* look at the photo *

1. saturated solutions of each of the following compounds are made at 20°c. circle the letter(s) of the solution(s), which will form a precipitate upon heating.
a) nacl b) na2so4 c) li2co3 d) sucrose

2. a saturated solution of potassium chloride is prepared in 100.0 g of water at 20°c. if the solution is heated to
50°c, how much more kcl must be added to obtain a saturated solution?

3. a saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20°c. what mass of rock candy will be formed?

No of moles:-

[tex]\\ \tt\Rrightarrow Molarity (Volume)[/tex]

[tex]\\ \tt\Rrightarrow 0.00045(0.7)[/tex]

[tex]\\ \tt\Rrightarrow 0.000315mol[/tex]

Mass:-

Answer: You used the Kelvin scale.

Explanation: this is because its multiplied by the temperature im not sure.

Is this a true or false question? If so, then this would be a true statement. Synthetic materials are made in factories, and the usage of factories increases the risks of harmful gases and chemicals that negatively impacts Earth.

It is generally true that as consumption of a synthetic material increases, the associated negative impacts to Earth needed to produce the material also increase.

This is because the production of synthetic materials often requires the extraction and processing of non-renewable resources, such as petroleum, which can have a range of negative environmental impacts, including habitat destruction, air and water pollution, and greenhouse gas emissions.

Additionally, the disposal of synthetic materials can also lead to environmental problems, such as the accumulation of non-biodegradable waste in landfills and oceans.

However, it is important to note that not all synthetic materials have the same environmental impacts, and some materials may be more sustainable than others depending on their production methods and intended use. Hence, the given sentence is true.

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Your question is incomplete, most probably the full question is this:

True or false. As consumption of a synthetic material increases, the associated negative impacts to Earth required to produce the material increase.

The concentration of NaOH that is used to completely neutralize is 0.25 Liters.

We will calculate the concentration in terms of molarity by using the below formula:

M₁V₁ = M₂V₂, where

M₁ = molarity of H₂SO₄ = 2m

V₁ = volume of H₂SO₄ = 0.25 L

M₂ = molarity of NaOH = ?

V₂ = volume of NaOH = 2 L

On putting all these values on the above equation, we get

M₂ = (2)(0.25) / (2) = 0.25 L

Hence required volume is 0.25 L.

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Answer:

Ginger ale is a strong acid

Explanation:

This is because of the high amounts of carbonic acid that it contains, putting it below the 4.6 Ph threshold.

Answer:

Water(H20)

Explanation:

Water is called the universal solvent because more substances dissolve in water than in any other chemical. This has to do with the polarity of each water molecule. The hydrogen side of each water (H2O) molecule carries a slight positive electric charge, while the oxygen side carries a slight negative electric charge.

Answer:

I think it is D.

Explanation:

Sry if I am wrong...

Answer:

wrinkle free

Explanation:

Apply Charles law

[tex]\\ \bf\bull\rightarrowtail V1T2=V_2T1[/tex]

[tex]\\ \bf\bull\rightarrowtail 10(20)=25V_2[/tex]

[tex]\\ \bf\bull\rightarrowtail 200=25V_2[/tex]

[tex]\\ \bf\bull\rightarrowtail V_2=8L[/tex]

Answer:

hope it's helpful to you

Answer:

The arrow would be facing upwards from the counter to the icecube.

Explanation:

Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.

An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.

It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.

In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.

Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.

Surface tension of the water  is defined as  the tendency of  the surface to resist rupture when they are subjected to stress due to cohesive forces.

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A solution in which methyl orange is red indicates the most acidic substance.

This is defined as a substance that gives a visible sign, usually by a colour change when a chemical species is added.

On litmus paper, the redder the color is, the more acidic it is which was why methyl orange changing to darker red signifies most acidity.

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Answer:

The answer is (3) 1676 kJ. The heats of reaction at 101.3 kPa and 298 K for reaction: 4Al(s) +3O2(g)= 2Al2O3(s) is -3351 kJ. So for one mole of aluminum oxide is 3351/2=1676 kJ.

Answer:

Explanation:

The volume of Hydrogen and Oxygen molecules are not the same but assuming that they are, the ratio in water which is H2O would be

(c) 2:1

Answer:

The loss of crystalline structure of sucrose was reported at various temperatures, but decomposition, after >50 h of holding at 120 °C in a sealed pan.

Explanation:

As this condition is above the melting temperature of fructose (a possible first decomposition product), and there were water and impurities.

The amount of the amino acid glycine that is found in Stan’s apparatus is more than that of murchison meteorite.

It should be noted that amino acid simply means organic compounds that contain both amino and carboxylate.

In this case, the amount of the amino acid glycine that is found in stan’s apparatus is more than that of murchison meteorite. This was depicted by the fraction of the three amino acids in the scenario.

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The actual amount of the amino acid glycine found in Stan’s apparatus is more than the amount of glycine in the Murchison meteorite.

Amino acids are the building blocks of proteins. The building blocks of life are amino acids and proteins.

In this example, the amount of glycine detected in Stan's equipment is more than that found in the Murchison meteorite. The fraction of the three amino acids in the scenario represented this.

Hence amount of amino acid is more in Stan's apparatus as compared to the Murchison meteorite.

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Answer:

84.0 g

Balanced equation: 4Fe + 3O2 --> 2Fe2O3

Find moles of oxygen:

Find mass of O2

The number of moles of each atom present in 5 moles of Cu₃(PO₄)₂ are:

The moles of atom present in 5 moles of Cu₃(PO₄)₂ can be obtained as follow

1 mole of Cu₃(PO₄)₂ contains 3 moles of Cu.

Therefore,

5 moles of Cu₃(PO₄)₂ will contain = 5 × 3 = 15 moles of Cu

1 mole of Cu₃(PO₄)₂ contains 2 moles of P.

Therefore,

5 moles of Cu₃(PO₄)₂ will contain = 5 × 2 = 10 moles of P

1 mole of Cu₃(PO₄)₂ contains 8 moles of O.

Therefore,

5 moles of Cu₃(PO₄)₂ will contain = 5 × 8 = 40 moles of O

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The number of moles of copper, phosphorous and oxygen present in the 5 moles of Cu₃(PO₄)₂ are 15, 20 and 40 respectively.

Stoichiometry of any chemical equation gives idea about the amount of species present before and after the reaction.

Dissociation reaction of Cu₃(PO₄)₂ is shown as below:
Cu₃(PO₄)₂ → 3Cu²⁺ + 2PO₄³⁻

From the stoichiometry of the equation, it is clear that:

1 mole of Cu₃(PO₄)₂ produces 3 moles of copper atom, 2 moles of phosphorous atoms an 8 moles of oxygen atom.

5 moles of Cu₃(PO₄)₂ = produces 3×5=15 moles of Cu

5 moles of Cu₃(PO₄)₂ = produces 2×5=10 moles of P

5 moles of Cu₃(PO₄)₂ = produces 8×5=40 moles of O

Hence required moles of copper, phosphorous and oxygen are 15, 20 and 40 respectively.

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Typical household bleach has a value of pH of 13, so the concentration of H₃O⁺ in household bleach is 1 × 10⁻¹³ M.

pH of any solution is defined as the negative logarithm of the concentration of H⁺ ion presnt in the solution.

pH = -log[H⁺]

From this equation we can calculate the concentration of H⁺ ion by removing logarithm as:

[H⁺] = [tex]10^{-pH}[/tex]

Given value of pH = 13

[H⁺] = 10⁻¹³ M

Hence, required concentration is 1 × 10⁻¹³ M.

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Answer:

1st blank is 1.00

2nd blank is -13

Explanation:

We can convert ketones to alkenes by the use of;

1)B2H6 in THF

2) H2O2/NaOH

A ketone is a compound of the sort RCO. The compound contains a carbon  - oxygen double bond. The ketone can be used in the synthesis of an alkene. The question is incomplete hence I can only give a general answer.

The reaction involves the following reagents;

1)B2H6 in THF

2) H2O2/NaOH

When these two reagents are applied any ketone can be converted to an alkene.

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The two-step synthesis of the alkene from the ketone using the reagents provided is

Step1: B₂H₆ in THF.

Step2: H₂O₂ / NaOH

An alkene is a hydrocarbon compound containing double bonds between carbons.

The process of making alkenes from ketones or aldehyde is called the witting reaction or witting olefination.

Thus, the two-step synthesis of the alkene from the ketone using the reagents provided is

Step1: B₂H₆ in THF.

Step2: H₂O₂ / NaOH

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Explanation:

A water fall falls and hits the base with force depending on the distance from which it fell.This force is caused by gravity pulling the water molecule as well as some other particles like eroded soil rapidly downwards.

The lewis structure of Magnesium nitride places eight electrons around N. 3 of these electrons are provided by Mg to get a stable conformation.

The Lewis structure is a representation of electron pairs in bonds between the atoms that compose the molecule. It can also show the solitary electron pairs that remain for each atom.

Electrons

When adding the valence electrons of each atom, we get the total number of electrons in the molecule.

The valence value is the number of electrons placed in the last energetic level of the atom.

The compound that forms between magnesium and nitrogen is magnesium nitride, Mg₃N₂. This is a simple salt with an ionic bond between a metal and a non-metal element.

They are elements that express a tendency to lose valence electrons to get a stable electronic configuration. When they lose electrons, they remain positively charged. These are cations with positive charges and lose the valence electrons of their last level.

Mg has 2 electrons in its last level, so to get a complete stable configuration (2e-), it needs to lose 2 electrons.

Mg has two positive charges Mg ²⁺

They are elements that gain electrons to complete their last level. These are the anions. When they get electrons, they remain negatively charged.

Because Nitrogen has 5 electrons in its last level, it needs to add 3 electrons. In this way, it gets to the complete stable configuration (8e-).

N has three negative charges N³⁻

So, to complete the Lewis structure, we need to add Mg ²⁺ and N³⁻.

We know that

According to this, N needs more than one Mg to complete its last level.

So, in our calculations, we need to have three Mg and two N.

You will find the final Lewis structure in the attached files.

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Answer: C.

Explanation:

Voluntary muscle are muscles that you can control.

Answer:

118MOLS

Explanation:

M1VI=M2V2

THE REST WORK OUT ( BA UNZA STUDENTS HE HE HE )

Answer:

Answer: C

Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.

Melamine formaldehyde is a thermosetting plastic (or thermoset) that strengthens as it is heated during its preparation.

Explanation:

The shortest bond distance is at N2 due to its high bond order of 3. From N2 to F2 the bond distance increases despite the fact that atomic radius decreases.

H₂ is the diatomic molecule or ion that has the shortest bond length.

Diatomic atoms are those atoms which are composed of two atoms that are joined by a chemical bond.

H₂ is the simplest diatomic molecule is this.

It is diamagnetic and has only two molecular orbitals (g and u), two electrons, and a bond order of one.

It has a 74 pm bond length.

Thus, H₂ is the diatomic molecule or ion that has the shortest bond length.

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Answer:

Gravitional Force

Explanation:

Every planet has a gravitational pull which attracts all objects; the moon is no exception. It says forces in the question but I know for sure gravitational force is apart of it.

Emphysema is directly linked to a reduction in the surface area available for gas exchange in the human lungs.

Emphysema is a lung disease that causes shortness of breath.

The air sacs are damaged in this disease.

The inner walls of the air sacs weaken and rupture, resulting in a larger number of smaller air spaces.

Smoking is the primary cause of Emphysema

Thus, Emphysema is directly linked to a reduction in the surface area available for gas exchange in the human lungs.

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The phosphate group attached to the 5' carbon of the sugar on one nucleotide forms an ester bond with the free hydroxyl on the 3' carbon of the next nucleotide.

The molarity of the NaCl in the 250 ml slat solution is 2.8M.

The molarity of a solution is defined as the concentration of a solute per unit volume of the solution.

Given, the volume of the solution is 250 ml converted into l 0.25

The number of moles of NaCl is 0.70.

By the formula  of molarity

[tex]M = \dfrac{n}{V}\\\\\\M = \dfrac{0.70}{0.25} = 2.8 M[/tex]

Thus, the molarity is 2.8 M.

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