What is the perimeter of a polygon 8cm 6cm, 4cm, 6cm

Answer:a

Explanation:

A smoke test is used to determine the amount of soot in flue gases. so, the correct option among the given choices is a. soot in flue gases.

A smoke test is a method used to visually inspect and evaluate the flow of air or other gases through a system. In particular, it is used to identify the presence and location of leaks or blockages in the system. The test involves introducing a small amount of smoke or a similar substance into the system, and observing its movement to identify any areas where the smoke accumulates or escapes. This test is used to determine the amount of soot in flue gases The source of the smoke can be a specialized smoke generator or smoke candles, which are small, slow-burning sticks of wax coated with a smoke-producing substance. Smoke tests are commonly used in a variety of settings, including HVAC systems, plumbing systems, and automotive engines, to identify leaks or other issues affecting the efficiency and safety of the system.

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To increase the solubility of oxygen in water, you would need to increase the partial pressure of oxygen (P.O2) while keeping the external pressure (P.ext) constant. Thus, option (A) is the correct choice.

According to Henry's law, the solubility of a gas in a liquid is directly proportional to its partial pressure. By increasing the partial pressure of oxygen, more oxygen molecules will be available to dissolve into the water. This results in a higher concentration of dissolved oxygen in the water.

In contrast, options (B), (C), and (D) would not lead to an increase in oxygen solubility. Decreasing the partial pressure of oxygen (B) or increasing the external pressure (C) would cause a reduction in the available oxygen molecules, resulting in lower solubility. Similarly, decreasing the external pressure (D) would not affect the solubility of oxygen since the partial pressure remains constant.

Therefore, the most effective way to increase the solubility of oxygen in water is by increasing the partial pressure of oxygen while keeping the external pressure constant.

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Answer:

A.ns .is d ok I think it was very much helpful to you

The rate law for a reaction can be derived from the stoichiometry of the rate-determining step.

The rate law is an equation that tells how the rate of a reaction depends on the concentration of each species present. A rate equation is a chemical expression that relates the rate of reaction to the concentration of reactants. The stoichiometry of the rate-determining step, and therefore the reaction's rate law, is determined by experimental data.

Here are some factors to consider in determining the rate law experimentally:i. Each reactant's initial concentration is changed.ii. The reaction's rate is determined.iii. The effect of each reactant's concentration change on the reaction's rate is determined.iv. This information is utilized to determine the reaction's rate law.

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The rate law for a reaction can be derived from the stoichiometry of the rate-determining step.

The correct answer is stoichiometry of the rate-determining step. The rate law for a reaction describes the relationship between the rate of the reaction and the concentrations of the reactants. It can be determined experimentally by measuring the rate of the reaction at different reactant concentrations. The stoichiometry of the rate-determining step, which is the slowest step in the reaction mechanism, determines the rate law.

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There are a total of four possible stereoisomers for 1,2-dimethylcyclopropane. This is because there are two methyl groups on the cyclopropane ring, which can be either on the same side (cis) or opposite sides (trans) of the ring.

Additionally, each of these configurations can be either R or S stereoisomers. Therefore, there are four possible stereoisomers: cis-R, cis-S, trans-R, and trans-S. It is important to note that pairs of enantiomers (such as cis-R and cis-S) are counted as two different stereoisomers because they are mirror images of each other and cannot be superimposed. Overall, understanding the stereochemistry of molecules like 1,2-dimethylcyclopropane is crucial in fields such as organic chemistry, where understanding how molecules interact and react with one another is essential.

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the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

The false statement among the options is  An acid-base indicator can be non-polar. Option e is correct answer.

An acid-base indicator is a substance that undergoes a color change in the presence of an acid or a base. It is typically a weak acid or a weak base that can exist in different forms, each having a different color. When an indicator is in its acidic form, it may be represented as an acid (option a) and have a specific color. Similarly, when it is in its basic form, it can be considered as a base (option c) and exhibit a different color. Therefore, options a and c are true statements.

Furthermore, an indicator can have one highly colored form (option b) or two highly colored forms (option d), depending on its acid-base equilibrium and the pH of the solution. For example, litmus is a commonly used indicator that exists in two forms: red in acidic solutions and blue in basic solutions.

However, the statement in option e, that an acid-base indicator can be non-polar, is false. Acid-base indicators are typically polar compounds because they contain functional groups that are involved in acid-base reactions. The polar nature of the indicator molecules allows them to interact with polar solvents and participate in the necessary chemical reactions for color changes.

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Answer: The loose objects will tend to move to the right inside the car.

Explanation:

The options include:

A. The loose objects will tend to move to the left inside the car.

B. The loose objects will tend to move to the right inside the car.

C. The loose objects will tend to move toward the front of the car.

D. The loose objects will tend to move toward the back of the car.

Based on the question, we are informed that Mary is driving on a straight road and then a deer jumps in front of her, which made her turn her car sharply to the left.

The loose objects inside the car will move towards the opposite direction. Since Mary made a left turn, the loose objects in the car would move to the right.

MALDI-TOF MS has certain advantages over ESI-MS viz.

(i) MALDI-TOF MS produces singly charged ions, thus interpretation of data is easy comparative to ESI-MS,

(ii) for analysis by ESI-MS, prior separation by chromatography is required which is not needed for MALDI-TOF MS analysis (Everley et al., 2008).

Matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry (MS) has become a widely used technique for the rapid and accurate identification of bacteria, mycobacteria and certain fungal pathogens in the clinical microbiology laboratory.

MALDI is the abbreviation for "Matrix Assisted Laser Desorption/Ionization." The sample for MALDI is uniformly mixed in a large quantity of matrix. The matrix absorbs the ultraviolet light (nitrogen laser light, wavelength 337 nm) and converts it to heat energy.

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Answer:

Explanation:

1. In a titration, a 25cm3 sample of nitric acid, HNO3, was used to react with 100cm3 of 0.50 mol/dm3 sodium hydroxide (NaOH) solution.

A) Calculate the number of moles of sodium hydroxide used.

the NaOH has 0.5 moles each liter, so 10 ml has 0.05 moles

B) Calculate how many moles of nitric acid react.

1 mole of HNO3 REACTS WITH ONE MOLE OF NAOH

SINCE NAOH WAS 0.05 MOLES, HNO3 WAS 0.05 MOLES

C) Calculate the concentration of nitric acid in mol/dm3.

THESE MOLES OF HNO3 WERE IN 25/1000 L OR 25x10^-3L

SO THE CONCENTRATION OF HNO3 IS

0.05 MOLES/ (25X10^-3) = 2MOLES/LITER

CHECK

2 MOLES/LITER HAS 0.2 MOLES IN 100 ML AND 0.2/4=0.05 MOLES IN 25 ML

TLC means Thin Layer Chromatography. It is a method that can best be described as "Affinity-Based" used in the separation of compounds that are in a mixture.

Unreacted p-nitrobenzaldehyde is simply an organic aromatic compound that contains a nitro group para-substituted to an aldehyde. in this case, if it is unreacted, that means it is the same as before the chemical reation.

Note that the question is missing key information hence the general answer.

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Answer:

If FDA finds that the evidence supporting the proposed claim is credible and the claim can be qualified to prevent it from misleading consumers,

fda.gov

Explanation:

Although soils are capable of resisting pH changes, there are some circumstances where the pH of the water can result in alterations.

The texture of soil affects how susceptible it is to the pH of the surrounding water. Smaller soil particles, such as clays and clay loams, have a greater impact than larger, sandier soils. There are more colloids, which are extremely minute particles, in fine-textured soils. Positively charged ions are maintained at these colloids. The cation exchange capacity of a soil refers to its capacity to hold onto these ions. Ions on the colloidal particles trade places with ions in the soil solution. The pH of the soil is less affected by negative ions in the soil solution.

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Answer:

a soft, spongy material that may be changed into coal

Explanation:

If you combine the results of this question with the results from question 3B, what do you know about the total pH change caused by adding the last 0. 1 mL of HNO3 it is now an acid.

A chemical that gives off hydrogen ions in water and forms salts by combining with certain metals. Acids have a sour taste and turn certain dyes red. Some acids made by the body, such as gastric acid, can help organs work the way they should. An example of an acid is hydrochloric acid.Nitric acid is a nitrogen oxoacid of formula HNO3 in which the nitrogen atom is bonded to a hydroxy group and by equivalent bonds to the remaining two oxygen atoms.

Nitric acid is made by reaction of nitrogen dioxide ( NO 2) with water. The net reaction is: 3 NO 2 + H 2O → 2 HNO 3 + NO. Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide.

pH may be defined as a measure of free acidity. More precisely, pH is defined as the negative log of the hydrogen ion concentration. The range of pH extends from zero to 14. A pH value of 7 is neutral, because pure water has a pH value of exactly 7.

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Answer:

Steam is an invisible gas

Explanation:

so A. Gas

Answer:

gas

Explanation:

sodium hydroxide

cobalt (II) phosphide

lead (IV) carbonate

Magnesium fluoride

lithium sulfite

ammonium phosphate

iron (II) oxide

calcium sulfate

silver nitride

sodium sulfide

Explanation:

hope the picture above help u understand I did it in step so it would be easier to understand:)

A and e may be verified by scientific experimentation. B and D are untestable and subjective. Although c is a testable hypothesis, it is dependent on a number of variables, including a person's health and nutrition.

You can test the following scientific experimentation: Which things are attracted by a magnet: a metal paperclip, a copper coin, or aluminium foil a) Do medium-sized Red Delicious apples or medium-sized Green Granny Smith apples have more seeds The other queries, such as "Why do people consume cigarettes," "What happens to your blood glucose level if you don't eat lunch," and "Which planet is the most intriguing to research," are not testable using scientific means. Since at least the 17th century, the scientific method—an empirical approach to learning—has guided the advancement of science. It requires close observation.

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The Cationic molecular ions are more abundant than Anionic molecular ions because capacity of cationic to stabilise unpaired electrons make synthesis of cationic molecular ions less energetically demanding.

The capacity of cationic molecular ions to stabilise unpaired electrons makes the synthesis of cationic molecular ions less energetically demanding. The most advantageous reason for the abundance of cationic molecular ions is that the cosmic ray has so much energy that it is largely unaffected by the comparatively little energy necessary to ionise molecules. There is ample of radiation from a broadband source like the Sun to drive the molecules to high energy states from which they can be triggered and spontaneously emit. As a result, cationic molecular ions outnumber anionic ones.

Because of the low temperature and density of interstellar space, the most prevalent cationic molecular ion is H3+. Because its two electrons are sole valence electrons in the system, this H3+ is also thought to be a major source of cationic molecular ions.

Another reason for their prevalence is their capacity to stabilise unpaired electrons, which makes the production of cationic molecule ions less energetically demanding.

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The ice particles have a lower average kinetic energy. Consequently, ice is distinct from the water vapour that develops as the water starts to boil.

Chemistry defines an object's kinetic energy as the amount of work it produces when in motion. Activities like walking, climbing, tossing, and dropping consume kinetic energy.

Kinetic energy is a type of energy that a moving object or particle has. When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy. A moving object or particle's kinetic energy, which depends on both mass and speed, is one of its properties. Any combination of movements, including translation, rotation along an axis, and vibration, may be used as the kind of motion.

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Change in volume is 0 m3 when three moles of a monatomic ideal gas undergoes an isochoric process in which the temperature changes from 500 k to 300 k.  

An isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process in thermodynamics, is a thermodynamic process where the volume of the closed system having undergone such a method remains constant.

In everyday life, we see an isochoric process once we boil the water in a pressure cooker. Because the temperature increase is accomplished at a constant volume, we encounter an isovolumetric process when we transfer heat to the container.

In this problem we have T1=500K T2=300K

Since in isochoric process volume in constant, change in volume = 0

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Answer:

False

Explanation:

Reaction order is always defined in terms of both reactant and product concentrations. True or false?

False. The number of species whose concentration directly influences the rate of reaction is indicated by the sequence of reactions. The reactant concentrations are always used to specify the sequence of the reactions (but not with product concentrations).

The power dependence of the rate on the concentration of each reactant is the definition of the order of reaction. The rate law of a reaction can be used to fully comprehend the composition of the reaction mixture once that rule has been established. In other words, the reaction order is an exponent that increases the concentration of a certain species, and it demonstrates the extent to which this concentration impacts the rate of reaction. Additionally, it shows the range in which the species has a large impact.

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Answer:

salt i know the answer and even sugar is

Answer:

10^-7.20 or 1×10^-7.20mol.dm^-3

Explanation:

[H3O^+]= -log[H3O^+]

=antilog(-pH)

=antilog(-7.20)

=10^-7.20 mol.dm^-3

Answer:

1.58 x 10^-7 M

Explanation:

The color of phenolphthalein indicator in a solution of hydrochloric acid will be colorless.

Phenolphthalein is a weak acid that changes color over a pH range of 8.2 to 10.0, going from colorless to pink as the pH increases. In a solution of hydrochloric acid, the pH is less than 8.2, so the phenolphthalein will not be pink, but will remain colorless. This indicates that the solution is acidic, with a pH lower than 8.2.

Phenolphthalein is often used in laboratory experiments, especially in the field of chemistry, to determine the endpoint of titrations and to monitor the pH changes during a reaction.

The color change of phenolphthalein occurs because the pink form of the indicator is a weak base and the colorless form is a weak acid. In an acidic solution, phenolphthalein will exist in its colorless, acidic form, and in a basic solution, it will exist in its pink, basic form. The exact pH range over which the color change occurs depends on the concentration of the phenolphthalein solution, but it is typically between 8.2 and 10.0.

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Answer:

the cheta

Explanation:

kinetic means movement

Answer:

C

Explanation:

Read it from my 8th grade text book a few years back.

Answer:

C   l i f e

Explanation:

The kind of the energy that is store in the chemical bond is the type of the potential energy.

The kind of the energy that is store in the chemical bond is the type of the potential energy. The Potential energy is the energy that is not be in  used yet, but the energy that is is stored and in awaiting the use. The chemical bond is the example of the potential energy. The bonds formed in between the atoms and the molecules in the substances hold the energy.

Thus, the potential energy is stored in the chemical bond formed in between the atoms or the molecules.

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