im really tired and csant think plz help



'describe potasium in your own words'

'how is potassium used'

'where is potassium commonly found?'

Answer: kerosene, coal

Explanation:

These are renewable resources obtained from petroleum, kerosene was used in olden times to light the lamps and are still used today for lighting purposes. Coal was used in trains to produce steam( steam powered trains).

Answer:

Fuel Oil and Kerosene Oil are used as fuel. They are an important part of our life. Kerosene Oil is primarily used in the laboratory. Fuel Oil is used in power stations.

Answer:6.7103x10^5 km

Explanation:

The planet is at a distance of about 6.71030 ×10⁵ km. Therefore, option (c) is correct.

Scientific notation is a way of representing a quantity as a number having significant digits that are necessary for a specified degree and multiplied by ten to the power.

The general form of scientific notation can be written as \(N \times 10^{a}\).

A significant digit is that digit in a number which adds to its precision. A significant includes all nonzero numbers, zeros between significant digits, and zeros represent to be significant while leading and trailing zeros are not significant digits as they exist only to represent the scale of number.

Given, using the scientific notation method we can write the scientific notation of the distance of 671,030 km.

The number 671,030 km can also be written as 6.71030 ×10⁵ km.

Therefore, the correct way to write this distance in the scientific notation of  671,030 km is 6.71030 ×10⁵ km.

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The percentage of fluorine in the given compound is 49%.

The given compound;

CaF₂

The molecular mass of the given compound is calculated as follows;

CaF₂ = (40) + (19 x 2)

        =   40  +  38  

        =  78 g/mol

The mass of fluorine in the given compound = 38 g/mol

The percentage of fluorine in the given compound is calculated as follows;

\(= \frac{38}{78} \times 100\%\\\\= 48.7 \%\\\\\approx 49\%\)

Thus, the percentage of fluorine in the given compound is 49%.

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The sample with the lowest boiling point when dissolved in 1.0 liter of water is sodium chloride (NaCl). Sodium chloride is a common salt compound which, when dissolved in water, lowers the boiling point of the solution.

To calculate the boiling point, use the following equation: Boiling Point = K b x m, where Kb is the ebullioscopic constant and m is the molality of the solution.

The ebullioscopic constant for sodium chloride is 0.51 K kg mol-1 and the molality is equal to the number of moles of solute divided by the volume of the solution. Therefore, for a 1.0 liter solution, the boiling point of the solution would be 0.51 K kg mol-1 x 0.78 moles/1.0 liter = 0.398 K kg mol-1.

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Answer:

The correct answer is - 3.864 L of CO2.

Explanation:

Chemical properties of matter are categorized as  intensive or extensive, this statement is false.

Chemical properties are characteristics of a substance that may be seen or quantified when it changes chemically.

Chemical properties include reactivity, flammability, and the capacity for corrosion. Reactivity is the ability of a substance to interact chemically with other substances.

Chemical attributes include things like flammability, toxicity, acidity, several types of reactivity, and heat of combustion.

Color, density, hardness, and melting and boiling points are examples of physical qualities. The capacity of a substance to go through a particular chemical transition is described by its chemical property. We search for a chemical change to locate a chemical attribute.

Thus, option B is correct.

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Answer:

33% yield

Explanation:

6.26/18.81 =0.33280170122 = 33%

After considering the given data we conclude that the the formula for the conjugate base of \(H_2O\) is \(OH^-\).

The formula for the conjugate base of \(H_2O\) is \(OH^-\). This is confirmed by multiple sources, including articles and research materials . According to the Bronsted-Lowry theory, an acid is capable of donating a proton \((H^+)\) and a base is capable of accepting \(H ^+\) ions.
In the case of \(H_2O\), it can act as both an acid and a base, but when it donates a proton, it forms the hydroxide ion \((OH^-)\), which is its conjugate base. Therefore, the formula for the conjugate base of \(H_2O\) is \(OH^-\).
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The final concentration of NH₃ is greater than the initial concentration due to Le Chatelier's principle, which states that when a system at equilibrium is subjected to a change in concentration, pressure, or temperature, the system will adjust to counteract the change and restore equilibrium.

In the context of the Haber process, where nitrogen (N₂) and hydrogen (H₂) react to form ammonia (NH₃), the reaction can be represented as:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
When the initial concentration of NH₃ is increased, according to Le Chatelier's principle, the system will try to counteract the change by shifting the equilibrium position to reduce the concentration of NH₃. This can be achieved by favoring the reverse reaction, in which NH₃ is consumed, and N₂ and H₂ are produced.
On the other hand, if the initial concentration of NH₃ is decreased, the system will attempt to increase the concentration of NH₃ to restore equilibrium. It does this by shifting the equilibrium position in the direction of the forward reaction, in which N₂ and H₂ react to form NH₃. This results in a higher final concentration of NH₃ than the initial concentration, as the system adjusts to counteract the change and restore equilibrium.

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The magnitude of the force acting on the body is 4000 Newtons.

To find the magnitude of the force, we can use Newton's second law of motion, which states that the force applied to an object is equal to the product of its mass and acceleration.

The given information includes the mass of the body (80 kg) and the resulting velocity (10 m/s). However, since the time duration (0.2 seconds) is also provided, we can use it to calculate the acceleration of the body.

The formula to calculate acceleration is:

Acceleration = Change in Velocity / Time

The change in velocity can be calculated by subtracting the initial velocity (which is 0 m/s as the body is at rest) from the final velocity:

Change in Velocity = Final Velocity - Initial Velocity

Change in Velocity = 10 m/s - 0 m/s

Change in Velocity = 10 m/s

Now, we can calculate the acceleration:

Acceleration = Change in Velocity / Time

Acceleration = 10 m/s / 0.2 s

Acceleration = 50 m/s²

Finally, we can calculate the magnitude of the force using Newton's second law:

Force = Mass x Acceleration

Force = 80 kg x 50 m/s²

Force = 4000 N

Therefore, the magnitude of the force acting on the body is 4000 Newtons.

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Answer:

Alkali metals are among the most reactive metals. This is due in part to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. ... All these characteristics can be attributed to these elements' large atomic radii and weak metallic bonding.

Explanation:

I hope it will help you.....

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Answer:

ions with opposite charge

Explanation:

ionic bond is formed between oppositely charged ions in a chemical compound.

Answer: ions with opposite charges

Explanation:

Answer: hydrogen + oxygen Right arrow .water

Explanation:

The exact equation for this reaction is;

2H2  +  O2 ------------->   2H2O

hydrogen + oxygen Right arrow. water is the correct option.

The equation shows hydrogen reacting with oxygen to form water is as follows:-

\(2H_2+O_2\rightarrow2H_2O\)

The above reaction in word form is written as follows:-

\(hydrogen+Oxygen \rightarrow water\)

So, hydrogen + oxygen Right arrow. water is the correct option.

Hydrogen-H

Oxyden-O

Water-\(H_2O\)

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Answer:

What's surprising, however, is that a washing machine requires way less electricity than a dryer. An average cycle for a washing machine is 30 minutes. This appliance, which is a widely used Energy Star model, needs 500 watts per hour to run, which means it requires 250 Wh, or 2.25 kWh, to run for 30 minutes.

Answer:

\(I'm~here~to~help!\)

The correct option is B. Dryer, because a washing machine uses 1,200 or 3,000 watts on average, while a dryer uses 1,800 or 5,000 watts. That is a lot of watts!

The element with the given electronic configuration 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p¹  is indium.

The Lewis dot structure is shown in the attached image.

The electronic configuration of indium can be written as 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p¹ or [Kr]4d¹⁰5p¹.

The atomic number of Indium is 49.

Chemically speaking, indium has the atomic number 49 and the symbol In. The most malleable metal that isn't an alkali metal is indium. It is a white or silvery metal with a tin-like look.

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Answer:

Calculating the molar mass of each compound as well as the mass of the sodium in each compound will help us identify which compound has the highest mass percentage of sodium. After that, we can determine the salt content in mass.

Molar mass of NaCN = 49.0 g/mol

Mass of Na in NaCN = 23.0 g/mol

Percentage of Na by mass in NaCN = (23.0 g/mol / 49.0 g/mol) x 100% = 46.9%

Molar mass of NaN3 = 65.0 g/mol

Mass of Na in NaN3 = 23.0 g/mol

Percentage of Na by mass in NaN3 = (23.0 g/mol / 65.0 g/mol) x 100% = 35.4%

Molar mass of NaOH = 40.0 g/mol

Mass of Na in NaOH = 23.0 g/mol

Percentage of Na by mass in NaOH = (23.0 g/mol / 40.0 g/mol) x 100% = 57.5%

Molar mass of NaCl = 58.4 g/mol

Mass of Na in NaCl = 23.0 g/mol

Percentage of Na by mass in NaCl = (23.0 g/mol / 58.4 g/mol) x 100% = 39.4%

Therefore, NaOH contains the greatest percentage of sodium by mass, at 57.5%.

Based on the masses that react, we have 0.5 mol of \(NaOH\) and 0.185 mol of FeCl₃, which react to form 0.185 mol of Fe(OH)₃.

To calculate the amount (mol) of each compound based on the masses that react, you first need to use the given molar masses to convert the mass of each compound to moles. This can be done using the formula:

moles = mass (in grams) / molar mass (in grams/mol)

For example, if we have 20 grams of NaOH, we can calculate the number of moles as:

moles\(NaOH\) = 20 g / 40.00 g/mol = 0.5 mol

Similarly, if we have 30 grams of \(FeCl₃,\) we can calculate the number of moles as:

moles FeCl₃ = 30 g / 162.21 g/mol = 0.185 mol

Therefore, we have 0.5 mol of NaOH and 0.185 mol of FeCl₃ reacting with each other. The balanced chemical equation for the reaction is:

\(3 NaOH + FeCl₃ → Fe(OH)₃ + 3 NaCl\)

From the equation, we can see that 3 moles of NaOH react with 1 mole of FeCl₃ to produce 1 mole of Fe(OH)₃ and 3 moles of NaCl. Since we have excess NaOH in this case, we can use the amount of FeCl₃ to determine the limiting reactant and the amount of product formed.

Since we have 0.185 mol of FeCl₃ and it reacts with 3 moles of NaOH, the amount of NaOH required for complete reaction would be:

moles \(NaOH required = 0.185 mol FeCl₃ × (3 mol NaOH / 1 mol FeCl₃) = 0.555 mol\)

Since we have 0.5 mol of NaOH, it is the limiting reactant and only 0.185 mol of FeCl₃ will react to form the product. The amount of Fe(OH)₃ formed can be calculated as:

\(moles EditCopy equationRemove formed = 0.185 mol FeCl₃ × (1 mol Fe(OH)₃ / 1 mol FeCl₃) = 0.185 mol\)

Therefore, we have 0.5 mol of\(NaOH\)and 0.185 mol of FeCl₃, which react to form 0.185 mol of Fe(OH)₃.

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The 22.7 g  in μg ( micro gram )  is 22.7 × \(10^{-6}\) .

We need to convert between units in order to ensure accuracy and prevent measurement misinterpretation.

For example , we do not measure a pencil's length in kilometers . In this situation , one must convert from kilometers  ( km ) to centimeters ( cm ) . In most cases, multiplicative conversion factors are used to convert one unit to another of the same quantity .

Sometimes the units of measurement used may not correspond to the standards required for a particular process or application, as well as the measuring choice and convenience. The mass of object in micro gram unit is less than gram .

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If K = 1/2 and the temperature is raised, then the forward reaction is favored.

The value of the equilibrium constant (K) provides information about the relative concentrations of reactants and products at equilibrium. If K = 1/2, it indicates that the concentration of products is half that of the reactants at equilibrium.

When the temperature is raised, the equilibrium position of a reaction can be shifted in favor of either the forward or reverse reaction depending on whether the reaction is exothermic or endothermic.

In this case, since it is stated that the forward reaction is favored when the temperature is raised, we can infer that the reaction is endothermic. When the temperature increases, the system tries to counteract the temperature rise by absorbing heat. By favoring the forward reaction, the system consumes heat, which is an endothermic process.

Therefore, if K = 1/2 and the temperature is raised, the forward reaction is favored as the system shifts to absorb heat and reach a new equilibrium with a higher concentration of products.

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The total heat energy required is expressed according to the formula:

where:

Qvap is the heat energy absorbed by the vapor

Qw is the heat energy absorbed by the water

Get the heat energy absorbed by the vapor at 100 degrees

Given the following parameters;

Mass of water = 100g

Molar mass of water (H2O) = 18.015g/mol

Hvap,w = 2259 J/g = 40.8 kJ/mol

Substitute the given parameters into the formula to have:

Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.

Get the total heat energy required;

The potential problems associated with a deep well injection is that it can result in polluting underground water.

If there are many wells nearby, injecting wastewater into subsurface rock strata can be problematic. Consider porous sandstone, which contains minute openings. Water under high pressure, such as wastewater from fracking, can penetrate the sandstone and travel with underground water.

An injection well is employed to inject fluid underground into porous geologic formations. These subterranean structures might be anything from a modest soil layer to thick sandstone or limestone. Water, wastewater, brine (salt water), and water that has been combined with chemicals are all examples of injected fluids.

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The four components that are universally present in all addictions, irrespective of whether they are chemical or behavioral in nature, include compulsive craving, loss of control, negative consequences, and persistence despite adverse effects.

Compulsive craving refers to the intense and persistent desire or urge to engage in the addictive behavior or consume the addictive substance. It becomes a central focus of the individual's thoughts and can be difficult to resist.

Loss of control characterizes addiction as the person finds it challenging to limit or stop their engagement in the addictive behavior or substance use. They may struggle to adhere to self-imposed limitations or experience difficulty in moderating their consumption.

Negative consequences encompass the adverse effects that addiction has on various aspects of an individual's life, including physical health, mental well-being, relationships, work or school performance, and overall functioning. These consequences may range from health issues, financial problems, social isolation, to legal difficulties.

Persistence despite adverse effects refers to the continued engagement in the addictive behavior or substance use, even in the face of negative consequences. Despite being aware of the harm caused, the person finds it difficult to quit or control their addictive behavior.

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The metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

The amount of heat Q = mcΔT where

Making ΔT subject of the formula, we have

ΔT = Q/mc

Given that Q and m are the same for each metal,

ΔT ∝ 1/c

We see that the temperature change is inversely proportional to the specific heat capacity.

Since the metals are at the same temperature, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

So, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

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The drug concentration in the injection is 5294 mol/L, assuming a 90% availability of the drug.

To calculate the drug concentration in mol/L, we need to first convert the initial drug dose from mg to mol. We can do this by dividing the initial dose by the molecular weight of the drug.

Assuming we don't know the specific drug being referred to, let's use an average molecular weight of 200 g/mol for illustration purposes.

5882 mg ÷ 200 g/mol = 29.41 mmol

Now we can calculate the concentration by dividing the number of moles by the volume of the solution (in liters).

5 mL = 0.005 L

Concentration = 29.41 mmol / 0.005 L = 5882 mol/L

However, this concentration is not a valid answer because it implies that 100% of the drug is available for use, which is not the case. We need to take into account the fact that only a certain percentage of the drug is available for use after dilution.

Let's assume that the dilution process results in a 90% availability of the drug. This means that only 90% of the initial drug dose is available for use in the injection.

90% of 29.41 mmol = 26.47 mmol

Now we can recalculate the concentration based on the available amount of drug.

Concentration = 26.47 mmol / 0.005 L = 5294 mol/L

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The coefficients needed to balance the redox reaction are: 2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction requires two molecules of chlorine gas to react with one atom of iron, producing one Fe3+ ion and two chloride ions. We need to balance both the mass and charge on each side of the equation.

Step 1: Balance the atoms other than oxygen and hydrogen.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq)

Step 2: Balance the oxygen atoms by adding water (H2O) molecules.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 3: Balance the hydrogen atoms by adding hydrogen ions (H+).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 4: Balance the charges by adding electrons (e-).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l) + 6e-

The balanced equation for the redox reaction is:

2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction is 2 Fe(s) + 3 Cl2(g) -> 2 Fe3+(aq) + 6 Cl-(aq) with coefficients 2, 3, 2, and 6 respectively.

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Answer:

1) Carrying capacity is the maximum number of individuals of a species that an environment can support.

2) Population - all the inhabitants of a particular town, area, or country.

3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.

4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.

After dragging the chlorine atom from number one carbon atom to the second one, it would be 2-cloromethyl-4-cylcopentane.

As chloride ions are larger in size than fluoride ions, oxide ions and most of cations of the metallic elements, it is difficult for them to migrate easily in solids. However, some chloride ion conductors are known although their conductivity is low compared to that of fluoride ion conductors.

     SnCl2 shows higher chloride ion conductivity than a PbCl2-based conductor, but it is chemically unstable in the atmosphere.

   As per the given condition we have to replace the chlorine from number one atom to the second atom in order to get the resonance structure.

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Answer:

出租車條形圖中的鹽湖和免費的非裔美國人的翻版是它

The IUPAC name for the compound is 2-Hydroxypropanoic Acid.

This compound is an organic acid composed of a three-carbon chain with a hydroxyl group and a carboxyl group.2-Hydroxypropanoic acid, also known as lactic acid, is a carboxylic acid that is a common metabolic intermediate in the breakdown of carbohydrates and proteins. It is an important part of the citric acid cycle and is produced in large amounts during the process of cellular respiration. Lactic acid is also an important component of many dairy products such as yogurt and cheese, and is used in some food processing techniques. It is used in the production of polylactic acid, a biodegradable plastic, and has also found uses in the medical and cosmetics industries.

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Answer:

3.9mole/liter

Explanation:

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