The law of conservation of mater states that
matter can both be destroyed and created.
matter can be created but not destroyed.
matter can be destroyed but not created.
matter cannot be created or destroyed.

Yes, recrystallization from water would be a viable technique of purification if crude acetanilide contained sugar and charcoal. Due to their physical insolubility, charcoal found in crude acetanilide and water will form a heterogeneous combination. Charcoal will separate during crystallization because it is insoluble in water. Sugar and the unreconstituted crude acetanilide make up the remaining portion of the combination. Crude acetanilide will crystallize in this combination and separate from the sugar and water solution. Filtration will be used to capture the crude acetanilide that has solidified. Sugar and water make a soluble solution, thus they are kept separate. This is how the charcoal and sugar combination is purified and its constituent parts are separated from crude acetanilide using the recrystallization process from water.

Answer:

The compound, H₂O, will not be found on the periodic table. This is because the periodic table only consists of individual elements. That being said, the elements found within H₂O are located on the periodic table. H₂O consists of hydrogen, denoted by the symbol "H", and oxygen, denoted by the symbol "O". The subscript (the 2) tells us that there are 2 hydrogen atoms located in the H₂O molecule.

Hydrogen is the first element listed on the periodic table and can be found in the top leftmost position. Oxygen is the eighth element on the periodic able and is located in the second row at the top right.

Answer:

545

Explanation:

If we let the unknown temperature in Kelvin be x,

[tex] \frac{0.376 \times 580.3}{43+273} = \frac{0.415 \times 907.1}{x} \\ \\ x = 545[/tex]

Considering the definition of percentage by mass,  the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

[tex]percent by mass=\frac{mass of solute}{mass of solution}x100[/tex]

In this case, you know:

Replacing in the definition of percent by mass:

[tex]3.5 =\frac{mass of ammonium sulfate}{200 g}x100[/tex]

Solving:

3.5÷100= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]

0.035= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]

0.035×200 g= mass of ammonium sulfate

7 g= mass of ammonium sulfate

Finally, the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.

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The correct chemical structure that corresponds to 1,1,1-trifluoroethane is (a).

What is  1,1,1-trifluoroethane?

A chemical structure is a spatial arrangement of atoms in a molecule. It determines the molecular geometry and when necessary the electronic chemistry as well .1,1,1-Trifluoroethane or simply known as trifluoroethane is Hydrofluorocarbon (HFC) compound that is colourless and highly inflammable gas with ether like odour. One method of preparation of 1,1,1-Trifluoroethane is by fluorination of 1-chloro-1,1-difluoroethane in the presence of hydrofluoric acid.  The chemical formula for 1,1,1-Trifluoroethane is [tex]C__{2} } H_{3} F_{3}[/tex]. The high stability of it's chemical structure because of being heavier than air makes it a greenhouse gas with high infrared absorbent power. It can be used as a propellant or refrigerant and in cleaning of electrical equipments.

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The terms is used to describe a solution that results when both the salute and solvent are called alloys

Alllys simply refers to mixture of a solid metal made by combining two or more metallic elements.

There exist alloys of

In conclusion, the terms is used to describe a solution that results when both the salute and solvent are called alloys

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Answer:

1768.14

Explanation:

1. molar mass of C₁₂H₂₂O₁₁ is: M=12*12+22*1+16*11=342 [gr/mol];

2. the required mass, m=M*ν is: m=5.17*342=1768.14 [gr].

1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N. Details about number of atoms can be found below.

How to calculate number of atoms?

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

However, the number of moles of oxygen in glycine can be calculated using the following expression:

Molar mass of C₂H5O2N = 75.07g/mol

Mass of oxygen in glycine = 32g/mol

Hence; 32/75.07 × 7.51 = 3.2grams of oxygen in glycine

Moles of oxygen = 3.2g ÷ 16g/mol = 0.2moles

Number of atoms of oxygen = 0.2 × 6.02 × 10²³ = 1.205 × 10²³ atoms

Therefore, 1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N.

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Taking into account the definition of pH and pOH, the pH of the solution is 9.69.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A solution had a hydroxide ion concentration of 4.9×10⁻⁵ M. This is [OH⁻]= 4.9×10⁻⁵ M. So, pOH is calculated as:

pOH= - log (4.9×10⁻⁵ M)

Solving;

pOH= 4.31

Replacing in the relationship established between pH and pOH, the pH can be calculated as:

pH + 4.31= 14

Solving:

pH= 14 - 4.31

pH= 9.69

In summary, the pH of the solution is 9.69.

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Answer:

10-6mol/l

Explanation:

hope i helped

0.3268 moles of PC15 can be produced from 58.0 g of Cl₂ (and excess

P4).

The mole, symbol mol, exists as the SI base unit of the amount of substance. The quantity amount of substance exists as a measurement of how many elementary entities of a provided substance stand in an object or sample.

The balanced chemical equation is

[tex]P_{4} + 10Cl_{2} = 4PCl_{5}[/tex]

The mass of clorine is m([tex]Cl_{2}[/tex]) = 58.0 g

The amount of clorine is n([tex]Cl_{2}[/tex]) = m([tex]Cl_{2}[/tex])/M([tex]Cl_{2}[/tex]) = 58/70.906 = 0.817 mol

The stoichiometric reaction,shows that

10 moles of [tex]Cl_{2}[/tex] yield 4 moles of [tex]PCl_{5}[/tex];

0.817 of [tex]Cl_{2}[/tex] yield x moles of [tex]PCl_{5}[/tex]

n([tex]PCl_{5}[/tex]) = 4*0.817/10 = 0.3268 mole

0.3268 moles of PC15 can be produced from 58.0 g of Cl₂ (and excess

P4).

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Taking into account the definition of pH and pOH, the hydrogen ion concentration will be 1×10⁻⁸ M.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

In this case, you know that pOH= 6.

Replacing in the relationship established between pH and pOH, the pH can be calculated as:

pH + 6= 14

Solving:

pH= 14 - 6

pH= 8

Replacing in the definition of pH the concentration of H⁺ ions is obtained:

- log [H⁺]= 8

Solving:

[H⁺]= 10⁻⁸

[H⁺]= 1×10⁻⁸ M

In summary, the hydrogen ion concentration will be 1×10⁻⁸ M.

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The highlighted apparatus are;

1) stirring rod

2) crucible

The term chemical reaction refers to the process by which two or more substances are combined to form a product. The product may look like or different from the reactants that were combined to produce it.

Now we can see the set up that was used as shown for the reaction of  dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate.

The highlighted apparatus are;

1) stirring rod

2) crucible

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Answer:

9.4x10^-1

Explanation:

You have to move the decimal left 3 times so you subtract 3 from the power (2) and get -1

Answer:

The corpuscular model of matter is a model of the microscopic structure of matter, which seeks to explain the properties and behavior in each state of aggregation

Explanation:

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The term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B

The term standard deviation has to do with the extent that values are scattered around the mean. Now we know that the mean is the average of the distribution.

The standard deviation shows the extent to which the values differ from the mean value of the distribution. It is a measure of dispersion.

Thus, the term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B

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Missing parts;

Minute Maid states that a bottle of juice contains 473 mL. Consumer groups are interested in determining if the bottles contain less than the amount stated on the label. To test their claim, they sample 30 bottles. The sample mean was 472mL and the standard deviation is 0.2.

What does mu represent here?

A. The average contents of all bottles of juice in the sample, which is unknown.

B. The average contents of all bottles of juice in the population, which is unknown.

C. The average contents of all bottles of juice in the population, which is 472mL.

D. The average contents of all bottles of juice in the sample, which is 472mL.

Answer:

36.1% Ca

Explanation:

To find the percent calcium, you need to (1) construct the chemical formula of calcium chloride, then (2) calculate the molar mass of calcium chloride, and then (3) calculate the percent calcium in calcium chloride.

(Step 1)

Calcium = Ca²⁺

Chlorine = Cl⁻

Calcium Chloride = CaCl₂

(Step 2)

Atomic Mass (Ca): 40.078 g/mol

Atomic Mass (Cl): 35.453 g/mol

Molar Mass (CaCl₂): 40.078 g/mol + 2(35.453 g/mol)

Molar Mass (CaCl₂): 110.984 g/mol

(Step 3)

CaCl₂ = 1 atom Ca and 2 atoms Cl

1 atom Ca = 40.078 g/mol

   40.078 g Ca
--------------------------  x  100%  =  36.1% Ca
 110.984 g CaCl₂

diphosphorus tetraiodide is the name of the p2I4 compound.

The name of p2I4 is diphosphorus tetraiodide because there are two atoms with phosphorus and four atoms with iodine. We know that 'di' word is used for two while on the other hand, tetra word is used for four.

So we can conclude that diphosphorus tetraiodide is the name of the p2I4 compound.

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The airbag is designed to produce the volume of nitrogen gas required to fill up the airbag.

An airbag is a bag which is designed to self-inflate and serve as a cushion for the head and neck of a driver to prevent injuries when an impact occurs head-on on the car.

The gas that inflates the airbag is nitrogen which is produced from sodium azide according to equation below:

In conclusion, the design of the airbag is such that the correct amount of sodium azide is present to produce the volume of nitrogen required to fill up the airbag.

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The molarity of citric acid in lemon juice is 0.222 mol/L.

Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I unit of Molarity is molar (M) or mol/L.

Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]

Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

                             = [tex]\frac{21.5\ g}{192\ \text{g/mol}}[/tex]

                             = 0.111 mol

Now put the values in above formula we get

Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]

              = [tex]\frac{0.111\ mol}{0.5\ L}[/tex]

              = 0.222 mol/L

Thus from the above conclusion we can say that The molarity of citric acid in lemon juice is 0.222 mol/L.

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Answer:

0.18 L

Explanation:

You can find the volume using the molarity ratio:

Molarity = moles / volume (L)

You can plug the given values into the equation and simplify to find the volume.

Molarity = moles / volume                           <----- Molarity ratio

2.5 M = 0.45 moles / volume                      <----- Insert values

(2.5 M) x volume = 0.45 moles                   <----- Multiply both sides by volume

volume = 0.18 L                                            <----- Divide both sides by 2.5

Electrons moving in a circle would be accelerating, would lose energy, and would therefore not be able to maintain their orbits.

Atomic models are designed to determine the nature of the atom. There have been several atomic models whose ultimate aim have been to underscore the interaction between the particles that compose the atom.

The atomic models include;

The main problem of the Planetary system model (Rutherford model) of the atom is that electrons moving in a circle would be accelerating, would lose energy, and would therefore not be able to maintain their orbits.

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Answer:

ion exchange

Explanation:

because in the time period of chemical reactions it product ion

The resulting solution will be neutral having a pH of 7.

The term pH is defined as the hydrogen ion concentration in solution. We know that the pH is inversely related to the hydrogen ion concentration in solution.

We know that the reaction between an acid and a base produced a salt. In this case, the salt that is produced is neutral because the acid is completely reacted with the base.

Since the solution contains a mixture of a  containing pH of 3.5 and that of a pH of 10.5, the resulting solution will be neutral having a pH of 7.

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The mole ratio of the compound and its constituent elements are as follows:

Mole ratio is the ratio of the moles of one or more elements or compounds to another.

The given compound is Ca₄Si₂O₆(CO₃)(OH)₂

Moles of oxygen present in 1 mole of compound = 11 moles

Moles of Si present in 1 mole of compound = 2 moles

Moles of Ca present in 1 mole of compound = 4 moles

Moles of C present in 1 mole of compound = 1 mole

Given the equation of the reaction below;

the mole ratio of the reactants and products are as follows:

In conclusion, the mole ratio of reaction is the ratio in which moles of the substances combine.

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The molarity of the solution will be 4.97 M.

It is the number of moles of solutes per 1 liter of solvent or solution.

Mole of 34.1 g NaCl = 34.1/58.44 = 0.5835 mol

117.3 mL = 117.3/1000 = 0.1173 L

Molarity of the solution = 0.5835/0.1173 = 4.97 M

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Lipids are made up of long hydrocarbon chains and is not soluble in water.

Hence, Option C is correct answer.

Carbohydrate is water soluble macromolecule because they are small polar molecules contains many -OH functional groups that makes it hydrophilic.  

Nucleic acids are long polymeric chain. They are hydrophilic in nature. Nucleic acid are soluble in water because of their polar nature.

Lipids are hydrophobic and they are generally water insoluble because lipids are non polar molecules. Lipids are oily or greasy molecules. Lipids are made up of glycerol molecule. It includes fatty acids.

Thus from the above conclusion we can say that Lipids are made up of long hydrocarbon chains and is not soluble in water.

Hence, Option C is correct answer.

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The concentration will be 12 M. The first option is the correct one.

It is calculated by dividing the number of moles of solute present in a solution by the volume of the solution.

In this case, the number of moles of solute = 1.2 mols

volume of solvent = 100 mL or 0.1 L

Concentration of the solution = 1.2/0.1 = 12 mol/L or 12 M

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