Which of the following straight-chain alkanes has the lowest boiling point?
A. nonane
B. heptane
C. pentane
D. decane
E. ethane

Answer

The formula form of Manganese (IV) perbromate is

Explanation

The formula of Manganese is Mn

The formula for perbromate is BrO₄⁻

Oxidation number of Manganese (IV) = +4, That is Manganese (IV) is Mn⁺⁴

Therefore, multiply the charge of manganese by 1 and perchlorate by 4 t

Because the excess chemical compound can be contaminated with other chemical compound and some reaction can be happen thats why returning chemicals to a reagent bottle introduce contaminants.

There is a chance for the chemicals which is taken out from the reagent bottle to be contaminated with other substances. the chemical property of some of these chemicals may change on contact with air. all these factors may affect the quality of further reactions that were supposed to be carried out by these unused reagents

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When conducting a crystallization process, it is important to cool the solution at a slow and controlled rate to encourage crystal formation.

An ice bath is preferable over cold water or ice alone because it can maintain a consistent low temperature without causing the solution to freeze solid. Ice alone is too cold and can cause the solution to freeze rapidly, preventing the formation of crystals. Cold water, on the other hand, is not able to maintain a consistent low temperature as the heat from the solution will quickly dissipate into the surrounding water, resulting in a slower cooling rate.

An ice bath, which is a mixture of ice and water, provides a more stable and uniform cooling environment for the solution, allowing for the crystals to form at a slower rate. Additionally, an ice bath can contact the entire portion of the container immersed in the mixture, ensuring that the solution is evenly cooled. Overall, an ice bath is the preferred method for cooling a solution during the process of crystallization.

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complete question is:-

one of the techniques used in this experiment was that of crystallization. when cooling a solution in the process of crystallization, why would an ice bath be preferable over cold water or ice alone? none of the answers shown are correct. ice is too cold and will freeze any solution. cold water would dilute the solution making it impossible for crystals to form. a mixture of ice and water will keep the temperature above freezing and will contact the entire portion of the container immersed in the ice/water mixture.  EXPLAIN.

Answer:

2KClO3 = 2KCl + 3O2

I hope it's helps you

Answer:

The Answer to your question is

A. the metal mixture began to separate

Explanation

Just took the quiz

Answer:

the answer is C in usatestprep 1,11,and 111

Explanation:

The circumference of a circle is 11π cm. Then the area is 30.25 π cm.

The term area is defined as the region bounded by the shape of an object. The area of a shape is the space covered by a figure or any two-dimensional geometric shape in a plane.

The area of a shape is the measurement of its surface. To calculate the area of a rectangle or square, multiply the length and width of the rectangle or square.

C = pi d

Therefore,

11π cm = diameter

Radius is 1/2 the diameter

Then radius = 5.5π cm

Area = πr²

Area = 30.25 π

Thus, The circumference of a circle is 11π cm. Then the are is 30.25 π cm.

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Answer:

red, orange, brown, yellow, black

Explanation:

The intermolecular force that is overcome when hexane is converted from a liquid to a gas is  London dispersion forces

Bulk properties, such as the boiling and melting points of liquids, are determined by intermolecular forces. When molecules in a liquid have enough thermal energy to overcome the forces holding them together, called intermolecular forces, bubbles of vapour are created inside the liquid. Similar to liquids, solids melt when their molecules gather sufficient thermal energy to dislodge the intermolecular forces holding them in place. Electrostatic in nature, intermolecular forces result from the interaction of positively and negatively charged species. Intermolecular interactions are the sum of both attractive and repulsive elements, similar to covalent and ionic bonds. Intermolecular interactions are most significant for solids and liquids because electrostatic interactions rapidly diminish with increasing distance between molecules.

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Answer: The answer is C.) NH3

Explanation:

Ammonia is a covalent compound because the nitrogen and hydrogen atoms are nonmetals in nature. Ammonia (NH3) is a covalent compound because the nitrogen and hydrogen atoms are nonmetals in nature, they don’t have any tendency of either accepting or donating the electrons but both nitrogen and hydrogen atoms have a tendency to share their valence electron with each other.

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Answer: The final temperature is 248.7 K

Explanation:

To calculate the final temperature of the system, we use the equation given by Gay lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant volume.

Mathematically,

\(\frac{P_1}{T_1}=\frac{P_2}{T_2}\)

where,

\(P_1\text{ and }T_1\) are the initial pressure and temperature of the gas.

\(P_2\text{ and }T_2\) are the final pressure and temperature of the gas.

We are given:

\(P_1=951.72kPa\\T_1=653.34K\\P_2=362.29kPa\\T_2=?\)

Putting values in above equation, we get:

\(\frac{951.72}{653.34}=\frac{362.29}{T_2}\\\\T_2=248.7K\)

Thus the final temperature is 248.7 K

When a cell from solution b is placed in solution a, water will enter inside the cell and it will swell up.

There are three kinds of solutions- isotonic, hypotonic, and hypertonic solutions.

When a solution has the same osmotic concentration as the cell, it is known as an isotonic solution. If a cell is placed in such a solution, water neither enters the cell nor exits from it and the cell remains the same in size.

When a solution’s osmotic concentration is more than a cell's, it is known as a hypertonic solution.

When a cell is placed in such a solution it loses water and shrinks.

When a solution’s osmotic concentration is less than a cell's, it is known as a hypotonic solution.

When a cell is placed in such a solution, water enters inside it and the cell swells up.

In the given situation, solution a is hypotonic with respect to solution b.

So, if a cell from solution b is placed in solution a, water will enter the cell and it will swell up.

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The given data is of NMR spectroscopy and the only molecule identified from it is 2,2-dimethyl-1-phenylbutan-1-one.

NMR spectroscopy is an essential technique that uses radio frequency pulses to measure an atomic nucleus' resonant frequency in relation to its chemical or environmental surroundings (for example, the most prevalent stable isotopes 1H, 13C, and 15N).

2,2-dimethyl-1-phenylbutan-1-one (C12H16O, Mol. wt. 176 g/mol) is the only pure organic molecule identified by the data provided (Mass, IR, 1H NMR, and 13C NMR).

Two orthoprotons "a" in 1H NMR spectroscopy produce a signal at 7.8 ppm as a result of interaction with neighboring protons. At 7.5 ppm, a multiplet of one para proton (B) and two meta protons (C) is seen. Methylene protons 'd' pair with nearby three protons to form a quartet of two protons at 1.4 ppm. Singlet at 1.3 ppm is produced by six equivalent protons (proton "e") of methyl groups. Due to interaction with two methylene protons, three protons "f" appear as a triplet at 0.9 ppm.

Carbonyl carbon (C1) appears in 13C NMR spectroscopy at 211 ppm. At 138 ppm, ipso carbon (C2) signals. The other four aromatic carbons provide a stronger signal at 128 ppm and the para carbon (C3) to emerge at 133 ppm (C4). The signal levels for carbons C5, C6, C7, and C8 are 48, 33, 23, and 7 ppm, respectively.

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Answer: the direction of decreasing temperature

Answer: The phases that exist at a temperature of 245 K and with a composition of 30 mol% of component 1 would depend on the specific Phase diagram of the system in question, it is not possible to accurately determine the phases and their compositions at the given condition.

Explanation: Phase diagrams are graphical representations of the equilibrium phases of a system as a function of temperature, pressure, and composition. They are unique to each system and can vary widely depending on the components involved. To accurately determine the phases and their compositions, the specific phase diagram of the system would need to be consulted, which typically includes information about the phases, compositions, and temperature ranges where they exist.

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Answer:

Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.

Pair of compounds have the same empirical formula :C₂H₂ and C₆H₆

Given

Carbon compound

Required

The same empirical formula

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

C₂H₂ and C₆H₆

Empirical formula CH

(CH)₂=C₂H₂

(CH)₆=C₆H₆

C₂H₆ and C₃H₈

C₂H₆: Empirical formula CH₃

C₃H₈: Empirical formula C₃H₈

C₂H₅OH and CH₃OH ⇒ Empirical formula

CH₃CHO: Empirical formula : CH₃CHO

CH₃COOH: Empirical formula CH₂O

Answers:

Explanation:

Answer:

310

Explanation:

Answer:

A burning match represents an exothermic reaction. The chemicals release energy in the form of heat and light as the reaction progresses.

Explanation:

Sample Response

Answer:pressure

Explanation:

In a coffee-cup calorimeter, the parameter that is kept constant is the system's pressure.

A coffee-cup calorimeter is a simple, insulated device used for measuring the heat of a reaction or the specific heat capacity of substances. The setup consists of two nested Styrofoam cups with a lid and a thermometer inserted through the lid.

This calorimeter operates under constant pressure conditions because it is open to the atmosphere, allowing the pressure to remain equal to the surrounding environment. Since the container is not sealed, any pressure changes within the reaction can dissipate into the atmosphere, ensuring a constant pressure throughout the experiment.

The purpose of keeping pressure constant is to allow the accurate measurement of heat change, which can be calculated using the formula q = mcΔT, where q represents the heat change, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. By maintaining constant pressure, researchers can reliably measure the heat exchange between the reaction and the surrounding environment, making coffee-cup calorimeters an essential tool for determining the enthalpy changes of chemical reactions and the specific heat capacities of various substances.

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Explanation:

Can you please mark me the brillantest?

The contour interval is 20 m

The elevation at Y, of the point Y is 300 m

The elevation at B is 320 m

The elevation at C is 360 m

The vertical separation or difference in elevation between contour lines is referred to as a contour interval.

Every fifth contour line is a set of bold or thicker lines known as an index contour. The height of the terrain will also rise if the numbers linked with particular contour lines are rising.

There are three types of contour lines: intermediate, index, and supplementary.

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Option B is the correct answer

What is mole fraction ?

The mole fraction of a component in a mixture is a measure of the relative amount of that component in the mixture, expressed as a fraction of the total number of moles of all components in the mixture. The mole fraction is a unitless quantity that is used to describe the composition of a mixture in terms of the number of moles of each component present.

The mole fraction of a component i in a mixture can be calculated as follows:

X_i = n_i / (n_1 + n_2 + ... + n_n)

where X_i is the mole fraction of component i, n_i is the number of moles of component i, and n_1, n_2, ..., n_n are the number of moles of each of the other components in the mixture.

Change all to moles

mol of MgCl2 = mass MgCl2  / MW of MgCl2

MW of MgCl2 = 95.211 g/mol

mol of MgCl2 = 15.8  /95.211 = 0.1659 mol of MgCl2

mol of Mg+2 = mol of MgCl2 = 0.1659

mol of Cl- = 2 * mol of MgCl2 = 2*0.1659 = 0.3318

mol of water = mass water /MW  water =  255/18 = 14.166 mol of water

total mol = mol of water + mol of Mg+2 + mol of Cl = 0.1659 +14.166 +0.3318= 14.6637

Then

mol fraction of Cl = mol of Cl- / total mol = 0.3318/14.6637 = 0.0226 = 0.023

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Answer:

Methanol

Explanation:

The solvent in this solution is methanol

  Hence the other options are incorrect.

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Answer:

I think the answer is (B)

The equilibrium will shift

Le Chatelier’s principle states that an equilibrium will shift in order to reduce the stress of a change.

Le Chatelier’s principle

Le Chatelier’s principle describes how an equilibrium will react when a stressor is added. Stressors can include changes in temperature, pressure, volume, or concentration. All of these things change the Q value (reaction quotient) of an equilibrium. Le Chatelier’s principle says that after a stressor is introduced an equilibrium will shift so that the Q value equals the K value (equilibrium constant).

Temperature Shifts

The reaction of an equilibrium to a change in temperature depends on the equilibrium itself. If the equilibrium is endothermic (energy is absorbed), then a decrease in temperature will lead to a left shift. Since heat acts as a reactant in endothermic equilibriums, a decrease in the temperature acts like a decrease in the concentration of reactants. Thus, more reactants will be produced to reestablish equilibrium. This results in a left shift.

On the other hand, in an exothermic equilibrium (energy is released), a decrease in temperature will lead to a right shift. In exothermic equilibriums, heat acts as a product. So, if heat decreases, then so does the concentration of products. Therefore, more products will be produced to reestablish equilibrium. This results in a right shift.