Which of the following is false?


The orbits defined in the Bohr model of an atom for atoms in the first and second period. But, beyond those atoms, the model no longer is appropriate.


The dual nature of an electron prevents simultaneously knowing both the exact location and the velocity of the electron.


The Schrödinger equations take into account the dual nature of an electron to define regions in space where electrons have a high probability of being located.


The more precisely the location of an electron is known, the less precisely the velocity is known.

The pH of milk is approximately 6.6.

The formula for calculating pH is:

pH = -log[H+]

Given that [H+] of milk is about 2.51 × 10–7, we can substitute this value into the formula to calculate the pH:

pH = -log(2.51 × 10–7)

pH = -(-6.6)

pH = 6.6

Therefore, the pH of milk is approximately 6.6.

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O₂

A limiting reactant is the reactant that runs out first in a reaction.

Oxygen

To find the limiting reactant, we can find how many reactions will occur with the given amount of reactant. To do this we can divide moles of the reactant by moles per reaction. If the reaction occurs 1 time, we say that 1 mol of reaction is created. So, the reactant that forms fewer moles of reaction is the limiting reactant.

This means that with 12 moles of oxygen, 1 full reaction will occur (1 mol of reaction).

Naphthalene (C₁₀H₈)

Now, we can do the same equation with Naphthalene. If it creates fewer moles of reaction, then it is the limiting reactant. If not, then oxygen is the limiting reactant.

This means that 1.1 moles of Naphthalene will create 1.1 mol of reaction.

Limiting Reactant

The math above shows that the amount of oxygen given will only create 1 mol of reaction, while the Naphthalene forms 1.1 mols of reaction. Thus, oxygen is the limiting reactant because it creates fewer moles of reaction.

Answer:

Explanation:

Theoretical yield is 7.9 g O2

% yield is actual/theoreticalx 100  = 6.7/7.9 X 100= 84.81 % O2

There are 5 mol of CaSO3 were left after the water was driven off.

The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass.

A mole is the atom's elementary particle, an ion. The mole of the substance is always related to the Avogadro number. The mole is always associated with the weight or mass of the element or substance. The standard unit of a mole is mol. The mole is a significant factor of the reactant and products to form an equation. A mole calculates the atom, ion, and substance weighs.

Therefore,  are 5 mol of CaSO3 were left after the water was driven off.

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Answer:

Carbon

Name: Carbon

Symbol: C

Number of protons: 6

Number of neutrons: 6 or 7 (Carbon has two stable isotopes with 6 or 7 neutrons)

Number of electrons: 6

Sodium

Name: Sodium

Symbol: Na

Number of protons: 11

Number of neutrons: 12 or 13 (Sodium has one stable isotope with 12 neutrons, and another with 13 neutrons)

Number of electrons: 11

Helium

Name: Helium

Symbol: He

Number of protons: 2

Number of neutrons: 2

Number of electrons: 2

Chlorine

Name: Chlorine

Symbol: Cl

Number of protons: 17

Number of neutrons: 18 or 20 (Chlorine has two stable isotopes with 18 or 20 neutrons)

Number of electrons: 17

Gold

Name: Gold

Symbol: Au

Number of protons: 79

Number of neutrons: 118 (Gold has only one stable isotope with 118 neutrons)

Number of electrons: 79

Answer: 4848.22 mL

Explanation:

V2= P1V1T2/(T1 P2)  = (400.00 X 12.0 X 300.15)/(270.15 x 1.10)

The mass of 4.5 moles of CO2  is 7.48x10-11 g CO2  Option b)

The ratio between the mass and the quantity of material (measured in moles) of any sample of a chemical compound is known as the molar mass (M) in chemistry.  The molar mass of a material is a bulk characteristic rather than a molecular one. The compound's molar mass is an average over many samples, which frequently have different masses because of elements.

A terrestrial average and a result of the relative frequency of the isotopes of the component elements on Earth, the molar mass is most frequently calculated from the standard atomic weights. For changing between a substance's mass and quantity in bulk amounts, the molar mass is the proper unit.

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Answer:

After millions of years underground, the compounds that make up plankton and plants turn into fossil fuels. Plankton decomposes into natural gas and oil, while plants become coal. Today, humans extract these resources through coal mining and the drilling of oil and gas wells on land and offshore.

Explanation:

Fossil fuels such as oil, coal and natural gas formed from living organisms on land and in sea are non-renewable resources created by the extinction of prehistoric plants and animals that are gradually being buried under rock layers.

Crude oil (also called crude oil or simply petroleum) is a fossil fuel formed from the remains of ancient marine organisms.  After it died and sank to the bottom of the sea, the organic material mixed with other sediments and was buried.

Over the years, the rubble has been covered by layers of sand and silt. The heat and pressure of these layers helped turn the remains into what we now call oil or petroleum (fossil fuels).

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Answer:

Three atoms of Hydrogen.

Explanation:

There are four molecules of three Hydrogen atoms and two oxygen atoms.

Hope it helps.

The elements which come after 'C' and 'Si' are 'Ge' and 'Sn'. The element 'F' is the most electronegative element. Down the group the electronegativity generally decreases.

The electronegativity of an atom is defined as the relative tendency or power of the bonded atom in a molecule to attract the shared pair of electrons towards itself.

In general the electronegativity decreases on moving down a group. The increase in the size of atoms and the shielding effect of inner electrons decreases the electronegativity.

Here 'Ge' and 'Sn' comes below 'C' and 'Si'.

Thus the electronegativity of the elements after 'C' and 'Si' decreases.

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The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O

When a force is applied to an object, the object changes its state. Therefore, the correct option is option D.

A force is an effect in physics that enables the movement of something with mass that change its velocity and accelerate. It may represent a push or perhaps a pull, with the direction and magnitude always present, making this one a vector quantity. It really is measured in newtons (N) and is denoted by the sign F.

Newton's second law, in its original form, states that perhaps the net force exerted on an object is equivalent to the pace that its momentum varies with time. When a force is applied to an object, the object changes its state.

Therefore, the correct option is option D.

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Rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].

What is rate law expression?

It is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it multiplying with rate constant. Rate in rate law expression is decided according to slow step.

Example-

If a  reaction given as  A + B → C    rate constant = k

rate = k [A] [B]

Given,

Step 1: NO₂+ F₂ → NO₂F + F (slow)

Step 2: NO₂+F → NO₂F (fast)

rate = k [NO₂] [F₂]

Therefore, rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].

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In Question 4, Jasmine calculated the amount of energy absorbed by the water when the burning Cheeto was placed in it. Although the calculation related only to the water, we can still determine the amount of energy released by the burning Cheeto. This is because of the Law of Conservation of Energy, which states that energy cannot be created or destroyed, only transferred or transformed from one form to another. In this case, the energy released by the burning Cheeto is transferred to the water, causing its temperature to increase.

Therefore, we can use the amount of energy absorbed by the water (calculated in Question 4) as a measure of the amount of energy released by the burning Cheeto. We can assume that the energy released by the Cheeto is equal to the energy absorbed by the water. This is known as the principle of calorimetry, which states that the heat lost by the object being studied is equal to the heat gained by the surrounding medium.

However, it is important to note that this assumption is only valid if all the energy released by the Cheeto is transferred to the water. In reality, some energy may be lost to the surroundings, such as through radiation or conduction. Therefore, the calculated value for the energy released by the Cheeto may be slightly lower than the actual value.

grouping elements into s, p, d, and f blocks allows us to predict the chemical and physical properties of elements based on their electron configurations and periodic table positions.

The periodic table's s, p, d, and f blocks refer to the arrangement of electrons in the atom's outermost energy level (valence shell), and they are related to the element's type and properties in several ways.

Atomic size increases from right to left within a period and from top to bottom within a group.

Ionization Energy: The energy required to remove an electron from an atom is referred to as ionisation energy.

Electronegativity: The ability of an atom to attract electrons towards itself in a chemical bond is measured by electronegativity.

Reactivity: An element's reactivity is determined by the number of valence electrons it possesses. Because the s-block elements have one or two valence electrons, they are extremely reactive.

Chemistry: Ionic compounds are formed by s-block elements with nonmetals, whereas covalent compounds are formed by p-block elements.

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The percent yield of carbon dioxide if the 3.65 g of the gas is collected when the 10.0 g marble reacts is react with the HCl is 83 %.

The chemical reaction is as follows :

CaCO₃ (aq)  +  2HCl (aq) ----> CaCl₂ (aq)  + H₂O (l) + CO₂(g)

The mass of the CaCO₃  = 10 g

The molar mass of the CaCO₃  = 100.09 g/mol

The moles of the CaCO₃  = 10 / 100.09

The moles of the CaCO₃  = 0.0999 mol

The molar ratio of the carbon dioxide and the calcium carbonate = 1 : 1

The moles of the carbon dioxide = 0.0999 mol

The mass of the carbon dioxide = moles × molar mass

The mass of the carbon dioxide = 0.0999 × 44

The mass of the carbon dioxide = 4.40 g

The percent yield = ( actual yield / theoretical yield ) × 100 %

The percent yield = ( 3.65 / 4.40 ) × 100 %

The percent yield = 83 %

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The expected vapor pressure of the solution prepared by dissolving 183.0 g of fructose in 500.0 mL of water is approximately 0.0301 atm.

The mole fraction of water in the solution can be calculated as follows:

Moles of water = (volume of water in liters) x (density of water) / (molar mass of water)

Moles of water = (500.0 mL / 1000.0 mL/L) x (0.9982 g/mL) / (18.015 g/mol)

Moles of water = 27.722 mol

Moles of fructose = (mass of fructose) / (molar mass of fructose)

Moles of fructose = 183.0 g / 180.16 g/mol

Moles of fructose = 1.016 mol

The total moles of solute and solvent in the solution are:

Total moles = moles of water + moles of fructose

Total moles = 27.722 mol + 1.016 mol

Total moles = 28.738 mol

The mole fraction of water in the solution is:

Mole fraction of water = moles of water / total moles

Mole fraction of water = 27.722 mol / 28.738 mol

Mole fraction of water = 0.962

Using Raoult's Law, the expected vapor pressure of the solution can be calculated as:

Vapor pressure = mole fraction of water x vapor pressure of pure water

Vapor pressure = 0.962 x 0.0313 atm

Vapor pressure = 0.0301 atm

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According the question the Percent yield is 11.99%

Yield is an economic term referring to the income generated by an investment over a period of time. It is usually expressed as a percentage of the initial investment and is calculated by taking the total income earned and dividing it by the initial investment. Yield is an important measure of the performance of an investment, and is a key factor in determining the attractiveness of an investment. Yields can be calculated for individual investments, or for portfolios of investments. Yields can also be calculated for different types of investments, such as stocks, bonds, and mutual funds. Yields are also used to compare investments with different levels of risk, so investors can make informed decisions about their investments. Yields are affected by a variety of factors, including interest rates, inflation, and market conditions.

The percent yield can be calculated using the formula:

Percent yield = (Actual yield / Theoretical yield) * 100

For Magnesium Chloride, the theoretical yield is 14.87 moles, and the actual yield is 1.78 moles.

Therefore, the percent yield is:

Percent yield = (1.78 / 14.87) * 100 = 11.99%

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In the catalytic cycle, asp is capable of weak interactions with histidine that chymotrypsin does not have.

Throughout the catalytic cycle, Asp-102 maintains its negative charge. It establishes a salt bond with the protonated form of His-57 but not the deprotonated form, stabilizing the protonated form and boosting the histidine's affinity for protons.

The histidine residue interacts with aspartate and is oriented correctly as a result. Following that, histidine and serine's alcohol group may interact. Histidine changes serine from a weak nucleophile (alcohol) into a strong nucleophile by removing the hydrogen ion from the alcohol (alkoxide).

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In science, a statement that can be mathematically modeled based on repeated experimental observations, that describes some phenomenon of nature, is called a scientific law. A scientific law is a descriptive statement that summarizes a pattern observed in nature, typically expressed as a mathematical equation or formula, which describes the behavior of a particular natural phenomenon under certain conditions. Scientific laws are generally considered to be well-established and reliable, based on the repeated empirical evidence and testing that supports them.

Answer:

 6.022 × 10²³ units of that substance 

Explanation:

Answer:

NaOH + CuSO₄ → Na₂SO₄ + Cu(OH)₂ is a double displacement reaction

C₁₂H₂₂O₁₁ + 12O₂ --> 12CO₂ + 11H₂O. This is a combustion reaction, as it involves a fuel reacting with oxygen to form carbon dioxide and water. However, this is not a balanced equation and so I have added in the correct ratios to balance the equation.

NH₄NO₃ → N₂O + 2H₂O. This is a decomposition reaction, as it involves the compound ammonium nitrate, 'decomposing' or breaking down into smaller components: dinitrogen oxide and water

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl. This is a double replacement reaction

The molarity of the 25 mL Ba(OH)₂ solution required to neutralize 18.45 mL  0.01500 M HCl solution is 0.005535 M.

The balanced chemical equation for the reaction between Ba(OH)2 and HCl is:

Ba(OH)2 + 2HCl -> BaCl2 + 2H2O

The moles of HCl used can be calculated as:

moles of HCl = concentration of HCl x volume of HCl

moles of HCl = 0.01500 M x 0.01845 L

moles of HCl = 0.00027675 mol

Since the stoichiometry of the reaction is 1:2 between Ba(OH)2 and HCl, the moles of Ba(OH)2 can be calculated as:

moles of Ba(OH)2 = 0.00027675 mol / 2

moles of Ba(OH)2 = 0.000138375 mol

The molarity of Ba(OH)2 can be calculated as:

molarity of Ba(OH)2 = moles of Ba(OH)2 / volume of Ba(OH)2

molarity of Ba(OH)2 = 0.000138375 mol / 0.02500 L

molarity of Ba(OH)2 = 0.005535 M

Therefore, the molarity of Ba(OH)2 is 0.005535 M.

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Answer:

167.5g

Explanation:

From the question, we know the mass of NaCl and the molar mass of NaCl, so we can calculate the number of moles of NaCl:

Moles = mass ÷ molar mass

The molar mass of NaCl can be calculated by adding the relative formula masses of the elements Na and Cl:

23.0 + 35.5 = 58.5

We can use the formula to find the number of moles of NaCl:

moles = 138 ÷ 58.5

= 2.35897...

Now, we need to find the mass of Cl2. Rearranging the formula of moles = mass ÷ molar mass

mass = moles × molar mass

Calculating the molar mass of Cl2 by adding the relative atomic masses:

35.5 + 35.5 = 71

Hence the mass is:

2.35897... × 71 = 167.5g (to 1dp)

The statement which best describes a pure substance is that it has constant physical properties which is therefore denoted as option B.

This is referred to as a single kind of matter that cannot be separated into other kinds of matter by any physical means.

This type of sample of matter has both definite and constant composition and distinct chemical properties and is referred to as being homogeneous in nature with no form of impurities which is therefore the reason why it was chosen a the correct choice.

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Primary succession and secondary succession are similar in that they are both gradual processes and involve the creation of soil.

What is Primary succession and secondary succession?

Primary succession occurs in an area where no soil or living organisms are present, such as on bare rock or after a volcanic eruption. Over time, pioneer species like lichens and mosses establish themselves, eventually leading to the growth of small plants, shrubs, and trees. As these organisms die and decompose, they create soil, which allows for the growth of larger and more complex organisms. This process can take hundreds or even thousands of years.

Secondary succession, on the other hand, occurs in an area where soil and some living organisms are already present, but the community has been disturbed or destroyed, such as after a forest fire, a landslide, or human activity like clear-cutting or farming. The process begins with the growth of fast-growing and weedy species that quickly colonize the area, followed by the establishment of more complex and longer-lived species. Secondary succession is generally faster than primary succession because soil and some organisms are already present.

Primary succession and secondary succession are similar in that they are both gradual processes and involve the creation of soil.

However, they differ in terms of the starting point of the succession. Primary succession begins on bare rock or soil that has never been colonized by living organisms, while secondary succession begins on soil that has previously supported life but has been disturbed, such as after a forest fire or clear-cutting.

Therefore, the statement "Both occur where no life exists" is only true for primary succession, while "Both occur where life already exists" is only true for secondary succession.

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Explanation:

Refer to pic..........

The 6.10 g of MgO (Magnesium oxide) is needed to produce 9.38 g of Na2O(Sodium oxide).

To solve this problem, we need to use stoichiometry to relate the mass of Na2O produced to the mass of MgO used.

From the balanced chemical equation:

2 NaCl + MgO → Na2O + MgCl2

We can see that 1 mole of MgO produces 1 mole of Na2O. We can use the molar mass of Na2O to convert the given mass of Na2O to moles:

9.38 g Na2O x (1 mol Na2O / 61.98 g Na2O) = 0.1514 mol Na2O

Since 1 mole of MgO produces 1 mole of Na2O, we know that we need 0.1514 mol MgO to produce 0.1514 mol Na2O. Using the molar mass of MgO, we can convert this to mass:

0.1514 mol MgO x (40.31 g MgO / 1 mol MgO) = 6.10 g MgO

Therefore, 6.10 g of MgO is needed to produce 9.38 g of Na2O.

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Note: The question would be as

What mass of MgO is neded to produce 9. 38g of Na2O?

2NaCl+MgO=Na2O+MgCl2

Answer:

To calculate the mass of 2.007 moles of propane gas (C3H8), we need to first determine its molar mass.

The molar mass of propane (C3H8) can be calculated as:

3(C) + 8(H) = (3 x 12.01 g/mol) + (8 x 1.01 g/mol) = 44.11 g/mol

Therefore, the mass of 2.007 moles of propane is:

Mass = 2.007 moles x 44.11 g/mol = 88.46 g

So, the mass of 2.007 moles of propane gas (C3H8) is 88.46 g.

Answer: where are the photographs

Explanation: