The hydrate compound c u s o 4 ⋅ 5 h 2 o is blue in color, while the dehydrated form of copper sulfate c u s o 4 is white. What procedure do you think could be used to convert the pentahydrate form to the dehydrated form?.

For the reaction c2h6(g)=c2h4(g) h2(g) deltah= 137kj/mol and deltas= 120j/k. this reaction is spontaneous.

A spontaneous reaction is one that favours the creation of products under the reaction's current conditions.

A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat).

Exothermic reaction: This is a reaction when there is a decrease in the enthalpy.

At high temperatures, the reaction is spontaneous when both H and S are positive.

Let's take that back;

ΔG = ΔH - TΔS

Therefore, the reaction is spontaneous at high temperature when both H and S are positive.

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Answer:

3:2:6

There's 3 Beryllium atoms, 2 Aluminum atoms, and 6 Trioxidosilicate atoms.

The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.

Some substances are either bigger or smaller than atoms. Examples of chemical species which are not commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles.

Atoms make up molecules and compounds, however they are not actual atoms. The molecules and compounds salt, water, and methanol are examples of. Ions are the name for electrically charged atoms.  The ratio of atoms of each element in beryllium aluminium silicate, the ratio of Be: Al: Si:o : 3:2:6:18.

Therefore,  the ratio of Be: Al: Si:o : 3:2:6:18.

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The % by mass of KCl in the original mixture is 40%

Given:

Mass of AgCl, m = 5.52g

Molar mass of AgCl, mm = 143.32g/mol

Mass of sample mixture, ms = 2.42g

Molar mass of KCl = 74.5513g/mol

To find:

Mass of KCl = ?

Formula:

Mass of KCl = no. of moles x molar mass

% = Mass of KCl / Mass of sample mixture x 100

Calculations:

n AgCl = 5.52 / 143.32 = 0.039 mols

Since Moles of AgCl = 1 mole from 1 mole of KCL and 2 moles from 1 mole of MgNO3

1 mole of KCl forms 1/3 mole of AgCl

Therefore,

No. of moles of AgCl formed from KCl = 1/3 x 0.039 = 0.013 mols

Mass of KCl = 0.013 x 74.5513 = 0.969g

% = 0.969 / 2.42 x 100 = 40%

Result:

The % by mass of KCl in the original mixture is 40%.

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The complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy

The complete combustion reaction of the naphthalene is given below;

Naphthalene+ oxygen → carbondioxide + water + energy

This reaction takes place and the reason behind this is that the naphthalene combustion involves a simple burning reaction in which the simple burning procedures are present.

Naphthalene also with oxygen will burn and in the result of which carbon dioxide and water will produce.

So we can conclude that the complete combustion reaction of the naphthalene is that Naphthalene+ oxygen → carbondioxide + water + energy.

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Answer:

.

Explanation:

When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.

A chemical reaction is defined as when one or more substances (reactants) form a new substances ( product ).

When ice melts  and changes to water , there will be no new substances is form. water is made up of H₂O and ice is also made up of H₂O.  its just a change in the state , solid to liquid. Physical change are the change in which only physical properties of matter changes and no new substances is formed. so, in case of ice to liquid only the change in physical properties changes and physical change is a temporary change . we can turn water to ice by freezing.

Thus, When water (H₂O) melts and changes its state from ice to liquid is not a example of chemical reaction .it a example of physical change.

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Answer:

C. the car is moving slowly

The Sr-92 isotope, when bombarded with bismuth-209, would yield two neutrons and an isotope with atomic number 121 and mass number 299

When it comes to nuclear research, there are always new isotopes and elements being created. The Sr-92 isotope is one of the latest discoveries, and it has the potential to change the game when it comes to nuclear power.

When this isotope is bombarded with bismuth-209, it yields two neutrons and an isotope with an atomic number of 121 and a mass number of 299. This is a huge breakthrough because it could potentially be used to create a new form of nuclear power.

There is still a lot of research that needs to be done in order to make this a reality, but the potential is there. It will be interesting to see how this develops in the coming years.

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The ph of solutions 8 is 4.75 and the PH of solution 9 is 9.25.

The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.

Now,

CH3COOH + NaOH  ->  CH3COONa + H2O

pH = p Ka + log [CH3COONa] /[снз соон]

4.15 +( log 0.10m x 5 mL/ (0.1 Mx 10 mL) - (0.10 x5))

pH= 4.75

Calculated value is less than experimental value.

For solution 9:

NH4NO3 + NaOH ->  Na No3 + H2O + NH3

pH = P ka + log( [NH3] [NH4+])

= 9.25 + log ((0.10Mx5 mL) (0.1M x 10.0 mL -0.10 mx 5.0ml).

PH = 9.25

Calculated value is less than experimental value.

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6.701×10²¹moles of precipitate of iron hydroxide are formed.

Number of moles can be calculated using molar mass and Avogadro's number. The formula of which is,

number of moles=1/molar mass×Avogadro's constant

In the question given , by carrying out the reaction between iron nitrate and sodium hydroxide a precipitate of iron hydroxide is going to be formed.

The moles of iron hydroxide can be calculated by substituting the values in the formula,

1/89.86×6.022×10²³=6.701×10²¹ moles.

Hence,6.701×10²¹ moles of precipitate is formed.

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I think it should be C. Cu and Ag since they are both in the same group of the periodic table, meaning that they have similar properties.

Moles = mass / molar mass

molar mass of retinol is 286.459 g/mol.

moles = 0.125/ 286.459

moles = 0.00043

A chemical compound's molar mass is calculated by dividing its mass by the amount of the compound present in the sample, which is given as the number of moles in the sample and measured in moles. A substance's molar mass is a bulk characteristic rather than a molecular one. The molar mass of the substance is an average over many samples, which frequently have varying values due to isotopes. The molar mass is most usually estimated using the standard atomic weights and is a function of the relative abundance of the isotopes of the constituent elements on Earth.

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Answer: 4.36x10^-4 mol

Explanation:

The reaction is single displacement reaction you may have seen bubbles of gas forming during the redox reaction

This bubbles are due to the side reaction between leftover aluminum wire and acid (H⁺) ion formed by the hydrolysis of copper ion in this reaction single displacement reaction are seen here a single displacement reaction or single replacement reaction or exchange of reaction in which element is replaced by another in a compound and in this reaction redox reaction are seen means oxidation and reduction takes place simultaneously called redox an balanced net ionic reaction that occurs between aluminum metal and acid ions are

Al⁺ + H⁻ in that Al is oxidized and H ion is reduced element in that reaction

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This molecule is called tert-butyl alcohol, also known as tert-butanol and 2-methyl-2-propanol (IUPAC nomenclature).

All carbon atoms are [tex]sp^{3}[/tex] hybridized. The oxygen atom has the same hybridization, with two of the orbitals being taken by the nonbonding electron pairs, and two by the C-O and the O-H bond.

Tert-butanol is a commonly used polar organic solvent, with a boiling point of 83 degrees Celsius and a density of 0.775 g/mL. Because it has an unusually high freezing point (26 degrees Celsius), pure tert-butanol is often solid at room temperature.
It is colorless, but has a characteristic camphorous smell, and is very miscible with water (dry tert-butanol is usually obtained through distillation over potassium or sodium).

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The values of the Graduations for A , B and C will be  0.2 ml,  2ml and 1ml respectively.

Graduated Cylinder - A popular piece of scientific equipment used to measure the volume of a liquid is a graduated cylinder, sometimes referred to as a measuring cylinder or mixing cylinder. Its form is slender and cylindrical. Each marked line on the graduated cylinder indicates the volume of liquid that has been measured.

The clear graduated cylinder is widely used for volume measurements and is regarded to be more accurate than a beaker since it contains permanently marked incremental graduations.

To calculate the value of graduations-

1. Subtract the two values to get the value between the labeled graduations.

2. Determine how many spaces there are between the two graduations. Keep in mind that volume equals space.

3. Divide the number of gaps by the value between the graduations.

For cylinder  A.

2 ml- 1ml  = 1ml

Number of spaces = 5

∴1/ 5 = 0.2

Graduation = 0.2ml

For cylinder B -

20-10 = 10

number of spaces = 5

∴10/ 5 =2

Graduation = 2ml

For cylinder C-

10-5 = 5

Number of spaces= 5

∴5/5 = 1

Graduation = 1ml

Hence , Graduations for A , B and C will be  0.2 ml,  2ml and 1ml respectively.

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Your question is incomplete. Please find the missing image below.

Answer:

1. 62 grams 2. Compounds

Explanation:

assuming you want the molar mass, the answer to the 1st question is 62 grams.

The reactants are compounds due to there being 2 or more elements together

1. The number of mole of aluminum in each can is 2 moles

2. The number of molecules of aluminum that Darlene gave to the recycling guy altogether is 4.816×10²⁶ molecules

The mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Mole = mass / molar mass

Mole of one Al can = 53.96 / 27

Mole of one Al can = 2 moles

From Avogadro's hypothesis,

1 mole of Al = 6.02×10²³ molecules

Therefore,

800 moles of Al = 800 × 6.02×10²³

800 moles of Al = 4.816×10²⁶ molecules

Thus, Darlene gave to the recycling guy a total of 4.816×10²⁶ molecules

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A buffered solution will resist changes in pH when small amounts of acid or base are added.

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The empirical formula of the compound is CH₄N (N-methyl amide).

A sample of 0. 312g produces 0.458 g CO₂ and 0.374g H₂O.

The nitrogen content of a 0.486g sample is converted to 0.226g N₂.

Unknown :

The empirical formula of the compound = ?

Moles of C = 0.458g/(44g/mol) =  0.010409 mol

Mass of C =  0.010409 mol * 12

                  = 0.1249 g

Moles of H =  (2*0.374g)/(44g/mol) =  0.0415 mol

Mass of H = 0.0416g  

Mass of N in sample =  0.312g - (0.1249g + 0.0415g)

                                   = 0.1456g

Moles of N = 0.1456g/ (14g/mol) = 0.0104 mol

Moles of C : H : N = 0.0104 : 0.0415 : 0.0104

                              = 1 : 4 : 1

So, the empirical formula of the compound, N-methyl amide is CH₄N.

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Answer:

During winter in new york, the lower the temperature drops, the higher the demand for energy. this is an example of a negative relationship.

An inverse correlation that favors one partner at the expense of the other is referred to as a negative relationship. This may resemble codependency or other dysfunctional dynamics in which the needs of one spouse are not satisfied or even taken into account. Loss of trust, poor communication, lack of respect, a difference in priorities, and a lack of intimacy are the primary causes of negative relationships.

People who are in negative relationships are more likely to show signs of diminished confidence and self-worth. Additionally, it causes more self-doubt, helplessness, fear, worry, melancholy, insecurity, and paranoia, which lowers professional motivation and productivity.

Lower rates of anxiety and despair, more self-esteem, more empathy, and closer relationships are all examples of correlations that have been demonstrated in negative relationships. Your immune system can be boosted by having healthy connections, and they can also aid in your recovery from illness.

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Answer:

A and D is what I got hopes this helps

Mass of CaCl2 = 10 g.

Volume of solution = 1 L.

To determine the solubility, the concentration of CaCl2 solution has to be determined.

The formula for calculating the Molarity (conc. in mol/L) is:

Molarity = Number of Moles of the solute/Volume of solvent in L

The number of moles of solute is determined using the formula:

Number of moles = Mass in g/Molar mass in g/mol = 10g/110.98 g/mol = 0.09 mole.

Now, Molarity = 0.09/1 = 0.09 M

So, the concentration of CaCl2 is 0.09M

CaCl2 dissociates into Ca2+ and 2Cl− ions as shown below.

CaCl2→Ca2+ + 2Cl−

The concentration of Cl− ions in the solution = 2×0.09M =0.18M.

Substitute these values in the expression for the solubility product

Ksp = [Ag+][Cl−] = s×(s+0.18)

Since the value of Ksp is very low, the value of s will be negligible compared to 0.052, and hence,

(s+0.18) ≈0.18

Ksp = s×0.18

1.8×10^−10 =0.052 s

s = 1.8×10^−10/0.18

s = 10 x 10^-10 or 1 x 10^-9M

Therefore, the solubility of AgCl in the given CaCl2 solution is 1x10^-9 M

The amount of moles of a solute that can dissolve in a solvent before it becomes saturated is known as molar solubility. The amount of solute that dissolves in a liter of solution is most frequently expressed as the number of moles. As a result, it is typically expressed as "M" and measured in moles/liter.

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Lithium has 3 protons in the nucleus.

Atomic number =number of protons =number of electrons

According to the question,

we have been given atomic number= 3

So, number of protons will be 3 and number of electrons will also be 3.

We can additionally calculate number of neutrons as follows-

number of neutrons= mass number - number of protons

                                   = 6.941 - 3

                                   ≈ 4

Hence, the number of protons in lithium will be 3.

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The nucleus of Lithium has three protons.

The number of protons or electrons in the nucleus of a neutral atom is known as its Atomic number.

The total mass of an atom's protons and neutrons is known as its mass number. (neutrons and protons added together Equals nucleons)

Atomic mass= Mass number + Neutrons

Atomic number equals the sum of the protons and electrons

Since, atomic number given is 3

Therefore, protons in the nucleus will be 3.

Additionally, we may determine the neutron number using the formula below.

mass number = number of neutrons + number of protons

⇒ 6.941 = number of neutrons + 3

⇒ number of neutrons will be approximately 4.

Thus, lithium will contain three protons.

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I gotta say it's D cause all of those all react differently towards another chemical.