What causes us to have night and day

Answer:

Double replacement is the answer

Based on given data, the molality of the 95% concentrated sulfuric acid is 193.6 mol/kg, and its molarity is 17.8 M.

Calculating Molality and Molarity of Concentrated Sulfuric Acid Solution

To calculate the molality of the acid, we first need to find the moles of H₂SO₄ present in 1000 g of the solution (1 L of solution):

The weight of H₂SO₄ in 1000 g of solution = 950 g (since it is 95% by weight)

The number of moles of H₂SO₄ = weight / molar mass

Molar mass of H₂SO₄ = 2(1.008) + 32.06 + 4(16.00)

                                    = 98.08 g/mol

Number of moles of H₂SO₄ = 950 g / 98.08 g/mol

                                             = 9.68 mol

The mass of solvent (water) in 1000 g of solution can be calculated as follows:

Mass of solution = 1000 g

Mass of solute (H₂SO₄) = 950 g

Mass of solvent = Mass of solution - Mass of solute = 50 g

The molality of the solution is then:

Molality = moles of solute / mass of solvent (in kg)

Mass of solvent in kg = 50 g / 1000 g/kg

                                   = 0.05 kg

Molality = 9.68 mol / 0.05 kg

             = 193.6 mol/kg

To calculate the molarity of the acid, we need to take into account the density of the solution. The molarity is defined as the number of moles of solute per liter of solution. Since the density of the solution is 1.84 g/cm³, we can calculate the volume of 1000 g of the solution as follows:

Volume of solution = mass of solution / density of solution

Volume of solution = 1000 g / 1.84 g/cm³ = 543.5 cm³ = 0.5435 L

The molarity of the solution is then:

Molarity = moles of solute / volume of solution (in L)

Molarity = 9.68 mol / 0.5435 L = 17.8 M

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The answer of the calculations above in scientific notation are a=8.3 ×10³, b= 3.9 × 10^¹um, c= 1.4 × 10³gmol, d= 5.6× 10²km

In calculation of various expressions, the results can be expressed in a scientific notation which is a way to compress cumbersome figures.

4.2 × 104 = 436.8

7.9 × 10³ = 7900

436.8 + 7900 = 8,336.8

The scientific notation= 8.3 ×10³kg

5.23 x 106 um = 554.38um

554.38 × 7.1 = 3,936.1

3,936.1 × 10^-²

3.9 × 10³ × 10^-²= 3.9 × 10^¹um

The scientific notation= 3.9 × 10^¹um

5.44 x 107 g = 582.08g

8.1 x 104 mol = 842.4 mol

582.08g+ 842.4 mol = 1,424.48

The scientific notation = 1.4 × 10³gmol

8.40 x 105 km = 882km

3.1 × 105 = 325.5km

882km - 325.5km = 556.5

The scientific notation = 5.6× 10²km

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If a product is seen on social media It can be determined whether it is making reliable claims by researching and checking credentials.

It is crucial to assess claims made about items that are promoted on social media seriously and not only depend on what is said in the advertisement. Finding information on the product from reliable sources outside of social media is crucial. Looking for ratings, reviews, and comments from trustworthy websites or sources, such as consumer review websites, industry insiders, or reliable news organizations is also an effective step.

Further, one must watch out for ratings or reviews that are unreasonably favorable. Additionally, one needs to assess the authority of the source advertising the goods on social media. Looking for trusted businesses, authoritative websites, and verified accounts is essential along with being aware of accounts or websites with dubious credentials or a lack of openness.

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Answer:

Nuclide, , also called nuclear species, species of atom as characterized by the number of protons, the number of neutrons, and the energy state of the nucleus. ... The term nuclide is not synonymous with isotope, which is any member of a set of nuclides having the same atomic number but differing mass number.

Explanation:

Answer:

a distance isotope of an atom

Explanation:

In oxidative phosphorylation, electrons flow through the cytochrome chain. The process begins with the transfer of high-energy electrons from reduced molecules, such as NADH and FADH2, to protein complexes in the inner mitochondrial membrane called the electron transport chain (ETC).

Electrons move along the ETC through various protein complexes, including cytochromes, which are heme-containing proteins that facilitate electron transfer.

As electrons flow through the cytochrome chain, they lose energy, which is used to pump protons across the inner mitochondrial membrane, creating an electrochemical gradient.

This proton gradient drives ATP synthesis via ATP synthase, an enzyme that utilizes the potential energy stored in the gradient to generate ATP from ADP and inorganic phosphate. This coupling of electron transport to ATP synthesis is called oxidative phosphorylation.

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According to the concept of Avogadro's number and STP conditions volume in liters of the sample is 15,388.7.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

Number of moles is obtained as, number of atoms/Avogadro's number=4.088×10²⁴/6.023×10²³=6.78 moles on substitution in formula of PV=nRT=V=6.78×8.314×273/1=15,388.7 liters.

Thus, the volume is 15,388.7 liters of the sample.

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Answer:

The pH of a solution is the negative logarithm of the hydrogen-ion concentration. The pH of pure water or any neutral solution is thus 7.00.

Explanation:

Answer:

hydrogen concentration

Explanation:

Answer:

Each volumn is different and therefore has a specific and unique mass.

Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:

1. The initial pH of the pure water is 7

2. The final pH of the water is 1.38

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

Molarity = mole / Volume

Molarity = 2×10¯² / 0.48

Molarity = 4.17×10¯² M

HCl(aq) —> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺

pH = –Log H⁺

pH = –Log 4.17×10¯²

pH = 1.38

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Answer:

The answer is "electron transport chain".

Explanation:

Decreased electron carriers (NADH and FADH2) enter their sequence of electron transport which is used for the processing of ATP molecules. For an electron for both the membrane proteins found in the electron transport system, NADH and FADH2 function. To produce ATP, its movement of electricity of the membrane proteins is important. Its NADH and FADH2 retinoic acid are regenerated as electron flow proceeds.

Based on the information given, there is Lansing city among the options provided that is located at approximately 45° north latitude and 85° west longitude. Option B

To determine the city located at approximately 45° north latitude and 85° west longitude, we can refer to the given list of cities and their corresponding latitude and longitude coordinates.

Based on the latitude and longitude values provided, the city located at approximately 45° north latitude and 85° west longitude is Lansing. Lansing is the capital city of the state of Michigan and is situated in the Lower Peninsula of Michigan.

Boise, Denver, Austin, Saint Paul, Madison, Lansing, Indianapolis, Nashville, and Atlanta are all listed cities, but by examining their approximate latitude and longitude coordinates, we can see that Lansing is the closest match to the given coordinates.

It's important to note that the accuracy of the answer may depend on the precision of the latitude and longitude values provided for each city. However, based on the information given, Lansing is the city that aligns closest to the approximate coordinates of 45° north latitude and 85° west longitude.

Option B

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The elementary reactions in the given set are: \(2 NO(g) + 2 H_2(g)\) → \(N_2(g) + 2 H_2O(g)\), \(2 NO(g) + O_2(g)\) → \(2 NO_2(g), NO_2(g) + CO(g)\)→ \(CO_2(g) + NO(g)\).

Elementary reactions are individual reactions that cannot be further broken down into simpler steps. In the given set, the first reaction involving the combination of 2 NO molecules with\(2 H_2\) molecules to form \(N_2\) and \(2 H_2O\) satisfies the definition of an elementary reaction.

Similarly, the second reaction where 2 NO molecules react with \(O_2\) to produce 2 \(NO_2\) also qualifies as an elementary reaction. Finally, the third reaction where\(NO_2\) reacts with CO to yield \(CO_2\)and NO is another example of an elementary reaction. These reactions directly involve the reactant molecules without any intermediates or multiple steps.

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Answer:

C. identification. PCR testing can aid in the identification of fly species in a forensic investigation.

Explanation:

PCR testing can aid in the identification of fly species in a forensic investigation. PCR (Polymerase Chain Reaction) is a laboratory technique that allows the amplification of a small amount of DNA to detectable levels.

In forensic entomology, PCR can be used to identify the species of flies that are found at a crime scene. This is important because different species of flies have different developmental rates and life cycles. By identifying the species of fly present at a crime scene, forensic investigators can estimate the time of death more accurately.

PCR can be used to identify the fly species by analyzing the DNA present in the fly samples. The DNA is extracted from the samples and then amplified using PCR. The amplified DNA can then be sequenced to identify the fly species.

Therefore, the answer to the question is C. identification. PCR testing can aid in the identification of fly species in a forensic investigation.

(a) The reaction order with respect to substance A is 1, with respect to substance B is 3, and the overall order is 4. (Rate = \(k[A][B]^{3}\))

(b) The reaction order with respect to substance A is 1, with respect to substance B is 1, and the overall order is 2. (Rate = k[A][B])

(c) The reaction order with respect to substance A is 0, with respect to substance B is 2, and the overall order is 2. (Rate = \(k[B]^{2} [A]^{0}\))

In chemical kinetics, the rate law describes the relationship between the rate of a reaction and the concentrations of reactants. It is represented by the equation Rate = \(k[A]^{m} [B]^{n}\), where k is the rate constant, A and B are the reactants, and m and n are the reaction orders.

(a) For the rate law Rate = \(k[A][B]^{3}\)

The reaction order with respect to substance A is 1, indicating a first-order dependence on A. The reaction order with respect to substance B is 3, meaning that the rate is proportional to the cube of the concentration of B. The overall order is the sum of the individual reaction orders, resulting in an overall order of 4.

(b) In the rate law Rate = k[A][B]

The reaction order with respect to substance A is 1, indicating a first-order dependence on A. Similarly, the reaction order with respect to substance B is also 1. The overall order of the reaction is determined by adding the individual reaction orders, resulting in an overall order of 2.

(c) For the rate law Rate = \(k[B]^{2} [A]^{0}\)

The reaction order with respect to substance B is 2, indicating a second-order dependence on B. In contrast, the reaction order with respect to substance A is 0, implying that the concentration of A does not affect the rate of the reaction. The overall order is determined by summing the individual reaction orders, resulting in an overall order of 2.

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Generally, in materials with lower densities, light waves tend to travel faster.

The speed of light waves in a medium is determined by the refractive index, which is related to the density of the material.

The refractive index (n) of a material is defined as the ratio of the speed of light in a vacuum (c) to the speed of light in the material (v):

n = c/v

Since the speed of light in a vacuum is a constant (approximately 3 x 10^8 meters per second), the refractive index depends on the speed of light in the material.

When comparing the densities of different materials, lower density materials tend to have lower refractive indices and thus allow light to travel faster. This is because lower density materials have fewer particles per unit volume, resulting in less interaction between the light waves and the particles.

Therefore, in materials with lower densities, such as gases or less dense liquids, light waves generally travel faster compared to denser materials like solids.

However, it's important to note that the speed of light can also be influenced by other factors such as the material's optical properties, temperature, and wavelength of the light.

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Answer:

When a solid turns directly to a gas this is called sublimation. From the graph it can be seen if the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.

Explanation:

Answer:If the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.

Explanation:

Answer:

2.4%

Explanation:

Answer:

The formula shows that there is one atoms of iron in each formula unit of FeCl3, and by definition the number of molecules or formula units in a mole is Avogadro's Number. Therefore, 5.33 moles contains 5.33 X Avogadro's Number of atoms, which is 3.21 X 1024 atoms, to the justified number of significant digits.

Answer:

The formula shows that there is one atoms of iron in each formula unit of FeCl3 , and by definition the number of molecules or formula units in a mole is Avogadro's Number . Therefore , 5.33 moles contains 5.33 X Avogadro's Number of atoms , which is 3.21 X 1024 atoms , to the justified number of significant digits .

. a. Reversible reactions: Reversible reactions are chemical reactions in which the products can react to form the original reactants.

In other words, the reaction can proceed in both the forward and reverse directions.

b. State of dynamic equilibrium: In a reversible reaction, a state of dynamic equilibrium is reached when the rates of the forward and reverse reactions become equal.

At this point, the concentrations of reactants and products remain constant, even though the reactions continue to occur.

c. Equilibrium constant expression: The equilibrium constant expression (Kc) is a mathematical expression that represents the relationship between the concentrations of reactants and products in a chemical reaction at equilibrium.

It is written as the product of the concentrations of the products raised to their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants raised to their respective stoichiometric coefficients.

d. Equilibrium constant: The equilibrium constant (K) is a numerical value that represents the ratio of the concentrations of products to reactants at equilibrium for a specific reaction.

It indicates the extent to which a reaction favors the formation of products or reactants. A large K value indicates that the reaction favors the formation of products, while a small K value indicates that it favors the formation of reactants.

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Answer:

In First compound the longest chain contains 7 C atoms.

In the Second compound the longest chain contains 9 C atoms.

In the Third compound the longest chin contains 7C atoms.

Explanation:

In first compound the longest chain contains 7 carbon atoms.In the second compound the longest chain contains 9 carbon atoms.In the third compound the longest chin contains 7 carbon atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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I would determine the rate at which an automobile adds carbon dioxide to the atmosphere by taking an open system, a control volume just around the area of the outlet where the exhaust gases are released. The boundaries are the sides (for example) of the pipe through which the gas is released.

A general study says that a typical passenger vehicle emits about 4.6 metric tons of carbon dioxide per year. This makes possible assumption that the average gasoline vehicle on the road today has a fuel economy of about 22.0 miles per gallon and drives around 11,500 miles per year. Each and every gallon of gasoline burned creates about 8,887 grams of CO₂.

The amount of CO₂ can be calculated by the above given process.

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Answer:

baseball 0.150

pineapple 1.600

full can of... 0.390

inflated balloon 0.003

Answer:

mayonaze

Explanation:

mayonaze has 39.1 grams of potassium

Answer:

Explanation:

If another predator was introduced to this food web, this food web would fail because it won't be balanced well. Let's say the predator eats more food than the eagle. Then the eagle would have less food for itself, and it might go endangered, and vice versa if the eagle eats more. Either way, this would cause almost no worms left and that means there would be an overflow of the rats because there would be no worms for them to be eaten by. This would cause a shortage of crops as well.

I hope this made sense!

According to the question of mass, 0.159 moles moles are in 15g of k₂O.

Mass is a scientific concept that describes the amount of matter contained in a given object or material. It is measured in kilograms (kg) and is different from weight, which is measured in Newtons. Mass is the measure of an object’s inertia and its resistance to acceleration when a force is applied. In other words, it is the amount of matter in an object, regardless of its shape or size. Mass can be determined using a variety of instruments or machines, like a balance or a scale. Mass is a fundamental property of matter and is used to calculate the weight of an object. Mass is a key concept in physics, chemistry, and engineering.

15g of k₂O is equal to 0.159 moles. This can be calculated by dividing 15g by the molar mass of k₂O (94.2g/mol): 15g/94.2g/mol = 0.159 moles.

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Answer:

Plants provide us with food, medicine, wood, fuel, and fiber. In addition, they provide shelter for a multitude of other living beings, produce the oxygen we breathe, maintain the soil, regulate humidity and contribute to climate stability.

2890 g H₂O

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

9.65 × 10²⁵ molecules H₂O (water)

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

2887.63 g H₂O ≈ 2890 g H₂O

Answer: Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light.

Explanation: In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants.