Explain why onions make you cry

In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.

Henri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo

In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.

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A pedigree chart shows Inherited traits in a family; the correct option is C

A pedigree chart is a chart that shows how traits are passed on from parents to offspring.

A pedigree chart is used in the study of inheritance or genetics.

A pedigree chart can for example be used to study the inheritance pattern of traits such as sickle cell anemia. In such a pedigree chart, the genotype of the parents is used to study how the trait is being transferred and can also predict the likelihood of the offspring of the parents inheriting that trait.

A pedigree chart can also be used to backtrace how a particular trait came into a particular family.

In conclusion, a pedigree chart is a chart that shows how traits are passed on from the parents and offspring of a family.

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Trial 4's half-life of the reaction is shorter than Trial 1's half-life. Because the activation energy and half life are both precisely related. In comparison to trail 4, trail 1 activation energy is higher.

A reaction's t1/2, or half-life, It occurs when the concentration of a reactant is halved from its starting concentration. T1/2 is used to represent it.

Activation energy is the required amount of energy to start the reaction. Kilojoules per mole (kJ/mol) is the unit used to measure the activation energy (Ea) of a reaction. Activation energy is the force that causes an object to begin acting in a certain way or to start a specific process.

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You take in that you need to make a decision. Try to notice and define the nature of the decision you must make. This first step is very important.

Decision-making requires the identification and selection of alternatives on the basis of values, linking, requirements, and beliefs. To begin the procedure objectives must be defined, classified, and ordered in the order of their importance. Decision-making involves the recognition and selection of alternatives on the basis of values, preferences, concerns, and beliefs.  Decision-making means selecting a course of action from two or more alternative strategic decision-making (SOM) is of great and growing importance.

So we can conclude that attribute of Decision Making · It is a process of selecting a course of action from among the alternative courses of action.

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Answer:

C.. Group I element they dissolve in water to form alkaline solution

B.. Element between group II and III and most of them form coloured compound

A... Group VII element they react with metals to form salts

We can say that When K3PO4 is dissolved in water , the number of potassium ions present in the solution is three times the number of phosphate ions in the solution .

What are Ionic compounds ?

Ionic compounds can be defined as ionic bonds or chemical bonds formed by oppositely charged ions held together by electrostatic forces.

These are usually formed between metals and non-metals. Atoms always tend to acquire stable electronic configurations when atoms lose electrons to form cations, and anions are formed when atoms gain electrons. These two oppositely charged atoms together form an ionic bond, which is called an ionic bond.

Ionic compounds, also called ionic compounds, are held together by electrostatic forces. Ionic compounds are also formed when the electronegativity difference between two atoms is large. This causes one atom to attract more electrons than the other, resulting in electron loss and electron gain within the atom.

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Stoichiometry is the representation of balanced chemical equation, that involves the amount or quantities of reactants and products involved in the reaction.

In a chemical equation, stoichiometry is the relation between two or more substances. Stoichiometry can be the definite proportions in which elements or compounds react with one another. The rules followed in calculating the stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes.

For example:

N2 (g) + 3H2(g) → 2NH3(g)

In the above reaction, Nitrogen (N2) and Hydrogen (H2) react to form Ammonia (NH3).

1 molecule + 3 molecules = 2 molecules

       There is another concept known as the stoichiometric coefficient, this gives us the number of molecules that are participating in the reaction.

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Answer:

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What happens to electrons when an ionic bond forms?

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It is the prior distribution of electrons that constitutes the electrostatic force of interaction..

Explanation:

Commonly, ions are formed by (i) the loss of electrons from metals... electron rich materials from the left of the Periodic Tables as we face the Table, whose valence electrons are furthest removed from the positively charged nuclear core... and (ii) the gain of electrons by non-metals to the right of the Periodic Table as we face it.

We could represent these processes by the reaction...

M→M

n+

+ne

−

oxidation

X+e

−

→X

−

reduction

We add the two redox processes together in such a way that the electrons are eliminated as virtual particles and we get a neutral salt... of a material and a non-metal that are held together by a strong electrostatic force of attraction...

M+nX→MX

n

And thus the electrons are formally redistributed to give positive and negative ions that combine to form NEUTRAL SALTS.

Explanation:

permutit is an artificial zeolite chemically it is

hydrated sodium aluminum orthosilicate with the formula

Na2AI2Si208. XH20

A heat shield is essentially a thermal barrier intended to keep things from overheating. The automotive industry to isolate the engine block to stop heat damage to the bodywork and internal parts.

A heat shield is essentially a thermal barrier intended to keep things from overheating. They are frequently employed in the automotive industry to separate the engine to stop heat damage to the bodywork and internal parts.

If the heat becomes too high, plastic engine parts may melt or deform, and belts may also become damaged. You should schedule a visit with your mechanic right away if you start to smell burning emanating from your car or discover that the engine hood is too hot to touch.

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Answer:

reactivity, flammability,toxicity some more

Considering the Dalton's partial pressure, the the total pressure of the Heliox mixture is 1.1 atm.

Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

[tex]P_{T}[/tex]= P₁ +P₂ + ... + Pₙ

where n is the amount of gases present in the mixture.

This relationship is due to the assumption that there are no attractive forces between the gases.

In this case, the total pressure of the Heliox mixture is calculated as:

[tex]P_{T} =P_{He} +P_{O_{2} }[/tex]

Being:

the total pressure of the Heliox mixture is

[tex]P_{T}[/tex]= 0.75 atm + 0.35 atm

[tex]P_{T}[/tex]= 1.1 atm

Finally, the total pressure is 1.1 atm.

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Answer:  The alkali metals will lose an electron to resemble the next lowest noble gas; thus, all the alkali metals form +1 ions. K loses an electron so that it will have the same electron configuration as Ne.

1A or group 1

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The electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.

Periodic table is defined as a tabular approach of showing the items so that they appear in the same vertical column or group when their attributes are similar. Phosphorus is the oldest chemical element, and hassium is the newest. Please take note that, unlike in the Periodic system, the elements do not exhibit their natural relationships with one another.

The elements that make up group 17 of the periodic table are the halogens. They are nonmetals that are reactive, such as iodine, bromine, chlorine, and fluorine. Halogens are non-metals that are very reactive. These substances share a lot of characteristics with one another.

Thus, the electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.

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Answer:

Solution X is a base, and solution Y is an acid

Explanation:

PH for acidic is 1 to 6

PH for neutral is 7

PH for alkaline is 8 to 14

The new concentration results in 0.512 M.

The concentration of a substance is the quantity of solute found in a given amount of solution. Concentrations are normally expressed in terms of molarity, defined because of the variety of moles of solute in 1 L of answer.

Calculation:-

final conc=m1v1+m2v2/(v1+v2)

final conc=209 × 0.71+407 ×0.41/(407+209)

final conc = 0.512 M

Concentration is the abundance of a constituent divided by way of the overall volume of an aggregate. several sorts of mathematical descriptions may be outstanding: mass concentration, molar concentration, variety concentration, and extent awareness.

The Concentration of an answer is a measure of the quantity of solute that has been dissolved in a given amount of solvent or answer. A concentrated answer is one that has a rather huge quantity of dissolved solute.

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The type of quantitative chemical method was used to determine the precise concentration of hydroxide in the experiment is titration.

Titration is quantitative chemical method used to determine the concentration of unknown solution by using the known concentration of solution. the solution with the known concentration is called as the titrant. the solution of the unknown concentration is called as analyte. titrant is added from burette to known quantity of solution of unknown concentration that is analyte until the reaction is complete.

Thus, The type of quantitative chemical method was used to determine the precise concentration of hydroxide in the experiment is titration.

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Work is entropy free and it does transfer entropy but the claim is not valid, the entropy of a fluid passing through an adiabatic steady state system with a single outlet and inlet can change due to irreversibilities present in the system during the process.

What is entropy?

Why doesn't entropy change when there is a work transfer?

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The summary of the paragraph is that if you live on a high latitude there would be greater seasonal variation.

The equator is said to be that imaginary line that does divide the earth into the Northern and the southern Hemispheres. This implies that the equator is the line that divides the earth into to halves and the two haves of the earth are responsible for the variations in many things on earth such as the day and night experience.

We can see from the passage that if you are living in a position that is closer to the equator then it follows that the variation of day and night would have less difference as well as less of seasonal differences.

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The must be true of the two elements is All of the above.

An element is a substance composed of only one type of atom that cannot be broken down into simpler substances by either physical or chemical processes. They are divided into metals, non-metals, and semi-metals. Helium is the element with atomic number 2 in the periodic table. Each helium atom has two protons in its nucleus.

The atomic weight of the element is 4.0026. Helium is known as a gas in its pure form because it does not combine easily. A compound is a unique substance formed by the chemical combination of two or more elements. Compounds are formed through chemical reactions. Elements of a compound are held together by chemical bonds.

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The concentration of water in such a solution in mol/l is 0.0157 M.

Molar concentration is a measure of the concentration of a chemical species, particularly of a solute in an answer, in phrases of quantity of a substance per unit quantity of solution. In chemistry, the most commonly used unit for molarity is the range of moles consistent with liter, having the unit symbol mol/L or mol/dm³ in the SI unit.

Molarity (M) is the quantity of a substance in a certain volume of solution. Molarity is described as the moles of a solute consistent with liters of an answer. Molarity is likewise called the molar attention of a solution.

Calculation:-

The density of the solution is 1.41 g/mL.

1000 g of the solution will have a volume = Mass/ Density

                ​ =  1000 / 1.41

                     =709 ml.

The mass percent of nitric acid is 70%.

1000 g of the solution will have = 1000× 70/100

                                                       =690 g of nitric acid.

The molarity of the solution is  = Mass of nitric acid / The molar mass of nitric acid ×Volume of solution.

Mass of nitric acid = 700 / 63×709

                              = 0.0157 M.

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Yes as the temperature increases the solubility of NH3 will decrease and as we increase the pressure solubility of NH3  increases.

Solubility is defined as the maximum amount of substance that will dissolve in a given amount of solvent at a given or specified temperature. Based on solubility different types of solutions can be obtained. A saturated solution is a solution where a saturated solution is a solution where a given amount of solute is completely soluble in the solution.

Whereas a supersaturated solution are those where solute starts precipitating out after a certain concentration.

Temperature does effect the solubility of NH3 because as  the temperature increases the hydrogen bonding also decreases, due to which the NH3 molecules are no longer able to bind to water molecules hence their solubility decreases.

But as we increase the pressure on NH3 molecules the bonding with the water molecules will be higher and therefore the solubility also increases.

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A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

Alkynes are hydrocarbons which contain carbon-carbon triple bonds. Their general formula is CnH2n-2 for molecules with one triple bond (and no rings).  the compound contains 6 Carbon atoms, its said to be an alkyne therefore compound should contain a triple bond.

There should be single C as chiral centre. This means that one carbon has 4 different groups attached to it. In the diagram shown has one carbon connected to

1- Hydrogen

2 - CH3 group

3 - C2H5 group

4 - C≡CH

All these groups are of different types, hence the C is a chiral centre .

therefore A six-carbon alkyne that can exist as diastereomers is 3-methyl-1-pentyne.

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Three straight chains containing 12 carbon atoms, 2 oxygen atoms  at the end is a saturated triglyceride.

What are saturated triglycerides?

Saturated triglycerides contain entirely of carbon-carbon single bonds in the structure. They have higher melting point compared to unsaturated triglycerides. Consuming saturated triglycerides in the large amount may lead to several cardiovascular diseases. Foods with high concentration of saturated triglycerides are butter, some fatty meats and cheese.

The saturated triglycerides are made up of carbon-carbon single bonds containing maximum number of hydrogen atoms. Unlike, saturated fats, unsaturated fats have carbon-carbon double bonds in them.

Therefore, 3 straight chains containing 12 carbon atoms, 2 oxygen atoms  at the end is a saturated triglyceride.

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Before the reaction of hydrogen peroxide, if a reagent had changed color immediately after being added to the sample, this would indicate the presence of a contaminant and the test would be invalid.

The above experiment is also knowns as a presumptive blood testing experiment in which if a contaminant is present, the test should be deemed invalid if a vivid blue or purple color appears after adding the TMB reagent but before adding the hydrogen peroxide; this is also frequently referred to as a "false positive" result.

Presumptive tests catalyze the oxidation of a chromogenic substance, which results in a color change, by reacting with the hemoglobin of all blood in humans and animals. If the test is positive, the material will be identified as potentially blood, though not necessarily human blood.

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The combination of the chlorine and the chromium species is designated by the reaction [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]. Option B

We know that the term reaction has to do with the way in which two atoms are combined in a compound. Now, the reaction must be balanced. This implies that the number of atoms on the reactant side must be the same as the number of atoms on the products side.

We are talking about how to write the reaction between the chromium atom and the chlorine atom. We know that we have to find out which of the reaction is balanced and that is; [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]

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The given question is incomplete and the complete question is

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ What is the enthalpy change to burn 38.4 g of ammonia?​

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ and the enthalpy change to burn 38.4 g of ammonia is

Ammonia means NH₃ is one of the most commonly produced industrial chemical

Here given data is

ΔΗ = -1267 kJ

And the balanced reaction is

4 NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)

We have to calculate enthalpy change to burn g of ammonia = ?

First calculate the moles corresponding to 38.4 g NH₃

The molar mass of NH₃ is 17.03 g/mol

38.4 g ×1mole/17.03 g/mol = 2.25 mol

Then calculate the enthalpy change to burn 2.25 mol of ammonia

And according to the thermochemical equation 1267 kJ are released per 4 mole of ammonia that react

2.25 mol×(-1267kJ/4 mol) = -713 kJ

Enthalpy change to burn 38.4 g of ammonia is  -713 kJ

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The number of mole of air in the ball, given that the volume of the ball is 5.2 litres is 0.13 mole (Option A)

We'll begin by listing out the given parameters from the question. This is given below:

From the above parameters, we can obtain the number of mole as follow

PV = nRT

61 × 5.2 = n × 8.314 × 305

317.2 = n × 2535.77

Divide both sides by 2535.77

n = 317.2 / 2535.77

n = 0.13 mole

Thus, the number of mole is 0.13 mole (Option A)

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cyclohexanone is the compound which is shown.

what is cyclohexanone-

The chemical substance known as cyclohexanone has the formula (CH2)5CO. The compound is a six-carbon cyclic molecule with a functional group called a ketone.

IUPAC (International Union of Pure and Applied Chemistry) nomenclature is based on the naming of a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.

six-carbon ring with oxygen bonded to one of the carbon atoms in the ring is cyclohexanone.

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As per this case the test tube will be heated so the unwanted gas will be wiped out and only the vapors of our gas will sustain in the flask

what are flasks used for?

There are different types of flasks used in chemistry laboratories they are mainly used for weighing chemicals, preparing stock solutions, preparing reacting solutions and many more.

The test tube will only contain the vapour that is necessary to compute the molar mass because, as you heat this gas, you are producing enough vapour to drive away the air and keep the liquid's vapour present. so that there is no need to weigh the flask before heating the volatile liquid

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