What is the predicted change in the boiling point of water when 1.50 g of
barium chloride (BaCl₂) is dissolved in 1.50 kg of water?
Kb of water = 0.51°C/mol
molar mass BaCl₂ = 208.23 g/mol
ivalue of BaCl₂ = 3

The intermolecular forces that exist between Br₂ and CCI₄ is dispersion force and London dispersion force

Intermolecular forces that arises between the positive components of one molecule and the negative components of another molecule and in the Br₂ there is London dispersion force because this is the diatomic element are nonpolar and nonpolar molecules are only capable temporary dipoles and the intermolecular forces between CCI₄ is the London dispersion force of attraction which is also known as induced dipole induced dipole and it is referred to as induced dipole because it is an attraction between temporary dipole in the structure

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Answer:

cup...................

The systematic name of the compound is 2,2,3,3-tetramethylbutane.

The parent chain in this compound consists of four carbon atoms, indicated by the central chain of Cs in the diagram you provided. The prefix "but" in the name indicates that there are four carbon atoms in the parent chain.

The four methyl groups are attached to different carbon atoms in the parent chain. We can indicate the position of each methyl group by numbering the carbons in the parent chain. In this case, we can number the carbons starting from the left side of the parent chain, so that the first methyl group is attached to the second carbon, the second methyl group is attached to the third carbon, the third methyl group is attached to the second-to-last carbon, and the fourth methyl group is attached to the last carbon. This gives us the substituent groups 2,2,3,3-tetramethyl-.

Finally, we combine the parent chain name and the substituent groups to get the full name: 2,2,3,3-tetramethylbutane.

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The net ionic equation can be given as Sn²⁺ (aq) + S²⁻ (aq) → SnS (s).

The atoms or molecules on losing or gaining electrons in order to achieve the stable configuration results in the formation of positive or negative charge and are termed as ions.

The ionic equation can be given with the formation of the respective ions of the reactant and the product side.

SnSO₄ (aq) → Sn²⁺ (aq) + SO₄²⁻ (aq)

Na₂S (aq) → 2 Na⁺ (aq)  + S²⁻ (aq)

SnS (s) → did not dissociates as form a solid covalent compound

Na₂SO₄ (aq) → 2 Na⁺ (aq)  + SO₄²⁻ (aq)

The complete ionic equation can be given as:

Sn²⁺ (aq) + SO₄²⁻ (aq) + 2 Na⁺ (aq)  + S²⁻ (aq) → SnS (s)  2 Na⁺ (aq)  + SO₄²⁻ (aq)

Eliminating the common ions on the product and the reactant side:

Sn²⁺ (aq) + S²⁻ (aq) → SnS (s)

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The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.

What is chemical formula and how they are formed ?

A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.

Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.

The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.

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Answer:

Explanation:

To determine the mass of NaCl in 1.25L of 0.1035M solution, we can use the formula:

mass = concentration x volume x molar mass

where concentration is in molarity (M), volume is in liters (L), and molar mass is in grams per mole (g/mol).

The molar mass of NaCl is 58.44 g/mol.

Plugging in the given values, we get:

mass = (0.1035 M) x (1.25 L) x (58.44 g/mol)

mass = 7.3188 g

So, there is approximately 7.3188 grams of NaCl in 1.25L of 0.1035M solution.

Answer:

see below

Explanation:

A. The given reaction releases energy, indicating that it is an exothermic reaction.

B. The △H value for the reaction can be written as △H = -571.7 kJ, with a negative sign indicating the energy is released.

C. The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2(g) + O2(g) → 2H2O(l)

D. To calculate the amount of energy released when 10.0g of hydrogen is reacted with an excess of oxygen, we need to first determine the amount of hydrogen involved in the reaction.

The molar mass of hydrogen is 1.008 g/mol, so 10.0 g of hydrogen is equivalent to 10.0 g / 1.008 g/mol = 9.92 mol of hydrogen.

From the balanced equation, we can see that 2 mol of hydrogen is required for every 1 mol of oxygen, so the amount of oxygen involved in the reaction is twice the amount of hydrogen.

Therefore, the amount of oxygen needed for 9.92 mol of hydrogen is 2 × 9.92 mol = 19.84 mol.

Assuming that there is an excess of oxygen, all of the hydrogen will react, so the limiting reactant is oxygen.

Using the △H value of -571.7 kJ, we can calculate the amount of energy released as follows:

-571.7 kJ / 2 mol H2 = -285.9 kJ/mol H2

So the energy released when 10.0 g of hydrogen reacts with an excess of oxygen is:

-285.9 kJ/mol H2 × 9.92 mol H2 = -2836.53 kJ

Therefore, the reaction releases 2836.53 kJ of energy when 10.0 g of hydrogen reacts with an excess of oxygen.

Answer: they are Positively charged

Answer:

Difference between reversible changes and irreversible changes. A substance can return to its original state. ... Most physical changes are reversible changes. All chemical changes are irreversible changes.

Explanation:

i hope i helped answer your question

:D

Answer:

Difference between reversible changes and irreversible changes. A substance can return to its original state. ... Most physical changes are reversible changes. All chemical changes are irreversible changes.

PLS mark me brainllest

The following balanced chemical equation may be used to describe the interaction between aluminum (Al) and calcium nitrate (Ca(NO₃)₂):

2 Al + 3 Ca(NO₃)₂ → 2 Al(NO₃)3 + 3 Ca

Reactants are the chemicals that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

The substances that initiate a chemical reaction. Products are the substances that are created during the reaction. Compounds or elements can act as reactants and products.

Aluminium and calcium nitrate interact in this reaction to form aluminium nitrate (Al(NO₃)₃) and calcium (Ca), which are the end products.

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Answer: Pentane C5H12

Explanation:

The boiling point of a substance is simply defined as the temperature whereby a liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid will changes into vapor.

The likely molecular formula for this compound is Pentane i.e C5H12 due to the fact that its boiling point is between Butane with formula C4H10 and Hexane with formula C6H14 boiling points.

The molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

Boiling point:

It is the temperature at which liquid's vapor pressure is equal to the pressure that is surrounding the liquid and hence, the liquid start to into vaporize.

The boiling point of the given compound is 309 K which is between Butane  and Hexane.

Therefore, the molecular formula of the of the substance is \(\bold {C_5H_1_0}\) (pentane).

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It is a kind of radiation including visible light ,radio waves, gamma rays, and x-rays in witch electric and magnetic fields vary simultaneously. Hope that helps :)

Answer:

we don't understand why humans have only 46 chromosomes

Answer:

46 chromosomes is what we don't understand

The mass of water produced when 6.26g of butane reacts with excess of oxygen will be 9.78g.

According to given question, the reaction would be:

C₄H₁₀ + 13/2O₂ --- 4CO₂ + 5H₂O

6.26g 0 0

As we know,

(mole of C₄H₁₀)÷coefficient = (mole of H₂O)÷coefficient

6.26/molecular weight ÷ 1 = mass of H₂O/molecular weight ÷ 5

6.26÷58 = Mass of H₂O/18×5

Mass of H₂O = 9.78g

Therefore, the mass of water produced when 6.26gram of butane reacts in the presence of excess of oxygen will be 9.78gram.

The combustion of butane is a reaction between butane and oxygen gas that leads to the production of carbon dioxide gas and water. This hydrocarbon combustion reaction releases heat energy and is an example of an exothermic reaction.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

Here are six materials that are good insulators to keep ice from melting for at least twenty minutes:

Styrofoam: This material is often used to make insulated coolers because of its low thermal conductivity, which makes it an excellent insulator.

Fiberglass: This material is often used in insulation for walls and attics because it traps air and reduces heat transfer.

Polyurethane foam: This material is used to insulate refrigerators and freezers because of its excellent thermal insulation properties.

Cellulose insulation: This is a type of insulation made from recycled materials that provides good thermal insulation.

Mineral wool: This is a type of insulation made from natural rock materials that provides good thermal insulation and fire resistance.

Aerogel: This is a highly effective insulator made from a gel-like substance that has been dried to create a material that is more than 95% air. It is often used in scientific applications where extreme temperature control is required.

Matter of the substance is the mass and takes up space, volume . .The physical properties of matter is the that determine without changing chemical identity.

The  properties of matter is of two types : the physical property and the chemical property . A physical properties of matter is the property that can be determined without changing their chemical identity of a substance. example : density , color, mass , volume , length,  etc. the physical properties are of two types : intensive physical properties and the extensive physical properties.

The chemical properties of that that can be determine by the changing the chemical identity of substance. example : toxicity, heat, enthalpy, flammability.

Thus, Matter of the substance is the mass and takes up space, volume .The physical properties of matter is the that determine without changing chemical identity.

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This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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The concentration in weight percent is 40%

The following data were obtained from the question:

Concentration in weight percent = (mass of sugar / total mass) × 100

Concentration in weight percent = (6.000 / 15.000) × 100

Concentration in weight percent = 0.4 × 100

Concentration in weight percent = 40%

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Answer:

beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Alkaline earth metals are those that have two valence electrons in their outermost shell.

Barium (Ba), Radium (Ra), Strontium (Sr), Magnesium (Mg), Calcium (Ca), and Beryllium (Be) are the six alkaline earth metals.

By donating their outermost electrons, they take on the noble gas electron configuration, which increases their stability. When electrons are transferred to an atom with an electronegative charge, the alkaline earth metals get a positive charge.

The second column of the periodic table contains alkaline earth metals, which are very reactive metals. These metals are the building blocks of the entire world. These metals are typically found as sulfates in nature.

A few examples of minerals are gypsum, calcium sulfate, epsomite, magnesium sulfate, barite, and barium sulfate.

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The boiling point of water is 100.0 °C, the boiling point of the solution will be : 101.49 °C.The correct answer is option (a) 100.00049 °C.

Ideal Solution : An ideal solution is a homogeneous mixture of two or more components that obeys Raoult's law, which states that each component's vapor pressure is proportional to its mole fraction.The boiling point of a solution depends on the solvent's properties and the solute's concentration. It's dependent on the mole fraction of the solvent and solute, as well as the total concentration of the solution. The change in boiling point of a solution is given byΔTb = Kb × m × i, whereKb = ebullioscopic constant, m molarity of the solution, and i = van't Hoff factor.Assuming that the solution's behavior is ideal, we may use the molality of the solution to compute the boiling point elevation of the solution.The molality of the solution is given by the following formula:m = (n₂ / m₂) ÷ (n₁ / m₁), where n is the number of moles, m is the mass, and the subscripts 1 and 2 refer to water and non-volatile solute sucrose, respectively.The molar mass of sucrose (C₁₂H₂₂O₁₁) is342.3 g/mol; therefore, the number of moles of sucrose is115.0 g ÷ 342.3 g/mol = 0.335 mol.m₁ = mass of water = 350.0 g, and m₂ = mass of sucrose = 115.0 g, as given in the problem.Therefore, the molality of the solution is given by:m = (0.335 mol / 0.115 kg) ÷ (1 mol / 1 kg) = 2.91 mol/kg.Substituting these values in the formula for ΔTb, we get:ΔTb = Kb × m = 0.512 °C m⁻¹ × 2.91 mol/kg = 1.49 °C.100.0 °C + 1.49 °C = 101.49 °C.

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The pressure gauge on a compressed air tank that reads 43.2 mmHg is equivalent to 0.057atm.

Pressure in chemistry refers to the force of all the gas particle/wall collisions divided by the area of the wall.

Millimetre of mercury (mmHg) is a unit of pressure equal to the amount of fluid pressure one millimeter deep in mercury at zero degrees Celsius on Earth.

Atmospheric pressure (atm) is the unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius. It can be converted as follows:

Divide mmHg value by 760 i.e. 43.2 ÷ 760

43.2mmHg is equivalent to 0.057atm

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The entropy of a mixture is 96.44J K-1 mol -1

The formula for calculating the entropy of a mixture-

Δ\(S_{mix} =\)\(-nR(X_{O2} ln_{XO2} +X_{N2} lnX_{N2})\)

X=mole fraction

total no. of moles(t)=m + n

                             =2.4+9.2

                             =11.6 moles

now substituting the values-

entropy of mix=-11.6R(2.4/11.6 + 9.2/11.6)

                       =11.6R

( R=8.314 )        =11.6×8.314

                          =96.44J K-1 mol -1

hence, The entropy of a mixture is 96.44J K-1 mol -1

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Without oxygen, oxidation-reduction reactions, which are the foundation of many biochemical reactions and pathways, cannot occur. False.  oxidation-reduction reactions can take place in the absence of oxygen.

Oxidation-reduction reactions, also known as redox reactions, involve the transfer of electrons from one molecule to another. These reactions are the basis of many biochemical reactions and pathways, but they do not necessarily require the presence of oxygen.In fact, many redox reactions that are important in biochemistry occur in the absence of oxygen. For example, in cellular respiration, glucose is oxidized and electrons are transferred to molecules such as NADH and FADH2, which then transfer them to the electron transport chain, ultimately producing ATP. This process can occur in the presence or absence of oxygen, depending on the organism and the type of respiration that is taking place.Additionally, many other important redox reactions occur in biochemistry, such as photosynthesis, in which light energy is used to transfer electrons from water to carbon dioxide, and fermentation, in which the oxidation of organic molecules generates energy without the use of oxygen. Therefore, oxidation-reduction reactions can take place in the absence of oxygen.

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The evidence in figure 2 and table 1 which describes the changes in the rock after a year is the presence of a round edge.

This is referred to as the breaking down or dissolving of rocks and minerals on Earths surface through elements such as wind, water etc.

In the diagram given, the rock previously had a sharp edge but as time went on there was breakdown of the edges which resulted in it becoming round and is therefore the evidence that weathering most likely occurred in the rock.

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The third picture is the answer

Explanation:

there are 2 hydrogen atom 1 oxygen

Answer:

Specular reflection

Explanation:

Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection. Light reflects from a smooth surface at the same angle as it hits the surface

Answer:

B

Explanation:

Since the reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. A material that relects light is bouncing it

At 2861 degree Celsius the iron begins to boil. At 1,538 °C the substance begins to melt.

The melting point is the point at which the liquid and solid forms of a solid can exist in equilibrium. It can also be defined as the point at which a solid changes into a liquid under normal atmospheric pressure.

The equilibrium point at which water vapor, liquid water, and solid ice can exist in equilibrium is the only point at which the pressure and temperature of water vapor are the same. The equilibrium point of water vapor is the point at which the partial vapor pressure is the same as that of liquid water at the exact temperature of 273.1600 K.

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