what is the density (g/l) of xenon gas at stp?

Answer:

Burning of fossil fuels releases a lot of pollutants such as sulphur dioxide and nitrogen dioxide into the atmosphere, and reacts with the water in the atmosphere to form sulphuric acid or nitric acid. Hence, acid rain is formed as that acid comes down from the atmosphere along with the rain.

Explanation:

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Other names for aluminum chloride include aluminum trichloride and aluminum (III) chloride. Aluminum and chlorine react with one another to create the chemical. AlCl3 is how its chemical formula is denoted.

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Answer:

The  electronegativity   of fluorine  compare  to the  electronegativity   of oxygen and chlorine as below

Explanation:

Fluorine  has the highest electronegativity than oxygen, and  chlorine.

 Explanation

Generally  the  electronegativity  increase   across the period ( from the left to the right)  and  decreases down  the group.

Both oxygen and fluorine  are in period 2   in  periodic   table. since  fluorine is on  fur  right side as compared to oxygen , fluorine has higher  electronegativity than  oxygen.

On the  other side  Fluorine  and  chlorine are  in the same group in periodic table. fluorine  is at  the top of  the group  while chlorine  is at  the bottom therefore fluorine has  higher electronegativity  than chlorine.

Lithium becomes Li+ by losing 1 electron and chlorine becomes Cl− by accepting electrons. Therefore it ionic compound, LiCl is formed.

Lithium belongs to Group 1 of the periodic table which means that Lithium has one electron in its valence shell and this electron is located in the 2s orbital. The single electron is represented as dot around the Lithium symbol.

The ionic bond formation of lithium chloride involves transfer of electrons from lithium to chlorine and forming, Li+ and Cl− in LiCl.

A bond between metal and nonmetal is said to be ionic in nature or is said that it has high ionic character. Therefore, we can say that  LiCl bond is an ionic bond.

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Hope you could understand.

If you have any query, feel free to ask.

Answer:

A microhabitat is a small or localized ecosystem in a larger ecosystem where a range of small populations of plants and animals sustain and main a micro-ecosystem.

Rotting or decomposing log is an example of the microhabitat as it provides food shelter, and various plants and organisms found and interact to make it an ecosystem. There are also interactions between biotic and abiotic factors. Many other characteristics present in this small ecosystem as given in the question.

A microhabitat is a small or localized ecosystem in a more extensive ecosystem a range of small populations of plants, animals sustain main a micro-ecosystem.

A rotting or decomposing log is an illustration of a microhabitat as it nourishes food shelter, and different plants and organisms found and interact to create an ecosystem. There are also interchanges between biotic and also abiotic factors. Multiple different characteristics are present in this small ecosystem as given in the question.

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The true statement about acids and bases is; acids mixed with bases neutralize each other. Option 1 is correct.

When an acid reacts with a base, they undergo a chemical reaction called neutralization, resulting in the formation of water and a salt. The hydrogen ions (H⁺) from the acid react with the hydroxide ions (OH⁻) from the base to form water (H₂O), while the remaining ions from the acid and the base combine to form a salt.

The neutralization reaction between acids and bases results in the formation of a neutral solution, with a pH close to 7. This is because the acidic and basic properties of the original substances are cancelled out or neutralized by each other.

Hence, 1. is the correct option.

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Answer:

Yes, water molecules remain the same despite the phase

Explanation:

When water is in the form of ice, it molecules remain the same only the distance between the molecule. This distance is higher than that of the inter molecular distance between liquid water molecules. Due to this reason ice is lighter than water.  

Now in gaseous phase, the intermolecular distance increases thereby making it lighter than solid ice and liquid water.

Answer:

light intensity

Explanation:

Answer:

Coductivity

Explanation:

Because heat conducts to them!

Answer:

The information from Mariner 6 and Mariner 7

Explanation:

Because they had not been launched yet

Answer:

Flame test is one of the chemical tests that can be used to identify a metal or metaloid

in an ionic compound.

Explanation:

Flame test is guided by a principle that when an unknown metal is heated, heat of the flame converts the metal ions into atoms which become excited and emit visible light.

To carry out flame test in a laboratory the following instruments are required:

--> a wire loop

--> Bunsen burner

--> the chemical compound under observation

--> protective wears.

The procedure involves the following steps:

--> turn on the Bunsen burner and adjust the barrel of the burner roll the flame is blue.

--> using a clean wire loop deep into a beaker containing hydrochloric acid.

--> to ensure that the loop is clean, it will give the same blue colour of the flame when heated.

--> deep the loop in the acid again and then use it to pick few grains of the metal.

--> place the wire loop in the side of the flame and observe the colour of the flame.

Result of flame tests of some metallic ion will show the following:

--> sodium ion will give yellow colour flame

--> potassium ion will give lilac colour flame

--> calcium ion will give orange-red colour flame

Answer:

C. ion concentrations are no longer changing and the voltage is 0.

Explanation:

Electrochemical cells are a device that generates current from redox reactions. In the cell, the equilibrium is reached when the voltage drops to 0. Thus, option C is correct.

An electrochemical cell is a voltaic device that uses chemical energy to generate electrical energy and vice versa. It is of two types electrolytic and galvanic cells depending on the energy it produces.

The electrochemical cell comprises two electrodes namely an anode and cathode, a salt bridge or the porous barrier, and an external connection.

The connection shows the voltage that indicates the equilibrium. When the current flow stops and the voltage reaches zero, the electrochemical cell is said to be in equilibrium.

Therefore, no change in the ionic concentrations and zero voltage indicates equilibrium.

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Answer: 3 they move more freely since water is a liquid and ice is a solid in a solid molecules are more compact and cannot move around much but in a liquid it moves more freely than it would in a solid.

Explanation:

Compared to ice, molecules of water behave differently in that they move more freely. The Option C.

In the solid state, water molecules arrange themselves into a crystal structure, forming a lattice in ice. This lattice structure restricts the movement of the water molecules causing them to vibrate in fixed positions.

On the other hand, in the liquid state, the water molecules have more kinetic energy allowing them to move more freely and interact with each other by forming temporary hydrogen bonds. This increased mobility of water molecules in the liquid state enables them to flow and take the shape of their container.

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Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

\(P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ \)

From the question

actual density = 7.80 g/cm³

error = 7.30 - 7.80 = 0.5

We have

\(p(\%) = \frac{0.5}{7.8} \times 100 \\ = 6.410256...\)

We have the final answer as

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U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

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The percent error for the heat of combustion of sugar, given an accepted value of 5639 kJ/mol and a measured value of 5700 kJ/mol, is approximately 0.79%.

To calculate the percent error, we substitute the measured value (M) and the accepted value (A) into the formula:

Percent Error = [(M - A) / A] × 100%

In this case, the measured value is M = 5700 kJ/mol, and the accepted value is A = 5639 kJ/mol. Substituting these values into the formula, we have:

Percent Error = [(5700 - 5639) / 5639] × 100%

= (61 / 5639) × 100%

≈ 0.79%

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Answer:

left = HCl

Middle = NH3

Right = water

Explanation:

HCl is a strong acid so it will have the strongest effect

NH3 is a weak acid so it will have a small effect

Water has no effect

Answer:

8.8g

Explanation:

They said that was the answer.

The enthalpy of the reaction P₄O₆(s) + 2O₂(g) → P₄O₁₀(s) calculated from the enthalpies of the reactions P₄(s) + 3O₂(g) → P₄O₆(s) and P₄O₁₀(s) → P₄(s) + 5O₂(g) is -1300 kJ.

Enthalpy is a thermodynamic property of a system. It is the sum of the internal energy added to the product of the pressure and volume of the system. Enthalpy is denoted as H.

We need to find the enthalpy of the following reaction:

P₄O₆(s) + 2O₂(g) → P₄O₁₀(s)      ... (1)

And we know the enthalpies of the reactions:

P₄(s) + 3O₂(g) → P₄O₆(s)   ΔH₁ = -1640.1 kJ  ....  (2)

P₄O₁₀(s) → P₄(s) + 5O₂(g)  ΔH₂ = 2940.1 kJ    .... (3)  

To calculate the enthalpy of reaction (1) using the values of enthalpies of reactions (2) and (3), we need to make the following changes for these two reactions:

1. Invert reaction (3):

P₄(s) + 5O₂(g) → P₄O₁₀(s)  ΔH₂ = -2940.1 kJ  ...  (4)                    

Now we have the P₄O₁₀ on the side of the product as in reaction (1). The inversion changed the sing of enthalpy ΔH₂.

2. Invert reaction (2):

P₄O₆(s) → P₄(s) + 3O₂(g)  ΔH₁ = 1640.1 kJ  .... (5)  

The compound P₄O₆ is now on the side of the reactant as in reaction (1). The inversion changed the sing of enthalpy ΔH₁.  

Now, the addition of reactions (4) and (5)

To get the reaction (1) we need to add reactions (4) and (5)

P₄(s) + 5O₂(g) + P₄O₆(s) → P₄O₁₀(s) + P₄(s) + 3O₂(g)

Now, reaction (1) will be

P₄O₆(s) + 2O₂(g) → P₄O₁₀(s)

The enthalpy value of the reaction (1) can be calculated by the sum of the enthalpies of the reactions (4) and (5):

ΔH = ΔH₁ + ΔH₂

ΔH = 1640.1 + (-2940.1)

ΔH = -1300 kJ

Therefore, the enthalpy of the reaction P₄O₆(s) + 2O₂(g) → P₄O₁₀(s) calculated from the enthalpies of the reactions P₄(s) + 3O₂(g) → P₄O₆(s) and P₄O₁₀(s) → P₄(s) + 5O₂(g) is -1300 kJ.

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Answer:

option B

p4O6(s) + 2O2(g) Right arrow. P4O10(s)

Explanation:

just did it. edge 2022

The required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

To determine the required heat in BTU, for the water at 50°C to become ice at -50°C, we need to calculate the heat of fusion and the heat of cooling of water. We can use the following formula to calculate the required heat.

Q = mL

Where:Q is the required heat in BTU.

m is the mass of water in pounds.L is the specific heat of water at the desired temperature.

Lf is the heat of fusion of water.

Lc is the specific heat of ice.

Using the above formula, we get;

Q = mLf + mL + mLc

The heat of fusion of water is 144 BTU/lb

The specific heat of water at 50°C is 1.00 BTU/lb °F.

The specific heat of ice is 0.5 BTU/lb°F.

We know that: 1°C = 1.8°F.

So,50°C = 122°F and -50°C = -58°F

Also, the mass of water is not given, so let us assume that the mass of water is 1 lb.

Thus;

Q = mLf + mL + mLc

Q = 1(144) + 1(1.00)(122-32) + 1(0.5)(-50-0)

Q = 144 + 90 + (-25)

Q = 209 BTU/lb

Therefore, the required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

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Answer:

See explanation

Explanation:

According to the kinetic theory, a gas temperature is a measure of the average kinetic energy of the molecules of the gas. Thus, when the balloon is attached to the opening of a glass bottle placed in a hot water bath for some time, the molecules of the gas inside the balloon acquire greater kinetic energy and move faster. Hence, the molecules spread out and the gas expands - its size increases.

When the bottle is placed into a jar of cold water with ice cubes, the molecules of the gas loose energy and begin to coalesce. As a result of this, the volume of the gas decreases and the balloon shrinks. This is a demonstration of Charles law.

Answer:

According to the kinetic theory, a gas temperature is the measure of the average kinetic energy of the molecules of gas. Thus, when the balloon is attached to the opening of a glass bottle placed in a hot water bath for some time, the molecules of gas inside the balloon acquire greater kinetic energy thus moving faster. Hence, the molecules spread out and the gas expands thus expanding the balloon.

 When the bottle is placed in a cold jar of cold water with ice cubes, the molecules of the gas loose energy thus decreasing the speed of the molecules within the gas. As a result of this, the size of the balloon should begin to shrink and so does the volume of the gas. Therefore, innately showing a demonstration of Charles' law of gasses which is the law that the volume of gasses is proportional to the temperature, (if the volume increases so does the temperature and vice versa). 

Explanation:

I took the exam and go tthis question correct.

Answer:

Phosphorus is required for the growth of the phytoplankton.

Explanation:

Water 3.0 deals mainly with sewage treatment. The primary aim of this project is to reduce the harmful impacts of chemical pollutants from industrial and agricultural activities on natural water resources.

Currently, used wastewater treatment technologies can break down some of the chemicals in wastewater but not all of them. Chemicals that are not broken down are referred to as persistent organic pollutants. These chemicals persist in the environment for long periods, and they can cause severe damage to aquatic life and human health.
Currently, the primary challenge facing water treatment technologies is the removal of persistent organic pollutants such as pesticides, pharmaceuticals, and endocrine-disrupting chemicals from wastewater.

These pollutants are generally water-soluble and resist microbial degradation, making them hard to remove from wastewater using current water treatment technologies. For example, conventional activated sludge treatment used in wastewater treatment plants does not remove some persistent organic pollutants from wastewater.
Failure to remove these pollutants from wastewater can have significant environmental and health impacts.

For example, pharmaceutical chemicals can cause antibiotic resistance, while endocrine-disrupting chemicals can cause birth defects, cancer, and other health problems.

Therefore, there is a need to improve wastewater treatment technologies to remove persistent organic pollutants from wastewater.
In conclusion, wastewater treatment technologies can break down some chemicals but not all. Chemicals that are not broken down are persistent organic pollutants and pose a significant risk to the environment and human health. Therefore, it is important to develop wastewater treatment technologies that can remove these pollutants from wastewater.

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Solution :

The mass percent of NaNO₃ is 18.60% .

To Find :

The mass percent of a solution that is composed of 8.00 g NaNO3 dissolved in 35.0 g of water.

Solution :

Mass percentage is given as :

\(Mass \ percentage = \dfrac{mass\ of \ chemical}{total \ mass \ of \ compound}\\\\Mass \ percentage = \dfrac{8}{(8+35)} \times 100 \%\\\\Mass \ percentage = 18.60 \%\)

Therefore, the mass percentage of NaNO₃ is 18.60% .