Question 6 (5 points)
Label each situation as metals, nonmetals, or metalloids. Label each with numbers.

Usually conducts electricity
& heat well

at room temperature these
are gases or liquids

Will lose valance electrons
to form compounds.

can be used as
semiconductors

Will gain valance electrons
to form compounds.

1. a metal
2. a nonmetal
3. a metalloid

Answer:

Volume (v) = 10 cm^3

Mass (m) = 8g = 8/1000 kg = 0.008 (SI unit of mass is kg)

Density (D) = ?

Now,

D = m/v = 0.008/10 = 0.0008

Answer:

false.nowadays humans are destroying forest,extracted more minerals,making pollution. in my view.

Answer:

I don't know the answer sorry man

The isoelectronic  species is largest in size is that they are the same size.

Option D is correct.

Isoelectronic species are described as atoms and ions that have the same number of electrons or can be defined as a pair of species having the same number of electrons combining all the atoms of a particular species is called an isoelectronic pair.

From the given option above, Isoelectronic species are those species which have same number of electrons an each of them has 10 electrons.

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Answer:

Muller's ratchet is a paradigmatic model in population genetics which describes the fixation of a deleterious mutation in a population of finite size due to an unfortunate stochastic fluctuation.

Explanation:

Answer:

Muller's ratchet is a paradigmatic model in population genetics which describes the fixation of a deleterious mutation in a population of finite size due to an unfortunate stochastic fluctuation.

Explanation:

This is the correct answer took a test and got this correct thank you to the original user above.

answer and explanation

to determine the percentage by mass of N on methyl orange.

We must first calculate the molar mass of methyl orange:

Carbo: 14 x 12.0 = 168

Hydrogen: 14 x 1.00 = 14

Sodium: 1 x 22.0 = 22.0

Nitrogen: 3 x 14.00 = 42

Oxygen: 3 x 15.99 = 47.97

Sulphur: 1 x 32.0 = 32.0

Total Methyl orange molar mass = 327,33 g/mol

Percentage mass of Nitrogen = mass of nitrogen/ mass of methyl orange x 100

42/327.33 x100

= 12.8%

Answer

The atomic weight of the unknown element is 207 g/mol

Step-by-step explanation:

Given that:

XO2 is the compound

Step 1: we need to find the mole of oxygen

Mole = reacting mass / molar mass

3.20g of oxygen was produced when the compound was heated

reacting mass of oxygen = 3.20g

Mole = 3.20 / 16

Mole of oxygen = 0.2 mole

Oxygen has 2 moles

Element X has 1 mole

We need to find the mole of the unknown element

Let the mole of the unknown element be x

2 ---------- 0.2 mole

1 --------- x mole

Cross multiply

2 * x = 0.2 * 1

2x = 0.2

Divide both sides by 2

2x/2 = 0.2/2

x = 0.1 mole

Therefore, the mole of the unknown element X is 0.1 mole

Next step is to find the atomic weight of element X

Recall, Mole = racting mass / molar mass

Mass of X = (23.9 - 3.2)

Mass of X = 20.7 gram

Reacting mass = mole x molar mass

Atomic weight = reacting mass / mole

Atomic weight = 20.7 /0.1

Atomic weight = 207 g/mol

The element with atomic weight 207 is lead (Pb)

Answer:

\(\triangle G= -6.7 KJ/mol\)

Explanation:

From the question we are told that:

Chemical Reactions:

X=A⇌B,ΔG= 14.8 kJ/mol

Y=B⇌C,ΔG= -29.7 kJ/mol

Z=C⇌D,ΔG= 8.10 kJ/mol

Since

Hess Law

The law states that the total enthalpy change during the complete course of a chemical reaction is independent of the number of steps taken.

Therefore

Generally the equation for the Reaction is mathematically given by

\(T = +1 * X +1 * Y +1 *Z\)

Therefore the free energy, ΔG is

\(\triangle G=1 * \triangle G*X +1 * \triangle G*Y +1 * \triangle G *Z\)

\(\triangle G= +1 * (14.9) +1 * (-29.7) +1 * (8.10)\)

\(\triangle G= -6.7 KJ/mol\)

Answer:

\(V=0.200L\)

Explanation:

Hello,

In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:

\(V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L\)

Best regards.

The ribbon after three complete vibrations will be in the first loop, in the same place as when it started. It is fundamental to understand waves.

A wave can be defined as a type of disturbance that extends from a given site to another through space.

Moreover, light and sound can be considered vibrations capable of moving through space.

In this case, the motion of a ribbon is in a direction transversal to the direction of propagation of the wave.

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Answer:

8.09x10⁻⁵M of Fe³⁺

Explanation:

Using Lambert-Beer law, the absorbance of a sample is proportional to its concentration.

In the problem, the Fe³⁺ is reacting with KSCN to produce Fe(SCN)₃ -The red complex-

The concentration of Fe³⁺ in the reference sample is:

4.80x10⁻⁴M Fe³⁺ × (5.0mL / 50.0mL) = 4.80x10⁻⁵M Fe³⁺

Because reference sample was diluted from 5.0mL to 50.0mL.

That means a solution of  4.80x10⁻⁵M Fe³⁺ gives an absorbance of 0.512

Now, as the sample of the lake gives an absorbance of 0.345, its concentration is:

0.345 × (4.80x10⁻⁵M Fe³⁺ / 0.512) = 3.23x10⁻⁵M.  

As the solution was diluted from 20.0mL to 50.0mL, the concentration of Fe³⁺ in Jordan lake is:

3.23x10⁻⁵M Fe³⁺ × (50.0mL / 20.0mL) = 8.09x10⁻⁵M of Fe³⁺

The concentration of  Fe³⁺ in Jordan Lake is = 8.09* 10⁻⁵ M  

According to Lambert-Beer law ;The rate of absorbance of a sample is directly proportional to concentration of the sample

The reaction that produces a red complex

Fe³⁺ + KScN ----> Fe ( SCN )₃  ( red complex )

First step:  Determine the Concentration of  Fe³⁺ in  reference sample

= 4.80x10⁻⁴ *  ( 5.0 / 50.0 ) = 4.80 * 10⁻⁵M  

reference sample was diluted from 5.0 mL to 50.0 mL

∴ Concentration of 4.80 * 10⁻⁵M  has an absorbance = 0.512

Given that Lake sample absorbance = 0.345

Next step : Determine the concentration of the lake sample

Concentration of lake sample :

= absorbance of lake sample * ( conc of reference sample / absorbance )

= 0.345 *  (  4.80* 10⁻⁵ / 0.512  )  = 3.23* 10⁻⁵M.

Final step : Determine the concentration of Fe³⁺ in Jordan  lake

=  3.23 * 10⁻⁵ *  ( 50.0mL / 20.0mL) = 8.09* 10⁻⁵ M  

Note :  Solution  was diluted from 20.0 mL to 50.0 mL

Hence we can conclude that The concentration of  Fe³⁺ in Jordan Lake is = 8.09* 10⁻⁵ M  .

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The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

D: Increasing temperature

Explanation:

From collision theory, we know that the more the increase in collisions, the faster the rate of the chemical reaction.

Now, the amount of solid solute in a solvent will change with a corresponding change in temperature. What we mean is that, the higher the temperature increases, the higher the number of collisions between the solvent molecules as well as leading to an increase in the solute particles which will mean an increase in the amount of the solid solute dissolved. The correct answer is option D.

Answer:

Increasing temperature.

Explanation:

Answer: Describe why objects in space behave in a certain way

Explanation: Got it right on the test

Answer:b

Explanation:test

The biological process in an organism that produces methane is called methanogenesis.

Methanogenesis,  can as well be regarded as the biomethanation, which can be consiered as a form of anaerobic respirationwhereby there is a utilization of the carbon as the terminal electron acceptor, resulting in the production of methane.

It shoud be noted that Methanogenesis do follows the process of anaerobic respiration here there is a generation of methane as the final product of metabolism in theprocess the organic matter such as glucose is oxidized to CO2, however in hydrogenotrophic methanogenesis, H2 is oxidized to H+.

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complete qustion;

What is biological process in an organism that produces methane​

Answer:

It produces magnesium oxide and hydrogen gas.

Explanation:

When magnesium burns with steam it produces magnesium oxide which is white in color and hydrogen gas. When magnesium burns, it mixes with the oxygen present in the air produces magnesium oxide in powder form. Magnesium react with oxygen by giving two electrons present in its valance shells while the oxygen needs two electron for completing their valance shell and becomes stable.

Answer:

C. Because Earth travels around the sun

Answer:

C. the uneven heating of Earth's surface

The m/z that can be seen in propan - 1 ol but not propan - 2 ol is m/z = 15

The distribution of ions produced by a sample in a mass spectrometer is depicted graphically as the mass spectrum.  A sample is ionized in a mass spectrometer, where the resultant ions are sorted according to their m/z ratio.

Each peak in the mass spectrum corresponds to a certain m/z ratio and represents one of the several ions that the sample produced. Thus the propan - 1 ol has the m/z = 15

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Answer:

the concentration of sulphuric acid is 14mol/l

The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

The term vapor pressure is defined as the tendency of a material to change into the vapour state, and it increases with temperature.

For calculating mole fraction of C₂H₄Br₂ as follows

X C₂H₄Br₂ = moles of C₂H₄Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 0.3 / 0.3 + 1.80

= 0.14

For calculating mole fraction of C₃H₆Br₂ as follows:

XC₃H₆Br₂ =  moles of C₃H₆Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 1.80 / 2.1

= 0.85

For calculating total vapor pressure as follows:

P total = [ ( 0.14 × 127) + (0.85 × 173) ]

= 17.78 + 147.05

= 164.83 torr

Thus, The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

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A solution containing a KCl dissolved in water will have a higher boiling point and a lower freezing point than that of pure water.

Elevation in boiling point is a phenomenon that describe the boiling point of a liquid will be higher when another compound is added. Which means a solution has higher boiling point than pure solvent .

Depression in freezing point is a phenomenon that describe the freezing point of a liquid will be lower when another compound is added. Which means a solution has lower freezing point than pure solvent.

Thus, The boiling point and the freezing point of a solution of KCl in water will be greater and lower, respectively, than that of pure water.

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B. An electron EMITS a photon as it goes from a HIGHER TO LOWER energy level.

When an electron in an atom drops from a higher energy level to a lower energy level, it releases energy in the form of a photon.

What is Spectrum?

In science, the term "spectrum" is often used to describe the range of colors of visible light, known as the "visible spectrum," which includes all the colors of the rainbow. This spectrum is produced when white light is dispersed into its component colors by a prism or other means.

This energy is specific to the atom and its electron configuration, which is why each atom emits a unique set of wavelengths, creating a distinct emission spectrum.

Since the emission spectrum in the question has a line in the blue region, it means that the energy released by the electron corresponds to a specific frequency or wavelength in the blue region of the visible spectrum.

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