If solutions of co(no3)3 and koh are mixed, how many precipitation reactions will occur?

Answer:

The chemical formula for the ionic compound is

Na3N3

The molecule that is not an example is O, which is actually an atom of oxygen. Option 2 is correct.

A molecule is a group of two or more atoms held together by chemical bonds. OF and H₂O₂ are molecules because they consist of two different atoms bonded together. O₃ is also a molecule because it consists of three atoms of oxygen bonded together.

NC₁₃ is a molecule because it consists of one nitrogen atom and thirteen carbon atoms bonded together. However, O is simply an atom of oxygen and does not consist of two or more atoms bonded together, so it is not a molecule. Option 2 is correct.

The complete question is

Which choice is not an example of a molecule?

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To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.

At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.

To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:

pH = pK a + log([base]/[acid])

where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.

At a pH of 7.0, the acid-base equilibrium of EDTA will be:

[EDTA-] = [HEDTA]

At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.

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The follows statement is not true about molecular orbitals for any substance, the number of electrons in molecular orbitals is equal to the sum of all the valence electrons on the bonding atoms. The correct answer is E.

Because the number of molecular orbitals produced is always equal to the total number of atomic orbitals combined, the claim that the amount of electrons in molecular orbitals equals the sum of all the valence electrons on bonding atoms is untrue.

When electrons are added to orbitals with the same energy, the most stable configuration is predicted by the hund's rule, and a molecule orbital can hold up to two electrons. It is true that low-energy atomic orbitals fill before high-energy atomic orbitals fill.

Your question is incomplete but most probably your full question was which of the following is not true of molecular orbitals?

a) the number of molecular orbitals formed is always equal to the number of atomic orbitals combined.

b) a molecular orbital can accommodate up to two electrons.

c) when electrons are added to orbitals of the same energy, the most stable arrangement is predicted by hund's rule.

d) low-energy molecular orbitals fill before high-energy molecular orbitals fill.

e) for any substance, the number of electrons in molecular orbitals is equal to the sum of all the valence electrons on the bonding atoms.

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In order to do this, particles were created by combining equal amounts of calcium chloride (CaCl2) and sodium carbonate (Na2CO3), with the initial salt concentrations of CaCl2 and Na2CO3 ranging from 5 10-4 to 5 10-2 M.

Calcium carbonate is utilized as a dietary supplement when the calcium intake from food alone is insufficient. For healthy bones, muscles, a neurologic system, and a heart, the body needs calcium. Calcium carbonate is also used as an antacid to treat heartburn, acid reflux, and stomach pain. Calcium carbonate has the chemical formula CaCO3. It is a chemical that frequently occurs in rocks as that of the minerals calcite & aragonite and is used as the main component of pearl, gastropod shell, eggshells, and the skeletons of shellfish. Calcareous refers to things with a high concentration of calcium carbonate or things that resemble it.

High levels of calcium in your blood might cause swelling, rapid weight gain, or symptoms like nausea, vomiting, constipation, increased thirst or urination, muscular weakness, bone pain, confusion, a lack of energy, or feeling exhausted.

Effects on Humans: Humans' eyes, noses, mucous membranes, and skin are all physically irritated by calcium carbonate dust. When calcium carbonate dust comes into contact with the eyes, it produces swelling, soreness, and redness of the eyelids, whereas when it comes into contact with the skin, it causes mild local irritation.

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Answer:

potassium is likely to be harder

Explanation:

because whenan atom loss electron they can form particle ion acquare stable a arrangement that loos electron can transfer to another which that also to acquaire stable

Since the stoichiometric ratio between Fe(NO₃)₃ and Fe(SCN)₃ is 1:1, the amount of Fe(SCN)₃ produced is also 0.02915 moles.

To find the concentration of Fe³⁺ in the solution after the other reactants are added, we need to determine the limiting reagent and calculate the amount of Fe³⁺ produced.

First, let's calculate the amount of Fe³⁺ produced from the reaction between Fe(NO₃)₃ and KSCN:

Fe(NO₃)₃ + 3KSCN → Fe(SCN)₃ + 3KNO₃

From the balanced equation, we can see that 1 mole of Fe(NO₃)₃ reacts with 3 moles of KSCN to produce 1 mole of Fe(SCN)₃.

The initial concentration of Fe(NO₃)₃ is 5.83 M and the volume used is 5.00 ml (which is equivalent to 0.00500 L). Thus, the amount of Fe(NO₃)₃ used is:

Amount of Fe(NO₃)₃ = concentration × volume

= 5.83 M × 0.00500 L

= 0.02915 moles

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Answer:

No = Avagardro's number = 6.02 x 10^23

No.of atoms = no.of moles x No x atomicity

= 75.4 x 6.02 10^23 x 1

= 453.908 x 10^23 atoms .

The correct (R) or (S) designations for stereocenter carbons are as follows: (S) is the organic substrate, and (P) is the organic product (R).

The substrate is designated as S the reaction's result as R. As a result. The SN2 reaction's mechanism can be summed up as follows: This nucleophilic substitution process only requires one step.

Due to the involvement of two reactants in the step that determines the rate, the reaction is referred to as the SN2 reaction.

The electrophile is attacked by the nucleophile in the reaction's mechanism, causing a transition phase in which the electrophile's alkyl group leaves and the nucleophile forms a new bond with the substrate that is still present.

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Answer:

The purpose of a hypothesis is to find the answer to a question. A formalized hypothesis will force you to think about what results you should look for in an experiment.

Explanation:

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It decreases it's temperature and it take about 10 hours for it to decrease

Yes buba booey

Toning is the process of immersing a positive print that has previously undergone development in a chemical solution that saturates the frame's dark regions while leaving the brighter regions practically white.

When Paul Lafitte established the production business Le Film d'Art in France at the same time (1908), it gained international recognition for its plays-to-film adaptations that starred renowned theater actors.

Early Nickelodeon era directors faced the fundamental issue that consumers did not comprehend the casual, geographical, and temporal relationships in films, leading to some debate about visual storytelling.

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Answer:

bonding conductor

Explanation:

they have bond of conductor between them.

Answer:

Nitrogen is the main component because it comprises 78% of total air while oxygen comprises 21%

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Answer:nitrogen

Explanation:

The equilibrium constant at 25 degrees Celsius for the following reaction is 474.4 kJ/mol.

The standard enthalpy change of a reaction ΔH°f describes the heat change that occurs at a constant thermodynamic standard state. It is a state function, so it can be calculated from known standard enthalpy of formation ΔH°f values. A standard enthalpy of formation for a substance represents the heat change required at a constant thermodynamic standard state, to create one mole of that substance from its constituents elements in the standard state. A similar concept exists for the standard free energy of formation ΔG°f of a substance and it is associated with the same type of formation reaction

The balanced chemical reaction is given as:

2H₂O(l) → 2H₂(g) + O₂(g)

Standard free energy of formation of liquid water is calculated as:

ΔG° = -2ΔG°

ΔG° = -2 × (-237.2 kJ/mol)

ΔG° = 474.4 kJ/mol

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Answer:

4C + S8 → 4CS2

Explanation:

Answer:

a: iron is a substance

Explanation:

because its hard and brittle and classified as a metal

Answer:

B) ATP to form ADP, releasing energy.

Answer:

It's called the proton number or atomic number

Explanation:

Elements in the periodic table are arranged in order of increasing number of protons

Answer:

nucleus

Explanation:

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

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To determine which quantity is greater between 1.01 atomic mass units (amu) and 1.01 grams of hydrogen, we need to understand the relationship between atomic mass units and grams.

Atomic mass units (amu) are a unit of mass commonly used in chemistry to describe the mass of atoms and molecules. It is based on the mass of a specific isotope of carbon, where 1 amu is approximately equal to the mass of one proton or one neutron.

On the other hand, grams (g) are a unit of mass in the International System of Units (SI). They are commonly used to measure larger quantities of substances, such as elements or compounds.

To compare these two quantities, we need to convert between amu and grams. Since 1 amu is a very small unit compared to grams, we would expect that 1.01 grams of hydrogen would be greater than 1.01 amu of hydrogen.

To make the comparison, we can use the molar mass of hydrogen. The molar mass of hydrogen is approximately 1.008 grams per mole. A mole is a unit that represents a specific number of particles, which is 6.022 x 10^23 (Avogadro's number).

Since we have 1.01 grams of hydrogen, we can calculate the number of moles by dividing the mass by the molar mass:

Number of moles = mass (in grams) / molar mass

Number of moles = 1.01 g / 1.008 g/mol ≈ 1.00 moles

Therefore, 1.01 grams of hydrogen is approximately equal to 1.00 moles of hydrogen.

On the other hand, 1.01 amu of hydrogen refers to the mass of a single hydrogen atom. Since 1 amu is very close to the mass of a single proton, which is approximately 1.007 amu, we can infer that 1.01 amu is slightly greater than the mass of one hydrogen atom.

In conclusion, 1.01 grams of hydrogen is a larger quantity compared to 1.01 amu of hydrogen. The mass of hydrogen in grams represents a macroscopic amount, while the mass in amu refers to the atomic level of a single hydrogen atom.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:

39 mol AgNO3

Explanation:

We have the equation 4HNO3 + 3Ag -----> 3AgNO3 + NO + 2H2O

We want to calculate the number of silver nitrate (AgNO3) moles that would be produced from 52 moles of nitric acid ( HNO3 )

We can calculate this by using mole ratio as well as dimensional analysis.

The mole ratio of Silver nitrate to nitric acid based on the balanced equation is 3AgNO3:4HNO3.

Using this we can create a table: The table is attached.

Breakdown of the table.

The moles of nitric acid cancel out and we multiply 52 by 3/4 to get 39 moles of Silver nitrate.

Answer:

numbers of molecules = 3×6.023×10-23

Answer:

you can find Valley Glacier in Mount Kenya

Answer:please see explanation for answers

Explanation:

Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.

Now, some of the ways we can conserve water include

1. Putting off taps while lathering the hands with soap

2.use of irrigation system to water crops and plants

3.. while brushing, make sure to turn off the tap or faucet

4. use a shower rather than a bath

The term mole concept is used here to determine the mass of NaOH produced. The mass of NaOH produced from  1.724 g of Na is 3. 0g. The correct option is A.

One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The equation used to calculate the number of moles is:

Number of moles (n) = Given mass / Molar mass

Here molar mass of Na = 22.99 g/mol

'n' of NaOH = 1.724 / 22.99 = 0.0749 mol

The ratio of moles of 'Na' to NaOH is 2 : 2

So the number of moles of 'NaOH' = 0.0749 mol

So the mass of NaOH = 0.0749 × 40.00 = 2.99 g ≈ 3 g

Thus the correct option is A.

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The pH at the equivalence point of titration of the 26.1 mL sample of the 0.496 M of the aqueous hydrocyanic acid solution is 0.70.

The chemical equation for the titration is :

HCN + KOH --> H₂O + KCN

The moles of the HCN = 0.496 x 0.0261

The moles of the HCN = 0.010 moles of HCN = moles of the KOH at the equivalence point = 0.010/ 0.331

                               = 0.0246 L of KOH

At the equivalence point,

The molarity of the solution =  0.010/(0.0261 + 0.0246)

The molarity  of the solution = 0.199 M

pH = - log(0.199)

pH = 0.70

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