Mendeleev periodic table was a useful tool because it enables scientists to

159.7 is the correct answer.

You only need to know first is the vapor pressure of water at that boiling point which is ~ 179 mm hg.

 So the (vapor pressure of C2H5I = 760 – 179)

And since you know the molecular weight of H2O which is equal to18 g/mol and the molecular weight of C2H5I = 156 g/mol.

Just apply the equation: 

grams H2O M.W.      H2O × P H2O 

----------------------    = -------------------------- =  28.13 grams C2H5I 

grams C2H5I M.W.   C2H5I × P C2H5I

To determine the weight of ethyl iodide carried over by 1 g of steam during steam distillation, we need to calculate the mole fraction of ethyl iodide in the mixture and multiply it by the weight of the steam.

The boiling point of a solution can be determined using Raoult's law, which states that the vapor pressure of a solvent above a solution is equal to the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. In this case, we are looking for the weight of ethyl iodide carried over by 1 g of steam during steam distillation. Since the mixture of ethyl iodide and water boils at 63.7°C, we know that the vapor pressure of ethyl iodide at 63.7°C is equal to the vapor pressure of steam at that temperature.

To determine the weight of ethyl iodide carried over by 1 g of steam, we need to calculate the mole fraction of ethyl iodide in the mixture. We can use the equation:

mole fraction of ethyl iodide = weight of ethyl iodide / weight of ethyl iodide + weight of water

Once we have the mole fraction of ethyl iodide, we can multiply it by the total weight of the steam (1 g) to find the weight of ethyl iodide carried over.

The density of the substance is found by dividing its mass by its volume. The volume of the substance is determined by the change in the water level in a graduated cylinder when the substance is added. The calculated density of the substance is 2.6 g/cm³.

The density of a substance can be calculated by using the formula: Density = Mass / Volume. In this case, the volume of the substance can be determined by the change in water level in the graduated cylinder when the substance is added. The initial volume is 8.0 cm³, and the final volume is 10.5 cm³. So, the volume of the substance is the difference between the two volumes, which is 2.5 cm³.

The mass of the substance is given as 6.50 g. Now, we can substitute the mass and volume into the formula to find the density: Density = 6.50 g / 2.5 cm³ = 2.6 g/cm³. So, the density of the substance is 2.6 g/cm^3.

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Answer: 4 g/mol

Explanation:

To calculate the rate of diffusion of gas, we use Graham's Law.

This law states that the rate of diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows:

[tex]\text{Rate of diffusion}\propto \frac{1}{\sqrt{\text{Molar mass of the gas}}}[/tex]

Molar mass of neon =  20 g/mol

Molar mass of unknown gas = ?g/mol

For the rate of diffusion of neon to unknown gas (X), we write the expression:

[tex]\frac{Rate_{Ne}}{Rate_{X}}=\sqrt{\frac{M_{X}}{M_{Ne}}}[/tex]

[tex]\frac{4.5}{10.1}=\sqrt{\frac{M_{X}}{20}[/tex]

[tex]{M_{X}}=4g/mol[/tex]

Hence, the approximate molar mass of the unknown gas is 4 g/mol

Potassium is chemically similar to other Group 1 elements (Alkali metals) on the Periodic Table like Lithium, Sodium, Rubidium, Cesium, and Francium due to having comparable electron configurations.

Elements that are chemically similar to potassium are mainly those within the same group (Group 1) on the periodic table. These elements, known as the Alkali metals, have similar chemical behavior due to having one electron in their outermost shell. Examples include Lithium (Li), Sodium (Na), Rubidium (Rb), Cesium (Cs), and Francium (Fr).

This group of elements shares similar properties, such as being silvery and soft, and being highly reactive, especially with water. They also have comparable physical properties such as low densities and low melting points when compared to other metals.

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A dissolved solute raises the boiling point of a solvent.

Final answer:

An atom containing 47 protons, 47 electrons, and 60 neutrons has a mass number of 107, calculated by summing the number of protons and neutrons.

Explanation:

The mass number of an atom is defined as the sum of the number of protons and the number of neutrons within the atom's nucleus. Given an atom with 47 protons, 47 electrons, and 60 neutrons, we can calculate its mass number by adding the number of protons and the number of neutrons:

Mass number = Number of protons + Number of neutrons = 47 + 60 = 107.

Therefore, the atom with 47 protons, 47 electrons, and 60 neutrons has a mass number of 107.

You can find moles of a substance by dividing mass by the molecules molar mass.

Carbon Monoxides Molar mass is 12.0111 (Carbon) + 16.0000 (Oxygen) = 28.0111g/mol. Divide grams by molar mass:

36.55g28.0111=1.305mols

The number of moles of carbon monoxide in 36.55 g can be calculated using the formula of number of moles = mass / molar mass. Applying this formula with the molar mass of carbon monoxide, you will find that there are approximately 1.305 moles of carbon monoxide in 36.55 g.

To find the number of moles in a given mass of a substance, we can use the formula: number of moles = mass of the substance / molar mass of the substance. The molar mass of carbon monoxide (CO) is approximately 28.01 g/mol, which is the sum of the atomic masses of carbon (12.01 g/mol) and oxygen (16.00 g/mol).

Now, plug the given mass of carbon monoxide into the formula: number of moles = 36.55 g / 28.01 g/mol. Solving this calculation, you will find that there is approximately 1.305 moles of carbon monoxide in 36.55 g.

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The families of elements with similar chemical properties are called groups in the periodic table.

The families of elements with similar chemical properties are called groups in the periodic table. Elements in the same group have the same number of valence electrons and therefore exhibit similar chemical behaviors. For example, the alkali metals in Group 1 and the halogens in Group 17 both have similar reactivity due to their respective valence electron configurations.

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Percentage error is a measure of the accuracy of a measurement or calculation, expressed as a percentage relative to the true or accepted value.

Percentage error = ( Experimental value  − True value / True value ) × 100 %

a) Percentage Error of Density Calculation:

Experimental Density = 1.25 g/cm³

True Density = 1.54 g/cm³

Percentage Error= ∣ 1.25−1.54 / 1.54 ∣  × 100 %

                            ≈ 18.83 %

b) Percentage Error of Length Measurement:

Given:

Experimental Length = 0.229 cm

True Length = 0.225 cm

Percentage Error=  ∣ 0.229  − 0.225 cm / 0.225 cm  ∣   × 100 %  

                             = 1.78 %

Therefore, The percentage error in density is 18.83 % and percentage error in length measurement is 1.78 %

Learn more about Error, refer to the link:

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The mass of CO2 produced in the reaction is 17.596 g

The balanced equation for the reaction is:

CaCO3(s) + 2HCl(aq) → H2O(l) + CO2(g) + CaCl2(aq)

To find the mass of CO2 produced, we need to determine the mass of CaCO3 that reacted.

Given that the initial mass of CaCO3 is 11.00 g and the final mass of the solution is 51.04 g, the mass of CaCO3 that reacted is:

Final mass - Initial mass = 51.04 g - 11.00 g = 40.04 g

Since the molar mass of CaCO3 is 100.09 g/mol, we can calculate the moles of CaCO3 that reacted:

Moles = Mass / Molar mass = 40.04 g / 100.09 g/mol = 0.3998 mol

From the balanced equation, we can see that 1 mole of CaCO3 produces 1 mole of CO2. Therefore, the mass of CO2 produced is:

Mass = Moles × Molar mass = 0.3998 mol × 44.01 g/mol = 17.596 g

So, 17.596 g of CO2 was produced in this reaction.

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Final answer:

To determine if a homogeneous liquid is a solution or a pure substance, examine its composition and properties. A homogeneous mixture, such as a solution, has a uniform composition throughout, while a pure substance has a fixed and definite composition. Perform tests like measuring boiling or freezing points to confirm the nature of the liquid.

Explanation:

A sample of a homogeneous liquid can be determined to be a solution or a pure substance by examining its composition and properties.

In a homogeneous mixture, such as a solution, the composition is uniform throughout the mixture. This means that any sample of the liquid will have the same composition as any other sample. On the other hand, a pure substance, which can be either an element or a compound, has a fixed and definite composition.

To determine whether the liquid is a solution or a pure substance, you can perform tests such as measuring its boiling or freezing point. If the liquid has a consistent boiling or freezing point, it indicates that it is a pure substance. If the liquid does not have a fixed boiling or freezing point, it suggests that it is a solution since the different components may have different boiling or freezing points.

Final answer:

The mass percentages of carbon, hydrogen, and oxygen in sucrose (C12H22O11) are approximately 42.11%, 6.48%, and 51.41%, respectively, calculated by determining the molar mass of sucrose and using the molar masses of the individual elements.

Explanation:

To calculate the mass percentages of carbon (C), hydrogen (H), and oxygen (O) in sucrose (C12H22O11), we first need to determine the molar mass of sucrose by summing the molar masses of its constituent elements. The molar masses are 12.01 g/mol for carbon, 1.008 g/mol for hydrogen, and 16.00 g/mol for oxygen.

The molar mass of sucrose is calculated as follows:

Total molar mass = 144.12 g/mol + 22.176 g/mol + 176.00 g/mol = 342.296 g/mol

Next, we calculate the mass percentage for each element:

Therefore, the mass percentages in sucrose are approximately 42.11% carbon, 6.48% hydrogen, and 51.41% oxygen.

To obtain 75.0 grams of nickel from an ore that is 32.6% nickel by mass, one would need to mine approximately 0.230 kilograms of the ore.

The student is asking about the quantity of a nickel ore that would need to be processed to obtain a specific amount of pure nickel. If the ore is 32.6% nickel by mass, one needs to perform a simple calculation by setting up a proportion:

32.6 g ore contains 1 g nickel,

The calculation is as follows:

Multiply the desired quantity of nickel (75.0 g) by 100.

Divide this product by the percentage of nickel in the ore (32.6%).

This gives the mass of the ore required to be:

(75.0 g nickel) × (100/32.6) / 100% = 230 g ore (approximately, using significant figures)

To convert this to kilograms, we know that 1 kg = 1000 g, so:

230 g = 0.230 kg

Therefore, one would need 0.230 kilograms of this nickel ore to extract 75.0 grams of nickel.

One useful way is by metals, nonmetals, and metalloids. (See also The Periodic Table: Families and Periods.) Most of the elements on the periodic table are classified as metals.

Handling dry ice (solid CO₂) and observing gaseous vapor is a physical change called sublimation, where the substance directly transitions from the solid state to the gaseous state without passing through the liquid phase.

The observation of gaseous vapor when handling dry ice (solid CO₂) is a physical change. This is because when dry ice is handled, it bypasses the liquid phase and directly transitions from the solid state to the gaseous state through a process called sublimation. Sublimation is a physical change where a substance converts from a solid to a gas without going through the liquid phase. This is similar to how snow and ice can sublime into water vapor without melting into liquid water.

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The reaction is not given here but we take an example reaction to understand how to calculate moles.

Let the balanced equation for the reaction is
C3H8 (g) + 5 O2 (g) → 3CO2 (g) + 4 H2O (g)

From here 5 moles of oxygen produces 3 moles of carbon dioxide

So 2.5 moles of oxygen produces 2.5/5 x 3 = 0.5 x 3 = 1.5 moles of carbon dioxide

Final answer:

Based on the combustion reaction 2 CO(g) + O₂(g) → 2CO₂(g), 2.5 moles of oxygen gas consumed would produce 5 moles of carbon dioxide.

Explanation:

When 2.5 moles of oxygen gas (O₂) are consumed in their reaction, to determine how many moles of carbon dioxide (CO₂) are produced, we need a balanced chemical equation. A common combustion reaction is 2 CO(g) + O₂(g) → 2CO₂(g), which indicates that for every mole of O₂ consumed, two moles of CO₂ are produced. Thus, if we consume 2.5 moles of O₂, we would typically produce 5 moles of CO₂, as the mole ratio is 1:2 between O₂ and CO₂.

Answer: a pattern in nature observed over and over

Explanation:

Scientific law is the statement(s) which describes or helps in the predicting the natural phenomena. The information in the scientific law is valid and it is verified by the experimental procedures and observations. It can be used to explain the cause of a natural phenomena, conditions responsible for natural phenomena, occurrence of the natural phenomena, also gives information why a natural phenomena repeat itself over and over again.

To separate powdered charcoal from powdered sugar, add water to dissolve the sugar, use gravity filtration to remove charcoal, and evaporate the water to recrystallize the sugar.

The mixture described containing powdered charcoal and powdered sugar is a heterogeneous mixture. A technique to separate these components would be filtration. Since charcoal is insoluble in water and sugar is soluble, we can add water to the mixture to dissolve the sugar.

After the sugar has dissolved, we can use gravity filtration to separate the charcoal from the sugar solution. The charcoal will stay in the filter paper while the sugar solution passes through.

To recover the sugar from the solution, we could then evaporate the water, leaving behind solid sugar. It's important to break up any clumps and use hot water to ensure efficient dissolving and filtration. If the charcoal passes through the filter paper, it might be necessary to refilter or use a filter aid like Celite.

Answer:

[tex]IO_4^-= Periodate\ ion[/tex]

[tex]IO_3^-= Iodate\ ion[/tex]

[tex]IO_2^-= Iodite\ ion[/tex]

[tex]IO^-= Hypoiodite\ ion[/tex]

Explanation:

Oxyanions:

Oxyanions are anions that have one or more oxygen atoms bonded to another elements is called oxyanions.

General formula of oxyanions are : [tex]A_xO_y^{z-}[/tex]

Where, A represents an element and O represents oxygen atom.

Four most common oxyanions of Iodine are:

[tex]IO_4^-= Periodate\ ion[/tex]

[tex]IO_3^-= Iodate\ ion[/tex]

[tex]IO_2^-= Iodite\ ion[/tex]

[tex]IO^-= Hypoiodite\ ion[/tex]

Answer:

n = 2

Explanation:

The first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

Quantum numbers are just a sequence of numbers that represent the location and momentum of a particular atom or ion.

Calculation of quantum number.

It is given that, 2s2.

Here, 2 will be the principle quantum number.

Therefore, the first quantum number of 2s2 electron in phosphorus will be 2 which is principle quantum number.

To know more about quantum number.

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Final answer:

Electrons in an atom, according to modern quantum mechanics, can be found in an electron cloud, occupying regions of space around the nucleus with probabilistically determined densities.

Explanation:

According to the modern theory of the atom, known as quantum mechanics, an atom's electrons can be found within specific regions of space around the nucleus, often referred to as the electron cloud.

Unlike the earlier Bohr model which suggested electrons travel in discrete orbits, quantum mechanics proposes that electrons exist in probabilistic distributions - the regions where electrons are most likely to be found.

These distributions are characterized by four quantum numbers, much like a home address, with the first three providing an approximation of the electron's location in the atom and the fourth describing the electron's spin direction.

The electron cloud has variable densities, indicating the likelihood of finding an electron at a given location; the closer to the nucleus, the higher the density. This concept is crucial for understanding how atoms interact and react with one another, as chemical reactions are typically a result of interactions between the valence electrons of different atoms.

In summary, electrons occupy shells and subshells that define an atom's electron configuration, which in turn influences the atom's chemical behavior.

Answer:

i think the answer choices is

A-Heat

B-A Gas

C-A cell

D-A solid

Explanation: