What are SL units ? ​

The correct formula for a compound formed from the elements Al and O is Al₂O₃.

Correct option is C.

Aluminum oxide is an oxide of aluminum with the chemical formula Al₂O₃ which is primarily composed of two chemically bonded aluminum and oxygen atoms. Aluminum oxide chemical compounds exist in various forms, with the most common being alpha, gamma, and theta.

The solid compound is an odorless, white powder which is insoluble in water and is a major component of the Earth's crust. It occurs naturally as corundum, bauxite, and cryolite and can be synthetically produced through burning aluminum metal or dissolving alumina tri-hydrate.

Aluminum oxide is widely used in a variety of applications due to its unique properties such as hardness, thermal conductivity, electrical conductivity, optical properties, and chemical inertness.

Correct option is C.

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5) Convert molarity to percent, calculate moles of acetic acid, convert moles to grams, divide grams by volume in mL, multiply by 100 to obtain experimental percent, and calculate percent error.

6) Phenolphthalein could have been used as an alternative indicator.

7) When using barium hydroxide instead of sodium hydroxide, adjust the calculations by considering the stoichiometry of the reaction and using a molar ratio of 2:1 between acetic acid and barium hydroxide.

5. To calculate the percent error in the concentration of acetic acid, we need to convert our molarity (M) results to percent (%). Using the average molarity and the average volume (converted to liters) of acetic acid, we can calculate the number of moles of acetic acid.

Then, by converting moles to grams using the molar mass of acetic acid (CH3COOH), we can divide the grams of acetic acid by the average volume (in milliliters) of acetic acid and multiply by 100 to obtain the experimental percent.

Finally, we can calculate the percent error by comparing the experimental percent to the labeled percent (4% vinegar on the bottle).

6. An alternative indicator that could have been used is phenolphthalein. Phenolphthalein is commonly used in acid-base titrations and changes color in a specific pH range, indicating the endpoint of the reaction.

6. If barium hydroxide (Ba(OH)2) were used instead of sodium hydroxide (NaOH), the adjustment in calculations would involve the stoichiometry of the reaction. The balanced chemical equation for the reaction between acetic acid and barium hydroxide is:

2CH3COOH + Ba(OH)2 → Ba(CH3COO)2 + 2H2O

The molar ratio between acetic acid and barium hydroxide is 2:1. Therefore, the number of moles of barium hydroxide used would be half the number of moles of acetic acid in the calculation.

The rest of the procedure, including converting moles to grams and calculating the percent, would remain the same.

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The answer is b) -15.4kJ (note that this is the absolute value of the bond energy, as bond energies are usually reported as positive values). The first step to calculate the average N-H bond energy in NH3(g) is to use the given enthalpy of formation (Delta Hf) values to calculate the enthalpy change for the reaction:

N2(g) + 3H2(g) -> 2NH3(g)

Delta Hrxn = [2Delta Hf(NH3(g))] - [Delta Hf(N2(g)) + 3Delta Hf(H2(g))]
Delta Hrxn = [2(-46.11kJ/mol)] - [0kJ/mol + 3(0kJ/mol)]
Delta Hrxn = -92.22kJ/mol

Now, we can use the bond enthalpy concept to calculate the average N-H bond energy in NH3(g):

Delta Hrxn = (Avg. bond energy(N-H))(# of N-H bonds broken) + (Avg. bond energy(N-N))(# of N-N bonds broken) + (Avg. bond energy(H-H))(# of H-H bonds broken) - (Avg. bond energy(N≡N))(# of N≡N bonds formed) - (Avg. bond energy(H-H))(# of H-H bonds formed)

Since there are no N≡N bonds formed in this reaction, the last term can be omitted. Also, since there are three N-H bonds broken and no N-N or H-H bonds broken, the equation simplifies to:

Delta Hrxn = 3(Avg. bond energy(N-H))

Solving for Avg. bond energy(N-H), we get:

Avg. bond energy(N-H) = Delta Hrxn/3
Avg. bond energy(N-H) = (-92.22kJ/mol)/3
Avg. bond energy(N-H) = -30.74kJ/mol

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Answer:

45.5J

Explanation:

ΔT=10°C

specific heat=0.13J/g°C

mass Au=35g

heat=35g•0.13J/g°C•10°C

heat=45.5J=46J

NOTE:I apply significant figures here for the accuracy of the solution.

please rate it,Thanks.

The volume of NO produced is 20 L, 89.6 L of nitrogen reacts at STP and  89.6 L of NO can be produced from 32 g of oxygen at STP.

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

a. Volume of nitrogen = 10 L

Moles of nitrogen = Volume / 24

= 10 / 22.4 = 0.44 moles

From the reaction, 1 mole of nitrogen gives 2 moles of nitrogen oxide.

So, 0.416 moles will give 2 × 0.44 moles = 0.88 moles

Volume of nitrogen oxide = moles × 22.4

= 20 L

b. Moles of oxygen = 4 moles

1 mole of nitrogen reacts with 1 moles of oxygen.

If moles of nitrogen = 4 moles

Volume = 4 × 22.4 = 89.6 L

c. Mass of oxygen = 32 g

Moles of oxygen = mass  / molar mass

= 32 / 16 = 2 moles

1 mole of oxygen gives 2 moles of NO

So, 2 moles of oxygen gives 4 moles of NO

Volume of NO = 4 × 22.4 = 89.6 L

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a. in colder water. Cold water has higher oxygen solubility due to the inverse relationship between temperature and gas solubility.

The solubility of gases, including oxygen, in water is affected by various factors. One of the key factors is temperature. In general, the solubility of gases decreases with increasing temperature. This means that colder water can hold more oxygen in solution compared to warmer water. When water is cold, its molecules are closer together, creating a denser environment. This dense environment provides more opportunities for oxygen molecules to dissolve and stay in solution. On the other hand, warmer water molecules move more vigorously and are further apart, reducing the chances for oxygen to dissolve and stay in solution. Therefore, colder water has a greater capacity to hold oxygen in solution. This is an important factor in aquatic ecosystems as it affects the availability of dissolved oxygen for marine organisms that rely on it for respiration.

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Answer:

0.88  ⋅mol   of aluminum metal in this molar quantity of salt....

Explanation:

4LiBr + Co(SO₄)₂ ----> 2Li₂SO₄ + CoBr₄ is the balanced equation.

First write the complete equation

LiBr + Co(SO₄)₂ ----> Li₂SO₄ + CoBr₄

Now balance the given equation

LiBr + Co(SO₄)₂ ----> Li₂SO₄ + CoBr₄

Reactant Side Product side

Li= 1 Li = 2

Br = 1 S = 1

Co = 1 Co = 1

S = 2 S = 1

O = 8 O = 4

We can see that there are 8 oxygen atom in yhe Reactant side and 4 in the product side. So multiply by 2 in the product side to balance the Oxygen atoms.

4LiBr + Co(SO₄)₂ ----> 2Li₂SO₄ + CoBr₄

We can see that the given equation is now balanced.

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QUESTION: Write the complete equation and also balanced the equation.

_LiBr + _ Co(SO₄)₂ --> _ + _

Answer:

Carbon dioxide

Explanation:

that's all I can say

Answer:

a) Equilibrium shifts in forward direction.

Explanation:

If pressure is increased, equilibrium shifts to the side with the fewer moles of gas.

There are 4 moles of gas in the reactants and 2 moles of gas in the products.

The equilibrium will shift in the forward direction towards the products.

Hope that helps.

Answer:

A

Explanation:

There are various type of chemical reactions in chemistry like combination reaction, displacement reaction. One of these is the decomposition reaction. The product will remain same as 2H₂ ,  0₂ on addition of more water in the electrolysis.

Decomposition reaction is the one in which molecules breaks down in its constituent in presence of energy. Energy can be in any form, it can be light energy , heat energy.

Decomposition of water is done by providing electricity and the reaction is called electrolysis. Lysis means to break. To give decomposition reaction molecule must have more than one element. The product of electrolysis is independent of amount of water.

Therefore, the product of electrolysis will remain same.

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You retain balance when the weight and the reaction forces are balanced.

Your question is incomplete but I think you want to know how a person can retain balance.

We know that we can only be keep balance when the forces that are acting on the person is balanced. The implication of it is that there are no unbalanced forces that are acting on the person.

The two forces that act on you when you stand are the weight and the reaction force. If these two forces are balanced then you can be able to retain your balance.

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The velocity of an  object is the ratio of the distance to the time. The distance travelled by Kangaroo is 396 m in 12 seconds. So its velocity is 33 m/s.

Velocity is a physical quantity and it is the measure of distance travelled per unit time. Velocity is the rate of speed and it  is a vector quantity.The velocity can be expressed in terms of m/s, Km/hr etc.

Mathematically, velocity is the ratio of distance to the time.

Given that, distance covered by kangaroo is 396 meters.

time taken = 12 s.

therefore, velocity can be calculated as follows:

velocity = distance/time

             = 396 m / 12 s

             = 33 m/s.

Therefore, the velocity of the kangaroo is 33 m/s.

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If the chlorine level is too high, it may cause skin and eye irritation, leading to chemical burns in extreme cases. When p is the pH level and c is the chlorine level, the pH level should be between 7.4 and 7.6 pH units, and the chlorine level should be between 1.0 and 1.5 parts per million (PPM).

Pool owners and maintenance professionals must monitor two of the most important water quality indicators in swimming pools: pH and chlorine levels. These two chemicals are crucial to ensuring that the swimming pool remains a safe and healthy place to swim, and that the water is clean and clear. The pH level should be between 7.4 and 7.6 pH units, according to most water test kits.

pH levels outside this range may cause eye and skin irritation, corrosion of the pool’s surface, and an unbalanced pool. If the pH is too low, it will become acidic, causing skin and eye irritation. If the pH is too high, it can cause scaling, resulting in the formation of calcium deposits that are rough on the pool’s surface.

In general, when the pH is too low, the pool’s chlorine level can drop quickly, and when the pH is too high, the chlorine can become less effective. The chlorine level should be between 1.0 and 1.5 parts per million (PPM), according to most water test kits. Chlorine levels outside this range may cause health problems and increase the risk of waterborne illness. When the chlorine level is too low, the pool may become contaminated, resulting in bacterial growth and the spread of disease.

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From 43.9 grams of ammonia, approximately 69.76 grams of steam can be produced.

To determine the grams of steam that could be produced from 43.9 g of ammonia (NH\(_{3}\)), we need to use the balanced chemical equation for the reaction between ammonia and water vapor:

2 NH\(_{3}\)(g) + 3 H\(_{2}\)O(g) → NH\(_{4}\)OH(aq) + NH\(_{4}\)OH(aq)

From the balanced equation, we can see that for every 2 moles of ammonia (NH\(_{3}\)), 3 moles of water (H\(_{2}\)O) are produced.

1 mole of NH\(_{3}\) has a molar mass of 17.03 g, so 43.9 g of NH\(_{3}\) is approximately 2.58 moles.

Using the stoichiometry of the reaction, we can calculate the moles of water produced:

3 moles H\(_{2}\)O/2 moles NH\(_{3}\) * 2.58 moles NH\(_{3}\) = 3.87 moles H\(_{2}\)O

Finally, we convert the moles of water to grams using the molar mass of water (H\(_{2}\)O), which is 18.02 g/mol:

3.87 moles H\(_{2}\)O * 18.02 g/mol = 69.76 g of steam

Therefore, approximately 69.76 grams of steam could be produced from 43.9 grams of ammonia.

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Answer:

i think they would be all the same

Explanation:

they sound like sugars

Answer:

it is the first one

Explanation:

The solubility of silver carbonate in water is determined by the equilibrium constant, Ksp.

Silver carbonate, Ag2CO3, is sparingly soluble in water. When a solid Ag2CO3 is added to water, it dissociates into silver ions (Ag+) and carbonate ions (CO32-). The dissolution process can be represented as follows:

Ag2CO3(s) ⇌ 2Ag+(aq) + CO32-(aq)

The equilibrium constant for this dissolution reaction is denoted as Ksp. Ksp is the product of the concentrations of the dissolved ions raised to their stoichiometric coefficients. In this case, the Ksp expression is:

Ksp = [Ag+]^2 [CO32-]

The Ksp value is constant at a given temperature and represents the maximum amount of Ag2CO3 that can dissolve in water.

The options s = [Ag+], s = [CO32-], s = [Ag+]^2, and s = [Ag+][CO32-] do not correctly represent the relationship between the solubility and the concentrations of the ions. The solubility of Ag2CO3 is determined by the value of Ksp, not directly proportional to the concentration of silver ions or carbonate ions.

Therefore, the correct relationship for the solubility of silver carbonate in water is s = Ksp, where s represents the solubility of Ag2CO3.

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That would be the skeletal system, hope this helps ^^

Answer:

b and d

Explanation:

b. Hydrobromide

d. Hydrofluoric acid

An accumulation of salts due to evaporation of irrigation water is called Salinization. An accumulation of salts due to evaporation of irrigation water is called Salinization.

Salinization is the process of soil degradation in which the salt concentration of soil increases, leading to a decline in soil fertility and agricultural productivity. An accumulation of salts due to evaporation of irrigation water is called Salinization.

Salinization is caused by a variety of human and environmental factors, including irrigation, climate change, and land-use change. Salinization is one of the main causes of soil degradation and has a significant impact on global food security.

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a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.

Identification of the limiting reactant can help calculate the theoretical yield of a reaction.

Given the reaction,

2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S

Mass of aluminium sulfide = 316g

Mass of water = 493 g

Moles = Mass ÷ molar mass

Moles of Aluminium sulfide = 316 ÷ 150

=  2.10 moles

Moles of water = 493 ÷ 18

= 27.3 moles

Since moles of aluminium sulfide is less, it is the limiting reagent.

From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.

1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.

Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles

                                 = 3.15 moles of H₂S

Mass of H₂S = Moles × molar mass

                                  = 3.15 × 34 = 107.1 g

From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.

1 mole will need 3 moles of water.

Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water

Excess of water = 27.3 - 6.3 = 21 moles

Mass of excess reactant = 21 × 18 = 378g

Actual yield of  H₂S = 203g

Theoretical yield = 107.1 g

% yield = (107.1 × 100) ÷ 203 = 52.75 %

Therefore,

a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

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Answer:

H20

Explanation:

Answer:

The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide. These roadways travel in one direction only, to keep things going where they should.

In an electrochemical cell, electrochemical reactions occur at the surface of two electrodes that are immersed in an electrolyte. An electrolyte is a solution or a liquid that contains ions, which can conduct electricity.

The electrodes are usually made of different metals or metal compounds and they are connected by a wire, which allows electrons to flow between them.

During the electrochemical reaction, one electrode undergoes oxidation, losing electrons and becoming a positively charged ion, while the other electrode undergoes reduction, gaining electrons and becoming a negatively charged ion.

This results in the transfer of electrons from one electrode to the other, creating an electrical current that can be used to power devices.

Electrochemical cells are used in many applications, such as batteries, fuel cells, and electroplating. They play a crucial role in our daily lives, powering everything from our smartphones to our cars.

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The two reasons the fossil found on vega island is of particular importance to understanding the climate and location of Antarctica millions of years ago are Isotopic composition and Paleoclimate proxies

Isotopic composition: The isotopic composition of rocks and residue in Antarctica can uncover significant hints about past climate and temperature conditions.

For instance, the proportion of isotopes, for example, oxygen and hydrogen can give data about the temperature of the climate when the stone or silt was framed.

This data can be utilized to decide if Antarctica was situated in a warm or cold climate a long period of time prior and how the climate has changed over the long run.

Paleoclimate proxies: Paleoclimate proxies are indirect indicators of past climate conditions and are many times found in silt and rock deposits.

For instance, dust grains can demonstrate the sorts of plants that existed in a specific region and the climate conditions they expected to develop. Essentially, the presence of specific minerals, like calcite or aragonite, can give data about the temperature and saltiness of the water in which they are framed.

By examining these proxies, researchers can recreate past climate conditions in Antarctica and gain a superior comprehension of how the climate has changed after some time.

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Answer: The rock and soil had gravitational potential energy at the edge of the road, overlooking the river. The rain added mass and caused the rock and soil to loosen. The rock and soil gained kinetic energy as it slid down into the river.

Explanation:

Answer:

The rock and soil had gravitational potential energy at the edge of the road, overlooking the river. The rain added mass and caused the rock and soil to loosen. The rock and soil gained kinetic energy as it slid down into the river

Explanation: