Which of the following is an example of a diatomic molecule?

2H

O2

CH4

H2O​

Answer:

Before we can sketch the Lewis structures of molecules, we must first understand the octet rule. The octet rule asserts that when atoms combine to create compounds, electrons are gained, lost, or shared among them, resulting in a stable electron configuration defined by eight valence electrons as a result. These rules are used in conjunction with the main-group components of the second period.

Explanation:

Hope it helps:)

Statement C is not true. A combination reaction is not called retrosynthesis.

Retrosynthesis is a term used in organic chemistry to describe the process of planning the synthesis of a complex molecule by breaking it down into simpler precursor compounds. On the other hand, a combination reaction refers to a chemical reaction where two or more substances combine to form a single compound.

Examples of combination reactions include the reactions mentioned in statements A and D, where magnesium reacts with oxygen to form magnesium oxide and sodium reacts with chlorine to form sodium chloride, respectively.

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The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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The standard notation of the number 5.693 x 10⁹ is 5693000000.

The standard notation of a number is an expression of a number which is written with only number digits.

The standard notation as against scientific notation is not written with powers of ten.

The standard notation of the number 5.693 x 10⁹ is given as follows:

5.693 x 10⁹ = 5.693 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10

5.693 x 10⁹ = 5.693 x 1000000000

5.693 x 10⁹ = 5693000000

In conclusion, standard notation of a number expresses the number with only number digits.

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This is challenging to provide an exact prediction for the melting and boiling points. Experimental factors, impurities, and other variables can influence these values.

To predict the melting and boiling points for methylamine (CH3NH2), we can consider the differences in molecular structure and intermolecular forces compared to ethane. Methylamine has a nitrogen atom in place of one carbon atom in ethane.

Methylamine exhibits hydrogen bonding due to the presence of the nitrogen atom, which can form hydrogen bonds with other methylamine molecules. Ethane, on the other hand, lacks a hydrogen atom bonded to an electronegative atom, so it does not participate in hydrogen bonding.

Hydrogen bonding is stronger than the London dispersion forces present in ethane. Consequently, methylamine is expected to have stronger intermolecular forces and thus higher melting and boiling points compared to ethane.

Considering this, we can predict that the melting point of methylamine will be higher than -183 °C, the melting point of ethane. Similarly, the boiling point of methylamine will be higher than -89 °C, the boiling point of ethane.

However, without specific experimental data or a detailed analysis of methylamine's properties.

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The gas particles move faster than the liquid particles, and the bonds of the molecules are broken during evaporation to allow gas atoms to spread apart.

When substances evaporate from liquid states to gaseous states, the bonds between the molecules of the substances are broken and the atoms spread apart as far away as possible.

In addition to the breaking of bonds, the particles of the gases move faster than when they were linked together in liquids since the particles are now free from one another.

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There will be 0.4589 mL of ethyl acetate left in the space after evaporation.

The conversion of a liquid substance into a gas is known as evaporation. As a result of the liquid absorbing energy from its surroundings, molecules begin to travel faster and faster until they finally become a vapour and escape into the environment. Usually, the energy is absorbed as heat, but it can also be in the form of light or electricity.

No, the ethyl acetate won't all evaporate. The amount of ethyl acetate that will stay in the space after evaporation can be determined using the ideal gas law. As per the ideal gas law, PV = nRT

P is the overall system pressure, V is the room's volume, n is the amount of ethyl acetate in moles, R is the ideal gas constant, and T is the temperature.

To solve for n, the quantity of moles of ethyl acetate, we can rearrange the equation as follows: n = PV/RT

When the values are plugged in, we get:

n = (94.9 torr)(7.25 m x 2.75 m x 2.75 m)/(8.314 J/K mol)(298 K)

\(n = 4.666 \times 10^{-3} mol\)

The molar mass of ethyl acetate (88.11 g/mol) can then be used to compute the mass of ethyl acetate:

Mass = \(n \times M = (4.666 x 10^{-3} mol)(88.11 g/mol)\) = 0.4125 g

Using the density of ethyl acetate (0.901 g/mL), it is possible to determine the volume of the liquid that is still present:

Volume = mass/density = (0.4125 g)/(0.901 g/mL) = 0.4589 mL

As a result, there will be 0.4589 mL of ethyl acetate left in the space after evaporation.

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a)CH3-CH2-CH2-CH=CH2

b)CH3-CH2-CH2-CH2-CH2-CH2-CH3

c)CH≡C-CH2-CH2-CH2-CH3

d)CH3-CH2-CH2-CH2-CH2-CH2-CH=CH2

e)CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3

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The current passing through the inductor is 3.8 A. The correct option is D. 3.8 A

From the question, we are to determine the current passing through the inductor.

From the formula, for the energy stored in a magnetic field

E = 1/2LI²

Where E is the energy

L is the inductance

and I is the current

From the given information,

E = 3.6 J

L = 0.50 H

Putting the parameters into the formula, we get

3.6 = 1/2 × 0.50 × I²

3.6 = 0.25 × I²

I² = 3.6 ÷ 0.25

I² = 14.4

I = √14.4

I = 3.7947

I ≅ 3.8 A

Hence, the current passing through the inductor is 3.8 A. The correct option is D. 3.8 A

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Answer:

carbon and hydrogen

Explanation:

the carbon atoms join together to form the frame work of the compound and the hydrogen atoms attach to them in many different configurations

One liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is hydrochloric acid (HCl). Hydrochloric acid is a strong acid commonly used in laboratories for various purposes, including cleaning and dissolving mineral deposits.

When dry mortar, which is primarily composed of cement, hardens on floor tiles, it can be challenging to remove using traditional cleaning methods. However, hydrochloric acid can effectively dissolve and break down the cementitious components of the mortar.

It is important to note that when using hydrochloric acid, proper safety precautions should be followed, such as wearing protective gloves, goggles, and working in a well-ventilated area.

Additionally, it is crucial to dilute the hydrochloric acid to an appropriate concentration for the specific task, as using it undiluted can cause damage to the tiles or other surfaces.

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Answer:

1. Solid

2. Particles.

3. Space.

Explanation:

1. The particles in a solid are packed very closely together. This is the most reason why solid particles have definite shapes of volume. This closeness is as a result of strong intermolecular forces force that exist between the particles. Hence, they can not flow but only vibrates about their mean position. Solids can not be compressed because of the strong intermolecular forces between their particles.

2. The particles of liquid are loosely together. In liquid, the particles are loosely packed and free to move about to certain degree. This is so because the intermolecular force between the particles are not as strong as those within the solid particles. Hence liquid has no definite shape but they have definite volume. They only assume the shape of the container they are poured into. Liquid can no be compressed..

3. In a gas, the space between the particles are bigger. This is so because the intermolecular forces between the particles are negligible i.e very small and so, the gas particles are free to move about and only restricted by the wall of the container they poured into. This negligible intermolecular forces are the reason why gas has no definite shapes and no volume. They can be compressed to fill a particular container.

Answer:

the pasta will soften

Explanation:

the pasta will boil and will soften up as a result of it being regular pasta

Explanation:

Since the ratio is Cu/Fe, if some Fe were lost due to spillage, the Cu/Fe ratio would INCREASE because Fe would be lower.

If some iron or copper got spilt from the vessel, then their mole ratio gets reduced with the second reactant. If the iron fillings were not completely pure, thein the impurities also weigh for the whole.

The mole ratio of elements in a compound is the ratio between the number of moles of elements. The mole ratio might changes with the reaction conditions, presence of impurities and personal errors during the weight measurement.

a. If the iron had spilt after it is weighed, then, the mole ratio of iron gets reduced. c. The same happens for copper if copper spilt away.

b. If the iron fillings are not completely pure, the weight of impurities also contributes to the total weight and thus, the mole ratio we calculated will be higher than the original.

d. If the copper was not completely dry, the some moisture will contribute to its weight and the calculated mole ratio will increase for copper.

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Answer:

B.) 6

Explanation:

Attached below is the Lewis structure of PCl₃ . Since phosphorus (P) has 5 valence electrons and chlorine (Cl) has 7 valence electrons, there should be 26 valence electrons (5 + 7(3) = 26) in the Lewis structure.

Bonding electrons are the electrons present in the chemical bonds between two atoms.

There are 2 electrons shared in every single bond. Within PCl₃, there are 3 single bonds. As such, there are 6 bonding electrons in the Lewis structure of PCl₃.

The ratio of neutrons to protons, or the N/Z ratio, plays a crucial role in determining a nucleus' stability. The range of N/Z ratios in which nuclei are stable is generally referred to as the belt of stability.

If the forces between the constituents of the nucleus are equal, an atom is stable. If these forces are out of balance or if the nucleus has an excessive amount of internal energy, an atom is unstable (radioactive).

Z = 104 for Rutherfordium, element 104. The isotopes 261Rf and 262Rf, having masses of 261 and 262, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

261Rf: N/Z = (261-104)/157 = 1.08

262Rf: N/Z = (262-104)/158 = 1.09

These N/Z ratios are a little bit higher than the average belt of stability values, which are about 1.0 for heavy nuclei. These isotopes are thought to be reasonably stable because they are close enough.

Z = 109 for Meitnerium, element 109. The isotopes 278Mt and 282Mt, with masses of 278 and 282, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

278Mt: N/Z

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The order of reaction is defined as the power to which the concentration of the reactants are raised in the rate equation of the reaction.

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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

C. Dissecting microscope

Explanation:

It is trying to see the surface

The percent composition of hydrogen and oxygen are 11.2% and 88.8% respectively and the number of moles of hydrogen and oxygen are 1.34 moles and 0.66 moles respectively.

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100.

Here, the quantity is measured in terms of grams of the elements present.

The significance of this composition calculation is found in the chemical analysis.

Given,

Mass of hydrogen = 2.688g

Mass of oxygen = 21.32g

Total mass = 2.688 + 21.32 =  24.008g

Percent composition = (Mass of the substance / Total mass) × 100

Percent composition of hydrogen = ( 2.688 / 24.008) × 100

                                                        = 11.2%

Percent composition of oxygen  = ( 21.32 / 24.008) × 100

                                                          = 88.8%

Number of moles of hydrogen = 2.688 / 2 = 1.34 moles

Number of moles of oxygen = 21.32 / 32 = 0.66 moles

Therefore, the percent composition of hydrogen and oxygen are 11.2% and 88.8% respectively and the number of moles of hydrogen and oxygen are 1.34 moles and 0.66 moles respectively.

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Answer:

319.2 g of iron metal

Explanation:

We'll begin by writing the balanced equation for the reaction between iron (Fe) and oxygen (O₂) to produce ferric oxide (Fe₂O₃). This is illustrated below:

4Fe + 3O₂ —> 2Fe₂O₃

Next, we shall determine the mass of Fe that reacted and the mass of Fe₂O₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of Fe = 56 g/mol

Mass of Fe from the balanced equation = 4 × 56 = 224 g

Molar mass of Fe₂O₃ = (56×2) + (16×3)

= 112 + 48

= 160 g/mol

Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g

SUMMARY:

From the balanced equation above,

224 g of Fe reacted to produce 320 g of Fe₂O₃.

Finally, we shall determine the mass of iron metal, Fe, required to produce 456 g of ferric oxide, Fe₂O₃. This can be obtained as follow:

From the balanced equation above,

224 g of Fe reacted to produce 320 g of Fe₂O₃.

Therefore, Xg of Fe will react to produce 456 g of Fe₂O₃ i.e

Xg of Fe = (224 × 456)/320

Xg of Fe = 319.2 g

Thus, 319.2 g of iron metal, Fe is required to produce 456 g of ferric oxide, Fe₂O₃.

From the calculation that we have here, the entropy of the system is obtained as 71.9 J/K.

Entropy is a thermodynamic quantity that is a measure of the degree of randomness or disorder in a system. In other words, it is a measure of the number of possible ways that the energy of a system can be distributed, or the number of possible arrangements that the system can have.

We know that;

ΔS = ΔH/T

ΔS = 69 * 10^3/959

ΔS = 71.9 J/K

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The concentration of H₂SO₃ solution is equal to 0.123 M.

A neutralization reaction is described as a reaction in which an acid and base react to form salt and water. When a strong acid will react with a base then the salt which is formed can be neither acidic nor basic.

When H₂SO₃ (a strong acid) reacts with KOH, the resulting salt is K₂SO₃  and water.

H₂SO₃  +  2KOH   →   K₂SO₃  +   2H₂O

Given, the concentration of KOH = 0.235 M

The volume of the KOH = 65.25 ml = 0.06525 L

The number of moles of KOH, n = M × V = 0.235 × 0.06525 = 0.0153 M

The volume of the  H₂SO₃ = 62.4 ml = 0.0624 L

The number of moles of  H₂SO₃, n = 0.0153/2 = 0.00767 mol

The concentration of H₂SO₃ =0.00767/0.0624 = 0.123 M

Therefore, the molarity of  H₂SO₃ is 0.123 M.

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Explanation:

it can suddenly increase when more and more people have babies and the infant rate goes up. and how it might affect the ecosystem is the pollution that people give off.

Answer:

Explanation:

Due to less predators in the Savannah/habitat, the population could unexpectedly grow. This will have an impact on the environment because it will give rise to more prey as there will be fewer predators. If too many herbivores are present on one feeding site, competition for food will occur. If there are more plants in an area than normal, it can increase the population of animals that consume the plant. If the population of one animal rises, the population of animals that consume that animal could also rise.

Population growth isn't always good. A population may often grow too big to sustain the climate. Other modifications in limiting variables can cause a population to decline. The population will decrease if a population becomes diseased, and the population of animals that consume the diseased animals will decrease as well. Populations in nature typically balance themselves. Sometimes, they can't always restore a natural balance as man affects populations.

Answer:

\(T_F=44.0\°C\)

Explanation:

Hello!

In this case, since this calorimetry problem is about the mixing of two volumes of water, we can infer that the heat lost by the hot water is gained by the cold water so we can write:

\(Q_{W,hot}=-Q_{W,cold}\)

Which in terms of mass, specific heat and temperature change is:

\(m_{W,hot}C_{W,hot}(T_F-T_{W,hot})=-m_{W,cold}C_{W,cold}(T_F-T_{W,cold})\)

Clearly, the specific heat is the same for both waters and the masses, considering the given densities are:

\(m_{W,cold}=0.341m^3*\frac{1000kg}{1m^3} =341kg\\\\m_{W,hot}=0.127m^3*\frac{1000kg}{1m^3} =127kg\\\)

Thus, we can solve for the the final temperature as shown below:

\(T_F=\frac{m_{W,hot}T_{W,hot}+m_{W,cold}T_{W,cold}}{m_{W,hot}+m_{W,cold}}\)

And by plugging in the values we obtain:

\(T_F=\frac{341kg*25.0\°C+127kg*95.0\°C}{341kg+127kg}\\\\T_F=44.0\°C\)

Best regards!

The final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.

The given parameters;

The mass of the cold water and the hot water are calculated as follows;

\(mass = density \times volume\\\\m_{cold} = 1000 \times 0.341 = 341 \ kg\\\\m_{hot} = 1000 \times 0.127 = 127 \ kg\)

Apply the principle of conservation of energy to determine the final temperature of the mixture;

heat lost by the hot water = heat absorbed by the cold water

\(341 \times 4200 \times (t - 25) = 127 \times 4200 \times (95 - t)\)

where;

\(341(t- 25) = 127(95-t)\\\\341t - 8525 =12065 - 127t\\\\468t = 20590\\\\t = \frac{20590}{468} \\\\t = 44 \ ^0C\)

Thus, the final temperature of the mixture of hot and cold water at the given masses is 44 ⁰C.

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Answer:

ΔH = -470.4kJ

Explanation:

It is possible to sum 2 or more reactions to obtain the ΔH of the reaction you want to study (Hess's law). Using the reactions:

1. CaC2(s) + 2H2O(l) → C2H2(g) + Ca(OH)2(s)ΔH = −414kJ

2. 6C2H2(g) + 3CO2(g) + 4H2O(g) → 5CH2CHCO2H(g)ΔH = 132kJ

6 times the reaction 1.

6CaC2(s) + 12H2O(l) → 6C2H2(g) + 6Ca(OH)2(s)ΔH = −414kJ*6 = -2484kJ

This reaction + 2:

6CaC2(s) + 3CO2(g) + 16H2O(l) →  + 6Ca(OH)2(s) + 5CH2CHCO2H(g) ΔH = -2484kJ + 132kJ = -2352kJ

As we want to calculate the net change enthalpy in the formation of just 1 mole of acrylic acid we need to divide this last reaction in 5:

6/5CaC2(s) + 3/5CO2(g) + 16/5H2O(l) →  + 6/5Ca(OH)2(s) + CH2CHCO2H(g) ΔH = -2352kJ / 5

Answer:

13.6 m

Explanation:

To find the wavelength, you need to use the following equation:

c = λ · f

In this equation,

-----> c = speed of light (3.0 x 10⁸ m/s)

-----> λ = wavelength (m)

-----> f = frequency (Hz)

You can plug the given values (speed of light and frequency) into the equation and then solve for "λ".

c = λ · f                                                        <----- Equation

(3.0 x 10⁸ m/s) = λ · (2.20 x 10⁷ Hz)           <----- Insert values

13.6 = λ                                                      <----- Divide both sides by 2.20 x 10⁷

Answer:

5.83g C4H10 x (1 mol C4H10/58.05 g (molar mass of C4H10) x (10 mol H2O/ 2 mol C4H10) x (18.002 g H2O (molar mass of H2O)/ 1 mol H2O=

Answer: 9.04 g of H2O

Explanation:

First set up equation: C4H10 (g)+ O2(g) -> CO2(g) + H2O(g)

Next balance it: 2C4H10 (g)+ 13O2(g) -> 8CO2(g) + 10H2O (g)

Use equation to get moles and plug given

5.83g C4H10 x (1 mol C4H10/58.05 g (molar mass of C4H10) x (10 mol H2O/ 2 mol C4H10) x (18.002 g H2O (molar mass of H2O)/ 1 mol H2O