The difference in temperature of the two glasses of water is 30°C. What is their difference in temperature on the Kelvin scale?
A. 30 K C. 243 K
B. 86 K D. 303 K

Answer:

true

Explanation:

Answer:

Explanation:

Weather refers to short-term changes in the atmosphere of each day ,

Climate describes what the weather is like over a long period of time in a specific area. Different regions can have different climates

Numerically speaking, the rate of disappearance of reactants is not always the same number as the rate of the appearance of products.

The reason behind it is that in a chemical reaction, both reactants and products are involved. Reactants transform into products over time, and this transformation is measured by the rate of reaction. The rate of reaction may be determined by the rate at which reactants disappear or products appear. However, the rate of disappearance of reactants may not be equal to the rate of appearance of products numerically because different numbers of moles of reactants and products may be involved in the chemical reaction. As a result, the stoichiometric coefficients of the reactants and products in the chemical equation play an important role in determining the rate of disappearance of reactants and the rate of appearance of products.

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There is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off

Soil erosion is influenced by various factors, including slope steepness, rainfall intensity, soil characteristics, vegetation cover, and land management practices. As slope steepness increases, the potential for soil erosion generally increases due to the gravitational force acting on the eroded materials. However, there is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off. The relationship between slope steepness and soil erosion is generally non-linear. At low slope angles, soil erosion tends to be minimal as the gravitational force is relatively weak. As the slope angle increases, soil erosion typically increases exponentially due to the increased force of gravity. Eventually, as the slope steepness continues to increase, soil erosion may reach a point of maximum potential where the erodibility of the soil and other factors become limiting factors. Beyond this point, the rate of soil erosion may start to taper off, but it does not completely stop. Instead, it may stabilize or decrease slightly compared to the maximum erosion potential observed at steeper slopes.

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Answer: iron rusting and wood burning

Explanation: both can be considered physically changes

Keeping oxygen out of the fermentation tank prevents the soy sauce from having a strong vinegary taste because the presence of oxygen promotes the oxidation of ethanol (alcohol) to acetic acid.

The fermentation process of soy sauce involves the conversion of ethanol (alcohol) to acetic acid by acetic acid bacteria. This transformation is known as the acetification process and is responsible for the characteristic sour taste of vinegar. Acetic acid bacteria require oxygen to carry out this conversion. When oxygen is present, the bacteria oxidize the ethanol in the fermentation tank, resulting in the production of acetic acid.

However, in the production of soy sauce, the goal is not to produce a strong vinegary taste but rather to develop a rich, savory flavor. Therefore, the fermentation tank is designed to exclude oxygen as much as possible. By keeping oxygen out of the tank, the oxidation of ethanol to acetic acid is minimized, and the soy sauce retains a milder taste with less vinegary acidity.

Keeping oxygen out of the fermentation tank prevents the soy sauce from having a strong vinegary taste by minimizing the oxidation of ethanol to acetic acid. This allows the soy sauce to develop a milder and more balanced flavor profile, aligning with the desired characteristics of soy sauce.

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0.040 grams of Mg are needed when reacted with excess HCl to produce 40.0 mL of hydrogen gas at 760 mm Hg and 23°C

To calculate the grams of Mg needed, we will use the ideal gas law (PV=nRT) and stoichiometry.

Given: volume of H₂ = 40.0 mL, pressure = 760 mm Hg, temperature = 23°C.

1. Convert volume to L: 40.0 mL × (1 L/1000 mL) = 0.040 L

2. Convert temperature to K: 23°C + 273.15 = 296.15 K

3. Convert pressure to atm: 760 mm Hg × (1 atm/760 mm Hg) = 1 atm

Using the ideal gas law, PV=nRT:

n = PV/RT = (1 atm × 0.040 L) / (0.0821 L atm/mol K × 296.15 K) = 0.00165 mol H₂

The balanced chemical equation is:

Mg + 2HCl → MgCl₂ + H₂.

From the stoichiometry, 1 mol of Mg produces 1 mol of H₂.

Therefore, moles of Mg needed = 0.00165 mol.

Finally, to find the grams of Mg needed, multiply by the molar mass of Mg (24.31 g/mol):

0.00165 mol × 24.31 g/mol = 0.040 g

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The mass of the mixture is 95.8 g and the percentage by mass of cyclohexane in the mixture is 81.33%.

To calculate the percentage by mass of cyclohexane in the mixture, you need to use the formula:

Percentage by mass = (mass of component / total mass of mixture) × 100

Given that you have a mixture of cyclohexane and water and the density of the mixture is 0.958 g/mL,

1. To determine the mass of the mixture, you need to know the volume of the mixture and the density of the mixture. Since the density of the mixture is given, you can use the following formula to determine the mass of the mixture:

mass of mixture = density of mixture × volume of mixture

The mass of the mixture is: mass of mixture = 0.958 g/mL × 100 mL = 95.8 g

2. Since the density of cyclohexane is given as 0.779 g/mL, you can use the following formula to determine the mass of cyclohexane:

mass of cyclohexane = density of cyclohexane × volume of cyclohexane = 0.779 g/mL × 100 mL = 77.9 g

3. Using the formula given above, you can calculate the percentage by mass of cyclohexane in the mixture:

percentage by mass of cyclohexane = (mass of cyclohexane / mass of mixture) × 100

percentage by mass of cyclohexane = (77.9 g / 95.8 g) × 100 = 81.33%

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If we take a  look at the composition and structure, both xylem and phloem are vascular tissues made up of cellulose and parenchymatous cells.

The Xylem is made up of of dead cells whereby parenchyma is  the only living part but Phloem is solely made up  of living cells that has no  nuclei.

Xylem is also made up of xylem vessels, tracheid's and xylem fibers.

Phloem on its own has four different elements which include:

sieve tubes, companion cells, phloem fibres, bast fibres, intermediary cells along with the phloem parenchyma.

In conclusion, the Xylem and Phloem are both tubular vascular tissues that plants use to transport water and food respectively.

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Answer: false

Explanation:

Answer:

1 mole =56 g

18.5 moles =56×18.5

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

\(\\ \sf\longmapsto H_2+Br_2\longrightarrow HBr\)

\(\\ \sf\longmapsto H_2+Br_2\longrightarrow 2HBr\)

On reactant side:-

On products side

The balanced chemical equation for the synthesis of hydrogen bromide is \(\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr\).

The balanced chemical equation has been given as the reaction in which the number of atoms for each element on the product and the reactant side is equal.

The HBr has been formed with the reaction of the hydrogen and the bromine. The balanced chemical equation for the reaction has been:

\(\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr\)

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Yes, a hydrogen atom in the ground state can absorb a photon of energy less than 13.6 ev.

The wavelength of the matter waves that make up an electron orbit around a nucleus is the same as the radius of the orbit. Any fractional number would not fit the circle of the electron orbit, but a whole number of wavelengths might. Atomic excitations, in which the electrons take in a photon to enter a higher energy state, are another process that an atom goes through. As a result, electrons' wavelength can shift, which also causes the electron's orbit to alter. The relationship between an electron's energy and wavelength is inverse. An electron in the ground state can therefore absorb a photon with energy equal to the energy difference between the ground state energy and excited state energy during atomic excitation.

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Pilocarpine is the name of the substance that causes sweating in the sweat chloride test. A drug called pilocarpine stimulates the sweat glands and causes more sweat to be produced. It is delivered by a procedure known as "iontophoresis."

During iontophoresis, two electrodes—one with a pilocarpine solution and the other with a neutral electrode—are used to apply a tiny electric current to the skin's surface. The pilocarpine is transported into the skin with the aid of the electric current, activating the sweat glands and resulting in the production of perspiration.

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The electron configuration of bromine is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵. To determine the number of core electrons, we need to identify the electrons in the inner energy levels or shells.

In the case of bromine, the innermost energy level is the 1s orbital, which contains 2 electrons. Moving outward, the next energy levels, 2s and 2p orbitals, contain a total of 8 electrons. The 3s and 3p orbitals hold another 8 electrons, followed by the 4s and 3d orbitals with a combined total of 20 electrons. Finally, the 4p and 5s orbitals accommodate 7 electrons. Therefore, the core electrons in bromine are the electrons in the innermost energy levels: 1s² 2s² 2p⁶ 3s² 3p⁶. Adding them up, we find that bromine has 28 core electrons. These electrons are not involved in chemical bonding and are shielded by the valence electrons in the outer energy levels.

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Answer:

214.77 g/mol

Explanation:

Tin(II) sulfate

From Wikipedia, the free encyclopedia

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Tin(II) sulfate

Tin(II) sulfate crystallizes in an heavily distorted barium sulfrate structure.

Unit cell of tin(II) sulfate.

Names

Other names

Stannous sulfate

Identifiers

CAS Number  

7488-55-3 ☑

3D model (JSmol)  

Interactive image

ChemSpider  

21106484 ☑

ECHA InfoCard 100.028.457 Edit this at Wikidata

EC Number  

231-302-2

PubChem CID  

62643

UNII  

0MFE10J96E ☑

CompTox Dashboard (EPA)  

DTXSID20884389 Edit this at Wikidata

InChI[show]

SMILES[show]

Properties

Chemical formula SnSO4

Molar mass 214.773 g/mol

Appearance white-yellowish crystalline solid

deliquescent

Density 5.15 g/cm3

Melting point 378 °C (712 °F; 651 K)

Boiling point decomposes to SnO2 and SO2

Solubility in water 33 g/100 mL (25 °C)

Structure[1]

Crystal structure Primitive orthorhombic

Space group Pnma, No. 62

Lattice constant  

a = 8.80 Å, b = 5.32 Å, c = 7.12 Å[2]

Hazards

NFPA 704 (fire diamond)  

NFPA 704 four-colored diamond

010

Flash point Non-flammable

Lethal dose or concentration (LD, LC):

LD50 (median dose) 2207 mg/kg (oral, rat)

2152 mg/kg (oral, mouse)[3]

Related compounds

Other anions Tin(II) chloride, tin(II) bromide, tin(II) iodide

Other cations Lead(II) sulfate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tin(II) sulfate (SnSO4) is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence. It can be prepared by a displacement reaction between metallic tin and copper(II) sulfate:[4]

Sn (s) + CuSO4 (aq) → Cu (s) + SnSO4 (aq)

Tin(II) sulfate is a convenient source of tin(II) ions uncontaminated by tin(IV) species.

Answer: Science and Mathematics- Anthropologist, Meteorologist

Engineering and technology- Fuel Cell Technician, Computer programmer, electrical Drafter, Civil Drafter

Answer:

i have the same question  

Explanation:math and science is the meteorologs and the  anthropologist

Methane gas contributes to the greenhouse effect that is raising atmospheric temperatures. A large portion of all methane emission is from grazing cattle because cows harbor methane-producing archaea from the Methanogen group.

Archaea is one of the three domains of life. In extreme environments, these microorganisms are widely distributed. They have been discovered in a wide range of habitats, including freshwater, marine, and hypersaline environments. Some are even found in soils, sewage, and animal digestive tracts as methane producers. Methanogens are microorganisms that generate methane as a metabolic by-product.

The methane-producing archaea are anaerobic microorganisms that generate methane (CH4) from carbon dioxide (CO2) and hydrogen (H2) gas. Methanogens are frequently found in the digestive tracts of grazing cattle, as well as in wetland soils, landfills, sewage, and deep subsurface environments.

The following are the primary sources of methane emission: Enteric fermentation in domestic livestock (cows, sheep, and goats)Natural wetlands Biomass burning Landfills and wastewater treatment plants Oil and gas production and distribution Agricultural cultivation Livestock management practices

The greenhouse effect is a mechanism in which Earth's atmosphere traps heat and keeps the planet warm. Without the greenhouse effect, Earth's average temperature would be around -18°C (0°F), rather than the current average of 15°C (59°F).

Methane gas contributes to the greenhouse effect that is raising atmospheric temperatures. A large portion of all methane emission is from grazing cattle because cows harbor methane-producing archaea from the Methanogen group.

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Answer:

proton, electron, and neutron

Explanation:

Answer:

Explanation:

the temperture of the warmer water will make it have more space and have less density in the water.

Answer:

It is a method used to identify a suspect.

Explanation:

DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.

Explanation:

20984Po→20582Pb+42α

4520Ca→4521Sc+0-1e+00ν

Explanation:

The alpha decay of polonum-209, which consists of the emission of an alpha particle, will leave behind the atom of a different element.

Notice that the identity of the element changes after the decay. This means that you're dealing with a nuclear transmutation, a process that converts an atom of a given element into an atom of a different element.

A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.

Given that :

Energy of the photon : 1.8 × 10⁻¹² J

Energy of the photon is given by the formula :

E = h v

where,

E = energy of photon

h = Planck constant = 6.626 × 10⁻³⁴ J.s

v = frequency of photon

frequency of photon is given as :

v = c / λ

therefore ,

E = h c / λ

λ = h c /E

c = speed of light = 3 × 10⁸ m/s

λ = (6.626 × 10⁻³⁴ J.s  × 3 × 10⁸ m/s) /  1.8 × 10⁻¹² J

λ = 11.04 × 10⁻¹⁴ m

Thus, A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.

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Answer :Option (a) is the correct answer.

When atoms which are chemically combine to each other through sharing of electrons, that is, forming covalent bonds with each other then the compound formed is known as a molecular compound.

For example,  is a molecular compound.

Generally, non-metals lead to the formation of molecular compounds.

On the other hand, when an electron is transferred from one atom to another then compound formed is known as ionic compound.

For example,  is an ionic compound.

Generally, metals and no-metals on chemically combining together leads to the formation of ionic compounds.

Thus, we can conclude that sulfur, fluorine is the pair of elements which is most apt to form a molecular compound with each other.

First, we write down our reaction:

N2 + 3H2 → 2NH3

Don't forget to balance it.

We only use moles as units.

Procedure:

3 x 1 mole H2 ------------ 2 x 1 mole NH3

3.1 moles H2 ------------- x

x = 2.1 moles NH3 are produced

Answer: 2.1 moles NH3