In a reaction a + b ----> c, reactant a has 5g and product c has 9g. How many grams does reactant b should have?.

the half-life of the reaction is 50min

Half life of the reaction is actually the time required for the reaction to reach one half of its initial concentration or sometimes pressure too. The half-life of a specific radioactive isotope remains constant and so it is unaffected by conditions and is independent of the initial amount of that isotope.

To calculate the half life of the reaction we use the below given formula;

K = 2.303 × log 100

      94.9             25

K = 0.014

Half life = 0.693    ⇒ 0.693

                   K               0.014

Half life = 49.5 ≈ 50min

Therefore the half-life of the reaction is 50min.

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Answer: H2O

Explanation: Water is made from 2 hydrogen atoms and 1 oxygen atom bonded together.

Answer: H₂O

each molecule of water is made up of two hydrogen atoms, H, and a single oxygen atom,  O.

The compounds of ionic substances with the most exothermic lattice energy are:

Correct answer: letters B, C y D.

This is because these ionic substances have the most exothermic lattice energy because they form ionic bonds, which are very strong, and these three alkali metals are in the first row of the periodic table.

The compounds of ionic substances with the most exothermic lattice energy are those in which the ions have the largest difference in electronegativity.

The lattice energy of an ionic substance is the energy required to completely separate the ions in the solid state. The compound with the most exothermic lattice energy is the one that is the most stable. In general, the larger the ionic radius, the more exothermic the lattice energy.

Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?

Group of answer choices:

a) NaCl, KCl

b) LiF, LiCl

c) Mg(OH) 2, MgO

d) Fe(OH) 2, Fe(OH) 3

e) NaCl, Na 2

​f) MgO, BaS

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The mass of 4 atoms of c is less than the mass of 3 atoms of element d then the c element has more atoms/gram

Mass is a measure of the amount of matter in a substance or an object

Here given data is

4 atom of c

3 atom of d

We have to calculate element has more atoms/gram = ?

So 4 atom of c < 3 atom of d

So the so c has larger molar mass so c ahs the more atom/gram

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Answer:

X = electrons from hydrogen

O (black) = electrons from oxygen

O (red) = electrons from when it was connected to a metal atom, hence why it has a negative charge

The high electropositive nature results in a low enthalpy of ionization and a low melting point. So when you add sodium to the water, it reacts violently to produce NaOH and H2.

Since alkali metals like sodium have only one valence electron they tend to donate that electron to nonmetals to achieve stability. They usually react fastest with halogens such as chlorine fluorine iodine and bromine. Because these halogens have seven valence electrons. Sodium is much more active than hydrogen, so it reacts violently with water.

Sodium is more reactive than lithium because it is larger. The outermost electrons are less strongly retained in sodium than in lithium. As a result, sodium loses its outermost electrons more easily than lithium. Therefore, it is more reactive than lithium. Of the options given, the reaction between chlorine and potassium is the most violent. Because, according to the periodic characteristics, the reactivity of potassium and chlorine is very high.

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The percentage yield when 305g of AgNO3 are reacted in an excess of MgCl producing 23.7g of Mg(NO3)2 is 7.77g

Yield, also known as reaction yield, is a measurement of the number of moles of a product created in a chemical reaction relative to the reactant consumed. It is typically given as a percentage yield.

Formula to calculate the percentage yield:  percent yield = actual yield/theoretical yield x 100

Acc. to the given data:

Actual yield = 23.7g

Theoretical yield=305g

So to find the percentage yield = actual yield/theoretical yield x 100

Percentage yield = 23.7/305 x100

Percentage yield=7.77g

Hence The percentage yield when 305g of AgNO3 are reacted in an excess of MgCl producing 23.7g of Mg(NO3)2 is 7.77g

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The mole fraction of acetyl bromide in this solution is 0.39.

Calculation:-

The molar mass of CH3COBr,

MM = 2*MM(C) + 3*MM(H) + 1*MM(O) + 1*MM(Br)

= 2*12.01 + 3*1.008 + 1*16.0 + 1*79.9

= 122.944 g/mol

Molar mass of C6H6,

MM = 6*MM(C) + 6*MM(H)

= 6*12.01 + 6*1.008

= 78.108 g/mol

n(CH3COBr) = mass/molar mass

= 90.0/122.944

= 0.732

n(C6H6) = mass/molar mass

= 89.0/78.108

= 1.1394

n(CH3COBr),n1 = 0.732 mol

n(C6H6),n2 = 1.1394 mol

Total number of mol = n1+n2

= 0.732 + 1.1394

= 1.8715 mol

Mole fraction of CH3COBr:

X(CH3COBr) = n1/total mol

= 0.732/1.8715

= 0.39

The mole fraction can be calculated by dividing the number of moles of one component of the solution by the sum of the number of moles of all components of the solution. Take care that the sum of the mole fractions of all components in the solution is 1. Calculate the mole fraction of solute by dividing the number of moles of solute by the total number of moles of substance present in the solution.

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Vapor pressure of solution is 23.189mm hg

The mole fraction or the molar fraction is defined as the unit of amount of the substances, divided by the total amount of all the substances that are present in the mixture. The formula for it is given below;

[tex]X_{A}[/tex] = [tex]N_{A}[/tex] ÷ [tex]N_{A}[/tex] + [tex]N_{B}[/tex]  (Where N represents the number of moles of A and B respectively)

Vapor pressure is defined as the pressure that is exerted by a vapor which is in equilibrium with its condensed phase at a given temperature in a closed system.

In the above given question we need to find out the vapor pressure of KCl where vapor pressure of water is given, so we use the following method to solve this question;

[tex]N_{A}[/tex] =    weight of water        = 250  = 13.88

         Molecular mass               18

[tex]N_{B}[/tex] = weight of KCl =    25       = 0.335

       Molecular mass     74.55

So, [tex]X_{A}[/tex] = 13.88          = 0.976           [[tex]P_{o}[/tex] = 23.76]

            13.88 + 0.335

We know that P = [tex]P_{o}[/tex][tex]X_{A}[/tex]

                       P = 23.76 × 0.976 ⇒ 23.189

Therefore the vapor pressure of the solution is 23.189mm

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According to Coulomb's Law two ions in an ionic chemical bond that forms large electrostatic potential then the two will attract each other

Coulomb law states that bond energy is inversely related to the bond length and so factor which influence bond strength influence its length this can allow us to determine some trends in bind length and ionic compound  are held together by coulombic attraction and there is a negatively charged ion next to a positively charged ion and two will attract each other and when positively charged ion form a bond with negatively charged ion one atom donate electron to the other and this is known as ionic bind and the chemical molecule sodium chloride is an example

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On the basis of electronegativity,  Na and K is most likely to form monatomic ions.

A monatomic ion is an ion that is made of more than one atom and is from an element like calcium consisting of Ca²+ and a polyatomic ion that is Co²/³.

Many elements such as hydrogen, lithium, sodium, potassium, and magnesium consist of positively charged ions.

Other like fluoride, chlorine, and iodine, and hydride consist of negatively charged ions.

Ba and Ca form diatomic ions.

Thus the correct option is Na and Cl which is sodium and potassium.

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In the periodic table, where atomic mass increases from left to right in period, therefore elements in increasing order of atomic mass will be element Y, element Z, element X.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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The magnesium ions require 0.04 moles of sodium ions while the calcium ions require 0.008 moles of the sodium ions.

We know that is the presence of the calcium and the magnesium in water that makes the water hard. These ions are divalent and are often removed by the use of an ion exchange resin. The ion exchange resin has the sodium ion at the surface which is easily exchanged for any of the hardness ions.

Given that;

2 moles of sodium reacts with 1 mole of magnesium

x moles of sodium reacts with 0.02 moles of magnesium

x = 0.04 moles of sodium ions

For calcium;

2 moles of sodium reacts with 1 mole of calcium

x moles of sodium reacts with 0.004 moles of calcium

x = 0.008 moles of sodium

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Aqueous Solution - The expected precipitate would consist of Cu(OH)2.

What is aqueous solution?

An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na+(aq) + Cl would be used to represent a solution of table salt, as well as sodium chloride (NaCl), throughout water (aq). The word aqueous, which derives from the word aqua, means that it is dissolved in or related to water. Water is a common solvent in chemistry due to its superior solvent properties and natural abundance. Since water is frequently used as a solvent in experiments, unless the solvent is specified, the word "solution" refers to an aqueous solution. A solution wherein the solvent is a liquid but not water is referred to as a non-aqueous solution.

Because:

salt:    copper(II) hydroxide
Ksp:    1.8 × 10-19

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The VSEPR theory is used to predict the three dimensional structure of molecules.

What is VSEPR theory?

Chemistry uses the valence shell electron pair repulsion (VSEPR) theory as a model to forecast how each individual molecule would look based on how many electron pairs will be surrounding its center atom. The two principal creators of the theory, Ronald Gillespie and Ronald Nyholm, gave it the additional moniker Gillespie-Nyholm theory.

Therefore, the VSEPR theory is used to predict the three dimensional structure of molecules.

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The partial pressure of Xe will be 1.85 atm.

How to find the partial pressure?

The total pressure is equal to the sum of the partial pressures. The total pressure is equal to the sum of the partial pressures.

Subtract the sum of the known partial pressures of the other components from the overall pressure to determine the partial pressure of one component in a mixture.

Given values: P_{He} = 0.250 atm, P_{Ar} = 0.400 atm, P_{total} = 2.50 atm

To Find: P_{Xe} = ?

Solution: Calculate the total pressure, then deduct the sum from the partial pressures of helium and argon.

P_{He} + P_{Ar} = 0.250 atm + 0.400 atm = 0.650 atm

P_{Xe} = P_{total} - (P_{He} + P_{Ar}) = 2.50 atm - 0.650 atm

P_{Xe} = 1.85 atm

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Lower flammable limit means the lowest concentration of a material that will propagate a flame.

What is hazardous atmosphere?

It is an atmosphere that may expose employees to risk of death, incapacitation, impairment of ability to self-rescue, injury, or acute illness from one or more of following causes

What is lower flammable limit?

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Answer:

The link reaction links Hint to the Krebs Cycle. It converts pyruvic acid to Acetyl-CoA. Carbon dioxide is released as a waste product, and one Hint is produced.

Explanation:

A carbon atom is taken out of pyruvate during the link reaction, creating carbon dioxide. Pyruvate is converted into acetate along with the removal of hydrogen, which is then taken up by the coenzyme NAD to create reduced NAD.

The conjugate base of pyruvic acid is pyruvate. It serves as a crucial intermediary in a number of biological processes. It is created at the conclusion of glycolysis and serves as a catalyst for a number of metabolic processes, including gluconeogenesis, fermentation, cellular respiration, fatty acid synthesis, etc.

During cellular respiration, glucose and oxygen combine to produce carbon dioxide, water, and energy. Animals breathe out most of their carbon dioxide, which is then discharged into the atmosphere. Plants can then use this carbon dioxide for photosynthesis.

Acetyl-coenzyme A, the link reaction's final byproduct, then moves into the Krebs Cycle. Through the oxidation of acetyl-coenzyme A, the Krebs Cycle generates energy.

Thus, pyruvate is changed into the two-carbon molecule known as acetate.

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Answer:

Explanation:

Aliphatic compounds are those hydrocarbons that are the open chain compounds and also closed chains. Aromatic compounds are those who have only a closed chain structure. They can be saturated as well as unsaturated where the system can be open as well as closed chain.

All halogen elements exist as diatomic molecules: F2, Cl2, etc. The intermolecular attractions between one molecule and its neighbors are van der Waals dispersion forces these forces cause an increase in boiling points down the group.

The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.

B.P (°C)  F   <    Cl   <  Br   <  I    <    At

            -188     - 35    58     184       337

The boiling points of F2, Cl2, Br2, and I2 are determined by the magnitude of the intermolecular dispersion forces. The larger the atom, the higher the polarizability of the electron cloud and the greater the dispersion force. Hydrogen bonding between water molecules. The presence of hydrogen bonds greatly increases the boiling point of a substance. A plot of the hydride boiling points for group 4 shows a steady increase as you go down the group from CH4 to SnH4.

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Answer:

Carbon dioxide (CO2) dissolves in the ocean and reacts with water to form carbonic acid—which in turn generates bicarbonate, carbonate, and hydrogen ions. Calcium and carbonate ions combine to form the solid calcium carbonate crystals in their shells and skeletons.

When polonium-210 emits an alpha particle, the child isotope has an atomic mass of 206.

I-131 undergoes beta-minus decay. The chemical symbol for the new element is ¹³¹₅₄Xe

Fluorine-18 undergoes beta-plus decay. The child isotope has an atomic mass of 18.

Isotopes are atoms of the same element that have the same atomic mass number but different masses as a result of the difference in the number of neutrons in the element.

When polonium-210 emits an alpha particle, the equation is given below:

²¹⁰₈₄Po ---> ²⁰⁶₈₂Pb + ⁴₂He

When I-131 undergoes beta-minus decay, the equation is given below:

¹³¹₅₃I ---> ¹³¹₅₄Xe + ⁰₋₁β

When fluorine-18 undergoes beta-plus decay, the equation is given below:

¹⁸₉F ---> ¹⁸₈O + ⁰₁β

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The compound is likely to conduct electricity when in an aqueous solution of calcium chloride. Option 3.

Sodium chloride in its aqueous state can conduct electricity due to the presence of free ions, whereas urea glucose and sucrose, which are not electrolytes, do not conduct electricity. An aqueous solution is a water that contains one or more solutes.

Solutes in aqueous solutions can be solids gases or other liquids. A mixture must be stable to be a true solution. Aqueous in a chemical formula indicates that the substance is dispersed in water. For example, if you pour caustic soda into dilute hydrochloric acid, you get an aqueous solution of sodium chloride. The liquid is used to indicate the formation of liquid substances in reactions.

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a) The rate of reaction can be measured from the mass of the marble chips that disappear.

b)

i) The rate of reaction would decrease

ii) The rate of reaction would increase

iii) The rate of reaction would decrease

The term rate of reaction has to do with the speed with which reactants are converted into products. We know also that we can be able to define the rate of reaction as the rate at which the products do appear in a reaction. From our two definitions of the rate of reaction, we can see that we could look at the idea of the rate of reaction from two perspectives which are;

1) Change in the amount of recaatnts

2) Change in the amount of products

The both approaches can be measured by the use of different methods that can be used in the study of chemical reactions.

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Answer:

Fossil fuel C

Material resource A

Natural resource B

Hope this helps

Explanation:

Answer:

Fossil fuel-----a nonrenewable resource formed by buried remains of plants and animals

Material resource-----any natural material used by people

Natural resource-----resource used to make objects, food, or drink

Explanation:

Fossil fuels are widely known as a nonrenewable source of energy that can be found by garnering the buried remains of plants and animals deep in the ground.

Material resources are natural resources we extract from the earth that have value and practical use for humans.

Natural resources are resources we extract from nature and use in order to survive. Natural resources are things such as water, food, and trees (aka material for shelter.)

To find the correct number significant digits, learn the concentration and initial rate.

What is concentration?

In chemistry and related fields, the idea of concentration is used frequently. It is a way to gauge how much of one substance is incorporated into another.

What is initial rate?

When a reaction first begins, or when t = 0, its initial rate is the rate that exists at that precise moment. At time zero (t), the slope of the reactant concentration versus the time curve is equal to the initial rate.

Rak=k(H₂) (NH₃) Rak law expression

1. reaction order w.r.t H₂ is ⇒2

2. reaction order w.r.t  NH₃ is⇒ 1.

3. overall order 2+1=3 ( bird order reaction)

4. k(H₂) (NH₃)= 0.740⇒ 1

H₂ is doubled ⇒ r₂=k(H₂) (NH₃)=4k(H₂) (NH₃)⇒2

(2)/(1) = r₂/r₁ = 4k(H₂) (NH₃)/k(H₂) (NH₃)=4

r₂= 4∝ r₁ = 4∝ 0.740=2.96m/s

5. r= 6.0∝ 10^⁴m/s, (H₂)= 0.98m, (NH₃)= 0.31m

r=k(H₂) (NH₃)

k=r/(H₂) (NH₃)= 6.0 ∝ 10^⁴/(0.98)^²(0.31)=201528.93m^⁻²s^⁻¹

K=2.0 ∝ 10^5m^⁻²s^⁻¹

Therefore, the significant digit is K=2.0 ∝ 10^5m^⁻²s^⁻¹

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The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei.

Electronegativity is defined as the ability of an atom within a molecule to attract electrons to itself. The concept of an elemental electronegativity scale was proposed by Pauling.

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When two oxygen atoms bond together in O2, they form a non-polar covalent bond.

What are covalent bonds?

A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are mentioned as shared pairs or bonding pairs. once they share electrons, the stable balance of attractive and repulsive forces between atoms is known as a covalent bond When two oxygen atoms are bonded as O2, they form a non-polar covalent bond. When two non-metal atoms sharing of electrons, a covalent bond is created. The involved electrons are located in the atoms' outer shells. An atom's outer shell will be completed if it shares one or both of its electrons. Covalent bonds require a lot of energy to break because they are so strong.

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Compounds were being removed when the recovered copper product was washed repeatedly with water is aluminum III and copper II sulphate being removed

Compound is a substance made from two or more different elements that have been chemically joined and when the recovered copper product was washed repeatedly with water and the compound removed during those washes were aluminum III and copper II sulphate and the ethanol is to remove the water clinging to the solid and the ethanol evaporated faster and end up with dry solid faster and dispense with the ethanol wash but wait longer to dry the product and used other solvent such as acetone or heat the product

A steam bath is used instead of a hot plate to dry recovered copper to prevent overheating and overheating can lead to atmosphere oxygen oxidizing the copper and causing impurities

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Answer:

below

Explanation:

First it warms up until it reaches the boiling point temperature ....add more energy and it will begin to boil ...continue adding energy and it will begin to vaporize into steam

Answer:

It evaporates the liquid water.

Explanation:

This energy exists in the form of heat. Evaporation happens when a liquid is heated. For example, as the sun heats water in a puddle, the puddle slowly shrinks. The water seems to disappear, but it moves into the air as a gas called water vapor.