which of the following statements is false? gas molecules collide with each other without loss of energy. gas molecules collide with the container walls without loss of energy. the pressure of a gas at constant temperature in a sealed container will gradually decrease. because of the relationship between temperature and average molecular speed, the temperature of a gas would drop if energy were lost in collisions. friction does not slow down gas particles and cause them to stop moving.

The molar mass of the metal Sulfide  is 83.02g/mol.  

The molar mass of Sulfide  is the addition of molar mass of Sulphur with molar mass of given metal which is given by subtract the molar mass of hydroxide from total molar mass of metal hydroxide.

The molar mass of the [tex]M(OH)_{4}[/tex] =118.97g/mol

Molar mass of Oxygen = 15.999g/mol

Molar mass of Hydrogen= 1.008g/mol

Therefore:

molar mass of [tex]M(OH)_{4}[/tex]= (molar mass of M) +4(molar mass of oxygen + molar mass of hydrogen)

118.97=(molar mass of M)+(15.999 x4)+(1.008x4)

118.97=(molar mass of M)+(63.996+4.032)

118.97-68.028=molar mass of metal(M)

molar mass of Metal=50.942 g/mol (that is Vanadium)

Molar mass of metal + molar mass of Sulphur to give metal sulfide.

50.942+32.06=83.02g/mol

Hence,  the molar mass of  Vanadium Sulfide([tex]V_{2} S_{5}[/tex] ) is 83.02g/mol.  

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Method: Filtration

Sodium chloride is your everyday common table salt! So it's just separating salt fro. Water!

Procedure: The mixture of salt and sand can be separated by filtration followed by an evaporation process. Filtration can separate sand from a combination of sand and salt solution (salt dissolved in water). Sand stays on the filter paper as a residue after filtering. By boiling the filtrate, common salt may now be produced. Boiling causes all of the water to evaporate, leaving just salt remaining. This is known as evaporation. Thus, this is how salt and sand are separated.

Answer:

in meters its 0.01175

Explanation:

Answer:

0.01175 meters

Explanation:

Given the symbol Cl-37, the element is Cl, but there is no information about its charge. When this is like that, it is implicit it is an atom, that is, it is neutral, its charge is 0.

The number indicates is the mass number, so its mass is 37.

So, mass is 37 and charge is 0.

Answer:

Combination or Synthesis

Explanation:

It is a combination because 2 reactants are combining together to form the product.

When 20 grams of a salt is dissolved in 95 grams of water, the temperature of the solution decreases from 40oc to 0oc. 880 calories heat is absorbed, the Specific Heat of the solution is 1.1 Cal/goc.

delta t = T f - T i

          = 0 - 40

          = -40 degrees Celsius

c = 1.1 Cal/g degrees Celsius

m = 20 grams

heat absorbed (q) = mc(delta)t

                          q = 20 * 1.1 * -40 degrees Celsius

                           q = 880 Cal

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The gas is oxygen which causes the splint to relight and the reaction is of hydrogen peroxide resulting into water and oxygen.

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Correct statements are:
An element is a type of atom that has a specific number of protons.
An atom is the smallest unit of an element that retains the characteristics of that element.
Minerals are composed of chemically bonded elements.

When a mineral is separated into its component atom parts, those parts will act according to the element they belong to, and the elements have properties that differ from the original mineral, because of chemical bonds formed during the creation of the mineral.

If a single atom of an element is broken apart, its pieces are protons, neutrons, and electrons, particles that are universal for all elements, and there is no way to distinguish, for example, iron neutrons from hydrogen neutrons. In cases of radioactive decay, atoms of elements may break down to form new elements.

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The empirical formula of the compound is C3H4O as the mole ratio is 3 : 4 : 1

1) Mass of carbon (C) in 3.190 g of carbon dioxide (CO₂)

atomic mass of C: 12.0107 g/mol

molar mass of CO₂: 44.01 g/mol

Setting up proportion as:

12.0107 g of C / 44.01 g of CO₂ = x / 3.190 g of CO₂

x  = 0.87057 g of C

2) Mass of hydrogen (H) in 0.9360 g of water (H₂O)

atomic mass of H: 1.00784 g/mol

molar mass of H₂O: 18.01528 g/mol

Setting up proportion as:

2 × 1.00784 g of H / 18.01528 g of H₂O = x / 0.9360 g of H₂O

x = 0.10472 g of H

3) Mass of oxygen (O) in 1.0857 g of pure sample

Mass of O = mass of pure sample - mass of C - mass of H

Mass of O  = 0.38397 g O ≈ 0.3840 g

4) Mole calculations

C:  0.87057  g / 12.0107 g/mol = 0.07248 mol

H: 0.10472 g / 1.00784 g/mol = 0.10390 mol

O: 0.3840 g / 15.999 g/mol = 0.02400 mol

So, to find empirical formula the mole ratios are:

C: 3

H:  4

O:  1

Thus the mole ratio is 3 : 4 : 1, and the empirical formula is: C3 H4 O

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8.70 g of carbon dioxide are generated by the reaction of octane.

Let's compile all the data in one location since we are aware that we will require a balanced equation with masses and molar masses.

M_r:                    32.00      44.01

             2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 18H₂O

  m/g:                    9.88

(a) Calculate the moles of O₂

n = 9.88 g O₂ ×1 mol O₂ /32.00 g O₂

n = 0.3088 mol O₂.

(b) Calculate the moles of CO₂

(16 mol CO2 to 25 mol O2) is the molar ratio.

n = 0.3088 mol O₂ × (16 mol CO₂/25 mol O₂)

n = 0.1976 mol CO₂

(c) Calculate the mass of CO₂

Mass of CO₂ = 0.1976 mol CO₂ × (44.01 g CO₂/1 mol CO₂)

Mass of CO₂ = 8.70 g CO₂

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The molarity of the solution is 0.619 M if we dissolve 23.4 g of manganese(ii) sulfate in a volumetric flask and add water to a total volume of 500 ml.

The molarity is equal to the moles of a solute divided by the total number of liters in the solution. The molarity of a material quantifies its concentration in a given volume of solution.

Molarity is the concept that describes the relationship between moles of a certain solute and the volume of the supplied solution. To calculate your molarity, you must start with moles and volumes, moles and milliliters, and mass and volumes.

Molarity formula and units

The units of molarity are M or mol/L.

Molarity equation

M = moles solute/liters solution

Molarity = number of moles of solute divided by the volume of solution in a liter

= number of moles of solute × 1000/ volume of solution in the liter

= number of moles

= Mass/ molecular weight

= 23.4/151

= 0.155moles

Molarity = 0.155× 1000/250

= 0.619 M

The concentration of manganese ion = concentration of sulphate ion = 0.619 M

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If there is no change in pressure or no change in volume of the system, then the heat of the reaction will be equal to the change in internal energy of the system.

According to the first law of thermodynamics,

The total change in internal energy of the system is equal to the sum of the heat added to the system and the work done by the system.

So, we can write,

ΔH = ΔQ + W

Where,

ΔH is the heat of the reaction,

ΔQ is the heat evolved or heat given,

W is the work done by the system,

We know work by the gas is,

W = VΔP or PΔV

Where V is the volume of the gas and P is pressure of the gas.

So, for the heat of the system to be equal to that of the hear evolved in the system.

W = 0

For W to be zero,

Either, ΔV or ΔP has to be zero,

So, we can conclude that if change in the pressure of the system of the change in volume of the system is zero.

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Respiration, which releases the energy in food molecules, usually involves energy and enzymes.

Respiration is the process by which cells obtain chemical energy by the consumption of oxygen and the release of carbon dioxide.

Respiration is the major process through which living organisms obtain their energy. They do this by breaking down food ingested.

Cellular respiration combines glucose and oxygen to synthesise carbondioxide and water as products. This process synthesize a large amount of energy, however, it utilizes energy as well.

Therefore, energy and enzymes are used up in the process of cellular respiration.

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The molar absorptivity of the blue dye is greater than the molar absorptivity of the red dye.

The Beer-Lambert Law equation is as follows

A = εcl  

where; ε= molar absorptivity

A= absorbance

l = optical path length

c= molar concentration

The molar absorptivity of the blue dye;

1.30 x 10⁵ M⁻¹cm⁻¹

The molar absorptivity of the red dye :

2.13 × 10⁴ cm⁻¹M⁻¹

This is reason that the blue dye solution appear more intensely colored than the red dye solution

Following are the factors that can affect the molar absorptivity:

1.The amount of light absorbed by the substance for a specific wavelength.

2.The distance that the light travels through the solution.

3.The concentration of the absorbing solution per unit volume.

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Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.

The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.

Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The atomic number is the small number on the top left corner of the square of the element.

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Electrons and proton are a type of subatomic particle with a negative and positive charge. Protons are held together in the atom's nucleus by the nuclear force. A subatomic particle without charge is the neutron.

The electron, the smallest constituent part of an atom, has a negative charge. Protons and electrons are present in an atom in a neutral state in an equal number. One electron and one proton are all that the hydrogen ion has. On the other hand, the atomic nucleus possesses 92 protons, that means 92 electrons.

Electrons are present outside of the atom's nucleus, in contrast to neutrons and protons that are contained inside the nucleus at its center. Negative electrons are drawn to the positively charged nucleus so because electric charges of opposite sign attract one another.

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Yes, the motor would run faster because the increased electrical force increases the magnetic force in the motor. That is option B.

An electrical field is defined as the type of field that is surrounded by charged particles which may be negatively or positively charged.

A battery is an electron chemical cell that has the ability to generate electrical energy through chemical reaction in its cells.

A magnetic force is defined as the type of force generated through the action of moving electric charges or magnetic materials.

When the number of batteries in a circuit is being increased, there would be increase in the input voltage leading to an increase in the magnitude of the speed.

Therefore, the motor is expected to run faster because of the increased magnetic force of the motor which is caused by increase electrical force.

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Isotopes are atoms of an element with the same number of protons but a different number of neutrons.

Isotopes are different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers or atomic masses.

Stable and unstable isotopes are the two basic categories of isotopes. 254 stable isotopes are known. Scientists refer to all synthetic (lab-made) isotopes as radioisotopes since they are radioactive due to their instability.

Examples of isotopes include carbon 12, which has 6 neutrons, carbon 13, which has 7 neutrons, and carbon 14, which has 8 neutrons. Carbon 14 is the radioactive isotope while the rest are stable.

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Answer: There is equal number of each type of atom on the reactant and product side.

Explanation:

Answer:

[tex] \huge{ 3.935 \times {10}^{ - 16} J}[/tex]

Explanation:

The energy of the photon can be found by using the formula

E = hf

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question the frequency is

5.94x10^17Hz

We have

[tex]E = 6.626 \times {10}^{ - 34} \times 5.94 \times {10}^{17} \\ = 3.935 \times {10}^{ - 16} J[/tex]

Hope this helps you

Answer:

D. Density is defined as mass/volume.

The pressure - volume work can be determined using the change in volume ΔV and a constant pressure P. Here, the final volume for the work done of 355 J at a pressure of 1 atm is 346 l.

Work done on system or by a system can be thermodynamically determined using the equations connecting the variables temperature, T pressure p and volume V.

A pressure-volume work done is the expansion or compression of a gas at constant pressure and this can be mathematically written as:

W  = - P ΔV.

    = -P (V2 - V1)

It is given that the initial volume V1 = 8.50 L at a pressure of 1 atm and the work done for the expansion to volume V2 is 655 J. Thus, the final volume V2 is calculated as follows:

- 355 J = 1 atm ( V2 - 8.50 L)

      V2 = -355 + 8.50 L

            = 346.5 L.

Here, the volume is increased highly from the initial volume so this expansion and is work done by the system. Therefore, the final volume of the system is 346 liters.

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The electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Atomic number of Chlorine  is 17. to write the electronic configuration of chlorine we need to know the number of electrons in chlorine atom. the atomic number of chlorine is 17 therefore there are 17 electrons. the first two electron enter in 1s since s can hold only 2 electrons then next two electron will enter in 2s . the next six electrons will enter in 2p since p can hold six electrons . and next two electron in 3s now reaming 5 will enter in 3p. therefore the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.

Thus, the  electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵

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Answer:

K- Potassium

O- Oxygen

H- Hydrogen

KOH is called as Potassium Hydroxide and it contains K (Potassium), O (Oxygen) and H (Hydrogen) elements.

Caustic potash is a common name for potassium hydroxide, an inorganic compound with the formula KOH. The majority of its industrial and niche applications capitalize on its caustic nature and acid reactivity. It important because it is the starting point for most liquid and soft soaps, as well as many chemicals that contain potassium.

It is a dangerously corrosive white solid. KOH has a high level of thermal stability. Melt-casting it into pellets or rods with low surface areas and easy handling properties is common due to its high stability and low melting point. Because KOH is hygroscopic, these pellets become tacky when exposed to air.

Its dissolution in water is strongly exothermic, with water and carbonates accounting for the remaining 90% purity. A common name for concentrated aqueous solutions is potassium lye. Solid KOH does not easily dehydrate even at high temperatures.

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Dry ice sublimates when its molecules get enough thermal energy to the intermolecular holding the solid crystal together in some cases. This allows some molecules to transition directly into the vapor phase.

A substance can sublimate directly from its solid to it's own gaseous state without going through a liquid phase. Sublimation is the term most frequently used to describe the process through which snow and ice turn into water vapor in the air before even melting into liquid for those of us who is interested in the water cycle.

The sublimation procedure is used by chemists to clean up their substances. Typically, a solid is heated in a sublimation apparatus under vacuum. A non-volatile residue of impurities is left behind as the solid volatilizes and condenses as a refined chemical on a cooled surface (cold finger) at this lower pressure.

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Answer: I think it’s C

Explanation:

I think it’s C because animal cells do not have a cell wall and the cell wall is unique to plant cells

Fresco is the ground pigment in which painting material combines with a linseed oil vehicle and turpentine medium.

Fresco is a type of ancient painting where color is applied to a wet lime plaster surface while being suspended in alkaline limewater. Fresco is not to be confused with a patina layer that is put on dried plaster or limewash. They are known as Secco applications. Fresco must be applied while the plaster is still damp and is only intended for use on pure lime plaster.

It cannot be applied to plaster that has dried, cement, lime with cement, or lime stucco (also referred to as lime stucco). The coloured limewater will carbonate with the wet plaster throughout the curing process after being applied to it, becoming a permanent part of the lime plaster surface. Fresco as a painting material can be utilized inside or outside.

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A calibration curve is a regression model that uses the instrument's reaction to known standards to forecast the unknown concentrations of interest-related analytes.

How do you calculate calibration curve?

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Answer:

density = 5 g/ml

Explanation:

D=m/v. Mass=30g and Volume=6mL

SO solve for D when m = 30 and v = 6

D=m/v

D = 30/6

density = 5 g/ml

There are no unpaired electrons present in this atom of oxygen.

The molecular orbital configuration of the oxygen atom given is,

1s²2s²2px²2py².

As we can see, there is not electron in the configuration which is alone in the orbital, they all are present in pairs. So, there are no unpaired electrons present.

This state of the oxygen atom when there are no unpaired electron are present, this could be the ground state of the atom.

The ground state of the atom is when the potential energy of the electrons of the atom is minimum.

In this configuration, no electron is unpaired, all the electrons are paired.

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