what is magnetism? please answer

Answer:

c is the answer

step by step explanation is not

The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

Hence, option D is correct answer.

A double covalent bond is a type of covalent bond which involves the sharing of two pairs of electrons.

A covalent bond is a type of chemical bond that involves the sharing of electron pairs between the atoms.

Now lets check all options one by one

Option (A): CH₃Cl

In CH₃Cl carbon has 4 valence electrons and carbon shares its 1 electron each with three hydrogen atoms and carbon shares its 1 electron with chlorine. Here bonds are formed due to sharing of electrons between the atoms. Hence CH₃Cl is covalent bonded.

So, it is incorrect option.

Option (B): C₂H₃Cl

In  C₂H₃Cl, here two carbon atoms form double bond but they not form covalent bond.

So it is incorrect option.

Option (C): C₂H₂

In C₂H₂, each carbon has 4 valence electrons and each carbon shares its   one electron with each hydrogen atom here two carbon atoms are triple bonded.

So, it is incorrect option.

Option (D): C₂H₄

In C₂H₄, there are two carbon atoms and two hydrogen atoms, here two carbon atoms are double bonded.

So, it is correct option.

Thus, from above conclusion we can say that The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

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Explanation:

The nitrate ion is a radical with an overall charge of -1. To get the oxidation number of lead add up all the oxidation numbers and equate to zero. Where x= O.N of lead. Therefore the oxidation state of lead is +2.

The half-life of the reaction A→B is 10.0 s. This is determined from the data provided in the question. At time 0.0 s, the concentration of A is 1.7 M. After 10.0 s, the concentration of A is 0.43 M, which is approximately half of the initial concentration.

Therefore, the half-life of this reaction is 10.0 s. The other options (0.97 s, 7.1 s, 3.0 s, 5.0 s, and 0.14 s) are not correct based on the data provided.  

For a first-order reaction, the rate of the reaction is proportional to the concentration of the reactant raised to the power of one (i.e., rate = k[A]). The half-life of a first-order reaction is independent of the initial concentration of the reactant and is given by the equation:

t(1/2) = ln(2) / k

where k is the rate constant of the reaction.

To determine the rate constant, we can use the given data and the first-order rate equation. The rate constant k can be calculated from the rate constant expression:

k = (ln[A]₀ - ln[A]t) / t

where [A]₀ is the initial concentration of A, [A]t is the concentration of A at time t, and t is the time elapsed.

Using the given data, we can calculate the rate constant for the reaction using the first two data points:

k = (ln[A]₀ - ln[A]t) / t

k = (ln(1.7) - ln(0.43)) / 10.0 s

k = 0.336 s^(-1)

Substituting the value of k into the half-life equation, we get:

t(1/2) = ln(2) / k

t(1/2) = ln(2) / 0.336 s^(-1)

t(1/2) = 2.06 s

Therefore, the half-life of the reaction is 2.06 s. The answer closest to this value is 3.0 s, which is approximately 1.5 times the correct value. None of the other provided answer choices is close to the correct value.

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The work would become four times if the spring is stretched twice , as the work done while stretching a spring is proportional to the force times the distance therefore the correct answer is option C.

The spring constant is used to define the stiffness of the spring, the greater the value of the spring constant stiffer the spring, and it is more difficult to stretch the spring.

Since the work involved in extending a spring is proportional to the force times the distance, option C is the right response. If the spring is stretched twice, the effort would increase by a factor of four.

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Answer:

X : 68 F

Y : 72 F

Explanation:

pls mark brainliest

Answer:

I think A

Explanation:

When 52.0140 grams is added to 50.71 grams, the result is 102.72 grams.

When adding or subtracting numbers, it is important to consider the number of decimal places or significant figures in each value to determine the appropriate number of decimal places in the result.

In this case, we have 52.014 grams and 50.71 grams. Since the number 50.71 grams has the fewest decimal places (two decimal places), we need to round the result to two decimal places.

Adding 52.0140 grams to 50.71 grams gives us a result of 102.7240 grams. However, since we need to round to two decimal places, the final result is 102.72 grams.

Therefore, reported to the correct number of significant figures, the result when 52.0140 grams is added to 50.71 grams is 102.72 grams.

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Answer:

Virtually every industry in the world anticipates sweeping systemic transformation over the next decade in their strategic planning, production practices, and business models, according to the Sustainability Survey Poll on Water. The global opinion poll, which released a survey of more than 1,200 sustainability experts in March, concludes that water shortages will shift public perception of the value of water, prompting governments and companies to view clean water not as a commodity to exploit but as a precious resource.Conducted by GlobeScan, an international public and stakeholder opinion research firm, and SustainAbility, a think tank and business strategy consultancy, the poll asked, “What are the technologies or changes in behavior which show the most promise for addressing water shortages over the next 10 years?” The experts’ responses generated 19 consensus solutions.

Explanation:

Answer:

because it does not cost much and can be found easily.  due to their low resistance and excellent conductivity.

Explanation:

The fact that the amount of sunlight should vary every day is the missing factor.

It goes without saying that Katherine wants to find out if the time of day a plant is watered impacts its growth. She waters various plant species with the same quantity of water at various intervals throughout the day. The plants receive the same amount of sunshine and are situated in the same spot.

Plants should be watered at various times of the day, an independent variable.

Controlled variable; identical plant species should be used in the experiment

Sunlight intensity is a dependent variable that should fluctuate everyday.

Controlled variable; identical water volume should be used in the experiment

From above we can conclude that missing variable is that the amount of sunlight should change daily.

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Answer:

HHAHAHDSHBDBFHFBJDKFHDFJGKFGJDFGHFHIUGHFDDFNDLS

Explanation:

Answer:It’s cyclone movement

Explanation:

Answer:

1. organic

2. plants

3. algae?

4. oxygen

5. Uses

In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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The given electron configuration belongs to the element fluorine (F).

If an atom of fluorine approaches an atom with one valence electron (such as an alkali metal atom), a bond can form. Fluorine has seven valence electrons, and it requires one more electron to complete its octet (i.e., eight valence electrons) and achieve a stable electron configuration.

Therefore, fluorine will tend to gain one electron from the atom with one valence electron, forming a stable ionic compound. Alternatively, fluorine could share one electron with the atom with one valence electron, forming a covalent bond, but this is less likely due to the large difference in electronegativity between fluorine and alkali metals.

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When comparing two hydrocarbons, the larger, higher molecular weight molecule would have a higher melting point due to greater amounts of dispersion forces.

Hydrocarbons are organic compounds made up of only carbon and hydrogen. They are non-polar molecules; therefore, they do not have partial charges or hydrogen bonds. The only form of intermolecular attraction between them are dispersion forces.

Dispersion forces are the weakest type of intermolecular forces. They exist in non-polar molecules and gases like neon, hydrogen gas and oxygen gas. It is formed by the attraction between electrons and the nucleus.

Hydrocarbons with higher molecular weights have more electrons surface area than hydrocarbons with lower molecular weights. This causes the dispersion forces between the molecules to increase, thereby causing an increase in boiling point.

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Answer:

To find the mass of a 19.6 ml solution of 18.0 wt% cacl2, we can use the density of the solution and the volume.

First, we need to convert the percentage concentration to a mass fraction. We can do this by multiplying the percentage by the mass of one mole of cacl2 (110.98 g/mol) and then dividing by 100.

mass fraction = (18.0 wt%) * (110.98 g/mol) / 100 = 19.79 g/100g

Next, we can use the density of the solution to find the mass of 19.6 ml of the solution:

mass = density * volume = 1.165 g/ml * 19.6 ml = 22.904 g

Now, we can convert the mass to milligrams by multiplying by 1000

mass (milligrams) = 22.904 g * 1000 = 22904 mg

So, the mass of a 19.6 ml solution of 18.0 wt% cacl2 is 22904 mg

Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

All isotopes of an element have the same number of protons and have the same atomic number. Thus, the options B and C are correctly applied to complete the statement.

Isotopes are the atoms with same atomic number but different mass numbers. Atomic numbers are the numbers of electrons and protons in the atom. Since the atomic number is the same, the number of electrons and protons is the same in isotopes.

The mass number refers to the mass of the atom and it is equal to the sum of the number of protons and neutrons in an atom. Since the proton number is equal and the mass number is different, the number of neutrons in the atom is different.

Isotopes differ in physical properties due to different numbers of neutrons but have similar chemical properties due to the same number of electrons in the atom.

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Answer:

B. Have the same number of protons.

C. Have the same atomic number.

Explanation:

trustttt

Answer:

Natural gas is an odorless, gaseous mixture of hydrocarbons—predominantly made up of methane (CH4). It accounts for about 30% of the energy used in the United States. About 40% of the fuel goes to electric power production and the remaining is split between residential and commercial uses, such as heating and cooking, and industrial uses. Although natural gas is a proven, reliable alternative fuel that has long been used to power natural gas vehicles, only about two-tenths of 1% is used for transportation fuel.

The vast majority of natural gas in the United States is considered a fossil fuel because it is made from sources formed over millions of years by the action of heat and pressure on organic materials. Alternatively, renewable natural gas (RNG), also known as biomethane, is a pipeline-quality vehicle fuel produced from organic materials—such as waste from landfills and livestock—through anaerobic digestion. RNG qualifies as an advanced biofuel under the Renewable Fuel Standard.

Because RNG is chemically identical to fossil-derived conventional natural gas, it can use the existing natural gas distribution system and must be compressed or liquefied for use in vehicles.

CNG and LNG as Alternative Transportation Fuels

Two forms of natural gas are currently used in vehicles: compressed natural gas (CNG) and liquefied natural gas (LNG). Both are domestically produced, relatively low priced, and commercially available. Considered alternative fuels under the Energy Policy Act of 1992, CNG and LNG are sold in units of gasoline or diesel gallon equivalents (GGEs or DGEs) based on the energy content of a gallon of gasoline or diesel fuel.

Compressed Natural Gas

CNG is produced by compressing natural gas to less than 1% of its volume at standard atmospheric pressure. To provide adequate driving range, CNG is stored onboard a vehicle in a compressed gaseous state at a pressure of up to 3,600 pounds per square inch.

CNG is used in light-, medium-, and heavy-duty applications. A CNG-powered vehicle gets about the same fuel economy as a conventional gasoline vehicle on a GGE basis. One GGE equals about 5.66 pounds of CNG.

Liquefied Natural Gas

LNG is natural gas in its liquid form. LNG is produced by purifying natural gas and super-cooling it to -260°F to turn it into a liquid. During the process known as liquefaction, natural gas is cooled below its boiling point, removing most of the extraneous compounds found in the fuel. The remaining natural gas is primarily methane with small amounts of other hydrocarbons.

Because of LNG's relatively high production cost, as well as the need to store it in expensive cryogenic tanks, the fuel's widespread use in commercial applications has been limited. LNG must be kept at cold temperatures and is stored in double-walled, vacuum-insulated pressure vessels. LNG is suitable for trucks that require longer ranges because liquid is denser than gas and, therefore, more energy can be stored by volume. LNG is typically used in medium- and heavy-duty vehicles. One GGE equals about 1.5 gallons of LNG.

Answer:

1.2M

Explanation:

Initial Volume 0.05L

Final Volume 0.250L

HCl Molar mass: 36.46 g/mol

M = 6M HCl

Molarity = mol solute /  L of solution

Inital M = Molarity = 6

mol solute = X = unknown

L of Solution = 0.05L

6 = X / 0.05

X = 0.3

X = 0.3/0.25

X = 1.2 M

​  

somethingExplanation:

Answer: If a reaction has a low rate that means the molecules combine at a slower speed than a reaction at a higher rate

Explanation:

The rate of a reaction for a chemical reaction is change in concentration of reactants or change in concentration of products per unit time.Rate of reaction depends on type and nature of reaction.It also depends onthe physical state of reactants, number of reactants and complexity of reaction.

The rate of reaction:

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To produce 6.5 moles of \(P_4O_{10\), we would need 26 moles of \(PH_3\).

To determine the number of moles of \(PH_3\) required to produce 6.5 moles of \(P_4O_{10\), we need to consider the balanced chemical equation for the reaction. The balanced equation for the combustion of phosphine (\(PH_3\)) to form tetraphosphorus decoxide (\(P_4O_{10\)) is:

4 PH3 + 10 O2 → P4O10 + 6 H2O

From the balanced equation, we can see that 4 moles of \(PH_3\) react to produce 1 mole of \(P_4O_{10\). Therefore, the ratio of moles of \(PH_3\) to moles of \(P_4O_{10\) is 4:1.

If we want to produce 6.5 moles of \(P_4O_{10\), we can calculate the number of moles of PH3 required using this ratio:

6.5 moles P4O10 × (4 moles \(PH_3\) / 1 mole P4O10) = 26 moles PH3

Therefore, to produce 6.5 moles of \(P_4O_{10\), we would need 26 moles of \(PH_3\).

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Answer:

7. isotonic

8. hypertonic

9. hypotonic

10. isotonic

11. hypotonic

12. hypertonic

Answer: B

Explanation:

There is an atom of one type of element and then two atoms of another type of element.

Amorphous polymer structures do not have a crystalline structure, while crystalline polymers are organized into a 3-dimensional crystalline lattice structure. The degree of crystallinity in a polymer affects its properties, including melting temperature, hardness, and stiffness.

The properties of crystalline and amorphous polymers differ due to differences in the way that the chains are arranged.

Crystalline polymers have well-defined melting points, a higher modulus, strength, and a greater degree of chemical and thermal stability. This is because the molecular chains are highly organized and packed together tightly.

Amorphous polymers, on the other hand, do not have a specific melting point, but instead, they soften gradually upon heating. Amorphous polymers have a lower modulus and a lower degree of thermal stability compared to crystalline polymers. They also tend to be more transparent, as the disorganized chains allow light to pass through more easily.

The atomic structure of a material is determined by its composition, specifically the type and arrangement of atoms present. This can be determined using techniques such as X-ray diffraction and electron microscopy. The atomic structure of a material affects its properties, as the arrangement of atoms affects the material's strength, reactivity, and other characteristics. For example, the presence of specific atomic bonds can determine a material's ability to conduct electricity, while the size and shape of atoms can affect the material's density and hardness.

By understanding the atomic structure of a material, scientists and engineers can develop new materials with specific properties for different applications.

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