What is the number of atoms in 2.65g of CH 4

Answer:

Explanation:

k = 1.8 x 10⁻⁴ s⁻¹

no of moles initially = 2.45 x .17 = .4165 moles

initial moles a = .4165

k = (1 / t ) ln a / ( a - x )

a is initial moles , x is moles reacted .

a is initial moles , x is moles reacted .

time t = 195 min = 11700 s

1.8 x 10⁻⁴ = 1 / 11700 x ln .4165 /( .4165 - x )

2.106 = ln .4165 /( .4165 - x )

.4165 /( .4165 - x ) = e²°¹⁰⁶ = 8.215

.4165 = 3.42 - 8.215 x

8.215 x = 3.0035

x = .3656

moles of sucrose hydrolysed = .3656 moles.

Answer:

Option C. 1.60×10¯²¹ J

Explanation:

The following data were obtained from the question:

Frequency (f) = 2.40×10¹² Hz

Energy (E) =..?

We can obtain the energy of the photon of the infrared light by applying the following formula:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

Frequency (f) = 2.40×10¹² Hz

Planck's constant (h) = 6.63×10¯³⁴ Js

Energy (E) =..?

E = 6.63×10¯³⁴ × 2.40×10¹²

E = 1.60×10¯²¹ J

Thus, the energy of the photon of the infrared light which has a frequency of 2.40×10¹² Hz is 1.60×10¯²¹ J

According to the law of energy, it states that energy can never be created nor be destroyed. It can only transfer from one thing to another.

These are the various type of energy:-

We can obtain the energy of the photon of the infrared light by applying the following formula:

Energy (E) = Planck's constant (h) × frequency (f)  

[tex]E = hf[/tex]

After putting the value:-

[tex]E = 6.63 * 10^3^4 * 2.40*10^1^2[/tex]

After solving the equation, the energy is:-

E = 1.60×10¯²¹ J

Thus, the energy of the photon of the infrared light which has a frequency of 2.40×10¹² Hz is 1.60×10¯²¹J

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Answer: It will kind of make like a type of tough or soft dough

Explanation: If you add too much water it might be a dough that bearly tays together or is very soft, but if you add too little it will be hard to mold. The reason it forms a sort of consistency like this is because When water is added to flour and mixed, these proteins absorb water, otherwise known as hydrating. Gliadin and Glutenin then combine to form the protein called GLUTEN. ... When flour is mixed with water, the gluten swells to form a continuous network of fine strands.

Answer:

The molar mass is 210.49 g/mol

Explanation:

Answer:

Yes, the intensity of the laser does affect the amount of current that flows through the photo tube. The more intense the light, the more electrons are expelled, and thus the higher the current.

Explanation: Hope this helps!

Yes, the intensity of the laser does affect the amount of current that flows through the photo tube.

Laser light is a form of electromagnetic radiation and should not be confused with ultrasound or other electromedical therapies.

Laser light is of an electrical and magnetic character. Laser light can change the chemical structure of cells and tissue, which visible light cannot.

Thus laser light differs significantly from visible light.

The intensity of a laser beam is the optical power per unit area, which is transmitted through the target surface to the spread direction.

The units of the optical intensity  are W/m2 or more commonly W/cm2.

Therefore ,we can conclude that laser light does effect the amount of current that flows through phototube.

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Alma is using ATC-PC which is a quick fuel source. Which is the first energy used in short and quick uses of energy.  While it gives the max energy at first, after about 10 seconds it runs out. Which then short term energy starts. Which uses carbs as energy. This gets to max energy after a little bit and after a few minutes, it starts to run out. Then long term energy kicks in. This uses oxygen to provide energy, while it lasts for a long time, it takes time to reach max energy.  This can also fail if your respiratory system or cardiovascular system can't provide enough oxygen.

Answer:

Explanation:

The Chromite ore is used for the production of Chromate/dichromate formation.

[tex]4FeCr2O4 + 8Na2CrO4+7O2 \\[/tex] →[tex]8NaCrO4 +2Fe2O3 +8CO2\\yellow[/tex]

so[tex]Na2CrO4[/tex] is called Chromite ore which is of yellow color.

[tex]Na2CrO4 +2H^+[/tex] → [tex]Na2CrO4 +2Na^+ +H2O[/tex]

                                [tex]Orange[/tex]

so when sodium chromate is reacted with hydrogen ion it forms sodium dichromate which is of orange color

Now

[tex]Na2Cr2O7+2KCl[/tex]→[tex]K2Cr2O7 + NaCl[/tex]

The chromate and dichromate are interconvertible in aqueous solution depending upon the PH of solution

Acid medium: [tex]Cr2O4^2-[/tex] [tex]2H^+[/tex]→[tex]Cr2O7^2-[/tex][tex]+H2O[/tex]

Base:[tex]Cr2O7^2- +2OH^-[/tex]→  [tex]CrO4^2- +H2O[/tex]

Hence Chromate and dichromate are interconvertible and hold and equilibrium.

Answer:

I think Mary's and Alan's Methods are wrong. Jack is correct.  

Explanation:

(M1)(%)+(M2)(%)+(M3)(%)

You will be mulitplying the mass of Isotopes  by the percentages, (M1,2,3) are the isotopes. Then you just add the three to get the average.

There isn't any division involved.

Answer:

D. What do cuttlefish have in common?

Explanation:

A P E X 2021 :)

The  question that a scientist might ask about cuttlefish is, "What do cuttlefish have in common that is present in Option D?" as the cuttlefish is an invertebrate and a member of the phylum Mollusca.

The phylum Mollusca includes the octopus, cuttlefish, and other aquatic animals with soft bodies that can easily blend in with the background in order to capture prey or avoid the predator, and they have other adaptations too, such as the digestive system and other organs, as they are organ-level organisms. They have the outer hard shell that is present in the snail, and they can reproduce sexually and show larval forms of development.

Hence, the question that a scientist might ask about cuttlefish is, "What do cuttlefish have in common that is present in Option D?" as the cuttlefish is an invertebrate and a member of the phylum Mollusca.

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Answer:

Well to start, as fragile as the eggs are, there should be a more durable material you feel me? Like maybe try something such as a rubbery product but one that isn't so tough on outside but not too soft on the inside. Basically a cushion but where is accessible for the eggs. We also dont want a material that is way to hard because it leaves no room for the eggs and its a very difficult workspace.

Explanation:

Hope this helps and good luck on your project :)

Answer:

the answer is a          shh /..\  yall smell that

Explanation:

Answer:

[tex]\frac{250}{23}[/tex]

Step-by-step explanation:

I hope this helps!

Answer:

3

Explanation:

I have indeed already took the quizzes my friend

Answer:

oxygen has 6 valence electrons

Explanation:

it is in group 16

Answer:

Oxygen has a total of 6 valence electrons.

Explanation:

I have the class and we recently went over this.

Answer:

Standard solution

Explanation:

The correct answer would be a standard solution.

By definition, a standard solution is a solution whose concentration is known and which is often used to determine the concentration of other substances in, for example, titration. The process of using a solution of known concentration to determine the concentration of another substance is known as standardization.

Answer:

Sublimation

Explanation:

Answer:

sublimation

Explanation:

Sublimation is the process solid changes to gas without passing the liquid phase. An example of a substance that sublimes is napthalene.

natural selection

Explanation:

Answer:

false

Explanation:

Explanation:

Lewis Dot Diagrams are represented by the element name in the middle, the same as in the periodic table, and is surrounded by dots that represent the elements valence electrons.

Answer:

a) Not acidic

b) Not acidic

Explanation:

To determine if a solution is acidic, we need to calculate the pH. If the pH < 7, the solution is acidic.

a) A solution with [H₃O⁺] = 2.5 × 10⁻⁸ M

We will use the following expression.

pH = -log [H₃O⁺] = -log 2.5 × 10⁻⁸ = 7.6

Since the pH > 7, the solution is not acidic

b ) A solution with [OH⁻] = 1.0 × 10⁻⁷M

First, we will calculate the pOH.

pOH = -log [OH⁻] = -log 1.0 × 10⁻⁷ = 7.0

Then, we will calculate the pH.

pH = 14.0 - pOH = 14.0 - 7.0 = 7.0

Since the pH is 7, the solution is not acidic.

Answer:

A).

ΔH is positive, Therefore reaction is endothermic

B).

ΔG = ΔH - T∙ΔS

= 98.4 kJ/mol - 300K ∙ 0.09564 kJ/molK

= 69.7 kJ/mol

C).

ΔG is positive, Therefore reaction is non-spontaneous

Explanation:

look i know that its not a drawing but its the best that i can do with what i have. i hope this helps!

Answer:

[tex]\%Ag_2O=41.8\%[/tex]

Explanation:

Hello.

In this case, for the reaction:

[tex]2 Ag_2O(s) \rightarrow 4 Ag(s) + O_2(g)[/tex]

As 13.8 mL (0.0138 L) are collected at 27 °C and 1.00 atm, we can compute the yielded moles of oxygen via the ideal gas equation as shown below, considering that the pressure of oxygen is equal to the total pressure minus the vapor pressure of water (26.7 mmHg=0.035atm):

[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{(1.00atm-0.035atm)*0.0138L}{0.082\frac{atm*L}{mol*K}*300K} =5.41x10^{-4}molO_2[/tex]

Next, via the 1:2 mole ratio between oxygen and silver oxide (molar mass = 231.735  g/mol) in the chemical reaction, the mass of pure silver oxide turns out:

[tex]m_{AgO_2}=5.41x10^{-4}molO_2*\frac{2molAgO_2}{1molO_2} *\frac{231.735gAgO_2}{1molAgO_2} \\\\m_{AgO_2}=0.251gAgO_2[/tex]

In such a way, the percent by mass of silver oxide in the 0.600-g sample is:

[tex]\%Ag_2O=\frac{0.251g}{0.600g}*100 \%\\\\\%Ag_2O=41.8\%[/tex]

Best regards.

There is  42.5% of Ag2O in the sample.

The equation of the reaction is;

2 Ag2O(s) -------> 4 Ag(s) + O2(g)

Volume of the oxygen gas = 13.8 mL or 0.0138 L

Temperature of gas = 27°C + 273 = 300 K

Pressure of the gas = 1 atm - 0.035atm = 0.965 atm

Gas constant = 0.082 atm LK-1mol-1

From;

PV = nRT

n = PV/RT

n = 0.965 atm × 0.0138 L/0.082 atm LK-1mol-1 × 300 K

n = 0.000541 moles

If 2 moles of Ag2O yields 1 mole of oxygen

x moles of Ag2O yields 0.000541 moles of oxygen

x = 2 moles ×  0.000541 moles/ 1 mole

x = 0.0011 moles of Ag2O

Mass of Ag2O = 0.0011 moles × 232 g/mol = 0.255 g

Mass percentage of Ag2O =  0.255 g/0.600 g × 100/1

= 42.5%

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The possible quantum numbers for 5f are :

Each orbital in an atom consists of 4 quantum numbers  

n is the principal quantum number ---> describes the size of the orbitals  

l is the angular momentum / azimuthal quantum number -> describes the shape of the orbitals.  

ml, the magnetic quantum number -> describes the orientation of orbitals in space  

ms, the electron-spin quantum number ---> describes the spin of electrons  

Value of n: positive integer  

value of l: s = 0, p = 1, d = 2, f = 3, ... (n-1)  

ml value: between -l to + l  

ms value: +1/2 or -1/2  

So the possible quantum numbers for 5f are :

Because the answer choices are not very clear, please see the composition I have described above

Answer:

Explanation:

The elements in Group 1A elements are Lithium, Sodium, Potassium, Rubidium, Caesium, and Francium(radioactive). The valence shells of the members have the electronic configuration of ns¹ where n =2,3,4,5,6,7. They are known as alkali earth metals. Their chemistry is dominated by the only electron in the outer shell of their atoms. Thus, they are powerful reducing agents because of their ability to lose this outer shell electron readily.

Thus ns' electrons in Group 1A require lesser energy for ionization in the case of elements of Group 1A; this explains why Group 1A elements are more reactive.

On the other hand, the Group 1B elements outer ns' electrons are less effectively shielded by the inner d electrons; therefore, the outer electrons in case of Group 1B feel more nuclear pull (due to positively charged protons in the nucleus) as compared to the nuclear pull in Group 1A elements. Thus electrons require more energy for ionization in the case of elements of Group 1B. This explains why Group 1B elements are less reactive than elements of Group 1A.

Answer:

C, B, D, A

Explanation:

Dalton's model - 1803

J.J Thomson's model - 1904

Rutherford's model - 1911

Bohr's model - 1913

Answer:

V2 = 50.67mL or 50.67cm^3

Explanation:

using the general gas law formula

(P1V1)/T1 = (P2V2)/T2

Where P1=760.0mmHg

P2=500.0mmHg

V1=250.0mL

V2=?

T1=27.0°C = 273+27=300K Note: constant temperature unit must be in Kelvin

T2=400k

Appling the formula

(P1V1) /T1 = (P2V2) /T2

Cross multiply

P1V1T2 =P2V2T1

Divide through by P2T1

therefore: V2= (P1V1T2) /(P2T1)

Inserting the values

V2=(760×25.0×400) /(500×300)

V2=(7600000) /(150000)

V2=50.67mL

Note: 1mL = 1 cm^3 therefore: V2= 50.67mL or 50.67cm^3

Answer:

The shape around the carbon is linear . Sp hybridisation generally tends to be linear.

Explanation:

The hybridization procedure includes blending of the valence s orbital with one of the valence p orbitals to yield equal sp hybrid orbitals which can be orientated in a linear geometry. The p orbital is one orbital that could keep up to 2 electrons. The sp set is equal orbitals that factor 180° from every other.

Hence , the answer is linear shape around the carbon.

Answer:

5.66g of Cu(OH)2 can be produced

Explanation:

Cu(NO3)2 reacts with KOH, as follows:

Cu(NO3)2 + 2KOH → Cu(OH)2 + 2KNO3

76.0mL of 0.764M Cu(NO3)2 are, in moles:

0.0760L * (0.764mol / L) = 0.0581 moles Cu(NO3)2

As 1 mole of Cu(NO3)2 produce 1 mole of Cu(OH)2, the moles of Cu(OH)2 produced are 0.0581 moles Cu(OH)2.

Molar mass of Cu(OH)2 is 97.561g/mol. In 0.0581 moles there are:

0.0581 moles Cu(OH) * (97.561g / mol) =

Answer:

this the one i needed help on pleasee sb help meh out

Explanation:

Answer:

A cold front is moving to the north and west before a warm front moves through.

Explanation: