v = f x λ

Where:

v is the wave speed in metres per second, m/s

f is the frequency in hertz, Hz

λ (lambda) is the wavelength in metres, m

Calculation:

Given:

f = 20 Hz

λ = 100m

Using the equation:

v = f x λ

v = 20 x 100

v = 2000 m/s

Therfore, the speed of the wave is 2000 m/s

A sound wave has a wavelength of 100 m and a frequency of 20 Hz. The wave's speed is 2× 10^3 m/s.

assuming frequency = 20 Hz and wavelength = 100 m

utilized concept: v= = 20×100 = 2×10³ m/s

The frequency in physics is the quantity of waves passing a fixed location in a unit of time. It also indicates how many cycles or vibrations a body in periodic motion experiences in a given unit of time.

A sort of energy created by vibrations is sound. The molecules of the air surrounding an item vibrate as a result.. These molecules vibrate because they collide with nearby molecules, which also vibrate as a result.

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Greater than zero and equivalent to the pace at which the reaction is going in the opposite direction

It is stated that the system was in equilibrium before any \(C_{2}H_{5}CO_{2}CH_{3}\) was taken out of it or put back in. This indicates that the rate of consumption of reactants and the rate of creation of products are both larger than zero and equal. Since these rates are equal, it follows that both the forward and backward reactions are taking place at these rates.

Chemical equilibrium refers to the situation in a chemical reaction where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties.

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Answer:

the heat differs to the air as heat is energy and energy likes to travel

Answer:

6 neutrons

Explanation:

6 neutrons

Boron having an atomic number of 5 means that it will have 5 protons. 11 atomic mass units in total. Neutrons also have a atomic mass unit of 1. So there are 6 neutrons

amount of time the two substances are in contact. area in contact between the two substances. specific heat of the material that makes up the substances. the density of the two substances in contact.

The characteristics determine how easily two substances change temperature is amount of time the two substances are in contact, area of contact between the two substances, specific heat of the material that makes up the substances and the density of the two substances in contact. Therefore, option B, C, D and E are correct.

When two substances that have different surface temperatures come in contact, conduction happens. The substance with the higher temperature always transfers energy to the one with the lower temperature.

When two objects with different temperatures come in contact with one another, energy moves from the hotter (higher temperature) object to the cooler (lower temperature) object until both objects reach the same temperature.

The latitude of the location has an impact on the air temperature there. The location's elevation. separation from the ocean.

Thus, option B, C, D and E are correct.

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The percent of potassium in the compound KClO₃ = 32%

Proust states the Comparative Law that compounds are formed from elements with the same Mass Comparison, so that compounds have a fixed composition of elements

\(\tt \%mass=\dfrac{Ar~element\times number~of~element~in~compound}{MW~compound}\times 100\%\)

We determine the molecular mass of KClO₃ then we determine the Ar from K (potassium) and the amount in the compound

MW KClO₃ : 122,55 g/mol

The amount of K in KClO₃ = 1

So %K :

\(\tt =\dfrac{39}{122,55}\times 100\%=31.8\%\approx 32\%\)

Answer:

100 percent  heterozygous and 0 percent of white rabbits

Explanation:

it would be 100%

hope that helped :)

Answer:

The subscript next to the letter "C" will always tell you the number of carbon atoms.

The partial pressure of the hydrogen gas collected in this way is 710 mmHg. When collecting a gas over water, the total pressure of the system includes the vapor pressure of water at that temperature

When collecting a gas over water, the total pressure of the system is the sum of the partial pressure of the gas and the vapor pressure of water at that temperature. In this case, the total pressure is given as 742 mmHg, and the vapor pressure of water at 30°C is 31.8 mmHg.

To find the partial pressure of the hydrogen gas, we need to subtract the vapor pressure of water from the total pressure. Therefore, the partial pressure of the hydrogen gas can be calculated as:

Partial pressure of hydrogen gas = Total pressure - Vapor pressure of water

Partial pressure of hydrogen gas = 742 mmHg - 31.8 mmHg

Partial pressure of hydrogen gas = 710 mmHg

In this chemical reaction, the collected hydrogen gas exerts a partial pressure of 710 mmHg.

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Balance the equation :

8H₃PO₄  +   24(NH₄)₂MoO₄  +   24HNO₃  ----->  8(NH₄)₃PO₄×24MoO₃  +                                                                                  

                                                                                    24NH₄NO₃+ 24H₂O

The given reaction :

H₃PO₄  +   (NH₄)₂MoO₄  +   HNO₃  ----->  (NH₄)₃PO₄×12MoO₃  +                                                                                  

                                                                                    NH₄NO₃+ H₂O

now sperate the reactant and product and count the no. of each element

Reactant                                    Product

H - 4                                             NH₄ - 4

PO₄ - 1                                          PO₄ - 1

NH₄ - 2                                         Mo - 12

Mo - 1                                            O - 4

O - 4                                             NO₃ - 1

NO₃ - 1                                          H - 2

compare the coefficient ,

multiply 12 to NH₄MoO₄ We get

H₃PO₄  +   12(NH₄)₂MoO₄  +   HNO₃  ----->  (NH₄)₃PO₄×12MoO₃  +                                                                                  

                                                                                    NH₄NO₃+ H₂O

now, we have 24 NH₄ on the left side and 3 on right side, multiply 8 we get

H₃PO₄  +   12(NH₄)₂MoO₄  +   HNO₃  ----->  8(NH₄)₃PO₄×12MoO₃  +                                                                                  

                                                                                    NH₄NO₃+ H₂O

now look at PO₄ , we have 1 on left side and 8 on right side , multiply 8 in H₃PO₄, and compare coefficient, we get

8H₃PO₄  +   24(NH₄)₂MoO₄  +   24HNO₃  ----->  8(NH₄)₃PO₄×12MoO₃  +                                                                                  

                                                                                    24NH₄NO₃+ 24H₂O

now compare the coefficient , the equation is now balance

Thus, Balance the equation :

8H₃PO₄  +   24(NH₄)₂MoO₄  +   24HNO₃  ----->  8(NH₄)₃PO₄×24MoO₃  +                                                                                  

                                                                                    24NH₄NO₃+ 24H₂O

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The correct answer is:

Keq<1, ΔG∘>0

When a system is at equilibrium, the forward and reverse reactions occur at equal rates. At this point, the concentrations of the reactants and products do not change over time. The equilibrium constant (Keq) is a measure of the relative concentrations of the reactants and products at equilibrium.

If the reactants are more abundant at equilibrium, it means that the equilibrium lies towards the side of the reactants. This suggests that the value of Keq is less than 1, since the ratio of products to reactants is low. Additionally, a positive ΔG∘ (standard free energy change) indicates that the reaction is not spontaneous in the forward direction, meaning that energy must be added to the system to proceed in that direction.

Therefore, the correct statement is: Keq<1, ΔG∘>0.

It's important to note that this answer assumes standard conditions (25°C, 1 atm pressure, and 1 M concentration). At different temperatures and concentrations, the values of Keq and ΔG∘ may change.

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Answer:

2150 mmHg ( 1 atm / 760 mmHg ) ( 101.325 kPa / 1 atm ) = 286.643 kPa

Therefore, the closest value from the choices is the second one which has the value of 287, this would be answer.

Explanation:

I stole diss from someone else so Im juss hopin iss right

Answer:

B on EDG

Explanation:

Vapor pressure, boiling point, specific gravity, appearance, and odor are some of the physical properties of a material. The correct option is C.

Physical properties are characteristics that can be observed or measured without changing the identity of the substance.

What are physical properties? Physical properties of a material are properties that can be measured or observed without changing the chemical identity of the substance. They include features such as mass, color, density, boiling point, melting point, solubility, odor, texture, and other characteristics that describe the substance's appearance, texture, or behavior.

Physical properties of a substance can be used to help identify it, compare it to other substances, or determine how it might behave under specific conditions. Physical properties are also used to classify materials into categories such as metals, non-metals, and metalloids. For example, the physical properties of gold (a metal) are different from those of sulfur (a non-metal), and this is reflected in their appearance, density, and other characteristics.

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The time taken for the decomposition to occur is  109 hours.

When we are told that the reaction is a decomposition this implies tat the process would follow the first order kinetics as we can see in the question.

Initial pressure of the pure gas = 600. mmHg or 0.79 atm

Final pressure of the system =  1.000 atm

Final pressure of the pure gas =  1.000 atm - 0.79 atm = 0.21 atm

We now have;

0.693/\(t_{\frac{1}{2} }\) = 2.303/t log Po/P

\(t_{\frac{1}{2} }\)  half life of the system

t = time taken

Po = initial pressure of the pure gas

P = final pressure of the pure gas

Then;

0.693/ 8.75 = 2.303/t log 0.79/0.21

0.0792 = 8.66/t

t =  8.66/0.0792

t = 109 hours

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Answer:

177.3kg C₂₁H₄₄

Explanation:

Based on the chemical reaction:

C₂₁H₄₄ → 3C₂H₄ + C₁₅H₃₂

Where 1 mole of C₂₁H₄₄ produce 3 moles of ethene, C₂H₄.

To solve this question we need to determine the moles of ethene in 50.4kg. 1/3 these moles are the moles of C₂₁H₄₄ that must be added:

Moles Ethene -Molar mass: 28.05g/mol-

50.4kg = 50400g * (1mol / 28.05g) = 1796.8 moles of ethene

Moles C₂₁H₄₄:

1796.8 moles of ethene * (1 mol C₂₁H₄₄ / 3 mol C₂H₄) = 589.93 moles C₂₁H₄₄

Mass C₂₁H₄₄:

589.93 moles C₂₁H₄₄ * (296g / mol) = 177283g =

Hydrogen breaks down relatively fast in the atmosphere. In the presence of sunlight, hydrogen breaks down within a few years. However, in the absence of sunlight, it can take up to a decade (10 years) for hydrogen to break down in the atmosphere.

Hydrogen is the first element in the periodic table with the symbol H. It is the most abundant element in the universe, but it is rarely found in its elemental form on Earth. It is often found combined with other elements such as oxygen and carbon. Hydrogen is a colorless, odorless, and highly flammable gas. It is used in a variety of applications, such as fuel for vehicles, electricity production, and chemical manufacturing.

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Hydroboration of terminal alkynes yields aldehydes.

Here's a step-by-step explanation:

1. Terminal alkynes are reacted with a borane reagent (such as BH₃) in a process called hydroboration.
2. During hydroboration, the borane adds across the triple bond of the terminal alkyne in a syn addition, resulting in the formation of an organoborane intermediate.
3. The organoborane intermediate is then oxidized with hydrogen peroxide (H₂O₂) and a hydroxide ion (OH⁻) in a process called oxidation.
4. This oxidation step converts the organoborane intermediate into an aldehyde functional group.

So, the correct answer is (c) aldehyde.

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The hydroboration of terminal alkynes yields an aldehyde. During the hydroboration process

boron and hydrogen are added across the carbon-carbon triple bond of the alkyne, which yields an unstable intermediate. This intermediate quickly reacts with water to form an aldehyde.

It is important to note that the product of the hydroboration of an alkyne can be influenced by the reaction conditions and the substituents present on the alkyne. However, for a terminal alkyne, the product is typically an aldehyde.

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The electron pair arrangement around the central atom in SF2 is C. tetrahedral.

Using the VSEPR (Valence Shell Electron Pair Repulsion) model, the electron pair arrangement around the central atom in SF2 can be determined by considering the number of bonding pairs and lone pairs on the central atom. In SF2, the central atom is sulfur (S), which is surrounded by two fluorine (F) atoms.

Sulfur has six valence electrons, and it forms two bonds with the fluorine atoms, utilizing four of its valence electrons. The remaining two valence electrons form a lone pair on the sulfur atom. Thus, there are two bonding pairs and one lone pair around the central sulfur atom.

According to the VSEPR model, electron pairs repel each other and arrange themselves in a way that minimizes repulsion. In the case of SF2, the two bonding pairs and one lone pair around the central sulfur atom lead to a bent molecular geometry. The electron pair arrangement that corresponds to this molecular geometry is tetrahedral.

Hence, the electron pair arrangement around the central atom in SF2, based on the VSEPR model, is C. tetrahedral.

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Answer: C

Explanation:

Answer:

0.43 g/ml

Explanation: Density is d = M/V, where d is density, M is mass, and V is volume: therefore d= 32 g/75ml = 0.4266 = 0.43 g/ml

The answer is B - The properties of atoms of the same element can be different. This is not a part of Dalton's atomic theory. According to Dalton's atomic theory, all matter is composed of indivisible atoms, compounds form when atoms combine in whole number ratios, and an atom can neither be created nor destroyed.
Your answer: B - The properties of atoms of the same element can be different.

This statement is not a part of Dalton's atomic theory, as according to his theory, atoms of the same element have the same properties.

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The [OH⁻] of a basic solution with a pOH of 6.09 can be found by using the equation: pOH = -log[OH⁻].
To solve for [OH⁻], we can rearrange the equation to get:
[OH⁻] = 10^(-pOH)
Plugging in the given pOH value, we get:
[OH⁻] = 10^(-6.09)
[OH⁻] = 8.13 x 10^(-7) M

The [OH⁻] of the basic solution is 8.13 x 10^(-7) M.  The pOH of a solution is related to the hydroxide ion concentration ([OH⁻]) by the equation:

pOH = -log[OH⁻]

Therefore, to find the [OH⁻] in the solution, we can rearrange the equation as:

[OH⁻] = 10^(-pOH)

Substituting the given value of pOH = 6.09, we get:

[OH⁻] = 10^(-6.09)

[OH⁻] = 7.99 x 10^(-8) M

Therefore, the hydroxide i   on concentration in the basic solution is 7.99 x 10^(-8) M.

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The [OH⁻] of a basic solution with a pOH of 6.09 can be found by using the equation: pOH = -log[OH⁻].

To solve for [OH⁻], we can rearrange the equation to get:

[OH⁻] = 10^(-pOH)

Plugging in the given pOH value, we get:

[OH⁻] = 10^(-6.09)

[OH⁻] = 8.13 x 10^(-7) M

Therefore, the [OH⁻] of the basic solution is 8.13 x 10^(-7) M.  The pOH of a solution is related to the hydroxide ion concentration ([OH⁻]) by the equation:

pOH = -log[OH⁻]

Therefore, to find the [OH⁻] in the solution, we can rearrange the equation as:

[OH⁻] = 10^(-pOH)

Substituting the given value of pOH = 6.09, we get:

[OH⁻] = 10^(-6.09)

[OH⁻] = 7.99 x 10^(-8) M

Therefore, the hydroxide i   on concentration in the basic solution is 7.99 x 10^(-8) M.

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Answer:

Due its storing and holding ability.

Explanation:

It matter that the material from which the vat is made is metal because this vat is used for storing and holding liquids. Vat is a large container or tank that is used for storing or holding liquids in industrial sector. This vat is made of metal which increases its strength and durability. If the vat is made of wood or plastic so it can't hold huge amount of liquid or chemical due to its weak material so that's why it matters that the substance from which the vat is made is metal or not.