What element does this model represent?

A
Potassium

B
Sodium

C
Oxygen

D
Boron

Answer:

Explanation:

Molecular reaction

Zn + Cu( NO₃ )₂ = Zn( NO₃ )₂ + Cu

Complete reaction

Zn + Cu⁺² + 2 NO₃⁻ =  2 Zn⁺² + 2 NO₃⁻ + Cu

net ionic reaction

Zn + Cu⁺² = Zn⁺² + Cu

Answer:

2.9 g

Explanation:

The computation of the mass of oxygen gas produced is shown below:

As we know that

[tex]2NH_4ClO_4 \rightarrow N_2 + Cl_2 + 2O_2 + 4H_2O[/tex]

Now

The [tex]NH_4ClO_4[/tex] presented in 9.6g = 9.6 g/117.49 g/mol  

And, the mole ratio between the [tex]NH_4ClO_4 : H_2O[/tex] is 1 : 2

The moles of [tex]H_2O[/tex] produced is 2 × 9.6 g/117.49 g/mol

So,

Mass of H2O produced is

= 18.015 g/mol × 2 × 9.6 g/117.49 g/mol

= 2.94 g

Answer:

The molar mass is 210.49 g/mol

Explanation:

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: Option 2, The ability to do work.

Explanation: Edge

Energy can be defined as:

B. the ability to do work, It can of many forms.

Energy is the capacity of an item to take care of business. It might exist in potential, motor, warm, electrical, substance, atomic, or other different structures. As per the work-energy hypothesis, the work done is put away in the energy of the body.

Thus, option B is correct.

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Explanation:

In the reaction of magnesium with hydrochloric acid magnesium chloride and hydrogen gas is formed.

Equation -

Mg + 2HCl → MgCl₂ + H₂↑

Therefore,

Option A is correct ✔.

Answer:

Its A

Explanation: Just took the Pre-Unit test

Answer:

[tex]m_{HCl}^{leftover}=7.50g[/tex]

Explanation:

Hello.

In this case, since the undergoing chemical reaction is:

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]

In order to identify the limiting reactant, we compute the available moles of sodium hydroxide (molar mass = 40 g/mol) and the moles of hydrochloric acid consumed by those moles via their 1:1 mole ratio considering the chemical reaction:

[tex]n_{HCl}=25.0gNaOH*\frac{1molNaOH}{40gNaOH} *\frac{1molHCl}{1molNaOH} =0.625molHCl[/tex]

Next, since the molar mass of hydrochloric acid is 36.46 g/mol, we compute the mass of that reactant that is actually consumed:

[tex]m_{HCl}=0.625molHCl*\frac{36.46gHCl}{1molHCl}=22.8gHCl[/tex]

In such a way, the leftover of HCl is:

[tex]m_{HCl}^{leftover}=30.3g-22.8g\\\\m_{HCl}^{leftover}=7.50g[/tex]

Best regards!

Answer:

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

Step-by-step explanation:

I hope this helps!

natural selection

Explanation:

Answer:

Option B. 71.4 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 69.95 amu

Abundance (A%) = 25.7%

Isotope B:

Mass of B = 71.95 amu

Abundance (B%) = 74.3%

Average atomic mass =..?

The average atomic mass of the element can be obtained as shown below:

Average atomic mass = [(Mass of A × A%)/100)] + [(Mass of B × B%)/100)]

= [(69.95 × 25.7)/100] + [(71.95 × 74.3)/100]

= 17.977 + 53.459

= 71.436 ≈ 71.4 amu

Therefore, the average atomic mass of the element is 71.4 amu

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:

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:

Answer:

Explanation:

 pH = 5.7

- log [ H⁺ ] = 5.7

[ H⁻ ] = 10⁻⁵°⁷ M

= 2 x 10⁻⁶ M

[ H⁺ ] x [ OH⁻ ] = 10⁻¹⁴

2  x 10⁻⁶ x [ OH⁻ ] = 10⁻¹⁴

[ OH⁻ ] = .5 x 10⁻⁸ M

= 5 x 10⁻⁹ M

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of reaction is always conserved. Therefore, the mass of the mixture is 1025g. the correct option is option C.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

mass of salt+ mass of water=mass of solution

mass of salt =25 grams

mass of water=1,000 grams

substituting the given values, we get

25 grams+ 1,000 grams =mass of solution

mass of solution=1025g

Therefore, the mass of the mixture is 1025g. the correct option is option C.

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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:

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:   Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds.

Explanation: Due to atoms and science ;)

Answer:

throught transferring or sharing an electron

Explanation:

a p e x :)))

Answer:

62.6 %

Explanation:

Pb(NO₃)₂  = 207 + 124 = 331 gram

331 gram of lead nitrate contains 207 grams of lead

100 gram of lead nitrate contains

207 x 100 / 331  = 62.6 %

It can be deduced that percentage by mass of lead in Pb(NO₃)₂ is B. 62.6%.

From the given information, Pb(NO₃)₂ = 207 + 124 = 331 grams.

Therefore, 331 gram of lead nitrate contains 207 grams of lead. It can be deduced that 100 gram of lead nitrate will contain:

= 207 x 100 / 331

= 62.6 %

In conclusion, the correct option is 62.6%.

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Answer:

4

Explanation:

H2S(g) + O2(g) → S8(l) + H2O(g)

Upon balancing the equation;

8H2S(g) + 4O2(g) → S8(l) + 8H2O(g)

The coefficient of O2 in the reaction above is 4.

Answer:

A is the correct answer

Explanation:

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.

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:

9

Explanation:

Answer:

9

because i studied this

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:

The addition of NH₃⁺

Explanation:

A buffer is an aqueous mixture of a weak acid and its conjugate base or vice versa.

In ammonium iodide, NH₄I, the ions in solution are ammonium ion, NH₄⁺ and iodide ion, I⁻.

The iodide ion is the conjugate base of the HI, a STRONG ACID, that means the addition of HI in solution wouldn't produce a buffer.

And, NH₄⁺ is the conjugate acid of the NH₃, a WEAK BASE, that means the addition of NH₃ to the solution will produce a buffer: The mixture of a weak base, NH₃ and its conjugate acid, NH₄⁺

Answer:

3

Explanation:

I have indeed already took the quizzes my friend

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.