Which element has six valence electrons?
(1 point)

lead (Pb)
phosphorus (P)
oxygen (O)
carbon (C0

In a liquid-liquid extraction (LLE) system with loratadine and pseudoephedrine sulfate, the choice of organic and aqueous phases is crucial for efficient separation.

Loratadine is a non-polar compound, while pseudoephedrine sulfate is more polar due to the presence of a sulfate group. To achieve effective separation, we need to choose a suitable organic phase and aqueous phase.

For the organic phase, a non-polar solvent such as diethyl ether, ethyl acetate, or chloroform can be used. These solvents have good solubility for loratadine. The non-polar organic phase will extract loratadine from the mixture, allowing for separation from the aqueous phase.

As for the aqueous phase, we need to choose a polar solvent that will selectively extract pseudoephedrine sulfate. Aqueous solutions of acids like hydrochloric acid (HCl) or sulfuric acid (H2SO4) can be used. The acidic conditions protonate the pseudoephedrine sulfate, making it more soluble in the aqueous phase.

To perform the extraction, the mixture of loratadine and pseudoephedrine sulfate is added to the LLE system consisting of the organic phase (non-polar solvent) and the aqueous phase (acidic solution). The mixture is then vigorously shaken to ensure thorough mixing and extraction.

After shaking, the phases are allowed to separate, with the more dense aqueous phase settling at the bottom and the less dense organic phase on top. The layers can be carefully separated, and each phase can be further processed to isolate the desired compounds.

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Answer:

D. 238 94 pu

Explanation:

Answer:

D

Explanation:

Ap3x

Answer:

Magnesium Flouride is a ionic compound and thus has a giant lattice structure. Its ions are held together in this lattice by strong electrostatic forces of attraction. A large amount of energy is needed to overcome the strong electrostatic forces of attraction between the Mg2+ ions and the F- ions to separate the ions. Hence Magnesium fluoride has a very high melting point.

The water retained by some salts when isolated by evaporation is called water of hydration. Salts that contain water of hydration are called hydrates.

Water of hydration is also called water of crystallization. It is the water that remains inside the framework of the salt or crystal after evaporation and can only be removed by heating, but by doing this, one risks losing the structure of the crystal.

An example of a hydrate is copper tetraoxosulphate (VI). When hydrated, it becomes copper tetraoxosulphate (VI) pentahydrate. When it is without its water of hydration, it has a white colour but when it is hydrated, it is blue in colour.

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Answer:

6782 has 4, 26.2 has 3, 0.3491 has 4 and 55 has 2 significant figures .

Answer:

6 g

Explanation:

The balanced equation for the reaction is:

CH4 + 2O2 → CO2 + 2H2O

Using the balanced equation, we can see that 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2 and 2 moles of H2O.

We first need to calculate the number of moles of water produced:

20.0 g H2O × (1 mol H2O/18.015 g H2O) = 1.11 mol H2O

Since 1 mole of CH4 produces 1 mole of CO2, we know that the number of moles of CO2 produced is also 1.11 mol.

Now we can use the molar mass of CO2 to convert moles to grams:

1.11 mol CO2 × (44.01 g CO2/1 mol CO2) = 48.85 g CO2

Therefore, the mass of CO2 produced in the reaction is approximately 6 g.

The browning of sugar (Step 2) is a chemical change. The process of browning sugar is known as caramelization.

It is the process of browning carb products by dehydrating, heating on the fire. In this process, carbohydrates are broken down.

During caramelization, several products are formed such as caramelan   and caramelin.

During the browning of sugar, the sugar reacts with oxygen to form new products.

Therefore, In the Step 2 the browning of sugar is a chemical change.

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Answer: The answer is C- comets!                                                                            

Explanation:  Callisto is composed mainly of rock and water ice, although other ices like ammonia ice and carbon dioxide ice may be present. Water ice occurs at the surface of Callisto so it would be comets.

Answer:

i dont know why a, i here

Explanation:

Answer:

C

Explanation:

APEX

the conclusions of an scientific experiment tell why the data support or reject the hypothesis. Thus option C is correct.

Scientific experiment involve asking different scientific questions, making hypothesis, design experiment, result and conclusion.

A good scientific experiment should have some facts which can be answered by using data analysis.

The types of scientific questions are Verification questions, Theory questions, Experimental questions

The verification question can be solved by collecting data from observation, which include characteristics or properties of a subject.

A theory question refers an imaginative exercise, is not fictional, depend on prior knowledge of the phenomenon being asking about.

The scientific question or an experimental question used to compare the element of a system when altered, it involves variables such as independent, dependent and controlled variables.

Thus option C is correct.

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If I use a plastic comb and run it "vigorously" through my hair, then hold it next to small torn pieces of tissue paper then paper will get attach to the comb.

Static electricity is a kind of electricity which will observe when transfer of charged particles is observed from one object to another object.

If we use a plastic comb and run it vigorously through our hairs then static electricity is generated due to the transfer of electrons from the atoms present in the hairs towards the plastic comb as a result of which negative charge is bear by the comb and positive charge is bear by the hairs. Then when we hold this comb near a tissue paper then it produces induced charge and show attraction towards the tissue paper.

Hence, when we hold a combed plastic comb near tissue papers then paper will get attach to the comb.

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Answer: Copper sulfate is also called blue vitriol, Roman vitriol, Salzburg vitriol, blue copperas or bluestone, which is an inorganic or chemical compound comprised of Copper, Sulphur and Oxygen.  It is an odorless crystalline substance, electric blue and highly toxic, which is produced in industries by treating the copper metal with hot concentrated sulfuric acid or treating its oxides with dilute sulfuric acid. It can be produced by slowly leaching low-grade copper ore in air and bacteria may be used to hasten the process.

Metallic character and first ionization energy are inversely related. As the metallic character of an element increases, it's first ionization energy decreases.

Metallic character refers to the ability of an element to exhibit metallic properties, such as conductivity and malleability. It is primarily determined by the ease with which an atom can lose its outermost electrons. First ionization energy, on the other hand, is the energy required to remove the outermost electron from an atom in its gaseous state.

The relationship between metallic character and first ionization energy can be explained by the arrangement of electrons in an atom. Elements with high metallic character tend to have a large number of valence electrons that are loosely held, allowing them to be easily removed. These elements have a low first ionization energy since the energy required to remove an electron is relatively low.

In contrast, elements with low metallic character have a stronger attraction between the nucleus and valence electrons, resulting in higher first ionization energy. Therefore, as the metallic character of an element increases, it's first ionization energy decreases. This relationship is observed across the periodic table, where metals generally have low first ionization energies and high metallic character, while nonmetals have high first ionization energies and low metallic character.

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Answer: This reaction will not occur, therefore it cannot be balanced.

Only certain metals reactive enough are able to replace a hydrogen on an acid. This only occurs if the metal is higher on the activity series than hydrogen. In this case Copper is not higher than Hydrogen on the activity series, thus it cannot replace the hydrogen. Meaning No Reaction.

The mole ratio of CO2 to O2 is 2:3 This means that for every 2 moles of CO2 produced, 3 moles of O2 are consumed in the reaction.

The balanced chemical equation for the reaction C24 + 3O2 → 2CO2 + 2H2O tells us that 3 moles of O2 are required to react with 1 mole of C24. This ratio can be simplified to 2 moles of CO2 produced for every 3 moles of O2 consumed.

In summary, the mole ratio of CO2 to O2 in this reaction is 2:3, meaning that the amount of CO2 produced is proportional to the amount of O2 consumed in a ratio of 2:3.

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heterogeneous, because it does not have a uniform texture

hope That helps

Answer:

Heterogenous, I just took the quiz

Explanation:

Explanation:

Volume of solid metal = 102.6ml - 100ml = 2.6ml.

Mass of solid metal = 50g.

Density = Mass / Volume = 50g / 2.6ml = 19.2g / cm³.

Also from our knowledge, only gold metal is yellowish here.

Hence the answer is gold metal.

Answer:b

Explanation:

Answer:

True

Explanation:

Answer:

350.34

PubChem CID61644

Formula: Cl3CrO12

Explanation:

Answer:

The correct option is;

d. Explicit knowledge

Explanation:

Explicit knowledge is the knowledge that can be easily articulated documented stored in a retrieval system accesses, transmitted and shared with others

Tacit knowledge is the skill developed by an individual based on actual experience such that such knowledge comprise of both facts and perspectives

Hence explicit knowledge and tacit knowledge are complementary

The operations performed by Kaia include documentation, storing in a retrieval system (her project report) and accessing what she documented, this is an example of explicit knowledge.

Answer:

3 sometimes 4

Explanation: there are usualy

3 layers of paint but sometime manufacterers add paint protection film to bring the total up to 4

The dissociation of strontium sulfate (SrSO₄) in water can be represented by the following equation: SrSO₄ (s) ⇌ Sr²⁺ (aq) + SO₄²⁻ (aq)

In this equation, the solid strontium sulfate (SrSO₄) dissociates into its respective ions: the strontium cation (Sr²⁺) and the sulfate anion (SO₄²⁻). When the compound is placed in water, it dissociates into its ions, which are now in the aqueous phase, represented by the (aq) notation. The double arrow (⇌) indicates that the dissociation is a reversible process, meaning that the ions can recombine to form the original compound.

The extent of dissociation depends on the solubility of strontium sulfate in water, which is relatively low. This means that only a small amount of SrSO₄ will dissolve in water, while the majority of it remains undissolved as a solid. The solubility product constant (Ksp) can be used to quantify the solubility of sparingly soluble salts like SrSO₄. It is defined as the product of the equilibrium concentrations of the constituent ions raised to the power of their stoichiometric coefficients. For SrSO₄, the Ksp expression can be written as:

Ksp = [Sr²⁺] [SO₄²⁻]

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Answer:

Dilute

Explanation:

A concentrated solutions is a one which has relatively large amount of dissolved solute in the solution whereas a dilute solution is a one which has relatively lower concentration of dissolved solute.

In the given solution there is only 3.3% of solute. So, we can say that the given solution is a dilute solution. However, these terms are relative.

Answer:

Yes

Explanation:

Answer:

flow of electrons in a circuit or electrical system.

more a electrical system

Explanation:

An electric current  is it

Li3N Chemical equation, 3Li+ + N3 – → Li3N 1. Furthermore, What happens when strontium reacts with nitrogen?, Strontium react with nitrogen to produce strontium nitride. This reaction takes place at a temperature of 450-500°C.

Fe2+ + MnO4- --> Fe3+ + Mn2+ (acidic conditions):

Balanced equation: 5Fe2+ + MnO4- + 8H+ --> 5Fe3+ + Mn2+ + 4H2O

To balance this equation in acidic conditions, we start by assigning oxidation numbers. Fe2+ has an oxidation number of +2, and MnO4- has an oxidation number of +7. Fe3+ has an oxidation number of +3, and Mn2+ has an oxidation number of +2. By using coefficients, we balance the equation. We add 5Fe2+ to account for the 5 Fe3+ formed and multiply MnO4- by 5 to balance Mn2+. We also add 8H+ to balance hydrogen atoms and 4H2O to balance oxygen atoms.

Cr2O72- + Fe2+ --> Cr3+ + Fe3+ (acidic conditions):

Balanced equation: 6Fe2+ + Cr2O72- + 14H+ --> 6Fe3+ + 2Cr3+ + 7H2O

In this equation, Cr2O72- has an oxidation number of +6, and Fe2+ has an oxidation number of +2. Cr3+ has an oxidation number of +3, and Fe3+ has an oxidation number of +3. We balance the equation by adding 6Fe2+ to match the 6Fe3+ formed and multiply Cr2O72- by 2 to balance Cr3+. We also add 14H+ to balance hydrogen atoms and 7H2O to balance oxygen atoms.

Al + OH- --> AlO2- + H2 (basic conditions):

Balanced equation: 2Al + 2OH- + 2H2O --> 2AlO2- + 3H2

When balancing this equation under basic conditions, we assign the oxidation number of 0 to Al and -2 to OH-. AlO2- has an oxidation number of -1, and H2 has an oxidation number of 0. To balance the equation, we multiply Al by 2 to match the 2AlO2- formed. We also add 2OH- and 2H2O to balance the oxygen and hydrogen atoms. Finally, we add 3H2 to balance the hydrogen atoms.

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Answer: 2.)black

3.)red

4.)yellow

5.) I don't know I am very sorry

6.) I don't know I am very sorry

7.) light blue

8.) purple

9.) dark green

10.)purple