How much heat will be absorbed when 38.2 g of bromine reacts with
hydrogen gas according to the following equation?
H2+ Br2 → 2HBr
H = 72.80kJ

Answer:

The first thing that you need to do here is to figure out the mass of the sample.

To do that, you can use its volume and the fact that aluminium is said to have a density of

2.702 g cm

−

3

, which implies that every

1 cm

3

of aluminium has a mass of

2.702 g

.

Explanation:

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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Answer:

Calcium and magnesium sulphide react to form calcium sulphide and magnesium metal.

Explanation:

Ca + MgS → CaS + Mg

The reaction between calcium and magnesium sulfide produces calcium sulfide and magnesium metal. The balanced equation can be given as Ca + MgS → CaS + Mg.

An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both side of the reaction have an equal balance of mass and charge.

Conservation of charge as well as mass, equation and reaction balance, etc. The components and outcomes of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified. The reaction between calcium and magnesium sulfide produces calcium sulfide and magnesium metal. The balanced equation can be given as Ca + MgS → CaS + Mg.

Therefore, the balanced equation can be given as Ca + MgS → CaS + Mg.

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To determine the standard electrode potential of silver and the activity coefficient of silver solution, we can perform a cell potential measurement experiment using a silver-silver chloride electrode

Silver-silver chloride electrode as the reference electrode and a standard hydrogen electrode as the other electrode.

The half-cell reaction at the silver electrode is:

Ag+(aq) + e- -> Ag(s)

The overall cell reaction is:

2H+(aq) + 2e- -> H2(g) + 2Ag+(aq) -> 2Ag(s) + 2H+(aq)

The cell potential (E) can be measured and used to calculate the standard electrode potential of silver (E°Ag) using the Nernst equation:

\(E = E^{ \textdegree} Ag - (RT / nF) * ln(aAg+ a \textdegree Ag+)\)

where R is the gas constant, T is the temperature, n is the number of electrons transferred in the reaction, F is the Faraday constant, aAg+ is the activity of the silver ion in solution, and a°Ag+ is the standard state activity of the silver ion.

By measuring the cell potential at different concentrations of silver ions and using the Nernst equation, we can calculate the activity coefficient of silver solution.

The activity coefficient is a measure of the deviation of the solution from ideal behavior and is important in electrochemical applications where the concentration of ions may be high.

Overall, this experiment allows us to determine the standard electrode potential of silver and the activity coefficient of silver solution, which are important parameters in electrochemical applications.

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The equilibrium constant for this reaction is 5.8*10⁻¹⁵.

What is equilibrium constant ?

A figure expressing the proportion between the quantities of reactants and products present at equilibrium in a reversible chemical process at a specific temperature.

What is reaction ?

The conversion of one or more chemicals, known as reactants, into one or more new compounds, known as products, is referred to as a chemical reaction.

Standard gibbs free energy

ΔG= -RtInR

Ine K = - ΔG/RT

K = e-ΔG/RT

where, R = 8.314J/ Mol-K,

T= 30+2+3= 33K

⇒Equilibrium constant

K= e- 82.6*1000J/8.314 J/ mol K*303 K

K= e- 32.78

=5.8*10⁻¹⁵

Equilibrium constant K = 5.8*10⁻¹⁵

Therefore, the equilibrium constant for this reaction is 5.8*10⁻¹⁵.

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Answer:

Silica.

Explanation:

Argon fluorohydride or argon hydrofluoride is an inorganic compound with the chemical formula HArF. It is a compound of the chemical element argon.

Neon is a very inert element, however, it has been reported to form a compound with fluorine. It is still questionable if true compounds of neon exist, but evidence is mounting in favor of their existence.

A 100.0 mL sample of natural water was titrated with 13.57 mL of 0.1123 M Na OH solution to reach a light pink  are the phenolphthalein end point. The number of millimoles of Na OH required for the titration is 1.525011 millimoles. Titration is a technique used in chemistry

to identify the quantity of a substance by adding a reactant until the chemical reaction is completed. In titration, a solution of known concentration (the titrant) reacts with a solution of unknown concentration (the analyte) to determine its concentration. Titration of natural water with Na OH In this case, we are titrating natural water with Na OH to find the concentration of the unknown solution. The balanced chemical reaction for the titration of natural water with Na OH is:H2O + Na OH → Na+ + OH- + H2O

The volume of NaOH required to reach the end-point of the titration is 13.57 mL. The molarity of Na OH used for the titration is 0.1123 M. We can use the following formula to calculate the number of millimoles of Na OH required for the titration Millimoles of Na OH = (Volume of Na OH × Molarity of NaOH) / 1000Substitute the given values in the above equation and solve for the millimoles of Na OH required for the titration. Millimoles of Na OH = (13.57 mL × 0.1123 M) / 1000= 0.001525011 millimoles Therefore, the number of millimoles of NaOH required for the titration is 1.525011 millimoles.

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Hydration occurs when minerals are dissolved in water. This means that minerals absorb water and expand. Hence, the correct answer is dissolved into water.

Hydration is the procedure of blending an element with water. It's a chemical reaction that takes place between a chemical compound and water molecules, which helps to break down and dissolve the substance being hydrated.

The hydration process in chemistry entails taking a substance and breaking it down into its component parts. This occurs when a compound or molecule takes in water, which results in the separation of the bonds between the atoms or ions.

The newly-formed ions interact with the water molecules, resulting in a new, hydrated compound.

Hydration can also occur naturally in the body. This is why it is essential to drink enough water throughout the day to remain hydrated. Therefore the correct answer is dissolved into water.

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The pH of the buffer solution is approximately 10.35.

A buffer solution is composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. In this case, we have a buffer containing methylamine (CH3NH2) and methylammonium chloride (CH3NH3Cl). Methylamine is a weak base, and its conjugate acid is methylammonium ion (CH3NH3+).

To find the pH of the buffer, we need to consider the equilibrium between the weak base and its conjugate acid:

CH3NH2 (aq) + H2O (l) ⇌ CH3NH3+ (aq) + OH- (aq)

The equilibrium constant expression for this reaction is:

Kb = ([CH3NH3+][OH-]) / [CH3NH2]

Given that the pKb of methylamine is 3.35, we can use the relation pKb = -log10(Kb) to find Kb:

Kb = 10^(-pKb)

Once we have Kb, we can use the Henderson-Hasselbalch equation to calculate the pH of the buffer solution:

pH = pKa + log10([A-]/[HA])

In this case, CH3NH3Cl dissociates completely in water, providing CH3NH3+ as the conjugate acid, and Cl- as the spectator ion. Therefore, [A-] = [CH3NH3+] and [HA] = [CH3NH2].

By substituting the known values into the Henderson-Hasselbalch equation and solving, we find that the pH of the buffer is approximately 10.35.

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Answer:

accepts an H⁺

Explanation:

The following balanced ionic equation is given in this question;

HCl + H₂O → H₃O⁺ + Cl⁻

According to Brønsted–Lowry acid–base theory, a base is any substance that can accept hydrogen ions or protons (H+). Using this definition for the above equation, water (H2O) accepts a proton or H+ that was donated by HCl to form H30+ (hydronium ion), hence, water is acting as a BASE in this reaction because it accepts an H+.

The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Aldohexoses have four chiral focuses and, in this way, 24 = 16 isomers. There will be eight d-isomers and eight l-isomers. Thusly, the quantity of enantiomer matches is 8 (2n−1).

An aldohexose has four chiral focuses.

So there are

24=16

optical isomers.

Their perfect representations are the L-aldohexoses, the other 8 of the 16.

Their names are L-allose, L-altrose, L-glucose, and so on.

Consequently, every one of the 16 aldohexoses has its own name.

The four chiral focuses in glucose show there might be upwards of sixteen (24) stereoisomers having this constitution. These would exist as eight diastereomeric sets of enantiomers, and the underlying test was to figure out which of the eight related to glucose. This challenge was acknowledged and met in 1891 by German physicist Emil Fischer. His fruitful exchange of the stereochemical labyrinth introduced by the aldohexoses was a sensible masterpiece, and it is fitting that he got the 1902 Nobel Prize for science for this achievement. At the time Fischer embraced the glucose project laying out the outright setup of an enantiomer was unrealistic. Thusly, Fischer pursued an erratic decision for (D)- glucose and laid out an organization of related aldose setups that he called the D-family. The identical representations of these arrangements were then assigned the L-group of aldoses. To represent utilizing present-day information, Fischer projection formulas and names for the D-aldose family (three to six-carbon atoms) are displayed underneath, with the uneven carbon atoms (chiral focuses) hued red.

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Answer:

Explanation:Due to the mental pressure,

                       Due to peer pressure,

                      Lack of love and affection from the family members.

                      Influence from the T.V advertisement.

Doubling the concentration of Br2 would quadruple the rate of the reaction. (D)

This is because the rate of a reaction is proportional to the product of the concentrations of the reactants (in this case Br2). Therefore, if the concentration of Br2 is doubled, the rate of the reaction will quadruple.

This is because the reaction rate is proportional to the product of the concentrations of the reactants. As the concentration of Br2 increases, the rate of the reaction also increases because the number of collisions between Br2 molecules and the reactant molecules increases.

The increased collisions increase the chances of the reactants forming products. Therefore, doubling the concentration of Br2 will cause the rate of the reaction to quadruple.

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Answer:

asdd

Explanation:

adsade4223

Answer:

Explanation:

Here, we want to calculate the initial volume of the container

Mathematically, we know that volume and pressure are inversely related. What this means is that as volume increases, pressure is expected to decrease and as pressure increases, volume is expected to decrease

A mathematical link between these two is as follows:

The above is according to Boyles' law.

The values with subscript 1 are the initial values, while the values with the subscript 2 are the final values

Thus:

V1 = ?

P1 = 1.25 atm

V2 = 1L

P2 = 3.75 atm

From the relation:

Answer:

273.6 g

Explanation:

mass =(density)(volume)

mass=(5.7g/cm^3 )(48 cm^3)

cancel out your cm^3 and your are left with grams

multiply (5.7g)(48)=273.6 g

The mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

Density is defined as the degree to which a material is packed together.

It is also defined as a mass per unit volume of the substance.

Its SI unit is kilogram per cubic meter or  gram per meter.

Density can be expressed as

Density = mass / volume

Mass =  density x volume

As given, Density = 5.7 g/cm³

                Volume = 48 cm³

So, Mass =  5.7 g/cm³ x  48 cm³

               =  273.6 grams

Thus, the mass of an object with a density of 5.7 g/cm³ and a volume of 48 cm³ is 273.6 grams.

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it's nonmetal

Sulfur has nonmetal properties. It is fragile, lacks shine, and cannot conduct electricity. Sulfur is located in the third period of group 16/VIA on the periodic chart. The chalcogens or oxygen group is the name of the group.

Natural substances known as non-metals are brittle and thermally and electrically inert (can not be easily rolled, molded, extruded, or pressed). The non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium.

The group of nonmetals consists of seven elements:

Hydrogen (sometimes called an alkali metal) (sometimes considered an alkali metal)

Carbon. \sNitrogen. \sOxygen. \sPhosphorus. \sSulfur. \sSelenium.

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It is used in the design of engines, where changes in pressure and temperature are used to convert thermal energy into mechanical work. It is also used in meteorology to predict weather patterns and in the study of the Earth's atmosphere.

Pressure and temperature are two fundamental physical quantities that are closely related in many physical processes. Understanding the relationship between these two quantities is essential in many scientific and engineering fields. This relationship can be described by the ideal gas law, which states that the pressure of an ideal gas is directly proportional to its temperature when the volume and number of particles are constant. In other words, when the temperature of a gas increases, its pressure increases, and vice versa. This can be explained by the kinetic theory of gases, which assumes that gases are made up of a large number of small particles that are in constant motion. The speed of these particles is proportional to the temperature of the gas. As the temperature of the gas increases, the particles move faster and collide more frequently with the walls of the container, resulting in an increase in pressure. Similarly, when the temperature of the gas decreases, the particles move slower and collide less frequently with the walls of the container, resulting in a decrease in pressure. This relationship between pressure and temperature is essential in many scientific and engineering applications.

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Answer:go molecule you some b1tc1es

Explanation:

Answer:

The velocity of the bb when it reaches a height of 203 m can be determined using the laws of projectile motion. Since the bb is moving vertically upwards, its velocity at that height will be zero.

brainlest?

Answer: v = 83.96 m/s

Assuming the acceleration due to gravity is approximately 9.8 m/s^2, we can use the principles of projectile motion and energy conservation.

Using the equation for the vertical displacement of an object in free fall:

Δy = (v₀² - v²) / (2g)

Δy = vertical displacement (203m)

v₀ = initial velocity (105 m/s)

v = final velocity (not known yet)

g = accerlation due to gravity (9.8 m/s^2)

Lets rearrange the equation to solve for the final velocity:

v = v = √(v₀² - 2gΔy)

Substituting the given values:

v = √(105² - 2 * 9.8 * 203)

v ≈ √(11025 - 3979.6)

v ≈ √(7054.4)

v ≈ 83.96 m/s

Therefore, when the BB pellet is at the height of 203m, its velocity will be approximately 83.96 m/s.

Starting at chemical equilibrium, increasing the concentration of M will transiently increase the rate of formation of Y and Z.

Option b is the correct answer because it aligns with Le Chatelier's principle, which states that when a system at equilibrium is subjected to a stress, it will shift in a way that partially offsets the effect of the stress.

In this reaction, the increase in the concentration of M will be considered as a stress on the system. According to Le Chatelier's principle, the system will respond by trying to counteract this increase. In this case, the system will shift towards the formation of products Y and Z in order to consume some of the excess M.

However, it's important to note that this increase in the rate of formation of Y and Z will only be transient, meaning it will be temporary. Eventually, the system will reach a new equilibrium with the altered concentrations of reactants and products.

Adding a catalyst would alter the final concentrations of products and reactants at equilibrium.

This statement is incorrect because a catalyst does not alter the final concentrations of products and reactants at equilibrium. A catalyst only speeds up the rate of the reaction but does not affect the position of the equilibrium.

Starting at chemical equilibrium, decreasing the concentration of M will increase the concentration of Y.

This statement is incorrect because according to Le Chatelier's principle, decreasing the concentration of M would cause the system to shift towards the reactants to counteract the decrease. Therefore, it would result in a decrease in the concentration of Y, not an increase.

Because the reactants and products are different molecules, this is not a reversible reaction.

This statement is incorrect because the reversibility of a reaction is not solely determined by whether the reactants and products are different molecules. Reversible reactions can involve different molecules as reactants and products. The reversibility of a reaction is based on its thermodynamics and the ability to proceed in both forward and reverse directions.

Starting at chemical equilibrium, increasing the concentration of Y will decrease the concentration of M and N.

This statement is incorrect because increasing the concentration of Y would not directly affect the concentrations of M and N. The reaction M + N → Y + Z does not involve Y as a reactant, so its concentration would not directly influence the concentrations of M and N.

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Answer:

B. Radar uses radio and the siren uses sound waves. both exhibit in the Doppler effect.

sorry if this is wrong

Answer:

lets take an glass jar for example

Explanation:

The metal lid and the glass jar absorb different amounts of thermal energy and therefore expand at different rates. Metals, being good conductors of heat, are able to absorb thermal energy from the hot water more easily. Glass, on the other hand, being a bad conductor of heat, cannot absorb the heat energy as well

The silver coating on the spoon is produced. When electrolyzing a spoon made from iron with silver, the anode, cathode, and electrolyte that can be used are as follows:

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Answer:

1. No 1 looks like a statement and not a question.

2.Ionic compounds are usually formed from the transfer of electrons from metals to Non metals. All others are Ionic compounds except HCl(Its a covalent compound).

3. The Formula would be K2S. Exchange of Radicals takes place. Sulphur has a -2 charge and potassium has a +1 charge. when they both exchange radicals... The compound is K2S.

4.Group 1 elements have only 1 electron in their outermost shell.

5. its charge will be +1 because it loses the 1 electron in its outermost shell.

6.Group 2 elements have 2electrons in their Valence shell.

7.Already answered. same as No 5.

8. Group 16;Also known as group 6. They have only 6 electrons in their outermost shell.

9.When they want to become stable... they acquire 2electrons to complete their octet... so they possess a -2 charge by forming an ion.

10. i)They form ions when Dissolve in solutions

ii) They are hard and brittle

iii) They have high boiling points

Explanation:

here is the answer attached

Solids, liquids, and gases differ in terms of packaging of the atoms in its constituent atomic level.

Solids, liquids, and gases are the three main states of matter. They differ in the way their atoms or molecules are arranged and how they interact with one another. Solids have a definite shape and a definite volume. The atoms or molecules in a solid are tightly packed together and are not free to move around. Solids also have a low compressibility and a high density. Liquids have a definite volume but no definite shape. They take the shape of their container. The atoms or molecules in a liquid are close together but are free to move around. Liquids have a low compressibility and a lower density than solids. Gases have no definite shape or volume. They expand to fill their container. The atoms or molecules in a gas are widely spaced and are free to move around. Gases have a high compressibility and a low density. Examples of gases include air, oxygen, and natural gas. In summary, Solids have a fixed shape and volume, liquids take the shape of their container, have a definite volume and gases have no fixed shape or volume and expand to fill their container.

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