write a structural formula for (z)-1-cyclopropyl-1-pentene (show stereochemistry as needed).

Answer:

Measuring temperature is important in determining whether a change in enthalpy is exothermic or endothermic because it allows us to observe the direction of heat flow during a chemical reaction. Enthalpy is a measure of heat energy transferred during a chemical reaction, and is represented by the symbol "ΔH". During an exothermic reaction, heat is released and transferred from the system to the surroundings, resulting in a decrease in the temperature of the system. In contrast, during an endothermic reaction, heat is absorbed by the system from the surroundings, resulting in an increase in the temperature of the system. By measuring the temperature change of the system during a chemical reaction, we can determine whether the reaction is exothermic or endothermic. A decrease in temperature indicates an exothermic reaction, while an increase in temperature indicates an endothermic reaction. Therefore, measuring temperature is crucial in determining the direction of heat flow and whether a change in enthalpy is exothermic or endothermic.

The pH at the equivalence point in titrating the 0. 100 M solution of HBr with 0. 080 M NaOH is 7.

The Concentration of the HBr = 0.100 M

The  Concentration of the NaOH = 0.080 M

The chemical equation is as follows :

HBr + NaOH → NaBr + H₂O

The HBr is the strong acid, and the NaOH is the strong base. When the strong acid is  titrated with the strong base, then an equivalence point is always be obtained at the pH = 7.0.

Thus, the pH at the equivalence point in titrating the 0. 100 M solution HBr is the 7.0.

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Answer:

4219500 centimeters

Explanation:

I hope this helped!

Answer: A12????

Explanation:

Answer:

The answer is option 1.

Explanation:

Lithium is a Group 1 element. So the correct charge for lithium should be Li+.

Answer:

(a)\(Li^{2+}\)

Explanation:

Answer is (a)\(Li^{2+}\)

As lithium has only one valence electron, it will lose one electron to form a cation with charge 1+ . Thus the correct Li ion is \(Li^{1+}\)

Beer-law Lambert's states that a dye's absorbance is inversely proportionate to its concentration in cases like crystal violet.

The Beer-Lambert Law (also known as the Beer-Lambert-Bouguer Law) states that the absorbance of a dye such as crystal violet is directly proportional to its concentration. This means that as the concentration of the dye increases, the amount of light that is absorbed by the dye also increases. This law is important for measuring the concentration of a solution by measuring its absorbance of light. As the absorbance is directly proportional to the concentration, knowing the absorbance allows for the concentration to be calculated. Beer Lambert law, also known as the Beer-Lambert law of absorption, states that there is a linear relationship between the concentration of an absorbing species and the absorptivity of the material. In other words, the greater the concentration of a substance, the greater its ability to absorb light. This law is often used to measure and analyze the concentration of a particular substance in a given sample, such as the concentration of a dye in a solution.

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Answer: Neutron

Explanation:

Protons have a positive charge (+).

Electrons have a negative charge (-).

Neutrons have no charge.

The temperature needed for 41 grams of O₂ to expand to a volume of 2L under a pressure of 1 atm is approximately 19.023 Kelvin.

We know that the ideal gas equation is:

PV = nRT ......(i)

where P ⇒ pressure

V ⇒ volume of the gas

n ⇒ number of moles of the gas

T ⇒ temperature in Kelvin

R ⇒ ideal gas constant = 0.082057 (L·atm/(mol·K))

Now, as per the question:

Mass of O₂ = 41 grams

The volume of expanded gas, V = 2 L

Pressure, P = 1 atm

We need to determine the temperature needed for the gas to expand to 2 L.

For that, we need to calculate the number of moles of O₂ gas first.

Since,

no. of moles = mass of the gas / molar mass of the gas

(∵ molar mass of O₂ = 32 g)

moles = 41 g / 32 g/mol

moles ≈ 1.28125 mol

Now,  to solve for temperature (T),

The ideal gas equation can be written as:

\(T=\frac{PV}{nR}\)  ......(ii)

Now, substituting the given values in the equation (ii):

\(T = \frac{(1)*(2)}{(1.28125)*(0.082057)} \frac{(atm).(L)}{(mole).(L.atm/mol.K)}\)

\(T = \frac{2}{0.105136} \frac{atm.L}{(L.atm)/K}\)

T ≈ 19.023 K

Thus, the temperature needed for 41 grams of O₂ to expand to a volume of 2 L under a pressure of 1 atm is approximately 19.023 Kelvin.

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a. Example of physical change: Melting of ice

Example of chemical change: Burning of paper

b. Example of physical property: Density of a substance

Example of chemical property: Reactivity of a substance

a. A known example of a physical change is the change of state of water. When water is heated, it undergoes a physical change from a solid state (ice) to a liquid state (water) and further to a gaseous state (water vapor). The chemical composition of water remains the same throughout these changes, and only the arrangement and energy of the water molecules change.

On the other hand, a known example of a chemical change is the combustion of wood. When wood is burned, it undergoes a chemical change where the molecules of wood react with oxygen from the air to produce carbon dioxide, water vapor, and other combustion products. The chemical composition of wood is altered during this process, and new substances are formed.

b. Physical properties are characteristics of a substance that can be observed or measured without changing its chemical composition. For example, the physical properties of water include its boiling point, melting point, density, color, and transparency. These properties describe how water behaves and reacts under different conditions, but they do not involve any changes in its chemical identity.

Chemical properties, on the other hand, describe the ability of a substance to undergo chemical changes and react with other substances. For example, the ability of iron to rust when exposed to oxygen and moisture is a chemical property. It involves a chemical reaction where iron reacts with oxygen to form iron oxide.

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Answer:

Solution given:

22.4 liter of O2=1 mole of O2

694litre of O2=\( \frac{1}{22.4} \times 694\)

=30.98or 31 mole of O2

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

because H (hydrogen) is very reactive with other elements

Explanation:

Pt serves as the cathode, Cd as the anode.

I'm quite sure this is the answer

Hope it helps!

Answer:

???? Hmmmmmmkkkkkkkk

Answer:

brainly brainly brainly

pls cange

Explanation:

The end temperature of the solution is 200 F, which is the same as the beginning temperature of the two solutions.

What exactly is adiabatic mixing?

Adiabatic mixing occurs when two chemicals are combined without exchanging heat with the surrounding environment. In other words, the mixing is done in an insulated container so that no heat is lost or acquired from the surroundings. This means that the end temperature of the combined substances will be the same as their beginning temperatures.

Because both solutions are aqueous sodium hydroxide solutions, we may assume that their heat capacities and masses are equivalent. As a result, we may equalise the mass and heat capacity terms:

C1× m1 = C2 × m2

As a result, the solution's end temperature equals the beginning temperature of the two solutions, which is 200 F.

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Answer:

The correct answer is A. B. The arrow in the image that represents the reflected ray is the one labeled "B," which shows the direction of the ray after it has bounced off the air-water boundary.

There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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Answer: The solubility of this compound in pure water is 0.012 M

Explanation:

Solubility product is defined as the equilibrium constant in which a solid ionic compound is dissolved to produce its ions in solution. It is represented as \(K_{sp}\)

The equation for the ionization of the  is given as:

\(Ca(OH)_2\rightarrow Ca^{2+}+2OH^-\)  

By stoichiometry of the reaction:

1 mole of  \(Ca(OH)_2\) gives 1 mole of \(Ca^{2+}\) and 2 mole of \(OH^-\)

When the solubility of  \(Ca(OH)_2\) is S moles/liter, then the solubility of \(Ca^{2+}\)  will be S moles\liter and solubility of \(OH^-\) will be 2S moles/liter.

\(K_{sp}=[Ca^{2+}][OH^{-}]^2\)

\(6.5\times 10^{-6}=[S][2S]^2\)

\(S=0.012M\)

Thus solubility of this compound in pure water is 0.012 M

The structure of ozone (O3) is bent (or V-shaped), with two covalent bonds between the central oxygen atom and the outer oxygen atoms. The bond angles are approximately 117 degrees. Therefore, the structure of ozone is a bent molecule with the same length of chemical bonds.

The structure of ozone is bent because the oxygen atoms are arranged in a V-shape, with a bond angle of approximately 117 degrees. There are two covalent bonds between the central oxygen atom and the outer oxygen atoms. These bonds have the same length because they involve the same atoms and bond type. Therefore, the structure of ozone is a bent molecule with the same length of chemical bonds.

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Answer:

to remove an electron

Explanation:

the amount of energy required to remove an electron from an isolated atom

Ionization energy, also known as ionization energy, is the minimal amount of energy needed to free the electron with the loosest bond from an isolated gaseous atom, positive ion, or molecule in physics and chemistry.

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Characteristic line spectra only appear in the visible region of light.

This is true because this is the only region we can see the line spectra.

Visible light or white light comprises of seven colours which can produce wavelengths and frequencies of Spectra by either  emission or absorption of light/ radiation on matter.

To identify elements,we use  the  visible lines  emitted from the excited atoms since they all have their own emission spectrum unique to each of them.

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The valence states provided are general representations and may vary depending on specific conditions and coordination environments.

a. Uvarovite: The mineral formula for uvarovite is Ca3Cr2(SiO4)3. In this formula, the valence state of calcium (Ca) is +2, the valence state of chromium (Cr) is +3, and the valence state of silicon (Si) is +4. Oxygen (O) is usually assigned a valence state of -2.

b. Azurite: The mineral formula for azurite is Cu3(CO3)2(OH)2. In this formula, the valence state of copper (Cu) is +2, carbonate (CO3) has a valence state of -2, and hydroxide (OH) has a valence state of -1.

c. Cuprite: The mineral formula for cuprite is Cu2O. In this formula, the valence state of copper (Cu) is +1, and oxygen (O) is usually assigned a valence state of -2.

d. Gypsum: The mineral formula for gypsum is CaSO4·2H2O. In this formula, the valence state of calcium (Ca) is +2, sulfur (S) has a valence state of +6, and oxygen (O) is usually assigned a valence state of -2. The water molecules (H2O) do not have a net charge.

e. Galena: The mineral formula for galena is PbS. In this formula, the valence state of lead (Pb) is +2, and sulfur (S) has a valence state of -2.

It's important to note that the valence states provided are general representations and may vary depending on specific conditions and coordination environments.

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Answer:

As a marine chemist, you study the chemical properties of different bodies of water with the goal of making them safer and cleaner. For this to happen, you determine the potential effects of foreign chemicals, as well as the impact of aquatic transportation and construction, on rivers, lakes, and oceans.

Explanation:

The process of changing gaseous gallium to liquid gallium is called condensation.

What is gallium?
The chemical element gallium has the atomic number 31 and the symbol Ga. Gallium is a metal that belongs to the periodic table's group 13 and was first discovered by French chemist Paul-Émile Lecoq d'une Boisbaudran in 1875. It is similar to the other metals in this group (aluminium, indium, and thallium). Due to boron's small atomic size and lack of a d-orbital reach, gallium and boron show relatively less similarity. Gallium is an element that is soft and silvery at ordinary pressure and temperature. It turns silvery white when it's liquid. Gallium may fracture conchoidally if excessive force is used. Gallium has been widely used to create alloys with low melting points ever since it was discovered in 1875. As a dopant in semiconductor substrates, it is also utilised in semiconductors.

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Answer:

5

Explanation:

pH = -log[OH]

pH = -log[1.0 x 10–5]

pH = -log[10–5]

pH = -(-5)log10

pH = +5

the pH of the hydrochloric acid is 5.

pH is a numerical indicator of how acidic or basic aqueous or some other kind of liquid solutions are.

Calculation of pH

Given data:

Concentration of HCl = 1.0 × \(10^{-5}\) mol/dm3.

pH can be calculated by the formula:

\(pH = -log[H^{+}]\)

Now, put the value of the concentration of hydrogen ion.

\(pH = -log[H^{+}]\\pH = -log[1.0 *10^{-5}]\\pH = 5\)

Therefore, the pH of the hydrochloric acid is 5.

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In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

Answer:

Look in explanation:

Explanation:

The definition of temperature is the measure of kinetic energy(which is the energy used to measure motion). Since phase changing is only changing the energy, the kinetic energy will not change. There is only energy used to separate the molecules. You can see on a phase change graph that the temperature stays constant during a phase change and will ONLY change after the change has already been done.