Using the diagram , what is the intersection of plan ABCD and GC?

Answer:

Solutes examples are

Air,(gas) humid air (gas), polluted air(gas)

Examples of Solvents are Milk(liquid), water(liquid).,

Pepsi(liquid).

Sea water(liquid)

Explanation:

Solutes are substances that are dissolved and it is present in minute fraction in a solution.

Solvents is the medium that dissolve substances or solutes and it is present in large amount in a solution.

Solutes and solvents for solution.

Solution is formed when substances dissolves in another.

Air: The solvent is nitrogen because it is present in large quantities and the solutes is oxygen because it is present in small quantity.

Pepsi :sugar, caffeine and carbon dioxide as solutes and the solvent is water.

Milk: lactose, some minerals are solutes and Water is the solvent.

Humid air: water is the solutes and gases is the solvent.

Sea water: salt is the solute and water is the solvent.

Polluted air: Air is the solvent and dust particles is the solutes.

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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Answer:

the greater the concentration of particles the lower the freezing point will be.

Niels Bohr is known for developing the planetary model of atom. Therefore, option (A) is correct.

In the planetary model, the electrons of an atom orbit around the nucleus like the planet orbits around the sun. The Bohr model proposed by Neils Bohr is similar to the planetary motion. Therefore, this model is also known as the planetary model of the atom.

In this model, the negatively charged electrons orbit around the positively charged nucleus which is present in the center of an atom. Similar to the gravitational force between the sun and the planets, there is a coulomb force of attraction between the electrons and the nucleus.

The orbits in which electrons revolve are named Principal quantum number n. The energy levels of an atom having principal quantum numbers n = 1, 2, 3, 4....... are assigned to the shells K, L, M,........ respectively.

Therefore, the planetary model of the atom was proposed by Neils Bohr by modifying the Rutherford model.

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The molar solubility of a substance refers to the maximum amount of solute that can dissolve in a solvent to form a saturated solution at a given temperature. In this case, we have a beaker containing a saturated solution of lead(II) chloride in equilibrium with solid lead(II) chloride.

To determine the case where the molar solubility will be lowest after equilibrium is reestablished, we need to consider the effect of each scenario on the solubility of lead(II) chloride.

1. Upon the addition of more water: When water is added, the system shifts towards the dissolution of the solid lead(II) chloride to maintain equilibrium. This increases the amount of dissolved lead(II) chloride and therefore increases the molar solubility. So, the molar solubility will not be lowest after the addition of more water.

2. After the addition of 0.200 moles of Cl− ion: The addition of Cl− ions can potentially form lead(II) chloride, causing more solid lead(II) chloride to dissolve to maintain equilibrium. This increases the molar solubility. Therefore, the molar solubility will not be lowest after the addition of 0.200 moles of Cl− ion.

3. After the addition of solid NaNO3: The addition of NaNO3 does not directly affect the solubility of lead(II) chloride. It introduces a new solute into the solution but does not change the concentration of Cl− ions or lead(II) ions. Therefore, the molar solubility will remain unchanged after the addition of solid NaNO3.

4. After the addition of 0.200 moles of Pb2+ ion: The addition of Pb2+ ions can potentially react with Cl− ions to form more solid lead(II) chloride, reducing the amount of dissolved lead(II) chloride and decreasing the molar solubility. Thus, after the addition of 0.200 moles of Pb2+ ion, the molar solubility will be lowest.

In summary, after equilibrium is reestablished, the molar solubility will be lowest after the addition of 0.200 moles of Pb2+ ion.

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Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of aluminum = 12 cm³

Density = 2.70 g/cm³

The mass of aluminum is

mass = 2.7 × 12

We have the final answer as

Hope this helps you

1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

To burn 1 molecule of C3H8 completely, 5 molecules of O2 are required. This reaction can be written as follows:
C3H8 + 5O2 → 3CO2 + 4H2O
The balanced equation shows that for every molecule of C3H8 burned, 5 molecules of O2 are needed to completely react with the carbon and hydrogen in the fuel. This information can be useful for calculating the amount of oxygen required for a given amount of fuel, as well as for understanding the environmental impact of burning hydrocarbons.
To burn 1 molecule of propane (C3H8) in a complete combustion reaction, you need 5 molecules of oxygen (O2). The balanced chemical equation for this reaction is: C3H8 + 5O2 -> 3CO2 + 4H2O. In this reaction, 1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

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decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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Answer:

24g

Explanation:

2×12=24

1mole of Mg react with 2 mooe of O2

Answer:

H2O

=(1×2)+(8)

=20

Explanation:

We have 1 Hydrogen(H) and 8 Oxygen(O)neutrons . Following the molecule formula, H2O, which means we have 2 Hydrogen that needs to times with 1 neutron;and we have only 1 Oxygen which has 8 neutrons. So 2 (H) have to times 1 and 1(O) have to times 8.

The notation for the enthalpy of the solution is ∆Hsol. The correct answer is option ∆Hsol.

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Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium

Answer:

8.765848 × 10^6

Explanation:

You move the decimal point 6 places to the right because it has to be between 1 and 10. Then, you multiply by 10 to the power of 6 because you moved the decimal point 6 times.

Answer:

3.) 195

Explanation:

Because platinum is 195.079 amu (its on the periodic table)

A purple box has P t at the center and 78 above. Below it says platinum and below that 195.08. Rounded to the nearest whole number, 195 is the atomic mass of platinum. Therefore, option C is correct.

The number of protons an element contains determines its atomic number, which is used to distinguish one element from another. The total number of protons and neutrons in an element determines its mass number.

The mass number is the total number of protons and neutrons in the nucleus. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You can determine the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.

Because its numerical value is equal to the element's molar mass, the average atomic mass is helpful. In turn, this helps determine how much of a solid.

The atomic mass of platinum is 195. Because atomic mass is always the bottom number below the name of the element.

Thus, option C is correct.

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The molarity of the solution is given as follows:

Molarity = 6.42/142/0.135 = 0.33 M

The concentration of the solution is given below:

Concentration = 43.2/58.5/0.29

Concentration = 2.54 mol/dm³

The concentration of the solution is given below:

Concentration = mass/molar mass /volume (L)

Concentration = 24.8/58.5/0.75

Concentration = 0.56 mol/dm³

Mass of NaCl = 0.238 * 58.5 * 0.35

Mass of NaCl =  4.87 g

Mass of AgNO₃ = 4.71 * 170 * 0.145

Mass of AgNO₃ =  116.1 g

Mass of AgNO₃ = 4.71 * 170 * 0.29

Mass of AgNO₃ =  232.2 g

In conclusion, the mass of the substances are derived from the volume and concentration of the solution as well as the molar mass of the substance.

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Answer:

Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged.

Explanation:

Ques: how to identify physical or chemical properties

Ans:  you can identify them by their properties. make sure that it matches its property. but you must know the physical and chemical properties . i will give an example .so how to identify boiling of eggs and changing of water into ice. Physical properties

-it can be reversed back

-it is temporary change

-no new substance is formed

chemical properties

-it cannot be reversed back

-it is permanent change

-new substance  is formed

now boiling of eggs matches all property of chemical change so it is chemical change. changing of water to ice matches all property of physical change so it is physical change.

hope it helps

Answer:

stars

earth isn't made of gas. (and you can always see it)

moon us not gas, or give off heat

sun is only visible during the day

pH plays a crucial role in cation exchange and mineral retention in soil. Low pH (acidic conditions) increases the release of cations from soil particles, while high pH (alkaline conditions) promotes cation retention and reduces their availability for plants.

The pH of soil affects cation exchange and mineral retention through its influence on the soil's electrical charge and the solubility of minerals. In acidic conditions (low pH), the soil becomes positively charged, which leads to the release of cations from soil particles.

The high concentration of hydrogen ions (H+) displaces cations from the exchange sites on clay particles, allowing them to be leached away or become more available for plant uptake. This increased cation release can result in nutrient deficiencies for plants.

Conversely, in alkaline conditions (high pH), the soil becomes negatively charged. This facilitates the retention of cations on soil particles, reducing their availability for plant uptake.

The elevated concentration of hydroxide ions (OH-) can compete with cations for binding sites on clay minerals and organic matter, effectively immobilizing the cations and decreasing their mobility in the soil.

Therefore, maintaining an optimal pH range for specific crops is essential for promoting cation exchange and mineral availability in the soil. pH management through soil amendments and fertilization practices can help create favorable conditions for nutrient uptake and plant growth.

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A ring stand and clamp that are appropriately sized for the glassware, Position the clamp directly above the base of the ring stand,  making sure not to overtighten the clamp around any glassware.

Because a clamp is used to secure glassware like flasks, it's important to choose a clamp or ring stand of the right size so our glassware can fit on it correctly and easily.

Clasped mechanical assembly is generally ready over the base of the help or ring stand. Knobs are used to tighten the clamp so that clamped glassware does not move. However, the clamp should not be overtightened because doing so could break the glass.

Choose a ring stand and clamp that are the right size for the glassware before using a clamp to secure a flask to a ring stand. Position the clasp straight over the foundation of the ring stand. Adjust the clamp's knobs without over tightening the clamp around any glassware.

A ring stand is connected to ring clamps. They are available in a variety of sizes and can be used for: supporting a glass funnel in gravity filtration, supporting a heating mantle, or holding a separatory funnel during an extraction

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If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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The volume of the Naoh that is required was =4.074

What is the use of the buffer solution ?

A buffer is an aqueous solution made up of a weak acid and its salt (acid buffer) or a weak base and its salt (base buffer) (basic buffer). When a small amount of strong acid or base is added to it, its pH changes very little, and it is thus used to prevent the pH of a solution from changing.

Buffer solutions are utilised in several chemical applications. Blood is one example of a natural buffer solution. The natural pH of human blood is 7.4. Many people suffer from severe anxiety and alkalosis. Alkalosis is a condition in which the blood pH is abnormally high. The opposite situation is known as acidosis, which occurs when the pH of the blood exceeds 7.4.

naoh+nah2po4 ------------> h2o+na3po4

pka=3.39

7.30=3.39+(log(h2o/naoh)

log(h2o/naoh)=7.30-3.39

=3.91

=10^log(h2o/naoh)=10^3.91

=4.074

The volume required was=4.074

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The radius of a rhodium atom can be calculated using the density and the crystal structure. The radius is approximately 1.36x10^(-8) cm.

In a face-centered cubic (FCC) unit cell, each corner atom contributes 1/8th of its volume to the unit cell, while each face-centered atom contributes 1/2 of its volume. Rhodium crystallizes with an FCC unit cell structure.

To calculate the radius of the rhodium atom, we need to consider the relationship between the volume of the unit cell and the radius of the atom. The volume of the FCC unit cell can be expressed as:

Volume = (4/3)πr^3

The density of rhodium is given as 12.41 g/cm^3. From the density, we can calculate the mass of one rhodium atom using the molar mass of rhodium (102.9 g/mol).

Using the relationship between mass, volume, and density, we can then find the volume of one rhodium atom. By rearranging the equation, we get:

Volume = mass / density

Once we have the volume, we can solve for the radius by rearranging the equation for volume:

r = (3V / (4π))^(1/3)

By plugging in the values and performing the calculations, the radius of the rhodium atom is approximately 1.36x10^(-8) cm.


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In 5.00 g of FeSO4 (iron(II) sulfate), there are approximately 0.0257 moles of Fe2+ ions. This is calculated by converting the mass of FeSO4 to moles using its molar mass and then considering the stoichiometry of the compound.

1. To determine the number of iron(II) ions (Fe2+) in 5.00 g of FeSO4, we need to follow a series of steps. Firstly, we calculate the molar mass of FeSO4, which consists of one iron atom (Fe), one sulfur atom (S), and four oxygen atoms (O). The atomic masses are 55.845 g/mol for Fe, 32.06 g/mol for S, and 16.00 g/mol for O. Adding them up, we get a molar mass of 151.91 g/mol for FeSO4.

2. Next, we convert the mass of FeSO4 (5.00 g) to moles by dividing it by the molar mass. Thus, 5.00 g / 151.91 g/mol gives us approximately 0.0329 moles of FeSO4.

3. Considering the balanced chemical equation for the formation of FeSO4, we can see that each FeSO4 molecule contains one iron(II) ion (Fe2+). Therefore, the number of Fe2+ ions is equal to the number of FeSO4 molecules.

4. Consequently, we have approximately 0.0329 moles of Fe2+ ions in 5.00 g of FeSO4. To find the number of Fe2+ ions, we multiply the number of moles by Avogadro's number (6.022 x 10^23 ions per mole). Thus, 0.0329 moles x 6.022 x 10^23 ions/mole gives us around 1.98 x 10^22 Fe2+ ions in 5.00 g of FeSO4.

5. In summary, there are approximately 1.98 x 10^22 iron(II) ions (Fe2+) in 5.00 g of FeSO4. This calculation is based on converting the mass of FeSO4 to moles, considering the stoichiometry of the compound, and using Avogadro's number to determine the number of ions.

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The blank space in the task statement should be filled with 25 as methane can retain 25 times more heat than carbon dioxide.

Methane, carbon dioxide amongst other gases are important greenhouse gases which allows the Earth retain it's heat in order for it to be habitable.

Methane can retain and release about 25 times more heat than Carbon Dioxide although Methane emissions are lower compared to Carbon Dioxide.

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Absolute zero is defined as the theoretically lowest attainable temperature, which is -273.15 K or 0 degrees Celsius.

Absolute zero is the temperature at which the particles of a substance have minimum kinetic energy, and hence, the substance has minimum internal energy. This temperature is the lower limit of the thermodynamic temperature scale, and it is denoted as 0°C (-273.15 Kelvin).

Absolute zero is equivalent to -273.15 K or 0 degrees Celsius, which is the point at which all molecular motion ceases. It is impossible to reach absolute zero in practice, although scientists have been able to cool certain substances to within a few billionths of a degree of it.

Therefore the answer is the lowest attainable temperature, which is -273.15 K.

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The difference in the number of covalent bonds between nitrogen (N2) and oxygen (O2) is due to their electronic configurations and the stability they achieve by forming specific types of bonds.

In the case of nitrogen (N2), each nitrogen atom has five valence electrons. In order to achieve a stable electronic configuration, nitrogen needs to share three electrons with another nitrogen atom. This is achieved through the formation of a triple covalent bond, where each nitrogen atom shares three electrons with the other.

On the other hand, oxygen (O2) has six valence electrons per oxygen atom. To achieve a stable electronic configuration, each oxygen atom needs to share two electrons with another oxygen atom. This is achieved through the formation of a double covalent bond, where each oxygen atom shares two electrons with the other.

The reason for this difference lies in their atomic orbitals. Nitrogen has three unpaired electrons in its 2p orbitals, allowing it to form three covalent bonds. Oxygen, on the other hand, has two unpaired electrons in its 2p orbitals, allowing it to form two covalent bonds.

Additionally, the bond strength also plays a role. The triple bond in N2 is stronger than the double bond in O2, requiring more energy to break. This is due to the overlap of atomic orbitals and the sharing of electrons in the bonding process.

In summary, the difference in the number of covalent bonds between N2 and O2 is a result of their electronic configurations and the stability they achieve through specific bond formations based on their valence electrons and atomic orbitals.

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Answer:

In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

Answer:

Yes, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

Explanation:

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