Xenon difluoride reacts with silica to produce?​

An existing ecosystem can suffer from damage from invasive species in many different ways, such as shifting habitats and depriving native creatures of food and resources.

An invasive species is an organism that damages the environment or the economy in a new location in which it is not native. Invasive species may disrupt the food chain of a ecosystem by killing or substituting natural food sources. The invasive species could provide little to no food value to wildlife.

Accidental introduction of invasive species into a new area is common. In Central Asia, the Black Sea and the Caspian Sea are home to zebra mussels. Zebra mussels accidently made their way to the Great Lakes of North America after becoming affixed to massive ships that sailed between the two areas.

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Answer:

Cellulose stimulates the work of intestines and increases their discharge.

Explanation:

Cellulose is a polysaccharide made of glucose polymers, which build plant fibers. Because of this, the plants possess their firmness.

Humans do not digest cellulose because they do not possess certain enzymes, but it is useful for their digestion because it stimulates the work of the intestines.

Cellulose enhances intestinal peristalsis. Peristalsis is series of contractions that allow the progressive movement of food through the digestive tract.

The molar mass of  tin(II) chloride is: 84.9 g

Calculate the molar mass of  tin(II) chloride?

The number of moles n1 is thus:

n1= m1/M1 = 2.25 mol

According to the balanced reaction, the ratio by number of moles n of tin(II) chloride produced to the number of moles n1 of HF used is 1:2

As such, the number of moles of tin(II) chloride produced is :

n = 1/2 \(n_{1}\) = 0.45 mol

The molar mass of tin(II) chloride is:

M= A\(_{r}\)(Sn)+2A\(_{r}\)(Cl) = 188.7 g/mol

The mass m produced is thus:

m = nM

= 0.45 mol × 188.7 g/mol

≈ 84.9 g

Therefore, the molar mass of  tin(II) chloride is: 84.9 g.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

the mass of a tree is primary carbon

Explanation:

the the carbon comes from carbon dioxide during photosynthesis

Answer:

Plants get all the carbon, hydrogen, and oxygen they need from carbon dioxide and water, which they use to build carbohydrates during photosynthesis. To build other kinds of molecules they also need elements like nitrogen, phosphorous, and sulfur. Plants get these as well as other elements from the soil.

Explanation:

HCl, HI, H₂SO₄, LiCl, and KI are all classified as acids. These compounds, HCl, HI, H₂SO₄, LiCl, and KI, all dissociate in water to release hydrogen ions (H⁺), which is the defining characteristic of acids.

Strong electrolytes are substances that completely dissociate into ions when dissolved in water, resulting in a high electrical conductivity. HCl, HI, H₂SO₄, LiCl, and KI all fall under this category. When these compounds dissolve in water, they break apart into their constituent ions, such as H⁺ and Cl⁻ for HCl, H⁺ and I⁻ for HI, H⁺ and SO₄²⁻ for H₂SO₄, Li⁺ and Cl⁻ for LiCl, and K⁺ and I⁻ for KI.

These ions are capable of conducting electricity in the solution, hence qualifying these compounds as strong electrolytes. It's important to note that strong electrolytes undergo complete ionization, meaning that nearly all of the compound dissociates into ions.

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Answer:

Sunlight.

Explanation:

Just did the test EDG202 :)

Answer:

The number of

atoms in the unit cell is 2

Explanation:

According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

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For the chemical reaction, 2HBr (aq) +Ba(OH)2​→2H2​O(l)+BaBr2​(aq), the net ionic equation is 

2H+(aq)+2Br-(aq)+Ba+2(aq)+2OH-(aq)---> 2H2O(l)+Ba+2(aq)+   

The only molecules or ions that are actively participating in the reaction or those that change are included in a net ionic equation. The ions of the spectator are absent from this equation. You can get this equation by leaving out the spectator ions from the full ionic equation. We emphasize the molecules that change in the process by using net ionic equations. It makes it simple to identify the chemicals that are driving a reaction. 

2HBr (aq) +Ba(OH)2​→2H2​O(l)+BaBr2​(aq) 

2H+ + Br2- + Ba+ +2OH-  à 4H+ +2O2- +Ba+  +Br2-

The net ionic equation can be written using the entire ionic equation. We start by determining the spectator ions.The spectator ions will have the same charge and state of matter in the reactants and products when examining the entire ionic equation. The bromine ion and the barium ion remain unchanged during this reaction. These are regarded as spectator ions as a result. We are left with the net ionic equation after removing the spectator ions. The following equation's net ionic formula is 

2H+(aq) + 2OH-(aq) -> 4H+(1)+2O22.   (1)

Charge on the left: +2 + (2) = 0. 

+4+(4)=0 for the right-side charge. 

The ionic equation is balanced. 

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To disinfect the dialysis station, you should mix a solution of 1:100 dilution of sodium hypochlorite (bleach) with water.

1. Gather the necessary supplies: sodium hypochlorite (bleach) and water.
2. Determine the desired volume of disinfectant solution needed to thoroughly clean the dialysis station.
3. Measure out the appropriate amount of bleach by dividing the desired volume by 100 (e.g., if you need 1000 mL of solution, use 10 mL of bleach).
4. Add the measured bleach to the remaining volume of water needed to reach the desired total volume (e.g., 990 mL of water in the example above).
5. Mix the bleach and water thoroughly to create a 1:100 bleach solution.
6. Use this solution to disinfect the dialysis station, following your facility's protocol and ensuring all surfaces are cleaned properly.

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the pressure in the balloon decreases- True

the pressure in the balloon increases- False

the volume of the balloon increases- True

the volume of the balloon decreases- False

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The pH of a 0.10 M solution of HCN (Ka = 4.0 x 10-10) is approximately 5.16.

The meaning of pH.pH is the negative logarithm of the hydrogen ion concentration in a solution. The pH scale ranges from 0 to 14, with values below 7 representing an acidic solution and values above 7 representing a basic solution.How to calculate the pH of a solution using Ka?The pH of a solution may be calculated using the Ka expression. The expression is given below:Ka = [H+][A-]/[HA]where, [H+] is the hydrogen ion concentration.[A-] is the concentration of conjugate base.[HA] is the concentration of acid.The expression can be rearranged to obtain the following equation:pH = -log [H+]where [H+] is obtained from the above expression.On substituting the given values, we have:[H+] = sqrt(Ka * C) = sqrt(4.0 x 10-10 x 0.10) = 2.0 x 10-6pH = - log [2.0 x 10-6] = 5.16The pH of a 0.10 M solution of HCN (Ka = 4.0 x 10-10) is approximately 5.16.

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Atoms of 124sn are present in 23.0 g of naturally going on the tin: The average atomic mass of Sn is 118. seventy-one g/mole percentage.

This is explained as the Atomic mass of Tin (Sn) = 118.71 g/mol. 1 mol of Sn = 118.71 g.

An atom is the smallest unit of everyday count that bureaucracies a chemical detail. each solid, liquid, gas, and plasma consists of neutral or ionized atoms. Atoms are extraordinarily small, commonly around one hundred picometers throughout.

An atom is a particle of count that uniquely defines a chemical detail. An atom includes a principal nucleus that is surrounded by one or extra negatively charged electrons. Atoms are built of two kinds of elementary particles: electrons and quarks. Electrons occupy an area that surrounds an atom's nucleus. each electron has an electrical rate of -1. Quarks make up protons and neutrons, which, in flip, make up an atom's nucleus.

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The [OH⁻] of the solution : 1 x 10⁻¹¹ M

Given

[H30) : 1 x 10-3 M.

Required

the [OH]

Solution

The water equilibrium constant is a product of the concentrations of [H3O +] and [OH-]

Kw = [H₃O⁺] [OH⁻]

Input the value of  [H₃O⁺]

1 x 10⁻¹⁴ = 1 x 10⁻³ x  [OH⁻]

[OH⁻] = 1 x 10⁻¹⁴ :  1 x 10⁻³

[OH⁻] = 1 x 10⁻¹¹ M

Therac-25, AECL was able to reduce costs by replacing hardware safety features with software controls.

the Therac-25 was a laptop-controlled radiation therapy machine produced by Atomic energy state Canada limited in 1982 after the Therac-6 and Therac-20 units. It was involved in at least six accidents between 1985 and 1987, in which patients were given massive overdoses state radiation.

The Therac-25 machine was a state-of-the-art linear accelerator developed by using the company Atomic strength Canada restricted (AECL) and a French company CGR to provide radiation treatment to cancer sufferers. The Therac-25 become the most computerized and complicated radiation therapy device state its time.

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A suitable solvent to use for the mobile phase of a normal phase TLC is a nonpolar solvent, such as hexane or heptane.

In normal phase TLC (Thin-Layer Chromatography), the stationary phase is polar (usually a polar silica gel or alumina) and the mobile phase is nonpolar. The goal is to separate and analyze polar compounds based on their relative affinity to the stationary and mobile phases.

Since the stationary phase is polar, a nonpolar solvent is used as the mobile phase to ensure good separation and elution of the analytes. Nonpolar solvents like hexane or heptane are commonly employed in normal phase TLC as they have low polarity and do not strongly interact with the polar stationary phase. This allows the analytes to migrate and separate effectively based on their polarity.

Using a nonpolar solvent as the mobile phase ensures that the elution order of compounds is determined mainly by their polar interactions with the stationary phase, making it suitable for normal phase TLC.

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The mystery compound's empirical formula is C₁₇H₂₁N₄O₄. The compound's molecular formula C₅₁H₆₃N₁₂O₁₂. We cannot conclude with certainty that the compound is candium based solely on its empirical and molecular formulas.

To determine the empirical formula of the mystery compound, we need to find the simplest whole-number ratio of the elements present in the compound. We can do this by assuming we have 100 grams of the compound, which allows us to directly convert the percentages to grams.

Percentage of carbon = 67.296%

Percentage of hydrogen = 6.991%

Percentage of nitrogen = 4.618%

Percentage of oxygen = 21.095%

Assuming we have 100 grams of the compound, we can calculate the mass of each element:

Mass of carbon = 67.296 g

Mass of hydrogen = 6.991 g

Mass of nitrogen = 4.618 g

Mass of oxygen = 21.095 g

Next, we need to convert the mass of each element to moles using their respective molar masses. The molar mass of carbon (C) is 12.01 g/mol, hydrogen (H) is 1.008 g/mol, nitrogen (N) is 14.01 g/mol, and oxygen (O) is 16.00 g/mol.

Moles of carbon = 67.296 g / 12.01 g/mol ≈ 5.607 mol

Moles of hydrogen = 6.991 g / 1.008 g/mol ≈ 6.930 mol

Moles of nitrogen = 4.618 g / 14.01 g/mol ≈ 0.329 mol

Moles of oxygen = 21.095 g / 16.00 g/mol ≈ 1.318 mol

Now, we need to find the simplest whole-number ratio of the moles of each element. To do this, we divide each number of moles by the smallest number of moles (in this case, the moles of nitrogen):

Moles of carbon = 5.607 mol / 0.329 mol ≈ 17.03

Moles of hydrogen = 6.930 mol / 0.329 mol ≈ 21.07

Moles of nitrogen = 0.329 mol / 0.329 mol = 1

Moles of oxygen = 1.318 mol / 0.329 mol ≈ 4

Based on the ratios, the empirical formula of the mystery compound is  C₁₇H₂₁N₄O₄.

To determine the molecular formula, we need to compare the empirical formula mass to the experimental molar mass given (910.035 g/mol). The empirical formula mass can be calculated by summing the molar masses of the elements in the empirical formula:

Empirical formula mass = (17 * 12.01 g/mol) + (21 * 1.008 g/mol) + (4 * 14.01 g/mol) + (4 * 16.00 g/mol) ≈ 287.28 g/mol

To find the molecular formula, we divide the experimental molar mass by the empirical formula mass and round to the nearest whole number:

Molecular formula = Experimental molar mass / Empirical formula mass

Molecular formula = 910.035 g/mol / 287.28 g/mol ≈ 3.17

Since the calculated value is approximately 3, we multiply the empirical formula by 3 to get the molecular formula:

Molecular formula = ( C₁₇H₂₁N₄O₄)₃ = C₅₁H₆₃N₁₂O₁₂

Based on the analysis, the compound's molecular formula is C₅₁H₆₃N₁₂O₁₂. However, we cannot conclude with certainty that the compound is candium based solely on its empirical and molecular formulas. Further evidence and analysis are needed to determine the actual identity of the compound.

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Explanation:

1.ca

2.H

3.O

.................

#17

#a

Group 15 elements have valency 3

#b

Let's check the EC of both

\(\\ \rm\Rrightarrow [O]=1s^22s^22p^4\)

\(\\ \rm\Rrightarrow [S]=[Ne]3s^23p^4\)

#c

Decrease in size

#18

#a

#b

#c

Answer:

The temperature of the cooking liquid. Oil will generally be a lot hotter and will cook faster, resulting in different texture. Well it's because the highest temperature possible in cooking in water is 100 C. With cooking in oil temperature can reach to as high as 230 - 240 C.

Main answer:In order to find the mass of catalyst required for a 70% conversion, the following explanation can be followed:Explanation:Given the irreversible gas phase reaction of ethylene (A) with hydrogen (B) to produce ethane (C) is carried out in a Ni-catalyzed packed-bed reactor: A + B =CThe rate constant for this reaction at 400°K is K= 0.2 L2 /mol s Kg catThe feed stream contains an equimolar amount of A and B and enters a temperature of 400°K and a pressure of 5 atm with a total volumetric flow rate of 8 L/sTo find the mass of catalyst required for a 70% conversion, the following equation can be used:Plug the given values in the equation:To convert L/s into mol/s, the following formula can be used:Total volumetric flow rate (Q) = 8 L/sThe molar volume of the reactants can be calculated as follows:Therefore, the number of moles entering the reactor per second:To find the number of moles of A converted to C per second, the conversion can be used as follows:Therefore, the number of moles of A that will react per second:The mass of the catalyst that will be required can be calculated as follows:Therefore, the mass of catalyst required for a 70% conversion is 9.64 Kg.

Approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².

Given:

Rate constant (k) = 0.2 L²/mol s Kg cat

Total volumetric flow rate (Q) = 8 L/s

Conversion (X) = 70%

To calculate the mass of catalyst required, we need the surface area of the catalyst. Since the surface area (S) is not provided, let's assume a value of 10 m² for demonstration purposes.

Substituting the values into the equation:

Catalyst mass = (k * 0.3² * Fa₀ * Fb₀) / (Rate constant * Surface area of catalyst)

Catalyst mass = (0.2 L²/mol s Kg cat * (0.3)² * 4 L/s * 4 L/s) / (0.2 L²/mol s Kg cat * 10 m²)

Catalyst mass = (0.2 * 0.09 * 4 * 4) / (0.2 * 10)

Catalyst mass = 0.72 / 2

Catalyst mass = 0.36 kg

Therefore, approximately 0.36 kg of catalyst is required for a 70% conversion in the given Ni-catalyzed packed-bed reactor, assuming a surface area of 10 m².

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decrease

Explanation:

We all know, Density = Mass/ volume. When volume increases and the mass remains the same , the density will decrease considerably

Answer:

The density decreases.

Explanation:

Think of a balloon. It is tied up. It has air inside. If you heat the balloon up, it expands but the amount of air inside the balloon stays the same. Therefore, there is less air per cubic millimetre, making it less dense.

you need to draw and label a flowchart and carry out a degree-of-freedom analysis of the reactor based on the extent of reaction, then calculate the total moles of gas in the reactor at equilibrium and the equilibrium mole fraction of hydrogen in the product.

If the mole fraction of hydrogen is significantly different from the calculated value, the discrepancy can likely be attributed to an imbalance between the reactants and products.

You can use a numerical method of your choice to take the input of the reactor temperature and the feed component mole fractions of CO, H2O, and CO2 to calculate the mole fraction H2 x in the product gas when equilibrium is reached.

From there, you can adjust the temperature and feed composition to maximize the yield of hydrogen.

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Answer:

2D 3D

Explanation:

can I get the options for number 4 and I’m not totally sure for number one but I would say shorter,longer

Answer:

20°C and 2 atm is correct

Explanation:

Answer:

A

Explanation:

There are three states of mater; solid liquid and gas. The sold state is the difficult to compress while the gaseous state is quite easy to compress.

A gas is easily compressed because the particles in a gas are far apart from each other. A solid is difficult to compress because the particles of a solid are close together. From all the above statements, it is easily deducible that the compressibility property of a substance in a particular state of matter depends on the proximity of the particles to each other, hence the answer above.

Answer:

C

Explanation:

because valence electrons are located at the last energy level

Element Grouping Quick Check:

1. Which element has two valence electrons?

D. calcium

2.Based on its position in the periodic table, which element would have seven valence electrons?

A. Chlorine

3. Which phrase describes a valence electron?

C. An electron in the outer energy level of an atom

4. Which phrase best describes a period on the periodic table?

A. A row of elements

5. Which two elements have the same number of energy levels with electrons in them?

A. Boron and Oxygen

Hope this helps!

5a) The maximum mass of sodium peroxide formed when 4.60 g of sodium is burnt in excess oxygen is; 7.8g of Sodium peroxide

5b) The mass of carbon that exactly reacts with 14.0g of tin(IV) oxide is; 2.23g of Carbon.

For questions (5a)

Sodium reacts with excess oxygen to form Sodium peroxide as follows;

Molar mass of sodium and sodium peroxide are 23 and 78 respectively.

Since 2 units of sodium produces one unit of sodium peroxide.

Therefore,

x = 7.8g of Na2O2

For question (5b)

Tin oxide (IV) is reduced to tin by carbon. Carbon monoxide is also formed as follows;

From stoichiometry,

By Cross-product,

x = 2.23g of carbon

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