An unknown substance appears as a white powder

Answer:

When electrons are lost by one atom and gained by another atom

Based on the mass and volume of the copper, the density of copper is 8.92 g/cm³.

The density of a substance is the ratio of the mass of that substance and the volume of the substance.

mathematically:

From the data provided:

mass of the copper = 1896 g

volume of the copper can be calculated as follows:

volume = length * width * height

Volume of copper = 8.4 cm *  5.5 cm * 4.6 cm

Volume of copper = 212.52 cm³

Density of copper = 1896 g/212.52 cm³

Density of copper = 8.92 g/cm³

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Donwelling  is the process that moves cold, dense water from the ocean surface to the seafloor near the polar regions. Downwelling affect the ocean water around the poles as it brings oxygen - rich water to the ocean floor.

Downwelling occurs when the water on the surface of the sea becomes denser than the water beneath it and so it sinks. ocean water get denser when it gets cola or saltier.Most downwelling happens at the poles.

I f the air was warmer at the poles, then water wold be warmer too.so, without cold water there would be little downwelling.Oxygen in deep sea would have used up  and without strong downwelling , there is no way to replenish oxygen.

Hence, Downwelling affect the ocean water around the poles as it brings oxygen - rich water to the ocean floor.

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The density of mercury in pounds per cubic inch is 0.49 lb/in³.

Mercury is the only metal that exists in liquid form. The density of mercy is 13.6 g/cm³. It's one of the essential application is in thermometers, especially the ones used in chemistry labs. It is used to measure the temperature of various things. As with the increase in temperature, the mercury present inside the thermometer also increases.

The density of the mercury = 13.6 g/cm³.

1 lb = 2.54 cm

1 lb = 454 g

The density of the mercury in pounds per cubic inch is,

[tex]13.6 \frac{g}{cm ^{3} } = 13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54}{1 \: in} } ) {}^{3} [/tex]

[tex]13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54 {}^{3} \: cm ^{3} }{1 ^{3} \: in ^{3} } } )[/tex]

= 0.49 lb/in³

Therefore, the density of mercury in pounds per cubic inch is 0.49 lb/in³.

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The changes that are common between sauce burning on a stove, and jewelry tarnishing, which is a chemical change.

How to define chemical and physical changes?

Chemical Change-

Any alteration that produces new chemical substances with distinct properties is considered a chemical change. Chemical reactions involve the rearrangement and recombination of elements and compounds to create new substances. Examples of chemical changes are listed below:

Physical Change-

A substance is not destroyed or transformed into something new by physical changes. A substance can undergo physical changes that alter its shape, size, or phase. The constituents of an element or compound do not change during a physical change. Examples of physical changes are listed below:

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Answer:

The correct answer is 7.8 percent.

Explanation:

As mentioned in the given question, the absorbance (A) of the sample solution is 1.07. To find the concentration of aspirin, Beer's law is used, that is, A = ebc

Here, e is the extinction coefficient, which is equal to 139.322 M^-1cm^-1 as per the standard value for salicylic acid, b is the pathlength, which is equivalent to 1 cm. Now putting the values we get,  

A = ebc

c = A / (eb)

c = 1.07 / (139.322 × 1)

c = 0.00768 M

Now to determine the percent salicylic acid in the sample, there is a need to compare the value of concentration determined with the concentration of aspirin given initially.  

0.02 grams is the initial concentration of aspirin mentioned in the question. The molar mass of aspirin is 240 g/mol.  

Therefore, the moles of aspirin will be,  

0.02 / 240 = 8.33 × 10^-5 moles  

The final volume of the diluted solution given is 10 ml or 0.01 liters.  

The molarity of aspirin in the diluted solution will be,  

c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M

Now, the percent of salicylic acid in the product will be,  

c1 - c / c1 × 100

(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %

I believe that's your answer

hope it helps you;)

The concept Beers law or Beer Lambert law is used to determine the percentage of salicylic acid impurity in your aspirin. The percentage of salicylic acid is 96.5 % percent.

Beer-Lambert's law states that when a beam of monochromatic light passes through a solution of an absorbing substance, the rate of decreases of intensity of radiation with thickness of the solution is directly proportional to the intensity of incident radiation as well as the concentration of the solution.

The equation is:

A = ecx

Here, e is the extinction coefficient =  139.322 M⁻¹cm⁻¹

c = A / (ex)

c = 0.040 / (139.322 × 1)

c = 0.000287

Initial concentration = 0.02

Molar mass of Aspirin =  240 g/mol

Moles of Aspirin = 0.02 / 240 = 8.33 × 10⁻⁵

Final volume of the diluted solution = 0.01 L

Molarity of aspirin is:

c₁ = 8.33 × 10⁻⁵ / 0.01 = 8.33 × 10⁻³M or 0.00833 M

Percent of salicylic acid is:

c1 - c / c1 × 100

(0.00833 - 0.000287) / 0.00833 × 100 = 96.5 %

Thus the % of salicylic acid is 96.5 %.

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Answer:

27.78

Step by Step:

100 x 1000 = 100000

100000 / 3600 = 27.77777778 m/s

Relative to the other substances, water tends to resist changes in temperature because water is highly cohesive. Its molecules tend to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.

Between water molecules, the hydrogen bonds gives water the ability to hold heat better than any other substances. When the temperature rises, the hydrogen bonds between water molecules breaks continuously to reform. It allows the overall temperature to remain stable, but increased energy is added to the system.

The tendency of water molecules to stay close to each other is due to the strong hydrogen bonding between the atoms. This strong hydrogen bond causes water to resist motion of molecules and remain at room temperature.

Specific heat of water is really high due to which water resist the temperature change. A lot of heat is required to move the water slightly and resist the temperature changes. Heat gets absorbed when the hydrogen bonds break.

Correct question is -

Relative to other substances, water tends to resist changes in temperature. Why?

1) Water is extremely dense, and like all dense materials, it can absorb a great deal of heat with a relatively small change in temperature.

2) Water is abundant. Large bodies of water resist changes in their temperature simply because they are massive objects.

3) Water is highly cohesive. Its molecules tend to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.

4) Water is highly adhesive. Pure water does not resist temperature change, but if water is bonded to other substances, molecules will tend to "stay put" and resist increases in their motion.

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Answer:

Mm(2MgO)=2×24+16

=64

=

Explanation:

2

The mole idea is a useful way to indicate how much of a substance there is. The numerical magnitude and the units can be separated into two components to represent any measurement. The moles of magnesium is 0.012.

Even one gram of a pure element is known to have an enormous number of atoms when working with particles at the atomic (or molecular) level. The mole idea is frequently applied in this situation. It largely concentrates on the thing called a "mole."

The expression used to calculate the moles is:

n = Mass / Molar mass

The molar mass of MgO = 40.30 g/mol

n = 0.486 / 40.30

n = 0.012

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Methane is a gas which is colourless and and odorless. It is a hydrocarbon with formula CH₄. Where as Hexane is an alkane containing 6 carbon atoms. Its molecular formula is C₆H₁₄. For the structure refer the figure given below.

Coming to the properties there are both physical and chemical properties.

Hexane is a colourless volatile liquid and undergoes combustion reaction, being a higher hydrocarbon it undergo thermal cracking.

It is commonly used as solvents, biodiesel production etc. Boiling point is 69⁰C and melting point is 95⁰C.

Methane is a gas which is colourless and odorless.  It  is lighter in air, slightly soluble in water, it is flammable.  boiling point is -162⁰C and melting point is -183⁰C.It is used as fuel, it is used in explosives.

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Among the following, oxygen is a molecule and not a compound.

Molecule is a group of two or three atoms which are held by chemical bonds.Compound is a substance composed of two or more atoms which are held together chemically in a fixed proportion.

Hence all molecules are not compounds  but all compounds are molecules.Structure of molecule comprises of group of atoms which are held together by a strong force.

Thus,oxygen is a molecule as it is composed of 2 oxygen atoms while water, ammonia and carbon dioxide are compounds as they are composed of two-four atoms.

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The mole fraction of hydrogen is 0.55.

The volume of oxygen = 5 litres

The pressure of oxygen = 2 atm

The volume of hydrogen = 3 litres

The pressure of hydrogen = 4 atm

The universal gas constant is R.

R = 8.31 J mol—¹ K—¹

The ideal gas equation is,

PV = nR T

The number of moles of oxygen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{2 \times 5}{8.31 \times 273} [/tex]

n = 0.004 moles

The number of moles of oxygen is 0.004 moles.

The number of moles of hydrogen is,

PV = nRT

[tex]n = \frac{ PV }{RT }[/tex]

[tex]n = \frac{4 \times 3}{8.31 \times 273} [/tex]

n = 0.005 moles

The number of moles of hydrogen is 0.005 moles.

The mole fraction of hydrogen is,

[tex]Mole \: fraction = \frac{ Moles \: of \: solute }{Total \: number \: of \: moles \: of \: solute\: and \: solvent}[/tex]

[tex]Mole \: fraction = \frac{0.005}{0.009} [/tex]

= 0.55

Therefore, the mole fraction of hydrogen is 0.55.

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Chemical Bonding : The molecules are usually categorized into two categories depending on the bonding and the bonding are classified into ionic bonds and covalent bonds.

Other comes under wander vall interactions.

If the molecular atoms are not hydrogen atoms then it must shares polar covalent bond , it is defined as the distribution of electrons unequally (that means one have partial charges considered both positive and negative.

The main reason behind the distribution of electrons in any atom is the electronegativity. It determines the distribution of of the shared electrons in the middle of two atoms in a polar covalent bonding.

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The energy released when IMF'S formed between the molecules as they approach each other because making IMF'S lowers the energy of electron and increase the level of stability.

Atoms tends to stabilize when they form IMF's , ans release energy in the process. energy is released because of the greater level of stability associated with low energy.

Energy is released in the chemical bond formation because bonds are in stable configuration.  .the change in enthalpy will be negative for the process.the  reaction  is exothermic.In opposite breaking of bond required energy.

Thus ,energy is released when IMF'S formed between molecules as they approaches each other because they acquire greater level stability with low energy levels.

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Answer: 39.13

Explanation: 39 x 93.12%=36.31

41 x 6.88%= 2.82

2.82+36.31= 39.13

The metals in the periodic table react with water to form bases, the nonmetals react with water to form acids while the metalloids have intermediate properties.

The periodic table is an arrangement of elements according to their increasing atomic numbers. The atomic number of an elements has to do with the number of protons in the atom as well as the number of electrons in the neutral atom of the substances.

We know that the periodic table is composed of the metals, the non metals and the metalloids. The metals are found towards the far left end of the periodic table and they have properties such as ability to liberate hydrogen when reacted with acids and the ability to tarnish when exposed to the atmosphere.

Towards the middle of the table, we have the metalloids whose properties are intermediate between those of the metals and the nonmetals. The nonmetals are known to dissolve in water to produce acids just as the bases react with water to produces bases.  Some metals are amphoteric.

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The equation of state for a hypothetical ideal gas is known as the ideal gas law, sometimes known as the general gas equation. i.e. PV = nRT or P1V1 = P2V2.

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Answer:pollution clean

Explanation: pollution clean up can help evert damages that have yet to be done while pollution cleanup can't rever the effects it has already done

If a given block of metal has a known mass of 110.2 g, and the mass is measured three times to get the following readings -100.2 g, 100.1 g, 100.3 g, then the average mass will be 100.2 g.

Mass is a quantity which is dimensionless. It represents amount of matter in any object. Average mass is known as the total sum of given masses divided by the number of times mass is measured.

Mathematically, average is the sum of all results in a sample divided by the total number of the items in sample.

     Average mass =   Sum of all the mass  

                                  Number of results(mass)

Therefore,

Average mass = (100.2 + 100.1 + 100.3) g

                                             3

Average mass = 300.6 g

                               3

Average mass = 100.2 g

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The correct option is (c) Gold.

The Specific Heat of the given metal is to be calculated and then compared to Specific Heat of respective metals in the options.

The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat. The formula below, where c is the specific heat, is typically used to explain the relationship between heat and temperature change. If a phase shift occurs, the relationship is invalid because the temperature is unaffected by the heat added or lost during a phase transition.The unit "calorie" can also be used to measure specific heat, which is often measured in Joules per gram per degree Celsius (J/kg °C).Every substance has a unique specific heat capacity, a number that characterizes its chemical feature.

                Q=mcΔT

where,

Q= heat added (Joules)

m= mass (grams)

c= specific heat (J/ kg °C)

ΔT= change in temperature (T₂(final) – T₁(initial))

mass of water, m₁ = 10 g =  [tex]10^-2[/tex] kg

mass of metal, m₂ = 30 g = 3× [tex]10^-2[/tex] kg

Initial temperature of water, T₁ = 10° C

Initial temperature of metal, T₂ = 131° C

Final Equilibrium Temperature, T= 20°C

So, Heat gained by water = Heat loss by metal

⇒ m₁ c₁ (T - T₁) = m₂ c₂ ( T₂ - T)       [ c₁ and c₂ are Specific Heat of water and metal respectively]  [ c₁ = 4200 J/kg °C ]

⇒  [tex]10^-2[/tex] × 4200 × ( 20 - 10) = 3 × [tex]10^-2[/tex] × c₂ × (131 - 20)

⇒ c₂ = ( [tex]10^-2[/tex] × 4200 × 10) / ( 3× [tex]10^-2[/tex] × 111)

⇒ c₂ =  126.126 J/kg °C

The Specific heat of metal is  126.126 J/kg °C which is equivalent to the Specific heat of Gold.

So, the metal is Gold.

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The complete question is:

"suppose 10g of liquid water at 10°C is placed in an insulated cup. if a 30g piece of metal at 131°C is placed in the water and brought to equilibrium at 20°C, what type of metal is it ?"

      a.silver

      b.copper

      c.gold

      d.aluminium

      e.tungsten

The correct answer is option D) Both A and C are correct.

Carbohydrates are the hydrate of carbon and they are large macromolecules made of carbon (C), hydrogen (H), and oxygen (O). They can be found as starch, cellulose, and sugars in food and living tissues.

Carrots also produce natural sugar, which provides energy for the plant to reproduce. This sugar is then delivered to the storage organs of carrots (the root). Then the sugar is transformed into starch because starch is non-soluble and hence it is easier to store it.

However, when plants need energy, this starch is converted back into sugar by the activity of an enzyme. Depending on how much sugar is still available, carrots and similar plants vary in sweetness.

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A scientist tests a small section of a carrot root to determine which molecules were present the basic results showed that the molecules contained carbon hydrogen and oxygen with some arranged in a ringed pattern providing structure and energy to the root what inference can be made from this data?

A) The molecules are a  type of a carbohydrate

B) The carrot root is mainly composed of proteins

C) The carrot contains some type of sugar

D) Both A and C are correct

A nonmetal is a chemical element that doesn't have a lot of metallic characteristics; examples include colourless gases (like hydrogen) and glossy, solids with high melting points (like boron).

Dull, brittle and non conductive best describes which of the following:

"S - Sulfur"

A Non-metallic Chemical element sulfur has the letter S and atomic number 16. It is multivalent, nonmetallic, and plentiful. Sulfur atoms normally combine to create cyclic octatomic molecules, which have the chemical formula S8. At room temperature, elemental sulfur is a crystalline solid that is brilliant yellow.

When compared to metals, nonmetals' electrons exhibit different behaviour. With a few exceptions, nonmetals don't have any moving parts, which makes them often poor heat- and electricity-conductors and brittle or crumbly when solid. Metals are good conductors since their electrons are typically free to move about, and the majority of them are also simple to flatten into sheets and draw into wires. Nonmetal atoms have varying degrees of electro negativeness, which makes them more likely to draw electrons in chemical processes and produce acidic compounds.

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The concentration of Cl₂ is: 2.19ppm

The concentration of a chemical solution is expressed in molarity and parts per million (ppm), two units of measurement. The molecular or atomic mass of the solute is comparable to one mole. Parts per million, naturally, refers to the quantity of solute molecules in every million parts of a solution.

1ppm = 1mg in 1000g solution

Given chlorine concentration = 3.09X10⁻⁵M

The atomic mass of chlorine is 35.5g/mol

For Cl₂, atomic mass = 35.5*2=71g/mol

W=  3.09X10⁻⁵ X 71 = 2.19 X 10⁻³g Cl₂ per liter solution

So, W= 2.19mg/lit solution

Now, let us assume density of solution = 1

Therefore, concentration of Cl₂ = 2.19ppm

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Glycerol has the stronger intermolecular attraction because it has larger molar mass and more viscous than water.

Viscosity is the measure of resistance of fluid to flow. Fluid can be a liquid or a gas.

Glycerol is more viscous in nature because of the length of the chain and many possibilities for hydrogen bonding between the molecules.

With great hydrogen bonding, the intermolecular attraction is stronger in glycerol.  Viscosity and molar mass are directly related to each other, i.e., viscosity increases with the molar mass.  

Glycerol contains three hydroxyl groups per molecule, and water contains one hydroxyl molecule due to which hydrogen bonding is more in glycerol than in water which makes glycerol a syrupy, viscous fluid resulting in the stronger intermolecular attraction.

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Making a solution of sodium chloride for an experiment , we add 250 mg of sodium chloride to 500 ml of lab water. the sodium chloride concentration of solution in unit of mg/l is 499.7 mg/l and in ppm is 499.7 mg/l.

mass of solute = 250 mg = 0.250 g

volume of solvent = 500 ml = 500 g

mass of solution  = 0.250 g + 500 g = 500.25 g

concentration of solution in ppm ( parts per million ).m

= ( mass of solute in g / mass of solution in g  ) × 1000000

= ( 0.250 g / 500.25 g) × 1000000

= 499.7 ppm

so, we know that , 1 ppm is equivalent to 1 mg /l

1 ppm = 1 mg/l

Therefore, 499.7 ppm = 499.7 mg / l.

thus,Making a solution of sodium chloride for an experiment , we add 250 mg of sodium chloride to 500 ml of lab water. the sodium chloride concentration of solution in unit of mg/l is 499.7 mg/l and in ppm is 499.7 mg/l.

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The pie chart is the graphical representation of data. The given pie diagram is showing the content of different elements in the figure.

The pie chart is the graphical representation of data. In the given pie chart elements are given in the information.

Therefore, The pie chart is the graphical representation of data. In the given pie chart elements are given in the information.

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Answer:

    2. 8%

    3. 2%

    4. 4%

    5. 46%

An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg

The volume of iceberg = 7670 cubic feet.

Density of ice = 0.917 g/cm[tex]^{3}[/tex]

so, Density is given by,

Density = mass / volume

density of ice =  (0.917 /1000) kg/cm[tex]^{3}[/tex]

1 cm[tex]^{3}[/tex] = 0.00003531 ft[tex]^{3}[/tex]

therefore,

0.000917 kg/cm[tex]^{3}[/tex] = (0.000917 × 0.00003531 ) kg/ft[tex]^{3}[/tex]

                            = 0.0000000324 kg/ft[tex]^{3}[/tex]

now,putting the values in formula , we get,

Density = mass / volume

mass = density × volume

         = (0.0000000324 × 7670 ) kg

         = 0.0002483 kg

Hence,An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg.

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