the extrinsic pathway of coagulation is initiated by the

Empirical formulae are the ratios of atoms in a compound that show the lowest possible ratio of atoms per mole of compound.

In this question, we are to find the empirical formulae for the following ions:

OCl³⁻, NH⁴⁺, CH₃CO₂⁻ and Pb⁴⁺

Empirical formula for OCl³⁻:Oxygen (O) forms an anion by gaining three electrons to form the oxide ion, O²⁻

The ClO₃⁻ ion has one O²⁻ and three Cl⁺ ions. Therefore, the empirical formula is OCl³⁻

Empirical formula for NH₄⁺ :Nitrogen (N) forms a cation by losing three electrons to form N₃⁺ while Hydrogen (H) forms a cation by losing an electron to form H⁺. Therefore, the empirical formula for NH₄⁺ is NH₄⁺

Empirical formula for CH₃CO₂⁻

The ion contains 2 Carbon atoms, 3 Oxygen atoms, and 4 Hydrogen atoms. Divide each number of atoms by the lowest number (2) to give the empirical formula: CH₃CO₂⁻

Empirical formula for Pb⁴⁺:Lead (Pb) forms a cation by losing four electrons to form Pb⁴⁺.Therefore, the empirical formula for Pb⁴⁺+ is Pb⁴⁺.

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The primary safety hazard associated with dichloromethane (methylene chloride) is its potential to cause serious health effects if it is inhaled or absorbed through the skin.

Dichloromethane is a colorless, volatile liquid with a sweet odor. It is commonly used as a solvent in various industrial and laboratory applications. Exposure to high concentrations of dichloromethane vapor can cause dizziness, headache, nausea, and even unconsciousness. Prolonged exposure can lead to more serious effects, including liver and kidney damage, as well as cancer. In addition, dichloromethane can be absorbed through the skin, and contact with the liquid can cause irritation or chemical burns. It can also react with other chemicals to form potentially explosive or toxic compounds. aTherefore, appropriate safety measures such as good ventilation, protective clothing, and gloves should be used when handling dichloromethane. It is also important to dispose of it properly and not to mix it with other chemicals unless under controlled conditions.

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The coupling reaction of two radicals is b. exothermic and involves one arrow.

A radical is a chemical entity that contains an unpaired electron in its valence shell, which makes it highly reactive. Molecules that contain an unpaired electron are referred to as "free radicals." Coupling reactions between free radicals involve the interaction of two free radicals, both of which have an unpaired electron. A covalent bond is created when these two free radicals join together, effectively eliminating the unpaired electron. This coupling reaction can be exothermic or endothermic based on the number of arrows present.

For two radicals, only one arrow is needed for the exothermic coupling reaction. The reaction is exothermic, and heat is produced as a result of the reaction. The energy produced by the bond-forming reaction overcomes the energy of the starting materials. This energy that is generated raises the kinetic energy of the product's components. As a result, the temperature of the system increases. For two radicals, the endothermic coupling reaction requires two arrows. The reaction absorbs energy, causing the temperature of the system to decrease.

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Answer:

a) Acidified potassium dichromate solution is used to test for the presence of a primary or secondary alcohol.

b) The orange color of the potassium dichromate solution is reduced to green when it reacts with an alcohol.

c) The oxidation of a primary alcohol produces a carboxylic acid.

d) The oxidation of a secondary alcohol produces a ketone.

e) The dichromate test does not work for tertiary alcohols because they cannot be further oxidized. Methylpropan-2-ol is a tertiary alcohol with the chemical structure:

CH3

|

CH3—C—OH

|

CH3

Since there are no hydrogen atoms attached to the carbon atom bearing the hydroxyl group, it cannot be oxidized.

a) A simple test for the presence of a carboxylic acid group is the addition of sodium hydrogencarbonate solution to the compound. The reagent reacts with the carboxylic acid to produce carbon dioxide gas.

Reagent: Sodium hydrogencarbonate solution

Observation: Effervescence (bubbling) due to the release of carbon dioxide gas.

b) To confirm that the gas produced in the hydrogencarbonate test is carbon dioxide, it can be tested with limewater. Carbon dioxide turns limewater milky/cloudy due to the formation of calcium carbonate.

c) The hydrogencarbonate test is not conclusive proof that a carboxylic acid group is present in a completely unknown compound because some other functional groups such as phenols and alcohols can also react with the reagent and produce carbon dioxide. Therefore, additional tests such as the dichromate test or Tollens' test may be needed to confirm the presence of a carboxylic acid group.

(please could you kindly mark my answer as brainliest and a follow would be really nice)

Answer: Before Rutherford

Explanation:

The plum pudding model was proposed by J.J. Thomson in 1904, before the experiments conducted by Ernest Rutherford in 1909 that led to the discovery of the atomic nucleus. Therefore, the correct answer is "Before Rutherford".

Answer:

Before Bohr and Rutherford

Explanation:

The plum pudding model was proposed by J.J. Thomson in 1904, before both Ernest Rutherford's gold foil experiment in 1911 and Niels Bohr's atomic model in 1913. Therefore, the correct answer is before Bohr and Rutherford.

When 315 J of energy is irreversibly transferred to a sample of water at 25°C, the entropy shift is roughly 1.056 J/K.

The entropy change when 315 J of energy is reversibly transferred to a sample of water at 25°C can be calculated using the equation:

ΔS = qrev/T

where ΔS is the change in entropy, qrev is the amount of heat transferred reversibly, and T is the temperature in Kelvin.

Converting the temperature to Kelvin by adding 273.15:

T = 25°C + 273.15 = 298.15 K

Substituting the given values:

ΔS = 315 J / 298.15 K

ΔS ≈ 1.056 J/K

Therefore, the entropy change when 315 J of energy is reversibly transferred to a sample of water at 25°C is approximately 1.056 J/K.

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The volume of the gas will decrease from 20 cm³ to 13.08 cm³.

Boyle's law is a gas law that states that the product of the pressure and volume of a gas is constant at constant temperature.

Assuming no change in temperature is significant because it allows us to apply Boyle's law to solve the problem. If the temperature were to change, we would need to use a different gas law, such as Charles's law or the combined gas law, to account for the change in temperature.

We can use Boyle's law to solve this problem, which states that the product of the pressure and volume of a gas is constant at constant temperature. Mathematically, we can express this as P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, respectively, and P₂ and V₂ are the final pressure and volume, respectively.

Using this equation, we can solve for V₂:

P₁V₁ = P₂V₂

V₂ = (P₁V₁)/P₂

Substituting the given values, we get:

V₂ = (510 mmHg x 20 cm³) / 780 mmHg

V₂ = 13.08 cm³

Therefore, if the pressure is increased from 510 mmHg to 780 mmHg at constant temperature, the volume of the gas will decrease from 20 cm³ to 13.08 cm³.

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Isotopes are different forms of an element that have different atomic masses. The number of protons in each atom of an element will remain the same, but isotopes of an element will have different numbers of neutrons, leading to different atomic masses.

Isotopes are different forms of an element that have different numbers of neutrons in their nuclei. The number of neutrons in an atom can vary from one to several, depending on the element. Isotopes are atoms of an element that differ in the number of neutrons present in their nucleus. The atomic number of an element is determined by the number of protons present in the nucleus. However, the isotopes of the same element differ in their mass numbers. The atomic mass of an element is determined by the number of protons and neutrons present in the nucleus.

The atomic number of an atom is the sum of the number of protons in the nucleus and the number of electrons in a neutral (non-ionized) atom. Each atomic number designates a particular element, but not an isotope; the number of neutrons in an atom of a given element can vary widely. Each isotope of an element has a particular mass number, which is determined by the number of nucleons (both protons and neutrons) in the nucleus. Therefore, the isotopes of an element have different atomic masses.

Isotopes can be radioactive or stable, depending on the number of neutrons present in the nucleus. For instance, carbon-14 is a radioactive isotope of carbon, while carbon-12 is a stable isotope.

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Answer:

To solve this problem, we need to apply the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. This means that the total mass of the reactants must be equal to the total mass of the products.

We start by writing a balanced chemical equation for the reaction between baking soda and vinegar:

NaHCO3 + CH3COOH → NaCH3COO + H2O + CO2

This equation tells us that one mole of baking soda (sodium bicarbonate) reacts with one mole of vinegar (acetic acid) to produce one mole of sodium acetate, one mole of water, and one mole of carbon dioxide.

We can use the molar masses of the compounds involved to convert the given masses into moles:

84 g of baking soda is equivalent to 0.8 moles (84 g / 84 g/mol)

60 g of vinegar is equivalent to 1.0 moles (60 g / 60 g/mol)

18 g of water is equivalent to 1.0 moles (18 g / 18 g/mol)

82 g of sodium acetate is equivalent to 1.0 moles (82 g / 82 g/mol)

The effect of low [s] is that the rate of the reaction will decrease and the effect of high [s] is that the rate of the reaction will increase. When Vo is one-half of Vmax, the effect is that the reaction has reached its half-maximum velocity, or that the reaction has reached its maximum efficiency.

The rate of the reaction will decrease in the case of low [s] as the substrate concentration is too low to support the reaction. On the other hand, the rate of reaction will increase in the case of high [s] as there is a greater amount of substrate to drive the reaction.

To understand these effects in a better way, we can use the Michaelis-Menten equation to calculate the rate of reaction at various substrate concentrations (Vo and Vmax) and also the reaction's maximum velocity (Vmax):-

V = Vmax[S]/(Km + [S])

Where Vmax is the maximum velocity of the reaction, Km is the Michaelis constant, and [S] is the concentration of the substrate.

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a) potassium hydrogen tartrate (KHC4H4O6) is acidic. Ka is calculated for the acidic characteristics of the molecule. When a proton is donated by the molecule to water, it forms the ion HCO4-. b) Kb = [C4H4O6-2][OH-]/[HC4H4O6-], Kb = (1.0 × 10-11) × [C4H4O6-2][OH-]/[HC4H4O6-]. c) As the ion HC4H4O6- is an acidic ion, it will have acidic characteristics in solution. It is because the ion can donate protons and act as an acid.

Kb is calculated for the basic characteristics of the molecule. The balanced chemical equation for the reaction is as follows:HC4H4O6-(aq) + H2O(l) ⇌ C4H4O6-2(aq) + OH-(aq)The Kb is determined using the equation given below : Kb = [C4H4O6-2][OH-]/[HC4H4O6-]The Ka value is calculated as shown below: Kb = [C4H4O6-2][OH-]/[HC4H4O6-]Kb = (1.0 × 10-11) × [C4H4O6-2][OH-]/[HC4H4O6-]

The balanced chemical equation for the reaction is as follows: HC4H4O6(aq) + H2O(l) ⇌ HCO4-(aq) + H3O+(aq)The Ka is determined using the equation given below : Ka = [HCO4-][H3O+]/[HC4H4O6]Ka = (1.0 × 10-3) × [HCO4-][H3O+]/[HC4H4O6]. Therefore, the Ka value is not given.

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The pH of a solution of ammonium-based buffer containing 0.175 M ammonium bromide and 0.0836 M acetic acid is 9.26.

What is the pH of this solution?

A buffer is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. It resists changes in pH when small amounts of acid or base are added to it.

For the buffer solution to work, its pH should be within the acid dissociation constant, Ka of the weak acid and the weak base, Kb. In this question, the buffer is made up of ammonium bromide and acetic acid. The Ka for the acetic acid, CH3COOH is 1.74 x 10-5. It is a weak acid. The buffer pH can be calculated using the Henderson Hassel-balch equation.

Henderson Hassel-balch equation pH = pKa + log ([A-] / [HA]) Where, A- is the conjugate base and HA is the weak acid, pKa is the negative logarithm of Ka, pKa = -log Ka = -log (1.74 x 10-5), pKa = 4.76. Ammonium bromide will act as a salt in this solution, and its conjugate base will be ammonia.

NH4Br → NH4+ + Br-NH4+ will combine with OH- to form ammonia, NH3 and water.NH4+ + OH- → NH3 + H2OIn this reaction, OH- will be added to the buffer.

To calculate the pH of the buffer, we need to know the concentration of NH4+ and NH3 at equilibrium. NH4+ will come from the ammonium bromide, and NH3 will come from the reaction above.The ammonium bromide dissociates as follows:

NH4Br → NH4+ + Br-

Therefore, [NH4+] = 0.175 M. The concentration of NH3 will depend on the OH- concentration, which will be used up in the reaction. We need to know the Kb of NH3 to calculate the concentration of NH3 at equilibrium.

Kb for NH3 is 1.8 x 10⁻⁵ NH3 + H2O ↔ NH4+ + OH

-Kb = [NH4+] [OH-] / [NH3]

Kb = [NH4+] [OH-] / [NH3]But [NH3] = [NH4+] as they are in equal amounts, so;

Kb = [OH-]

Kb = 1.8 x 10-5[OH-] = 1.8 x 10-5.

The pOH = - log (1.8 x 10-5) = 4.74.

The pH of the buffer = 14 - pOH = 9.26

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Answer: how many years does it take for plastic to decompose?

Well, it depends on the plastic,  regular plastic can take up to 20 years to decompose, however, plastic bottles can take up to 450 years to decompose.

Answer:

1,2,1,2

Explanation:

The gradual spread of perfume from a localized area to fill the entire room exemplifies the second law of thermodynamics.

This law states that in any isolated system, the total entropy (a measure of disorder or randomness) always increases over time. In this case, the perfume molecules initially have a high concentration in the corner of the room and low concentration in the rest of the room. However, as time passes, the perfume molecules spread out and become more evenly distributed throughout the room.

This process increases the entropy of the system, as the perfume molecules become more randomly arranged and disordered. The second law of thermodynamics thus predicts the natural tendency of systems to move from a state of lower entropy to higher entropy over time.

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There is a small gap left between the rails of a railway track Reason (R): Cooling of substances result in contraction. Both A and R are true but R is not the correct explanation of A,

When a substance is cooled, it means that the heat is removed from the substance. This results in fewer excited molecules and, as a result, less random motion. The force of attraction increases, resulting in fewer spaces between molecules, which causes contraction.

The gaps left between successive rails on a railway track as a result of the rails expanding in the summer. The gap exists to allow for this expansion. If no gap is left, the summer expansion will cause the rails to bend sideways. This will lead to train accidents.

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The  molecule that is the main product of the Calvin cycle is glucose. The Calvin cycle is also known as the light-independent reactions.

It is a series of biochemical reactions that occur in the stroma of the chloroplast in photosynthetic organisms to produce glucose. The Calvin cycle is made up of three stages: Carbon fixation, Reduction and regeneration of ribulose bisphosphate. Here's a breakdown of each stage:

Carbon fixation: Carbon dioxide enters the Calvin cycle and is converted to organic molecules. During carbon fixation, Rubisco, which is a crucial enzyme in photosynthesis, catalyzes the reaction between carbon dioxide and ribulose bisphosphate, leading to the formation of a six-carbon molecule that splits into two three-carbon molecules. This three-carbon molecule is the starting material for the reduction process.

Reduction: The ATP and NADPH produced during the light-dependent reactions are used to convert the three-carbon molecule produced during carbon fixation into glyceraldehyde-3-phosphate. This process involves a series of biochemical reactions that require the use of energy from ATP and electrons from NADPH.

Regeneration of ribulose bisphosphate: Glyceraldehyde-3-phosphate, which is the main product of the Calvin cycle, is used to regenerate the starting material for carbon fixation, ribulose bisphosphate. During this stage, ATP is used to convert the remaining glyceraldehyde-3-phosphate molecules into ribulose bisphosphate. The Calvin cycle is an essential process in photosynthesis, as it produces glucose, which is the main source of energy for plants and other photosynthetic organisms.

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Answer:

A gas with a constant volume had an original pressure of 1150 torr and a temperature of 75.0 ℃. Pressure was decreased to 760 torr. What is the final temperature of the gas?a. -43.0 ℃b. 49.6 ℃c. 230 ℃d. -251 ℃

To shift the potential of the lead-zinc cell upward, toward 0.70 V, the following actions would give the desired result:

Add some concentrated Pb(C2H3O2)2 solution to the Pb2+/Pb couple

Adding some concentrated Zn(C2H3O2)2 solution to the Zn2+/Zn couple

Any action that makes [Zn2+] larger than [Pb2+]

A lead-zinc cell is a galvanic cell consisting of lead and zinc electrodes immersed in a suitable electrolyte. The potential of the lead-zinc cell is the difference in electrode potential between the lead and zinc electrodes, as determined by their concentration gradient.

Therefore, to shift the potential of the lead-zinc cell upward, toward 0.70 V, one should add some concentrated Pb(C2H3O2)2 solution to the Pb2+/Pb couple, add some concentrated Zn(C2H3O2)2 solution to the Zn2+/Zn couple, and any action that makes [Zn2+] larger than [Pb2+].

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Note that the specific examples of ecosystem services that  coral reefs provide for other ecosystems are given in the attached table.

Ecosystem services are the benefits humans derive from the natural environment, such as food, water, and clean air.

Ecosystem services are important because they provide essential resources for human well-being and support economic development.

Some example explained are:

Provisioning: Fisheries provide a source of food and income for many communities. Timber is a key resource for the construction and paper industries. Crop pollination is necessary for agriculture and food production.

Supporting: Soil formation provides the foundation for plant growth and food production. Nutrient cycling replenishes soil fertility and supports plant growth. Habitat provision supports biodiversity and the provision of other ecosystem services.

Regulating: Pollination is essential for plant reproduction and the production of crops. Water purification removes harmful contaminants from drinking water. Climate regulation helps to mitigate the impacts of climate change.

Cultural: Recreation provides opportunities for people to engage with nature and promotes physical and mental well-being. Aesthetic value refers to the beauty and cultural significance of natural landscapes. Spiritual and religious values are often associated with natural environments and provide cultural and social benefits.

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The standard reduction potential of the cathode half-reaction is -0.36V,

The standard reduction potential of the anode half-reaction is +0.34V,

and the standard potential of the cell is -0.02V.

The cathode half-reaction is the reduction of iron (Fe²⁺) to iron (Fe):

Fe²⁺ + 2e⁻ -> Fe; E°cathode = -0.36V.

The anode half-reaction is the oxidation of copper (Cu) to copper (Cu²⁺):

Cu -> Cu²⁺ + 2e⁻; E°anode = +0.34V.
The standard potential of the cell is determined by subtracting the standard reduction potential of the anode from the standard reduction potential of the cathode:

E°cell = E°cathode - E°anode

= -0.36V - (+0.34V)

= -0.02V.

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When benzoquinone is treated with excess butadiene, the products obtained are 2,5-dimethylcyclohexadiene-1,4-dione and cyclohexene.

Benzoquinone is also known as 1,4-benzoquinone or cyclohexa-2,5-diene-1,4-dione, is a colorless organic compound. The presence of two carbonyl groups in its structure provides it its characteristic quinone chemistry.

Butadiene, also known as 1,3-butadiene, is a conjugated diene. The reaction between benzoquinone and butadiene is called a Diels-Alder reaction.

The Diels-Alder reaction is a conjugate addition reaction that joins a diene and a dienophile to create a new six-membered ring. The most important characteristic of the Diels-Alder reaction is its stereospecificity. This reaction occurs between a cyclic diene and an alkene or alkyne dienophile.

The products obtained when benzoquinone is treated with excess butadiene are:2,5-dimethylcyclohexadiene-1,4-dioneCyclohexeneThe reaction proceeds with the dienophile (benzoquinone) being attacked by the diene (butadiene) in the Diels-Alder reaction to produce a cyclic adduct. The product is 2,5-dimethylcyclohexadiene-1,4-dione. Cyclohexene is formed as a byproduct of the reaction.

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At PH 1.2, the indicator will appear red.

Universal indicator- The universal indicator is a mixture of 4 common indicators allowing for a large pH range to be measured.

At pH 7, the indicator will appear yellow due to bromothymol blue. The universal indicator (or parts thereof) are in equilibrium and have an associated K value.

K value- The K value indicates the amount of products and reactants present in the reaction. It is an equilibrium ratio of the concentration of products and the reactants.

A universal indicator is made by mixing bromomethyl, methyl orange and phenolpthalein in alcohol.

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The factors that favor SN2 reactions are Strong nucleophile, good leaving group, polar aprotic solvent, methyl or primary halide.

SN2 reactions require a strong nucleophile, good leaving group, polar aprotic solvent, and a methyl or primary halide. The reason for this is that SN2 reactions occur in a single step, with the nucleophile attacking the substrate and the leaving group departing at the same time. When the nucleophile approaches the substrate, it must be in a good orientation to cause an SN2 reaction.The best orientation for SN2 reactions occurs when the substrate is methyl or primary, the solvent is polar aprotic, the nucleophile is strong, and the leaving group is good. When the leaving group departs, it must be able to do so quickly, so a good leaving group is required. Finally, the solvent must be polar aprotic, which means that it can stabilize negative charges while not inhibiting the reaction by solvating the substrate.

The nucleophile attacks the substrate from the rear in order for this reaction to continue. The angle of the nucleophile's approach to the supplied substrate with respect to the carbon-leaving group bond is 180o. Through a transition state, the carbon-nucleophile bond forms and the carbon-leaving group bond dissolves simultaneously.

The needed product is now created when the leaving group is forced out of the transition state on the other side of the carbon-nucleophile connection. It's crucial to remember that the product is created by inverting the tetrahedral geometry at the central atom.

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Answer:

Because CO2 combines chemically with water to form a weak acid called carbonic acid, water can hold perhaps 1,000 times more CO2 than either nitrogen or oxygen at saturation.

Explanation:

What is carbon dioxide (CO2)?

Carbon dioxide (CO2) is a colorless, odorless gas that occurs naturally in the Earth's atmosphere. Carbon dioxide is a waste gas produced by animals and humans during respiration and combustion. It is also produced by plants and algae during photosynthesis.

Carbon dioxide is an important greenhouse gas that contributes to climate change.CO2 can combine chemically with water to form a weak acid called carbonic acid. Because of this, water can hold perhaps 1,000 times more CO2 than either nitrogen or oxygen at saturation.

Carbonic acid can dissolve calcium carbonate, which is found in marine organisms' shells and is a vital component of coral reefs. As the acidity of the ocean increases as a result of increasing CO2 concentrations, this can have a significant impact on these organisms.

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Ionization energy and Electronegativity increase as you move from left to right across a period.

A period is a row in the periodic table of elements. It consists of elements with a similar number of atomic orbitals. The table is arranged so that elements with the same number of valence electrons are located in the same group, making it easy to identify the properties of elements.

Ionization energy is the energy required to remove an electron from a neutral atom in its gaseous state.

Electronegativity is the measure of an atom's ability to attract electrons to itself.

As we move from left to right across a period, the effective nuclear charge increases, thus both ionization energy and electronegativity increase.

Therefore, the correct options are A)  Ionization energy and C) Electronegativity.

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The correct answer is: In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity.

Transpiration and photosynthesis are both processes that involve the use of water by plants.

Transpiration is the process by which water evaporates from the leaves of a plant and is released into the atmosphere. This occurs through tiny openings on the surface of leaves called stomata. The water that is lost through transpiration is replaced by water absorbed by the roots of the plant from the soil.

Photosynthesis, on the other hand, is the process by which plants use water, along with carbon dioxide and sunlight, to produce oxygen and glucose. During photosynthesis, water is split into hydrogen and oxygen, and the oxygen is released into the atmosphere as a byproduct. The glucose that is produced is used as a source of energy by the plant.

In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.

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Answer:

Its A

Explanation:

Got it right on the quiz

Dolostone is composed of the mineral dolomite, which is similar to calcite in limestone, except that dolomite contains magnesium.

Dolostone, also known as dolomite rock, is a sedimentary rock composed mainly of the mineral dolomite. Dolomite, a calcium magnesium carbonate mineral, is the primary component of dolostone, making up around 90-95 percent of the rock. Dolostone is a rock that is similar to limestone and is often mistaken for it.

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The salt which you would test if you wanted to observe how just anions affect pH is Na2CO3.

What is salt? Salts are inorganic compounds made up of a cation and an anion. Salts are formed by the neutralization of an acid with a base, for example, hydrochloric acid and sodium hydroxide form table salt: NaCl. The cation is typically a metal or a positively charged organic compound, whereas the anion is generally a non-metal or a negatively charged organic compound. The salt's properties are a function of the cation and anion and are hence unique.

Salt's effect on pH: Salts are made up of cations and anions, both of which can have an impact on pH. Cations and anions can both have an impact on the pH of the solution, but they can do it in different ways. The pH of a solution can be affected by the anion of the salt since it can act as a base or an acid. The pH of a solution can be affected by the cation of the salt since it can act as an acid or a base. For instance, if we dissolve copper sulfate in water, the pH of the solution will be acidic since the sulfate ion will be hydrolyzed to create sulfuric acid, H2SO4.

However, if we dissolve sodium carbonate in water, the pH of the solution will be basic because the carbonate ion acts as a base, picking up H+ ions from water molecules to generate HCO3- ions. Hence, Na2CO3 is the salt which you would test if you wanted to observe how just anions affect pH.

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Answer: clear the area of anything flammable such as hair, chemicals, Ect.