help with this question please i will mark you brainliest!!!

Answer:

The laboratory demonstration consists of the following;

The compounds present in the combustion reaction = Methane, CH₄ and Oxygen, O₂

The chemical equation for the combustion reaction is given as follows;

CH₄ + 2O₂ → CO₂ + 2H₂O

Therefore;

A. The equation given as CH₄ + O → CO₂ is not correct because;

1) Oxygen gas exist as diatomic molecules, O₂, and given that the experiment involves the mixture of gases, the oxygen gas present which can exist as a separate compound, should be represented as O₂

2) The number of oxygen molecules in the reaction is two rather than one

3) The product also includes two molecules of water (vapor) H₂O

B. The correct equation for the reaction should be given as follows;

CH₄ + 2O₂ → CO₂ + 2H₂O

B i) The constituents of the equation is obtained by the knowledge of the fact that the combustion reaction of an organic substance such as methane in the presence of oxygen yields, carbon dioxide and water (vapor)

The equation showing the relative amounts the reacting compounds is by balancing the basic equation of the combustion of methane in the presence of oxygen

Explanation:

1. solute is the substance that is being dissolve,while solvent is dissolving medium

2.saturated is solution that contain maximum amount of solut that capable of being dissolve and supersaturated is solution that contain less amount or medium of solut that capable being dissolve : example vinger

3. is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2 H2, and two molecules of water would be written 2 H2O . yes it's can be change only in caseWhen you balance an equation you can only change the coefficients

Answer:

Ga-135 is the largest atomic radius because B atomic radius is 85

Answer:

I believe its A. Mass

Explanation:

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.

Answer:

B. Magnetism

Explanation:

Hope this helps! :))
Sorry for late answer

Answer:

c maybe sorry if its wrong

Explanation:

A “supersaturated” solution contains more dissolved material. supersaturated solutions lies in the temperature of the water. more sugar will dissolve in hot water than in cold. Meaning that by separating the 2, only the supersaturated sugar would dissolve leaving the regular sugar untouched.

Answer:

I believe they can if it's a small town/village

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question we have

[tex]density = \frac{2.06}{3.10} \\ = 0.664516..[/tex]

We have the final answer as

Hope this helps you

Answer:

Volume

Mass

Size

Weight

Length

Explanation:

Extensive properties do depend on the amount of matter that is present. An extensive property is considered additive for subsystems. Examples of extensive properties include:

Volume

Mass

Size

Weight

Length

Explanation:

You're mixing magnesium nitrate, Mg(NO3)2 , and sodium carbonate, Na2CO3 , two soluble ionic compounds that dissociate completely in aqueous solution to form cations and anions.

Answer:

alpha decay, beta decay, gamma decay

Answer:freezing can occur

Source:trust me bro

Answer:

B. Most potential energy

Explanation:

brainest plz

Answer:

The official measurement unit for energy is the Joule (J). Among the most common units measuring energy mention should be made of the kilowatt/hour (kWh), used especially for electric energy (in fact it is used to calculate electricity bills).

Answer:

the answer is B Astroid Belt

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 20 × 4

We have the final answer as

Hope this helps you

Answer:

80 n

Hope I helped

Answer:

so you like fortnite but it's bad rjfbfbhrr

Answer:

The answer is 2

Explanation:

when viewed from earth number 2 would be a waning gibbous

Answer:

the full viral genome is retained in the host cell, but its expression is dramatically restricted, such that few viral antigens and no viral particles are produced.

Explanation:

Answer:

A and C

Explanation:

I took the test

Answer:

First question

       [tex]Q = 36826 \ J[/tex]

Second  question  

       [tex]Q = 52299.7 \ J[/tex]

Explanation:

From the question we are told that

     The melting point of Ethanol is  [tex]T_m = -114 ^oC[/tex]

      The boiling point of Ethanol is  [tex]T_b = 78^ oC[/tex]

       The enthalpy of fusion of Ethanol is [tex]F = 5.02 \ kJ / mol = 5.02 *10^{3}\ kJ / mol[/tex]

        The enthalpy of vaporization  of Ethanol is [tex]L = 38.56 \ kJ / mol = 38.56 *10^{3} \ J / mol[/tex]

         The specific heat of solid Ethanol is  [tex]c_e = 0.97 \ J/ g \cdot K[/tex]

          The specific heat of liquid  Ethanol is [tex]c_l = 2.3 \ J / g \cdot K[/tex]

           The mass of the Ethanol given is  [tex]m = 35.0 \ g[/tex]

Considering the first question

           The initial  temperature is [tex]T_i = 27^oC[/tex]

             The final  temperature is  [tex]T_f = 120^oC[/tex]

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       [tex]Q_1 = m * c_l * (T_b - T_i)[/tex]

=>      [tex]Q_1 = 35.0 * 2.3 * ( 78 - 27)[/tex]

=>      [tex]Q_1 =4106 \ J[/tex]

Genially the number of moles of Ethanol given is mathematically represented as

         [tex]n = \frac{m}{Z}[/tex]

Here Z  is the molar mass of Ethanol  with value  [tex]Z = 46 g/mol[/tex]

So

         [tex]n = \frac{35}{46 }[/tex]

=>      [tex]n = 0.7609 \ mol[/tex]

Generally the heat of vaporization of the Ethanol is mathematically represented as

         [tex]Q_2 = n * L[/tex]

=>        [tex]Q_2 =0.7809 * 38.56 * 10^{3}[/tex]

=>        [tex]Q_2 =29339 \ J[/tex]

Generally the heat required too raise the Ethanol from  its boiling point to  [tex]T_f[/tex]  is  mathematically represented as

       [tex]Q_3 = m * c_l * (T_f - T_b)[/tex]

=>     [tex]Q_3 = 35 * 2.3 * (120 - 78 )[/tex]

=>     [tex]Q_3 = 3381 \ J[/tex]

Generally the total heat required is  

     [tex]Q = Q_1 + Q_2 + Q_3[/tex]

=>   [tex]Q = 4106 + 29339 + 3381[/tex]

=>   [tex]Q = 36826 \ J[/tex]

Considering the second question

           The initial  temperature is [tex]T_i = -120^oC[/tex]

             The final  temperature is  [tex]T_f = 120^oC[/tex]

Generally the heat required too raise the Ethanol to its melting  point is mathematically represented as

       [tex]Q_1 = m * c_e * (T_m - T_i)[/tex]

=>      [tex]Q_1 = 35.0 * 0.97 * ( -114 - (- 120) )[/tex]

=>      [tex]Q_1 = 203.7 \ J[/tex]

Generally the heat of fusion  of the Ethanol is mathematically represented as

                 [tex]Q_2 = n * F[/tex]

=>        [tex]Q_2 =0.7809 * 5.02 *10^{3}[/tex]

=>        [tex]Q_2 =3920 \ J[/tex]

Generally the heat required too raise the Ethanol to its boiling point is mathematically represented as

       [tex]Q_3 = m * c_l * (T_b - T_m)[/tex]

=>      [tex]Q_3 = 35.0 * 2.3 * ( 78 - (- 114) )[/tex]

=>      [tex]Q_3 =15456 \ J[/tex]

Generally the heat of vaporization of the Ethanol is mathematically represented as

         [tex]Q_4 = n * L[/tex]

=>        [tex]Q_4 =0.7809 * 38.56 * 10^{3}[/tex]

=>        [tex]Q_4 =29339 \ J[/tex]

Generally the heat required too raise the Ethanol from  its boiling point to  [tex]T_f[/tex]  is  mathematically represented as

       [tex]Q_5 = m * c_l * (T_f - T_b)[/tex]

=>     [tex]Q_5 = 35 * 2.3 * (120 - 78 )[/tex]

=>     [tex]Q_5 = 3381 \ J[/tex]

Generally the total heat required is  

     [tex]Q = Q_1 + Q_2 + Q_3+Q_4 + Q_5[/tex]

=>   [tex]Q = 203.7 + 3920 + 15456 +29339+3381[/tex]

=>   [tex]Q = 52299.7 \ J[/tex]

The molecular mass​ : 81.72 g/mol

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm , N/m²

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)

T = temperature, Kelvin  

P = 760 mmHg=1 atm

T = 300 K

V = 0.3 L

Number of moles :

[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1\times 0.3}{0.082\times 300}\\\\n=0.0122[/tex]

The molecular mass (MW) :

[tex]\tt MW=\dfrac{mass}{n}\\\\MW=\dfrac{0.997~g}{0.0122}\\\\MW=81.72~g/mol[/tex]

Answer:

P(N₂) = 2.5 atm

Explanation:

Given data:

Total pressure of gasses = 6.7 atm

Partial pressure of O₂ = 3.0 atm

Partial pressure of CO₂ = 1.2 atm

Partial pressure of N₂ = ?

Solution;

According to Dalton law of partial pressure,

The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.

Mathematical expression:

P(total) = P₁ + P₂ + P₃+ ............+Pₙ

Now we will solve this  problem by using this law.

P(total) = P(O₂)  + P(CO₂) + P(N₂)

6.7 atm = 3.0 atm + 1.2 atm + P(N₂)

6.7 atm = 4.2 atm + P(N₂)

P(N₂) = 6.7 atm - 4.2 atm

P(N₂) = 2.5 atm

Explanation:

A dependent variable depends on the independent variable. The independent variable is what you usually control in a experiment.

Answer:

a1

The main difference between SPECT and PET scans is the type of radiotracers used. While SPECT scans measure gamma rays, the decay of the radiotracers used with PET scans produce small particles called positrons. A positron is a particle with roughly the same mass as an electron but oppositely charged.

Explanation:

a2

While imaging tests such as X-rays can show what the structures inside your body look like, a SPECT scan produces images that show how your organs work. For instance, a SPECT scan can show how blood flows to your heart or what areas of your brain are more active or less active.

a3

PET and SPECT have been extensively evaluated as diagnostic procedures for dementia. Substantial progress has been made in developing radioligands that bind to amyloid deposits in the brain, which should provide new opportunities for early diagnosis and treatment monitoring in Alzheimer's disease

a4

What are the disadvantages of spect as compared to pet?

However, SPECT has issues, including long scan times and low-resolution images prone to artifacts and attenuation. Some artifacts can easily be misidentified as perfusion defects. SPECT also does not provide a quantifiable estimate of the blood flow, whereas PET does, experts say.

Answer: 30.24 m/s

Explanation:

Got it right on test