a student is studying barium, a highly reactive element that is used in some paints. which characteristic of barium is most closely related to its chemical reactivity?

The empirical formula of the sample is KCrO₄

Given that :

Potassium , K = 2.087 g

molar mass of potassium = 36 g/mol

Chromium , Cr = 2.775 g

molar mass of chromium = 52 g/mol

Oxygen , O =  2.988 g

molar mass of oxygen = 16 g/mol

the number of moles of potassium = mass / molar mass

                                                          = 2.087 / 36

                                                          = 0.05 mol

the number of mole of chromium = mass / molar mass

                                                        = 2.775 / 52

                                                         = 0.05 mol

the number of moles of oxygen = mass / molar mass

                                                     = 2.988 / 16

                                                     = 0.18 mol

now diving by the smallest number, we get

moles of K = 1

moles of Ce = 1

moles of O = 4

the empirical formula for the sample is  KCrO₄

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Answer:

2NaCl + F2 -> 2NaF + Cl2

Explanation:

Answer:

2NaCl +F2 = 2NaF + Cl2

reactant product

Na=2 Na=2

Cl=2 Cl=2

F=2 F=2

The significance of the Ronald Cotton case, that a person can be convicted without individual evidence. Therefore, option D is correct.

Evidence is something or information used to increase or decrease the likelihood that a fact exists. Evidence can be testimony, written materials, visual or audio recordings, DNA samples, or other physical artifacts.

In essence, evidence is utilized to support a claim made by people or organizations who think something is real or a fact. Evidence may also be used to debunk or dispute a fact or claim that others don't agree with or believe to be incorrect.

Thus, option D is correct.

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The solubility product constant of this salt is 0.00625 M.

A compound's capacity to dissolve in a given substance is known as its molar solubility (M), which is a unit of measurement. Molar solubility is measured as moles/L and is more specifically the maximum number of moles of a solute that can dissolve in one litre of solvent.

The quantity of moles dissolved in a solution volume of 1 L is known as its molar solubility.

When BaF2 breaks down,

BaF₂ → Ba₂⁺ + 2F⁻

If BaF2 has a molar solubility of X and Ba₂+ and F have molar solubilities of X and 2x, respectively, the solubility product constant -ksp is calculated as follows:

ksp = [Ba²⁺][F⁻]²

ksp = X × (2X)²

ksp = 4X³

since ksp = 7.5 x 10⁻³

4X³ = 7.5 x 10⁻³

X = 0.00625 M

BaF₂ has a 0.00625 M molar solubility.

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The correct oxidation numbers are as follows;

Oxidation states or oxidation numbers are the hypothetical charges of atoms when all bonds to various atoms are fully ionic. Represents the degree of oxidation of atoms in a compound. Conceptually, the oxidation state can be either positive, negative, or zero.

The oxidation number of an atom indicates how many electrons the atom gained or lost when the substance was formed.

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0.72M is the concentration of cl-1 ions when 10.0g of calcium chloride (Cacl2) is dissolved in a solution with a total volume of 250.0ml.

The key here is to realize that a solution of calcium chloride, CaCl2, will always contain twice as many chloride anions, Cl−, than calcium cations, Ca2+.

This means that one mole of calcium chloride, which contains one mole of formula units of calcium chloride, will have one mole of calcium cations, 1× Ca2+ two moles of chloride anions, 2×Cl−.

The sample given to you contains

10.0g ×mole CaCl2 /110.98g

= 0.0901 moles CaCl2

The solution will thus contain

{0.0901moles Ca2+, 2× 0.0901 moles Cl−}

The two ions' respective concentrations will be

[Ca2+]= Ca2+ 0.0901 moles/ 250× 10^-3

= 0.36M

[Cl−]=  Cl−2× 0.0901moles/ 250× 10^-3= 2× 0.36

M= 0.72M

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Answer: I love rats u love rats? HB dogs ? or do you like cats I have a Persian cat and 1 ginger cat his name is ginger Vitus but you can call him ginger or Ginga or bitus and I feed them tuna and cat food do you

The number of moles of HCl produced along with the 2.9 moles of H₃PO₄ is 14.5 moles

From the question, we are to determine the number of moles of HCl that are produced along with 2.9 moles of H₃PO₄

The given balanced chemical equation of the reaction is

PCI₅ + 4H₂O ---> H₃PO₄ + 5HCI

From the balanced chemical equation,

1 mole of PCI₅ reacts with 4 moles of H₂O to produce 1 mole of H₃PO₄ and 5 moles of HCI

Now,

If 2.9 moles of H₃PO₄ are produced from the reaction,

Then,

5 × 2.9 moles of HCl will be produced along with the H₃PO₄

5 × 2.9 =  14.5 moles

Hence, the number of moles of HCl produced is 14.5 moles

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The freezing point of a solution that contains 78. 8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0. 877 g/mL) is

First we need to find out the mass of benzene using volume and density. The formula of density is

density=mass×volume

Rearrange and solve for the mass of benzene

mass=density×volume

mass=0.877g×722 mL/mL

mass=633.194 g

Convert this mass in kg

633.194 g×(1 kg/1000 g)=0.633194 kg

To find freezing point of solution, first we need to find out ΔT_f which is given as

Δ(T_f)=i×(K_f)×m

Where, m-molality

i- Van't hoff factor=1 (as naphthalene is non-electrolyte)

(K_f) = 4.90°C/m

Molality is calculated using formula

molality=(moles of solute/mass of solvent)

The solute is naphthalene and its moles is

mole = 78.8 g×(1 mol/128.16 g)

=0.61486 mol

Hence, the molality of solution is

molality=(0.61486 mol/0.633194 kg)

=0.97104 mol/kg

=0.97104 m (∵m=mol/kg)

Plug all values in the formula

Δ(T_f)=1×(4.90°C/m)×0.97104 m

Δ(T_f)=4.7581°C

The another formula of Δ(T_f) is

Δ(T_f)=T_f(solvent)-T_f(solution)

Rearrange formula for T_f(solution)

T_f(solution)=T_f(solvent)-Δ(T_f)

∴T_f(solution)=(5.50-4.7581)°C

∴T_f(solution)=0.7419°C

T_f(solution)=0.74°C

Therefore, the freezing point of a solution is 0.74°C.

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Product identifier or name information about safe handling practices, Make utilize the MSDS (Material Safety Data Sheet).

Verb: required, requireding. Used with object. to be in need; to require: He needs medical attention. to authoritatively request; command or compel to perform an action: to demand that an agent account of money spent. to demand anything with authority or urgent.

The primary distinction between a need and a requirement is that a need refers to the aims and objectives that a business must accomplish, whilst a requirement refers to the actions we must do to fulfill a need. The terms "need" and "requirement" are occasionally used interchangeably.

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The over all spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.

The over all spatial arrangement of atoms in a protein is called as conformation. The primary structure of protein is called as amino acid.  the local spatial arrangement of the polypeptide chain is explained the  secondary structure. the overall spatial arrangement is called as conformation. The native conformation is the  conformation of functional protein.

Thus, The over all the spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.

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Redox (Oxidation-Reduction) (Oxidation-Reduction) Al2(SO4)3 + H2 from the reaction Al + H2SO4 may be a redox reaction.

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Relationship between resistance and current in a circuit is current is inversely proportional to the resistance

The relationship between current and voltage, resistance is expressed by ohm's law and this states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit and provided the temprature remain constant and hence the relationship between current and resistance could be written as I = VR for constant value of voltage and the current is inversely proportional to the resistance

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Food group has the largest carbon footprint and requires the most water to produce is bovine meat

The carbon footprint is the total amount of greenhouse gases that are generated by our action and the average carbon footprint for a person in the united state is 16 tons and one of the highest rates in the world and globally the average carbon footprint is closer to 14 tons and beef has the highest carbon footprint of any food and this is because of what is required to raise and farm cattle and animals used for beef production require a tremendous amount of feed and which must be grown on its own and they also produce an extremely high amount of methane and meat as well as cheese and eggs have the highest carbon footprint and in the fruits, vegetables as well as beans and nuts have much lower carbon footprint

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The electoral college system creates a population inequity in presidential elections because under the constitution large stated are untitled to fewer electors president then smaller states

The electoral college is the process we use to elect the US president and established in the US constitution and it purpose is to spread the power elect the president across all 50 stated and it was designated to ensure that the more populous state didn't overpower the smaller states when choosing the nation leader and total 538 elector form the electoral college and each elector cast one vote following the general election and the candidate who get 270 votes more win and the newly elected president and vice president are then inaugurated

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Compared to chlorine, sodium is significantly more likely to exist as a cation. This is so because chlorine ionizes with a higher energy than sodium.

The ionization energy is the minimal energy needed to remove the valence electron that is weakly bound from the isolated gaseous atom. As a result, removing one electron from sodium is simple since it will adopt the structure of a noble gas and become stable. Chlorine, however, does not fall into this category, so it has a higher ionization energy than sodium. Because chlorine has a higher ionization energy than sodium, sodium is much more likely to exist as a cation.

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This body part in squid allows them to propel themselves rapidly by sucking in through the mantle and out through the siphon.

The siphon is a large tube at the bottom of the giant squid's body and allows it to move. The giant squid draws air into a siphon and pushes the air out to propel itself forward.

Squids have a tubular bodies and small rod-like internal structures called pens, which help support the squid's body. The mantles help protect the cavity of the squid, as well as help it move, as they suck water in and then push it out.

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Answer:

64.6 in (164 cm)

Explanation:

Answer:5’7

Explanation:

Answer:

3CO + Fe₂O₃ = 2Fe + 3CO₂

The change in temperature of the system is 2.28 °C.

The change in temperature of the system depends on the heat released. The total heat received by the system will equal to total heat released by objects. It should follow

Q released = Q received

The heat can be defined by

Q = m . c . ΔT

where Q is heat, m is mass, c is the specific heat constant and ΔT is the change in temperature.

The given parameters are

Q = 75.4 J

n = 0.25 mol

Mr CCl₄ = 153.8 g/mole

c = 0.861 J / g. °C

Find the mass of CCl₄

n = m / Mr

0.25 = m / 153.8

m = 38.45 grams

Find the change in temperature

Q = m . c . ΔT

75.4 = 38.45 . 0.861 . ΔT

ΔT = 2.28 °C

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The conversion of 1 g of liquid water to 1 g of water vapor, removes heat from the surrounding environment.

Water vapor, water vapor, or aqueous vapor is the gaseous section of water. it's far one state of water in the hydrosphere. Water vapor can be made out of the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like the maximum elements of the environment.

Water vapor is water in gaseous rather than liquid form. it may be fashioned both through a technique of evaporation or sublimation. not like clouds, fog, or mist that is surely suspended debris of liquid water within the air, water vapor itself cannot be seen because it's miles in gaseous form.

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Bradys test is the test used for the qualitative analysis of different types of ketones.

the name of the reagent used in the Bradys test is  2,4-dinitrophenylhydrazine.

it reacts with aldehyde and ketones to give coloured precipitate. 2,4-DNP is red in colour but when it reacts with ketone it gives an orange colour and if it reacts with carbonyl compound and aromatic compound then it gives red precipitate.

now talking about 4-methylacetophenone .yes Bradys test gives positive response to this compound.

when 4-methylacetophenone reacts with 2,4-DNP it gives red precipitate due to hydrazone formation.

bradys give positive test for ketones & aldehyde.

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Taking into account the reaction stoichiometry, the minimum number of grams of ClO₂ that a chemistry must use to make 50 g of HClO₃ is 47.92 grams.

In first place, the balanced reaction is:

6 ClO₂ + 3 H₂O  → 5 HClO₃ + HCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 422.25 grams of HClO₃ are formed from 404.7 grams of ClO₂, 50 grams of HClO₃ are formed from how much mass of ClO₂?

mass of ClO₂= (50 grams of HClO₃× 404.7 grams of ClO₂)÷ 422.25 grams of HClO₃

mass of ClO₂= 47.92 grams

Finally, 47.92 grams of ClO₂ is required.

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Although it is more frequently referred to as lactic acid, the IUPAC nomenclature for it is 2-hydroxypropanoic acid.

Whether in a linear chain or a ring, the main chain of carbons joined by a single bond serves as the basis for IUPAC nomenclature. According to a particular set of priorities, all deviations, whether numerous links or atoms other than hydrogen and carbon are denoted by prefixes or suffixes.

Therefore, the IUPAC name is 2,5,5-trimethyl-2-hexene. The blockchain in example (2) that contains both carbon atoms from the double bond is five atoms long. There is a six chain present, but there is only one double-bonded carbon atom in the chain. Consequently, this compound's root name will be

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An element with the smallest anionic (negative-ionic) radius would be found on the periodic table in group 17 , period 2.

The elements in the periodic table are arranged in the order of the increasing atomic number . the elements are arranged in the groups and the periods in the periodic table. the atomic radius increases as we move from top to bottom in the group and the atomic size decreases as we move from left to right in period in the periodic table.

the ionic radius increases as we move top to bottom in the periodic table and as we move in the periodic table the ionic radius decreases. so, the element with smallest anionic radius is in group 17 and period 2.

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[CO(en)₃]³⁺   is more stable than [CO(CH₃NH₂)]³⁺ to make more stable complex because of chelate effect.

[CO(en)₃]³⁺  is a metal chelate due to presece of bidentate ligand ethylene diamine ligand. Metal chelates are more stable than complexes containing only monodentate ligands because of the chelate effect, we expect ethylenediamine to form a stronger complex with Co than ammonia.

The Chelate Effect is that complexes resulting from coordination with the chelating ligand is much more thermodynamically stable than complexes with non-chelating ligands.

The chelate effect defined as  the augmented affinity of chelating ligands for any metalic ion in comparison of the affinity of a similar nonchelating ligands for the same metallic ion.

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In the scientific notation, the number that we obtain is 4.6 * 10^-10.

We know that in science we often have to deal with very large figure and these figures that we deal with could be quite cumbersome to handle. As such, it is important that we are able to devise a system that can help us to be able to write these values in a way that is simple and this is the origin of the use of the scientific notation.

The scientific notation can help us to be able to shorten the bulk of the figures tat we need to write. In this case we have the figures; 2.3 * 10^-4 * 2.0 * 10^-6 = 4.6 * 10^-10

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The amount of Sr90 remained after a) 19 a is 0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This emission is known as radioactive decay.

What is radioactive decay?

Radioactive decay is a process in which any unstable nucleus loses its energy in the form of radiation. Different types of decays include beta decay, alpha decay and gamma decay in which there is a loss of one or more molecule in the form of radiation.

In radioactive decay,  half life of any atomic nuclei is  the time in which the nucleus becomes half of its initial mass.

λ = 0.693 / t1/2 = 0.693 / 28.1 per year.

t = [2.303 /λ] * log [a / a-x]

a) 19 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.203 = log [10^-6 / a-x]

a - x = 0.625 x 10^-6 g

b) 75 = [2.303/ 0.693] * 28.1 * log [10^-6 / a-x]

0.803 = log [10^-6 / a-x]

a - x = 0.157 x 10^-6 g

Therefore, the amount of Sr90 remained after a) 19 a is  0.625 x 10^-6 g and after 75 a is 0.157 x 10^-6 g. This process is done by beta decay.

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The lewis structure for Chlorine dioxide is present in the attachment.

Lewis structure: The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. When two atoms are bonded together, electrons are depicted as "dots" or as a line.

Octet rule: The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create more stable molecules.

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