Based on the information in the table above, which of the following is the best hypothesis regarding the properties of the compounds that can form from the given ions?


A. Mgcl₂ has the highest solubility in water.

B. MgO forms the strongest ion-dipole interactions in aqueous solution.

C. RbCl₂ has the largest lattice energy of the possible compounds.

D. Rb₂O is the most stable of the

Answer:

1. Zinc

2. Calcium

3. Francium

4. Phosphorus

5. Neon

Explanation:

Add the no. of electrons in each orbital. The sum is the atomic number of the element

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.25moles  of He are in a container with a volume of 5.6 L at STP.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

One mole of ideal gas has 22.4L volume at STP.

number of moles of Helium = Given volume ÷volume occupied by gas at STP

Given volume of helium = 5.6 L

Substituting all the given values, we get

number of moles of Helium = 5.6 L  ÷22.4L

number of moles of Helium =0.25moles

Therefore, 0.25moles  of He are in a container with a volume of 5.6 L at STP.

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Answer: 0.25 moles

Explanation:

Given volume of helium = 5.6 L

Substituting all the given values, we get

number of moles of Helium = 5.6 L  ÷22.4L

number of moles of Helium =0.25moles

Therefore, 0.25moles  of He are in a container with a volume of 5.6 L at STP.

The characteristics of a good recrystallization solvent are;

We know that recrystallization is the process by which we can be able to remove impurities from a solute. We can obtain the solute as the product of a given reaction.

We know that there are certain properties of the solvent that would make the solvent to be sufficient as a tool for the process of recrystallization to obtain the desired results.

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The act of repeatedly carrying out a task is known as repetition. Replication is the capacity of a procedure to be replicated by another person in the exact same way.

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The reaction used to prepare iodine in the laboratory is

2LiI(s)+2H₂SO₄(aq)+MnO₂(s)→Li₂SO₄(aq)+MnSO₄(aq)+I₂(aq)+2H₂O(l)

The oxidation state of Li in LiI is +1 and of I in LiI is -1.

The oxidation state of the element is defined as the number of electrons gained or lost by an element in the compound. Since Li is present in the 1st group of the periodic table and it contains one valence electron in it. It loses one electron to form Li⁺ ion. Hence, the oxidation state of Li in LiI is +1.

Iodine(I) element is present in the 17th group of the periodic table. It contains seven valence electrons in it and it requires one electron to complete its octet. When it gains one electron, it forms I⁻ ion. Hence, the oxidation state of I in LiI is -1

Therefore, the oxidation state of Li in LiI is +1 and of I in LiI is -1.

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Pour water into a graduated cylinder, measure the volume, submerge the object, and measure the volume again. The metal cylinder has a density of 0.1167.

These cylinders are used to test density and specific gravity. Smooth surfaces and meticulously turned ends. a collection of six various pieces in cylinder shape for density in electrical and thermal studies.

Weighing a metal object twice, once in air and once submerged in a liquid, yields the density of the metal, as described in the section The science behind density measurements.

An item of laboratory equipment known as a measuring cylinder, graduated cylinder, cylinder measurement, or mixing cylinder is used to measure the amount of liquids, chemicals, or solutions during routine lab work.

The object's volume can be calculated as the difference between the two volume measurements. The density of the object can now be determined by simply dividing the mass by the volume.

79.95 - 70.00 = 9.95

=9.95 ÷ 85.20

=0.1167

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According to the concept of chemical reaction, on addition potassium chromate to barium chloride precipitate is formed which is dissolved on addition of HCl,when this mixture is cooled at room temperature the forward reaction is endothermic.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

The bond-dissociation energy is one measure of the strength of a chemical bond A−B. It can be defined as the standard enthalpy change when A−B is cleaved by homolysis to give fragments A and B, which are usually radical species

The order of the components of the electromagnetic spectrum from shortest wavelength to longest is as follows: 3-5-2-1-7-6-4.

Electromagnetic spectrum is the entire range of wavelengths of all known electromagnetic radiations extending from gamma rays, to X-rays through visible light, infrared, to radio waves.

The components of the electromagnetic spectrum from order of shortest to longest wavelength is as follows;

This suggests that gamma rays have the shortest wavelength while radio waves have the longest wavelength.

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Answer:

12.044×10^23

Explanation:

Molecular mass is the sum of atomic masses of the elements present in a molecule. 12 gram of carbon that is one mole contains

6.022×10^23 atoms

. It is called Avogadro's constant.

So, Number of particles = Given number of moles

×

Avogadro number.

Therefore, the number of atoms of He in 2.0 moles = 2.0× 6.022×10^23= 12.044×10^23

There are

12.044×10^23

atoms in 2.0 moles of Helium.

Calcium chloride, CaCl2, is a white, crystalline salt that is very soluble in water.

Calcium chloride is an inorganic compound, a salt with the chemical method CaCl 2. it is a white crystalline strong at room temperature, and it's miles exceptionally soluble in water.

Solubility is defined as the maximum amount of a substance in an effort to dissolve in a given quantity of solvent at a special temperature. Solubility is a characteristic asset of a particular solute-solvent combination, and special substances have significantly differing solubilities.

Solubility refers to the finest quantity of solute that may dissolve in a recognized quantity of solvent at a given temperature. In a solvent, an answer is a homogeneous mixture of one or more solutes. A not unusual instance of an answer is sugar cubes brought to a cup of tea or coffee.

Dissolution is the process where a solute in a gaseous, liquid or stable section dissolves in a solvent to shape an answer. Solubility is the maximum awareness of a solute that may dissolve in a solvent at a given temperature. at the most attention of solute, the solution is said to be saturated.

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The heat released by 100g of the compound is  2.8 x10^3 kJ .

We know that the process of combustion is the process that enables a substance to be burnt in air. Heat and light can be produced in the process of the combustion.

Number of moles of the Methylhydrazine =  mass/ molar mas = 100.0g/46 g/mol = 2.17 moles

If from the balanced reaction equation;

1 moles of Methylhydrazine produces 1.30x10^3 kJ

Then 2.17 moles of Methylhydrazine produces  2.17 moles *  1.30x10^3 kJ/1 mole

= 2.8 x10^3 kJ of heat.

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Acid base reaction. H2S - acid and NaHCO3 - base

Answer:

b. i)

[tex]MgSO_{4} + 2NaOH ---- > Mg(OH)_{2} + Na_{2}SO_{4}[/tex]

try balancing Sodium first. There's 2 Sodium on the product side. So multiply 2 with NaOH, then you'll see the that there are equal no. of Na and OH on both sides so the equation is balanced

ii) Using the solubility table, we see that when OH- bonds with a metal, in most cases it would produce insoluble product i.e. precipitate. So Mg(OH)2 will form precipitate.

iii. it's a redox reaction. It can also be called a substitution reaction & precipitation reaction.

iv. (SO4)2- produces aqueous solution. NaOH is soluble in water unlike the group 2 metal hydroxides. So the reaction would be

[tex]MgSO_{4}(aq) + 2NaOH(aq) ---- > Mg(OH)_{2}(s) + Na_{2}SO_{4}(aq)[/tex]

c. Iron(II) chloride = Fe(Cl)2

Sodium Carbonate = NaHCO3

Reaction:

[tex]FeCl_{2} + Na_{2}CO_{3} ---- > FeCO_{3} +2 NaCl[/tex]

The balanced chemical reaction equation is; [tex]MgSO_{4} (aq) + 2NaOH (aq) ----- > Mg(OH)_{2} (s) + Na_{2} SO_{4} (aq)[/tex]. This is a double replacement reaction and the magnesium hydroxide is insoluble in water.

We know that sometimes, when we mix two reactants that are in the aqueous state, we do get a product that is in the solid state. This implis that the intrecation between the reactants has given rise to an insoluble product. An insoluble product is a product that would not dissolve in the reaction system.

We know that the hydroxides of the alkaline earth metals are insoluble in water according to the solubility rules. Recall that the solubility rules tells us the kind of interactions that could lead to an insoluble product.

This reaction is an example of a double replacement reaction and the equation of the reaction can be shown as; [tex]MgSO_{4} (aq) + 2NaOH (aq) ----- > Mg(OH)_{2} (s) + Na_{2} SO_{4} (aq)[/tex]

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When sucrose is hydrolyzed, fructose and glucose will be created as the glycosidic linkage is broken. Hydrolyzed sucrose will give a positive Benedict's test. Hydrolysis can be achieved by adding dilute sulfuric acid.

Sucrose is a disaccharide sugar composed of glucose and fructose monomer units linked together by glycosidic bonds.

Because there are no free aldehyde groups, a sucrose molecule is not reducing.

Hydrolysis of sucrose yields fructose and glucose.

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Answer:

True (the statement is correct)

Explanation:

Yeah, resilience describes an ecosystem's ability to maintain dynamic equilibrium.

Resilience is the capacity to cure from difficulties. Hence, the statement is true.

The compound from the list that will not be a strong electrolyte would be HF.

Electrolytes are chemical substances that conduct electricity in molten or aqueous forms.

Substances that conduct electricity in molten or aqueous forms can be grouped into two categories, namely:

Strong electrolytes completely dissociate into their respective component ions in molten or aqueous forms.  For example, HCl completely dissociates in aqueous forms as follows:

[tex]HCl (aq) --- > H^+ (aq) + Cl^- (aq)[/tex]

On the other hand, weak electrolytes only partially ionize into their component ions in molten or aqueous forms. For example, HF will ionize in water only to a small extent because it is a weak acid. Only a few ions are present in the aqueous molten forms.

Thus, considering all the compounds given in the option, the one that would not be a strong electrolyte is HF.

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The volume of 0.100M NaCl that would be required to make a 0.0350M solution of NaCl when diluted to 150.0mL with water is 52.5mL.

The volume of a diluted solution can be calculated using the following formula;

CaVa = CbVb

Where;

According to this question, 0.100M NaCl would be required to make a 0.0350M solution of NaCl when diluted to 150.0mL with water. The volume can be calculated as follows:

0.1 × Va = 0.0350 × 150

0.1Va = 5.25

Va = 52.5mL

Therefore, 52.5mL is the volume required to dilute the sodium chloride solution.

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By tying to the minerals in the water, washing soda "softens" the water so that detergents can more easily remove dirt from fabric. Coffee and tea stains on ceramics as well as grease from pots and pans can be eliminated with washing soda.

chemical reaction

Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O

Decomposition reaction involved in washing soda. Heat causes carbon dioxide and sodium oxide to decompose.

Solvay's method is used to create washing soda. Sodium chloride, ammonia, and carbon dioxide react in water as part of Solvay's process. Calcium oxide is used to recover ammonia from ammonium chloride while calcium carbonate is used to produce carbon dioxide.

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The volume of the given gas is 5.35 L.

Here we use the combined gas law viz. P1V1/T1 = P2V2/T2, which is  derived from the ideal gas equation PV = nRT, where

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature.

Here,

[tex]$P_1[/tex] = 1.40 atm, [tex]$P_ 2[/tex]= 0.989 atm  

[tex]$V_1[/tex] = 3.70 L, [tex]$V_2[/tex] = ?

[tex]$T_1[/tex] = 12.20°C = (12.20 + 273) K = 285.2 K  

[tex]$T_2[/tex] = 20.80°C = (20.80 + 273) K = 293.8  K

substituting the values in the equation  P1V1/T1 = P2V2/T2, we get,

(1.40 x 3.70)/285.2 = 0.989 x [tex]$V_2[/tex]/293.8

[tex]$V_2[/tex] = (1.40 x 3.70 x 293.8) / (285.2 x 0.989)

[tex]$V_2[/tex] = 1521.884 / 284.211

[tex]$V_2[/tex] =5.35 L

Thus, the volume of the gas is 5.35 L.

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Answer:

[tex]\huge\boxed{\sf Option\ D.}[/tex]

Explanation:

[tex]\rule[225]{225}{2}[/tex]

The disaccharide formed by joining two monomers of D-glucose is β-D-glucopyranosyl-(1→4)-β-D-glucopyranose. Therefore, option (A) is correct.

Glucose can be described as a monosaccharide containing six carbon atoms and an aldehyde group. Glucose can exist in an open-chain as well as ring (cyclic) form.

Glucose can be described as a sugar with the molecular formula C₆H₁₂O₆. Glucose is the most abundant monosaccharide which is a category of carbohydrates. Glucose is generally made by plants and algae during photosynthesis from water and CO₂ using energy from sunlight which is used to make cellulose in cell walls.

Glucose in energy metabolism is the most important source of energy in all organisms. Glucose for metabolism can be stored as a polymer, in plants as starch and amylopectin, and in animals as glycogen.

The naturally occurring glucose exists as D-glucose, while L-glucose is produced synthetically.  

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The frictional force that acts on the body is shown as force D.

We know that the term friction has to do with the force that opposes the motion of a body along a surface. The magnitude of the frictional force is highly dependent on the nature of the surfaces that are in contact with each other.

In this case we have a free body diagram. The meaning of the Freebody diagram is a diagram that show all the forces that acts on a body. In this case, we can see that there are four forces that act on the body and they are the frictionl force, the moving force, the weight of the object and the normal reaction on the objject.

We can see that all the forces that are acting on the body have been labelled with a proper alphabet.

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Based on the concentration and pH of monoprotic acid, the Ka for the acid is 4.04 * 10⁻⁶.

Acids are defined as a substance that when dissolved in water produces hydrogen ions as the only positive ions in the solution.

The number of hydrogen ions that an acid produces per molecule of the solution is known as the basicity of the acid.

When an acid produces one mole of hydrogen ions per molecule of acid, the acid is said to be monobasic or monoprotic.

When an acid produces two moles of hydrogen ions per molecule of acid, the acid is said to be dibasic or diprotic.

The given acid is said to be monoprotic.

Let the monoprotic acid be HA.

The dissociation of HA in the solution is given as follows:

HA ⇄ H⁺ + A⁻

Ka = [H⁺] * [A⁻] / [HA]

[H⁺] = [A⁻]

The pH of the acid solution is 2.69

Hence

[tex][H^{+}] = 10^{-pH}[/tex]

[tex][H^{+}] = 10^{-2.69}[/tex]

[H⁺] = 0.00204

[A⁻] = 0.00204

[HA] = 1.03 M

Hence, Ka will be:

Ka = (0.00204 * 0.00204) / 1.03

Ka = 4.04 * 10⁻⁶

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Molarity (M) is the amount of a substance in a sure quantity of solution. Molarity is described because the moles of a solute according to liters of an answer. Molarity is also called the molar attention of an answer.

Calculation:-

mass = 0.600 g

the molar mass of NaNO₃ = 85 g

moles = 0.600/85

           = 0.007 moles

volume = 2 L

molarity = moles/volume

            = 0.007 /2

            = 0.035 M

Molar concentration is a measure of the attention of a chemical species, specifically of a solute in an answer, in terms of the amount of substance in step with the unit extent of the answer. In chemistry, the most generally used unit for molarity is the number of moles in keeping with liter, having the unit symbol mol/L or mol/dm³ in SI unit.

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The statement that Jacinta can correctly make about the chemical properties of non-metals is:

Non-metals react only with other non-metals. ​; option D.

Elements are substances that cannot be split into simpler substances by an ordinary chemical process. Hence, elements are the basic building blocks of all matter.

Elements are classified into three types:

Metals are shiny hard substances that are able to conduct heat and electricity.

Metalloids have a mix of the properties of metal and non-metals. For example, metalloids are not shiny but they are able to conduct electricity.

Non-metals are elements that are usually soft and which do not conduct heat and electricity. Non-metals usually exist in the form of gases. Examples of non-metals are the elements present in the substances that are involved in breathing, that is, oxygen gas, water vapor, and carbon dioxide. The elements are oxygen, hydrogen, and carbon.

These elements react with each other chemically to form compounds.

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Complete question:

Jacinta is learning about the chemicals involved in breathing. Oxygen gas, water vapor, and carbon dioxide are all compounds formed by chemical reactions between nonmetal elements. Which statement can Jacinta correctly make about the chemical properties of nonmetals?

A. Many nonmetals react with both metals and nonmetals.

B. Nonmetals are poor conductors of heat and electricity.

C. Many nonmetals are gases at room temperature.

D. Nonmetals react only with other nonmetals. ​

The order of the reaction is zero and the rate constant is 1.67.

From the information given, the rate law expression is illustrated thus:

Rate = k.[A]x

Time (sec) Concentration (mM)

    0                           200

   60                    100

  105                    B25

After 60 sec,

Rate = -d[A]/dt

= -[100 - 200]/(60 - 0)

= 100/60 = 1.67

After 105 sec,

Rate = -d[A]/dt

= -[25 - 100]/(105 - 60)

= 75/45 = 1.67

As we can see, the rate is constant. This is constant with respect to change in the concentration of A.

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Consider the following mechanism.

The overall balanced chemical equation : 2O₃  ---->   3O₂

The intermediates within the mechanism : O

The order with respect to each reactant :  2

The rate law for the overall reaction : R = k[O₃]²/[O]

The equations are :

O₃  ---->   O₂  +  O   fast

O₃  +   O  --->  2O₃   slow

a) The overall reaction is given as :

2O₃  ---->   3O₂

b) The intermediates within the mechanism is O.

c)  The order with respect to each reactant is 2

d) slow step rate : k[O][O₃]

at equilibrium, kc = [O][O₂] / [O₃]

The rate law = R = k[O₃]²/[O]

Thus, Consider the following mechanism.

The overall balanced chemical equation : 2O₃  ---->   3O₂

The intermediates within the mechanism : O

The order with respect to each reactant :  2

The rate law expression for the reaction : R = k[O₃]²/[O]

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The charge +2 on the ions of Mg and Ba.

The charge of +1 on the ions of Li and K.

The charge -1 on the ions of Br and I.

The charge -2 on the ions of O and S.

An ion can be described as a chemical specie that holds a positive charge or negative charge. The term ‘ion’ is usually referred to atoms or molecules with non-zero net charges on them. Therefore, all ions contain either a greater number of electrons than protons or a greater number of protons than electrons.

If the number of protons in an atom is greater than electrons then the ion will hold a net positive charge and is referred to as a cation. The ions that contain greater electrons than protons then they will hold a net negative charge and are called anions.

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