What describes an oxidizing agent?.

When the ball was pulled toward the center of gravity is the gravity pulls the ball towards the center of the earth.

The gravity pull the ball towards the center of gravity is due the gravitation force by earth acted on ball. the center of gravity is the point of ball where the weight is distributed in all direction. The center of gravity of uniform ball is at the geometrical centre. if we through a ball in upward direction , the force of gravity pull the ball in downward direction . The force of gravity is directly proportional l to the mass of two objects and inversely proportional to the distance between them.

Thus, When the ball was pulled toward the center of gravity is the gravity pulls the ball towards the center of the earth.

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8.17  is the ph at the equivalence point.

The volume of NaOH used to reach equivalence point

M(HF)*V(HF) =M(NaOH)*V(NaOH)

0.15 M *25.0 mL = 0.15M *V(NaOH)

V(NaOH) = 25 mL

Molarity of HF = 0.15 M

Volume of HF = 25 mL

Molarity of NaOH = 0.15 M

Volume of NaOH = 25 mL

mol of HF = Molarity of HF * Volume of HF

mol of HF = 0.15 M * 25 mL = 3.75 mmol

mol of NaOH = Molarity of NaOH * Volume of NaOH

mol of NaOH = 0.15 M * 25 mL = 3.75 mmol

mol of HF = 3.75 mmol

mol of NaOH = 3.75 mmol

3.75 mmol  of both will react to form F- and H2O

F- here is strong base

F- formed = 3.75 mmol

Volume of Solution = 25 + 25 = 50 mL

Kb of F- = Kw/Ka =  1*10^-14/3.5*10^-4 = 2.857*10^-11

concentration ofF-,c = 3.75 mmol/50 mL = 0.075M

F- dissociates as

F-        + H2O   ----->     HF  +   OH-

0.075                        0         0

0.075-x                      x         x

Kb = [HF][OH-]/[F-]

Kb = x*x/(c-x)

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If a forensic scientist can piece together broken pieces of glass from a bottle that was used as a weapon, it has individual characteristics.

Class features are defined as the properties of evidences which allow group comparison. It contains individual, class, identification, and comparative characteristics.

Individual characteristics is defined as the evidence which is associated with a common source with high certainty degree. The different evidences which are associated with individual characteristics are fingerprints, DNA, striations or pattern of lines on a bullet, glass, torn piece of cloth etc.

Class characteristics are associated with restricted group of people, which includes paint types, different blood groups of the people. Class characteristics are used to narrow down list of possible sources.

Therefore, if a forensic scientist can piece together broken pieces of glass from a bottle that was used as a weapon, it has individual characteristics. Hence, 'option a' is correct.

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Answer: Individual characteristics

Explanation: The reason is that DNA, fingerprints, and blood type can be gained from the broken pieces of the broken glass bottle.

30ml volume of 0.0700 m phosphoric acid is required to neutralize 20.0 ml of .105 m potassium hydroxide.

Any chemical process in which an acid and a base quantitatively combine to produce salt and water is referred to as a neutralisation reaction. H+ ions and OH- ions combine to generate water during a neutralization process.

An acid-base reaction is referred to as a neutralisation reaction. This is so that the reaction's neutral byproducts may be seen. One output is always water, while another output is salt. Among ionic compounds, salts are neutral.

Volume of phosphoric acid (v₁) =?

Volume of potassium hydroxide (v₂) = 20ml

Concentration of phosphoric acid (c₁) = 0.0700 m

Concentration of potassium hydroxide (c₂) = 0.105 m

c₁v₁ = c₂v₂

0.07 × v₁ = 0.105× 20

v₁ = 2.1/0.07

v₁ = 30ml

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The equation that shows a physical change is as follows: H₂O(s) → H₂O(l) (option D).

A physical change is the change affecting the form of a chemical substance, but not its chemical composition.

On the other hand, a chemical change is any process in which reactants are changed into products by the breaking or creation of chemical bonds.

A physical change involves the following;

According to this question, water in solid state (ice) changes in an equation to water in liquid state (water), hence, is an example of physical change.

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The four sections of the pivot table—Report Filter, Column Labeling, Row Labels, and Values—are located at the bottom of the Self - configuration Field List window.

One of the fundamental tools for data is the pivot table. Many significant business concerns can be swiftly resolved with pivot tables.

Pivot Tables can be thought of as a form of visual storytelling even if they are merely tables and lack real graphics.

Most tools demand the somewhat tedious process when comparing two Table or merging them. With some exclusions, like Lumeer, numerous Pivot Table that have the same structure can be laid over.

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Because it neutralizes any residual acids in the reaction mixture, sulfuric acid serves as a proton donor in the this Fischer esterification reaction. Solution is dried using brine, a salt and water mixture.

H2S04, often known as sulfuric acid, is a corrosive chemical that harms the skin, eye, teeth, and lungs. Extreme exposure can be fatal. Worker exposure to sulfuric may be harmful. The dose, timeframe, and nature of the work determine the exposure level.

Sulfuric acid will burn your flesh if you touch it. Your eyes will burn and water if you accidentally put sulfuric acid in them. In these sections, the word "burn" refers to the chemical burn rather than a physical burn brought on by coming into touch with a hot object.

CH3COOH + NaHCO3 —> H2CO3 + CH3COONa

H2CO3 —> CO2 (g) + H2O (gas formed is CO2)

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According to the electronic configuration, elements of group 1,2 and 3 usually form ionic bonds as they have 1,2 and 3 valence electrons.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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H= 52. Alkanes were saturated hydrocarbons, meaning that only hydrogen and carbon atoms are bound together by a single covalent connection to create them. The typical formula for alkanes is CnH2n+2.

Alkanes, commonly known as hydrocarbons, are chemical substances made up of carbon (C) & hydrogen (H) atoms. Alkanes have single bonds as their only chemical constituents. Examples of a chemical compositions of two alkanes, pentane and ethane, are shown in this picture.

Alkanes are significant chemical industry raw materials and the main component of lubricating lubricants and gasoline. Natural gas, which mostly comprises methane and ethane, is used to generate electricity and for cooking and heating (gas turbines).

If n = 25 (25 carbon atoms),

2n + 2 = 2 × 25 + 2 = 52.

H= 52 hydrogen atoms

Formula= C₂₅H₅₂.

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Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, 10L of  H₂S should react with 6.6L of oxygen at stanadard pressure and temperature.

Ideal gas equation is the mathematical expression that relates pressure volume and temperature.

Mathematically the relation between Pressure, volume and temperature can be given as

P×V=n×R×T

where,

P = pressure of gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant = 0.0821 L.atm/K.mol

At Standard temperature and pressure, 2 moles of  H₂S react with 3 moles of 0₂. S0, 10L of H₂S should react with 0.66×10=6.6L of oxygen.

Therefore, 10L of H₂S should react with 6.6L of oxygen.

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A hypothetical element has three isotopes with the mass of 88, 89, and 91 amu. the natural abundance of the isotopes for this element is 80 %, 15 %, and 5 %, respectively. the molecular weight of the element is 88.3 amu.

The mass M1 = 88 amu

the mass M2 = 89 amu

the amu M3 =91 amu

the 1st isotopes abundance = 80 % = 80 / 100 = 0.8

the 2nd isotopes abundance = 15 % = 15 / 100 = 0.15

the 3rd isotopes abundance = 5 % = 5 / 100 = 0.05

the average molecular weight = 88× 0.8 + 89 × 0.15 + 91 × 0.05

                                                  = 70.4 + 13.35 + 4.55

                                                  = 88.3 amu

The molecular weight of the element = 88.3 amu.

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Fluorine (F) is an element that has the most similar chemical properties to iodine based on location in the periodic table.

The halogen elements, namely fluorine, chlorine, bromine, and iodine, are elements of the halogen or VIIA group in the periodic table of elements. These elements have ns2 np5 valence electrons. The reactivity of a substance is related to the ease with which the outer electrons of an element's atom can be released (metals) or captured (non-metals). Since the group VIIA elements are non-metallic elements that tend to gain electrons, their reactivity is directly proportional to their electron affinity. The greater the electron affinity, the easier it is for the atom to react (capture 1 electron). Because in a group of halogen elements the electron affinity decreases from top to bottom, so the topmost element, fluorine, is the element with the greatest electron affinity. This means that the fluorine element is the most reactive among the halogen elements.

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The hollow sphere has the higher rotational kinetic energy.

A hollow sphere is a ball that has been hollowed out so that an internal ball within the external ball is created by a wall of similar thickness.

In comparison to solid ones, hollow spheres are 40 to 70 percent lighter. An air current is used to lift and hold polystyrene balls over a fluidized bed as a suspension made of metal powder and a binder is sprayed onto them to begin the process.

I(hollow sphere) = 2/3 mr squared

I(solid sphere) = 2/5 mr squared

KE(r) = 1/2 I w squared

I(h) > I(s)

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A film production lab was found to be using chemicals improperly, according to OSHA. The lab was given six months to fix the issue. The laboratory was still not up to par when the deadline rolled around. This violates the law of failure to abate(C).

OSHA's Occupational Exposure to Hazardous Chemicals in Laboratories standard (29 CFR 1910.1450), refer to as the Laboratory standard, designates the required necessities of a Chemical Hygiene Plan (CHP) to insulate lab employees from harm due to perilous projectiles for weaponry.

Laboratory standard resides of five main items in accordance with OSHA:-

Congress devised OSHA to promise reliable and healthful environments for active people interested in something by scene and prosecuting principles and providing preparation, exceed, instruction, and agreement help.

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The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.

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False. The flammability of the cosmos does not decrease in a system where H2 burns in O2 to generate h2o (l). H2 does not catch fire.

Among the most typical dangerous compounds discovered in a laboratory are flammable liquids. The main danger posed by flammable liquids is that they easily ignite and burn. A flammable liquid, according to the National Fire Protection Association (NFPA), is one whose flash point is less than 100°F (38°C).

They consist of petroleum-based fuels like gasoline and kerosene as well as fossil fuels including coal, natural gas, and petroleum. Paper and cardboard are examples of materials produced of wood .

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Water has the chemical formula H20 and is composed of atoms bound together to form molecules.

The correct answer is A,D

A molecule is the tiniest unit of any substance that is capable of independent existence and that is made up of one or more components while still maintaining the substance's physical and chemical properties. Even more atoms can be separated from molecules. The symbols for the oxygen atom and molecule, respectively, are O and O2, respectively.

The term "life's four fundamental sorts of molecules" is frequently used. Proteins, carbohydrates, lipids, and nucleic acids make up the four molecules that make up life. For every living thing on Earth, each of the 4 groups is essential. A cell and an organism cannot exist without any one of these four molecules.

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What is heat absorption?

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His first interpretation was that the crystals phosphoresced when they were exposed to light, exposing the film. Option D

We know that  Becquerel is generally credited as the one that was the pioneer of the technology of radioactivity. We know that he was the first person that found out that when we expose d uranium salt crystals to sunlight, the photographic paper became exposed even though it was shaded from the sun by a dark cloth.

He was unable to give a correct interpretation to this experiment until he had to carry out further studies that led to the discovery that the crystals actually gave off radiation.

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6) Cobalt - [Ar] 3d⁷4s²

7) Silver -[Kr] 4d¹⁰5s¹

8) tellurium - [Kr] 4d¹⁰ 5s² 5p⁴

9) radium - Rn 7s²

10) lawrencium - [Rn] 5f¹⁴ 7s² 7p¹

11) 1s² 2s² 2p⁴ 3s² 3p⁶ 4s² 3d¹⁰4p⁶ 5s¹ - strontium

13) [Kr] 5s² 4d¹⁰ 5p³- antimony atom

14) [Xe] 6s² 4f¹⁴ 5d⁶ - Osmium

15)[Rn] 5f¹⁴ 7s² 7p¹ - Einsteinium

16) 1s² 2s² 2p⁴ 3s² 3p⁶ 4s² 4d¹⁰ 4p⁵ - Bromine

17) 1s² 2s² 2p6 3s² 3d⁵ - Chlorine

18) [Ra]7s²5f⁶ - Einsteinium

19) [Kr] 5s² 4d¹⁰ 5p⁵ - Tellurium

20) [Xe] - Xenon.

The shell number (n) is the first symbol used to represent an electron configuration, followed by the type of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.

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The purpose of injecting air into the vial of diluent equal to the amount of diluent needed to reconstitute the drug is to allow the diluent draw easily.

The purpose of the diluent injection in a reconstitute a drug for injection is to dilute and dissolve the drug. The reconstitute the drug is to allow the diluent draw easily.  2 needles and syringes are needed to reconstitute a drug. An up - side angle should be hold the vial of diluent. Roll the vial in your hand is the technique to mix the drug and the diluent.

Thus, The purpose of injecting air into the vial of diluent equal to the amount of diluent needed to reconstitute the drug is to allow the diluent draw easily.

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When 1-methylcyclohexene interacts with HCl, the methyl-substituted carbon atom receives an addition of bromide ion to create 1-chloro-1-methylcyclohexane.

One or more chemicals transform into one or more other compounds in a chemical reaction. When vinegar and baking soda are combined, sodium acetate, carbon dioxide, and water are the results.

Alkenes are hydrocarbons containing a single double bond, and the suffix "ene" is used to name them. Alkenes respond better in an addition reaction, including 1-methylcyclohexene. The double bond will be shattered, and the replacements will be offered to them.

The carbons of the broken bond will receive H and Cl during the reaction with HCl. When H is inserted at the least replaced carbon, the main product is created. Therefore, the item will be 1-chloro-1-methylcyclohexane.

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CF3 forms an electronic arrangement of tetrahedral shape. However due to the repulsion between bonded pair and lone pair of electrons, they acquires a molecular shape of trigonal bipyramidal.

Carbon trifluoride is a covalent compound formed between carbon and fluorine through electron sharing . However, one pair electron is unbonded here because this compound exists as a radical cation.

The valency of carbon is 4. But there are only 3 fluorine atoms to bond. Thus, one pair exists as radical. The electron arrangement looks like a tetrahedral structure.

However, there occurs repulsion between the negative clouds of the bonds from the fluorine atoms and the lone pair -bond pair repulsion is even higher, the lone pair locates at the axial position and thus form a trigonal bipyramidal geometry.

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The atomic mass of the element is the weighted average of the atomic masses of the naturally occurring isotopes of an element.

The atomic mass (ma) of a chemical element is the mass of an atom at rest, generally expressed in atomic mass units. Atomic mass is often synonymous with relative atomic mass, average atomic mass, and atomic weight. However, there is a slight difference in that the values can be either weighted averages of the masses of all isotopes of an element, or the masses of just one isotope. As is the case for an element that has only one dominant isotope, the atomic mass value of the very abundant isotope can be almost the same as the atomic weight value of that element. As elements whose isotopes are generally more than one, the difference in the value of the atomic mass with the atomic weight can be up to more than half a mass unit (for example chlorine). The atomic mass of a rare isotope can differ from the standard atomic weight by several mass units.

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The mass of a KHP needed to neutralize the 20.3 ml of a 0.274M of a potassium hydroxide(KOH) solution is 1.14g.

The reaction between KHP and KOH is given as

KHC₈H₄O₄+KOH→K₂C₈H₄O₄+H₂O

From given data, first find out moles of KOH

moles=20.3 ml×(1 L/1000 ml)×(0.274 mol/1 L)

moles=(20.3×0.274 mol/1000)

moles=(5.5622 mol/1000)

moles=0.0055622 mol

Since mol to mol ratio between KOH and KHP is 1:1. Hence, the moles of KHP required is 0.0055622 mol. Convert this moles into the mass

The molar mass of KHC₈H₄O₄ is

Molar mass=[39+(5×1)+(8×12)+(4×16)]g/mol

=(39+5+96+64)g/mol

=204g/mol

Hence, mass of KHP required is

mass=0.0055622 mol×(204 g/1 mol)

mass=1.1346 g=1.135g

mass=1.14 g

Therefore, the mass of KHP required to neturalize potassium hydroxide is 1.14 g.

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Hydraulic fracturing is known as fracking and it uses pressurized liquids to fracture rock formations that hinder access to natural gas.

Hydraulic fracturing, or “fracking” as it's miles extra commonly known, is simply one small approach of the broader technique of unconventional development of oil and herbal fuel. Fracking is a proven drilling era used for extracting oil, natural fuel, geothermal electricity, or water from deep underground.

Fracking is brief for hydraulic fracturing, which is the manner of making fractures in rocks and rock formations by means of injecting specialized fluid into cracks to pressure them to open similarly. the larger fissures permit greater oil and gas to drift out of the formations and into the wellbore.

Hydraulic fracturing is used to grow the charge at which materials such as petroleum or natural fuel may be recovered from subterranean herbal reservoirs. Reservoirs are normally porous sandstones, limestones or dolomite rocks, but also encompass "unconventional reservoirs" which include shale rock or coal beds.

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The precipitate which is formed by chemical reaction between sodium hydroxide and calcium bromide is calcium hydroxide whose chemical formula is Ca(OH)₂.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

There are four types of chemical formula:

1)empirical formula

2) structural formula

3)condensed formula

4)molecular formula

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It is true that seminal fluid has a 400-fold greater quantity of the prostate's released acid phosphatase enzyme than any other body fluid.

An enzyme is a type of biological catalyst that is typically always a protein. It accelerates a certain chemical process in the cell. The enzyme is not destroyed during the procedure; it is continually used.

For instance, the enzyme pepsin is a vital component of gastric fluids and aids in the breakdown of food particles in the stomach. Similar to how salivary amylase, an enzyme that converts starch into sugar to help with early digesting The thrombin enzyme is used in medicine to hasten wound healing.

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i) The initial volume of the gas is 4.6 L

ii) The temperature of the gas is 212.7 K

We know that work can be done by a gas when the gas expands because the gas is pushing against the walls of the container and as such we have the use of the formula;

W = PΔV

W = work done

P = pressure of the gas

V = volume of the gas

Now;

The work done is 3000 J or 29.6 Latm

29.6  = 1(25 - V1)

V1 = initial volume

29.6 = 25 - V1

V1 = 29.6 - 25

V1 = 4.6 L

Now we have to obtain the temperature of the gas during the cause of the isothermal expansion of the gas as follows;

W =nRTln(V2/V1)

n = Number of moles

R = gas constant

T = temperature

3000 = 1 * 8.314 * T ln(25/4.6)

3000 = 14.1T

T = 3000/14.1

T = 212.7 K or -60.3°C

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In order to create an electron configuration with the lowest energy level that is stable, electrons from the s-orbitals may occasionally be elevated to a higher energy level.

In example, the 4s and 3d orbitals have n=4 and l=0, respectively, meaning that n+l=4+0=4 and n=3 and l=2, respectively, mean that n+l=3+2=5. As a result, 4s will be filled first before going on to the 3d orbital since 4s has a lower energy of 4 compared to the 3d orbital, which has a greater energy of 5.

The fourth energy level typically comprises 18 electrons. The 4s 3d and 4p orbitals are part of the periodic table's fourth energy level. There are 6 electrons in the 4p orbital. The 4d orbital has 10 electrons and corresponds to the periodic table's fifth energy level.

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