The following is a procedure that was theoretically performed by a student. Read through the procedure and answer the questions below.1.A 10.0 mL graduated cylinder to measure 10.0 mL of a 1.00 M CaCl2 solution into an initially empty 50.0 mL beaker.2.A 50.0 mL graduated cylinder was then used to measure out 25.0 mL of 0.500 M K2CO3. This K2CO3solution was then added to the beaker containing the CaCl2 solution. The solution became cloudy, and the student concluded that a precipitate must have formed. Write a balanced chemical reaction below, including phases, and identify the chemical formula of the precipitate:

The moles of HNO₃ produced from the reaction of 81.0 g of NO₂ with excess water in the chemical reaction is 1.17 moles.

The balanced chemical reaction is -

3 NO₂(g) + H₂O(l) → 2 HNO₃(g) + NO(g)

First step is to calculate moles of NO₂ -

Number of moles = Given mass

                                 Molar mass

Moles of NO₂ = 81.0 g = 1.76 moles of NO₂

                          46.0 g

We have,

mass of NO₂ = 81.0 g

moles of NO₂ = 1.76 mol

So,

3 moles of NO₂ is required to make 2 moles of HNO₃

1.76 moles of NO₂ is required to make 2 x 1.76 moles of HNO₃

                                                                3

Moles of HNO₃ = 2 x 1.76 = 1.17 mol

                             3

Therefore,

moles of HNO₃ produced by the reaction of NO₂ with excess water is 1.17 moles.

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Answer:

this the partial removal of a substance from a solution or mixture by dissolving it in another immiscible solvent in which it is more soluble.

The Atoms that contain single bonds are sp3 hybridized while atoms that contain double bonds are sp2 hybridized.

The term hybridization as acquaint by Linus Pauling is used to explain the idea of mixing atomic orbitals of appropriate energy to obtain hybrid orbitals that are suitable for chemical bonding.

the process of an animal or plant breeding with an individual of another species or variety.

Carbon atoms can be:

1. sp3 hybridized (single bonds)

2. sp2 hybridized (double bonds)

3. sp hybridized (triple bonds)

In this case, carbon 1 is doubly bonded hence it is sp2 hybridized. Carbon 2 is singly bonded hence it is sp3 hybridized.

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0.6066 moles of water are produced by complete ammoxidation of 145 g of o-xylene.

Number of moles are calculated by dividing the mass by the molar mass of the substance.In the reaction between o-xylene ,ammonia and oxygen pthalonitrile  is produced.

Here, the number of o-xylene is calculated by the above mentioned formula which is 1.365 moles.Then, as per stoichiometry and balanced chemical equation ,

1.365 moles of o-xylene×8 moles of water/1 mole of xylene ×18 g water

=0.6066 moles

Thus,0.6066 moles of water are produced from 145 g of o-xylene.

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Answer:b

Explanation:i just did it

Answer:

Ok

Explanation:

answer should be 1.4 cm³

1 L = 10 and so

dL = 100 and then

cL = 1,000

mL = 0.001 m³

1 m³ = 1,000

dm³ = 1,000,000

cm³ = 1,000,000,000

mm³ = 1,000 L

So, 1 mL = 1 cm³ = 0.001 L = 0.1 cL

1,400 mL = 1,400 cm³ = 1.4 L = 140 cL

Answer:

1.4 cm^3

Explanation:

Scientific research in the 1800s revealed that the rate of infection in surgery patients drastically decreased when antiseptics were used to clean wounds before procedures. It benefited society because it improved humans' understanding of

how infections spread.

In our day to day life, various different types and unknown diseases we are facing. This can be due to change in our activities or by using harmful chemicals in industries or may be due to experimental activities in laboratory.

If we use antiseptic before the procedures to clean wounds, it kill the bacteria and other virus and make it clean. This protect us from the upcoming harmful effects of uncleaned wounds.

So, it make us a step towards the healthy and wealthy life.

Thus, we concluded that using antiseptics to clean wounds before procedures. It benefited society because it improved humans' understanding of

how infections spread.

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Answer:

All compunds are molecules, but not all molecules are compounds.

Explanation:

Not all molecules are made of compounds because some molecules only have one element, of only one type of atom.

Answer:

It sounds like the writer's experiences of scouting have had a profound impact on his life. He values the connection with nature and the skills he learnt, as well as the importance of preserving the environment for future generations. He also mentions the words and phrases associated with scouting, which he says can act as a reminder of the experience and the joy he felt during his time in the Scouts. It's clear that the writer values the experiences of scouting and has a strong appreciation for the outdoors.

Answer:

The  percentage is    % \(Fe^{2+\)   \(= 57.3\)%

Explanation:

From the question we are told that  

       The volume of blood in the human body  is  \(V = 5.0 0 \ L\)

       The  concentration of  \(Fe^{2+\) is  \(C_{F} = 1.10 *10^{-5} \ M\)

        The volume  of  NaCN  ingested is  \(V_N = 9.00 \ mL = 9.00 *10^{-3} \ L\)

       The concentration of  NaCN ingested is  \(C_N = 21.0 \ mM = 21.0 *10^{-3} \ M\)

The  number of moles of   \(Fe^{2+\) in the blood is  

                    \(N_F = C_F * V\)

substituting values  

                    \(N_F = 1.10 *10^{-5} * 5\)

                    \(N_F = 5.5*10^{-5} \ mols\)

The  number of moles of  \(CN^{-}\) ingested is  mathematically evaluated as

           \(N_C = C_N * V_N\)

substituting values    

          \(N_C = 21*10^{-3} * 9 *10^{-3}\)

          \(N_C = 1.89 *10^{-4} \ mols\)

The balanced chemical equation for the reaction  between   \(Fe^{2+\) and   \(CN^{-}\)  is  represented as

          \(Fe^{2+} + 6 CN^{-} \to [Fe(CN)_6]^{2-}\)

From this  reaction we see that  

         1 mole  of    \(Fe^{2+\)  will react with 6  moles of  \(CN^{-}\)

=>         x  moles of  \(Fe^{2+\) will react with   \(1.89 *10^{-4} \ moles\) of  \(CN^{-}\)

Thus  

         \(x = \frac{1.89 *10^{-4} * 1}{6}\)

        \(x = 3.15 *10^{-5}\)

Hence the percentage  of  \(Fe^{2+\)  that reacted is  mathematically evaluated as

       %  \(Fe^{2+\)   \(= \frac{3.15 *10^{-5}}{5.5*10^{-5}} * 100\)

        %  \(Fe^{2+\)   \(= 57.3\)%

The pH of the solutions are as follows:

a. pH = 4.4

b. pH = 0.2

The pH of a solution is a measure of the acidity or basicity of a solution.

The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

pH = -log [H⁺]

where [H⁺] is the hydrogen ion concentration

The pH of the solutions are as follows:

a.  150.0 ml of a 3.5 x 10⁻⁵ M HNO3.

pH = -log (3.5 x 10⁻⁵)

pH = 4.4

b. 250.0 ml of a 0.63 M solution of HNO2

pH = -log (0.63)

pH = 0.2

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The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

Answer:

E, and H

Explanation:

they are opinions, not facts

Answer:

False

Explanation:

Redox reaction is defined as the chemical reaction that includes both reduction and oxidation of atoms through the transfer of electrons between two reactants participating in it.

The given chemical equation: NaNO2 + HCl —> NaCl + HNO2 is a double displacement reaction and not a redox reaction because there is no change in the oxidation number of two of the atoms in the reaction. While the reactant ions exchange places to form new products through double displacement reaction.

Hence, the given equation is not a redox reaction but a double displacement reaction.

The reaction NaNO2 + HCl —> NaCl + HNO2 is not a redox reaction.

A redox reaction is a reaction in which there is a change in the oxidation number of the reactants from left to right. Hence, in a redox reaction, the oxidation number of species either increases or decreases as we move from left to right.

In the reaction NaNO2 + HCl —> NaCl + HNO2, the oxidation number of each specie remains the same from left to right hence, it is not a redox reaction.

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Answer:

the temperature increased

The statement that describes the law of conservation of energy is Energy cannot be created nor destroyed, but it changes from one form to another.

This statement reflects the principle of the law of conservation of energy, also known as the first law of thermodynamics. According to this law, the total energy of an isolated system remains constant over time. Energy may change from one form to another (such as potential energy to kinetic energy or thermal energy to mechanical energy), but the total amount of energy within the system remains unchanged.

This law is based on the principle that energy is a fundamental property of nature and that it is conserved in all processes. It applies to various systems, from microscopic particles to large-scale systems like the universe.

The law of conservation of energy is a fundamental principle in physics and has broad implications for understanding and analyzing various phenomena and processes, including chemical reactions, mechanical systems, and thermodynamics.

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The true statement  for the quantum mechanical atomic model is that Electrons give off electromagnetic radiation when they jump from a high to a low energy level.

Option c is correct.

The quantum mechanical atomic model, also known as the wave mechanical model, describes the behavior of electrons in atoms as waves.

This model described that only electrons can exist only in certain discrete energy levels around the nucleus. When an electron absorbs energy, it moves to a higher energy level.

In other words, when it loses energy, it moves to a lower energy level.

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Answer:

Aluminum even after being an active metal is used as a structural metal due to its toughness, high strength, lightweight, and resistance to the process of corrosion. It is resistant to corrosion as its reactivity gets suppressed due to the formation of an aluminum oxide film which is protective in nature, on its surface. Passivation is the term for the formation of the protective coating.

The type of compound represented by the graph at right is a strong acid (option B).

An acid is generally any compound capable of dissociating into its respective constituent ions when in an aqueous solution.

An acid is categorised as strong or weak depending on whether it can dissociate completely or partially. A strong acid dissociates completely in water.

According to this question, HA, when added to water, dissociates into H+ and A- ions, hence, is a strong acid.

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The learning activities titled "Hypothesis," "Variables and Hypothesis," and "Constructing a Hypothesis" all share certain similarities and differences. A question that arises in response to an observation is similar to a scientific research question in that both require some level of investigation to achieve an answer. However, scientific research questions are typically more specific and refined, with a defined methodology for obtaining data and verifying results.

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Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

Thus, They are additionally known as limiting reactants or limiting agents. A predetermined quantity of reactants are necessary for the reaction to be completed, according to the stoichiometry of chemical reactions.

In the aforementioned reaction, 2 moles of ammonia are created when 3 moles of hydrogen gas react with 1 mole of nitrogen gas.

In most cases, this reactant dictates when the reaction will end. The reaction stoichiometry can be used to determine the precise quantity of reactant that will be required to react with another element. The limiting agent is determined by the mole ratio rather than the mass of the reactants.

Thus, Reagents that are entirely consumed by a chemical reaction are known as limiting reagents.

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To convert grams of Fe₂O₃ to grams of Fe, we can use the balanced chemical equation for the reaction between Fe₂O₃ and CO.

The balanced equation for the reaction between Fe₂O₃ and CO is: Fe₂O₃(s) + 3 CO(g) → 2Fe(s) + 3 CO₂(g)

From this equation, we can see that 1 mole of Fe₂O₃ reacts with 3 moles of CO to produce 2 moles of Fe and 3 moles of CO₂. This means that the ratio of Fe to Fe₂O₃ is 2:1.

The conversion factor between grams of Fe₂O₃and grams of Fe is:

1 mole Fe₂O₃= 159.69 g Fe₂O₃

1 mole Fe = 55.845 g Fe

Steps:

Start with the given mass of Fe₂O₃in grams

Convert grams to moles of Fe₂O₃using the molar mass of Fe₂O₃ (159.69 g/mol)

Use the stoichiometry ratio of 2:1 to find the number of moles of Fe produced from the number of moles of Fe₂O₃

Convert the number of moles of Fe to grams using the molar mass of Fe (55.845 g/mol)

In conclusion, in order to convert grams of Fe₂O₃to grams of Fe, we used the balanced chemical equation to identify the molar ratio between the reactants and products.

Then, we used the molar mass of Fe₂O₃ and Fe to convert between moles and grams. It is important to be aware of the stoichiometry of the reaction in order to calculate the correct number of moles of Fe produced.

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The complete question is:

Convert grams of Fe₂O₃ to grams of Fe. Mention the correct units and conversion factors for each step.

Fe₂O₃(s) + 3 CO(g) → 2Fe(s) + 3 CO₂(g)

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The chemical formula of a combination that provides the quantities (ratios) of the elements contained in the complex but not the actual numbers or order of atoms is known as an empirical formula. This would be the elemental compound's lowest whole integer percentage.

The empirical formula of a chemical substance in chemistry is the simplest whole number quantity of atoms contained in the product. [1] As an illustration, the empirical formula of sulfur monoxide, or SO, is merely SO, as is the empirical formula of disulfur dioxide, S2O2.

Thus, sulfur monoxide and disulfur dioxide, both sulfur and oxygen molecules, have the same empirical formula. Their molecular formulas, which describe the amount of atoms in each molecule of a chemical substance, are, however, not identical.

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Answer:

2

Explanation:

Answer:

There needs to be 2 Na atoms and 1 O atom to form Na2O.

Explanation:

If you go to see the periodic table to review the oxidation states of elements, you can see that Na only has +1 as oxidation state, and O only has -2 as oxidation state.

The algebraic sum of these oxidation states in a neutral compound (not ions) must be zero, so let's apply the following technique to form the compound:

So the compound would be Na2O, so we need 2 atoms of Na, and 1 atom of O.

The answer would be: There needs to be 2 Na atoms and 1 O atom to form Na2O.

A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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Answer:

the answer is copper pipe

Answer:

Gas

Explanation: