Which of these molecules exhibits optical isomerism.

a. ccl4

b. ch3chclnh2

c. ch3chclch3

d. ch3ccl2ch3

Answer:

In another example (shown below) if the parent plants both have heterozygous (YG) genotypes, there will be 25% GG offspring in average. These percentages are determined based on the fact that each of the 4 offspring boxes in a Punnett square is 25% (1 out of 4)

I hope this helps! :D

The overall enthalpy of formation for potassium chloride is -4395 kJ/mol.

Let us use Hess's Law to estimate the overall enthalpy of formation for potassium chloride. K(s) + 12 Cl₂(g) → KCl(s). The enthalpy of sublimation for K is 90 kJ/mol. So, K(s) → K(g) ΔH = 90 kJ/mol. The bond dissociation energy of Cl₂ is 239 kJ/mol. So, Cl₂(g) → 2 Cl(g) ΔH = 2 x 239 = 478 kJ/mol.

The electron affinity of Cl is -349 kJ/mol. So, Cl(g) + e- → Cl⁻(g) ΔH = -349 kJ/mol. The ionization energy of K is 419 kJ/mol. So, K(g) → K⁺(g) + e⁻ ΔH = 419 kJ/mol. The lattice formation enthalpy of KCI is -690 kJ/mol. So, K⁺(g) + Cl⁻(g) → KCl(s) ΔH = -690 kJ/mol.

The enthalpy of formation of potassium chloride is the sum of the above reactions. ΔHf for KCl(s) = ΔHsub(K) + ΔHdiss(Cl₂) + ΔHea(Cl) + ΔHi(K) + ΔHlf(KCl) ΔHf for KCl(s) = (90 kJ/mol) + (478 kJ/mol) + (-349 kJ/mol) + (419 kJ/mol) + (-690 kJ/mol) = -4395 kJ/mol. Thus, the overall enthalpy of formation for potassium chloride is -4395 kJ/mol.

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Answer:

Since it has 2 valence electrons

Explanation:

The three step for the synthesis of 3-bromocyclopentene are: bromination, reaction with tert-butoxide and at last reaction with ester.

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The bond with the greatest degree of ionic character is the bond between H and CI (option B).

To determine the bond with the greatest degree of ionic character, we need to compare the electronegativities of the atoms involved in each bond. The greater the difference in electronegativity, the more polar or ionic the bond will be.

Among the given options, the bond between H and CI is expected to have the greatest degree of ionic character. The electronegativity of hydrogen (H) is 2.1, and the electronegativity of chlorine (CI) is 3.0. The difference in electronegativity is 3.0 - 2.1 = 0.9.

Comparing this with the other options:

The electronegativity difference between H and C is 2.5 - 2.1 = 0.4.

The electronegativity difference between C and CI is 3.0 - 2.5 = 0.5.

The electronegativity difference between H and Br is 2.8 - 2.1 = 0.7.

The electronegativity difference between Br and CI is 3.0 - 2.8 = 0.2.

Based on these comparisons, the bond with the greatest degree of ionic character is the bond between H and CI (option B).

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ANSWER

The initial volume of the acid is 260mL

EXPLANATION

Given that;

The final volume of the ethanoic acid is 4.5L

The final concentration of the ethanoic acid is 1.0 mol/L

The initial concentration of the ethanoic acid is 17.4 mol/L

Follow the steps below to find the volume of the ethanoic acid

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the formula

Therefore, the initial volume of the acid is 260mL

Answer:

Answer is C,

Explanation:

It diminished local resources, decreasing the population.

Answer:

X

Explanation:

because it is the greatest

the drug concentration will not stabilize in the patient's bloodstream and will continue to increase indefinitely, which could have adverse effects on the patient.

The given drug concentration formula is C(t) = 0.2t + 2 + 1 mg/cm². To find lim C(t), we need to evaluate the limit as t approaches infinity. As t increases without bound, the 0.2t term dominates the equation, making the other two terms negligible. Therefore, lim C(t) = infinity. This means that the drug concentration in the patient's bloodstream will continue to increase indefinitely, which can be a cause for concern if the drug is not properly metabolized or excreted from the body. It is important for healthcare professionals to monitor drug concentrations in patients to avoid toxicity or adverse effects. To find the limit as t approaches infinity, lim C(t), we can analyze the function. As t increases, the 0.2t term will dominate the constant term, 2. Therefore, the concentration of the drug in the bloodstream will keep increasing without bounds as time goes on. Mathematically, lim (t→∞) C(t) = ∞. This result indicates that the drug concentration will not stabilize in the patient's bloodstream and will continue to increase indefinitely, which could have adverse effects on the patient.

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Answer:

he was born on planet krypton

The potential energy diagram for the reaction N02(0) -> JN2(9) + 02(9) should be a curve that descends from reactants to intermediates and then ascends to products, with a label indicating that ΔH = -33.1 kJ/mol.

A potential energy diagram of a reaction is a graph that demonstrates the progress of a reaction and the changes in potential energy that occur over time. The vertical axis of the diagram shows potential energy, and the horizontal axis shows reaction progress. Reactants are shown on the left, intermediates are shown in the middle, and products are shown on the right. The reaction pathway is depicted with a curve that descends from reactants to intermediates and then ascends to products. Labeling the enthalpy of a reaction involves identifying its enthalpy change. The enthalpy change (ΔH) of a reaction is the heat absorbed or given off by the system at a constant pressure. The reaction N02(0) -> JN2(9) + 02(9) has ΔH = -33.1 kJ/mol. The reaction is exothermic because the enthalpy change is negative.

The potential energy diagram for this reaction should be a curve that descends from reactants to intermediates and then ascends to products. The enthalpy change should be labelled in the diagram. If the enthalpy change is negative, then it should be labelled as a negative value. If the enthalpy change is positive, then it should be labelled as a positive value.

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Answer:

hi 7676

jkjk jj

67 jyrf

876

Answer:

miss you baby talk tm

Explanation:

Answer:

Part 1: 229.95g

Part 2: 598.5g

Part 3: 12.6g

Explanation:

Note: I learned this last week. Answer not sure.

Pls tell me if i got it right or wrong.

Mg + HCl - > MgCl2 + H2

First, balance the equation.

There is only 1 H and 1 Cl at the left side. BUT there are 2 Cl and 2 H at the right side. So you can add a 2 in front of HCl to balance it.

Mg + 2HCl - > MgCl2 + H2

Formula 1: (n= m/mr)

n = moles, m= mass, mr = molecular mass

Formula 2: (n= v/24)

v = volume

Part 1

What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?

Ratio of

(look at the number in front of each)

2HCl : Mg

2 : 1

(3.15 x 2) : 3.15 moles

6.3 moles : 3.15 moles

So 2HCl has 6. 3 moles

Now use formula 1 (n = m/mr)

Calculate molecular mass of HCl

Check your periodic table

mr of HCl =(1 + 35.5) = 36.5

6.3 = m/36.5

m = 229. 95grams

Part 2

What mass of MgCl2 is produced? Answer in units of g.

Ratio of

2HCl : MgCl2

(1 +35.5) : (24+35.5x2)

36.5: 95

229.95g :?

229.95g : 598.5g

m = 598.5g

Part 3

What mass of H2 is produced? Answer in units of g.

2HCl : H2

36.5 : 2

229.95g :?

229.95g : 12.6g

m = 12.6g

Answer:

In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. In liquids, particles are quite close together and move with random motion throughout the container.

Explanation:

I hope this helps you.

Have a good day!

Answer:

co2

Explanation:

it is an ionic compound

Answer:

70..... I think

Explanation:

Cuz if the bus travels 35 km every 30 mins this means that it travels 70 km per hour

Answer:

The lanthanides

Explanation:

The lanthanides and actinides section of the periodic table is known as the f block, and they usually are all metals and are similar in reactivity to the Group 2 (the alkaline earth metals)

Answer:

b

Explanation:

Answer:

Plumbing System

Explanation:

Answer:

C plumbing system

Explanation:

Infrastructure is the basic structures needed for the operation of society

The value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm. To calculate Kp for the reaction N2O4(g) ⇌ 2NO2(g) using the given Kc value, we need to consider the relationship between Kp and Kc.

Kp is the equilibrium constant expressed in terms of partial pressures, while Kc is the equilibrium constant expressed in terms of concentrations. The relationship between them is Kp = Kc(RT)^Δn, where R is the gas constant, T is the temperature in Kelvin, and Δn represents the difference in the number of moles of gaseous products and reactants.

For the reaction N2O4(g) ⇌ 2NO2(g), the stoichiometric coefficients indicate that the change in the number of moles of gas is Δn = (2 - 1) = 1. Given the value of Kc as 5.9x10^-3, we can now calculate Kp. The value of R is 0.0821 L·atm/(mol·K), and let's assume the temperature is 298 K. Plugging in these values into the equation, we have Kp = (5.9x10^-3)(0.0821 L·atm/(mol·K))(298 K)^1 = 1.47x10^-3 atm.

Therefore, the value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm.

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The amount of heat that must be carried away by the cooling system is -2130 J.

The correct answer is option d.

To solve this problem, we need to use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system.

In this case, we are given that the internal energy changes by -2767 Joules and the work done by the engine is 637 Joules. Therefore, we can calculate the heat that must be carried away by the cooling system as follows:

ΔU = Q - W
-2767 J = Q - 637 J
Q = -2767 J + 637 J
Q = -2130 J

Therefore, -2130 J is the amount of heat that must be carried away by the cooling system (answer choice d).

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The amount of heat that must be carried away by the cooling system is 2130 J, which is answer choice B.

The first law of thermodynamics states that the change in internal energy (ΔU) of a system is equal to the heat (Q) added to the system minus the work (W) done by the system. Mathematically, this can be written as ΔU = Q - W.

A complicated device called an automotive engine transforms the chemical energy in fuel into mechanical energy to propel the car. In order to move the vehicle forward, the engine normally comprises of a number of parts, including cylinders, pistons, valves, and a crankshaft.

In this case, we know that the ΔU is -2767 J and the W is 637 J (since the engine provided this much work to push the pistons). Therefore, we can rearrange the equation to solve for Q:

Q = ΔU + W
Q = (-2767 J) + (637 J)
Q = -2130 J

So the amount of heat that must be carried away by the cooling system is 2130 J, which is answer choice B.

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In picture one, there are four electrons, one valance electrons and two shells, in image two there are three electrons, one valance electrons and two shells whereas there are 13 electrons, three valance electrons and three shells.

Electrons:

An electron is a negatively charged particle which can be either bounded with to an atom. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure.

Valence Electrons:

Valence electrons are those electrons which are present in outermost shell or in valence shell or energy level of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Electron Shells Numbers:

Each shell can contain only a fixed number of electrons: the first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

So we can conclude that In picture one, there are four electrons, one valance electrons and two shells, in image two there are three electrons, one valance electrons and two shells whereas there are 13 electrons, three valance electrons and three shells.

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Answer:

b. biosphere

do to the plant being a plant it is in the biosphere

Answer:

Thermal energy

Explanation:

Sorry it took me forever

Answer:

Thermal energy

Explanation:

Answer:

We use the following formula as given below Use the formula below to find the lone pair on the oxygen atom of the SO3 molecule. L.P (O) = V.E (O) – N.A (S-O) Lone pair on the terminal oxygen atom in SO3 = L.P (O)

Explanation:

Answer:

0.67atm is the new pressure of the gas

Explanation:

To find one condition of a gas when pressure, volume and absolute temperature change we must use combined gas law:

\(\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}\)

Where P is pressure, V is volume and T is absolute temperature of 1, initial state and 2, final state of the gas.

Replacing:

P₁ = 1.12atm

V₁ = 156mL

T₁ = 28.1°C + 273.15K = 301.25K

P₂ = ?

V₂ = 312mL

T₂ = 87.2°C + 273.15 = 360.35K

1.12atm*156mL / 301.25K = P₂*312mL / 360.35K

P₂ = 0.67atm is the new pressure of the gas

Answer:

I think I know what you're supposed to do here. You're supposed to fill out the blanks using at least one given answer. For example, on number 15, you should be able to find out the ions and the formula using the names of the substances. On number one, you should be able to figure out the formula and the names using the ions given.

Explanation:

Given above.

The molar ratio of iron (Fe) and oxygen gas (O2) is 4:3 as shown by the equilibrium equation:

\(4 Fe + 3 O_2---- > 2 Fe_2O_3.\)

We can use the provided amount and molar ratio of iron(III) oxide (Fe2O3) moles to calculate how many moles of oxygen gas are needed to react with iron metal.

Given: Moles of Fe2O3 = 4.89 mol

We can construct the following ratio using the molar ratio from the balanced equation:

4 mol Fe / 3 mol O2 = 4.89 mol Fe2O3 / x mol O2

Cross-multiplying and solving for x, we get:

4 mol Fe * x mol O2 = 3 mol O2 * 4.89 mol Fe2O3

4x = 12.33

x = 12.33 / 4

x ≈ 3.08 mol \(O_2\)

Therefore, approximately 3.08 moles of oxygen gas are required to react with iron metal to produce 4.89 moles of iron(III) oxide.

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NH₃ is expected to have a dipole moment as it has electronegativity difference between nitrogen and hydrogen, making it the most polar molecule.

Dipole moment is the measure of the polarity of a molecule, which is determined by the magnitude and direction of the separation of the molecule's charges. The dipole moment depends on the electronegativity and molecular geometry of the molecule.

NH₃ has a trigonal pyramidal shape, with a lone pair of electrons on nitrogen, causing a greater distribution of the negative charge towards the nitrogen atom.

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