The greatest distance across the moon's orbit is 772,000 km; the eccentricity of its orbit is 0.055. How far
apart are the foci of the moon's orbit?

A) The work you do on the pumpkin is 31.36 J as you lift it from the ground.

B) The work is zero as you carry it from the field.

Work can be defined as the energy spent when applying a force to move an object through a certain displacement.

The work by a force to move an object through a displacement (d) can be written as:

W = Fdcosθ

Where θ is angle between force and displacement.

(a) The mass, the displacement of the pumpkin from the ground, and the angle are:

m = 3.2 kg

d = 1.4 m

θ = 0∘

Here, the force exerted during lifting the pumpkin is equal to the weight of the pumpkin:

F = mg = (3.2)(9.8) = 31.36 N

Thus, the work done when lifting the pumpkin is

W = F d cosθ = (31.36 N)(1.4m)cos(0∘) = 44 J

(b) When carrying the pumpkin, the force exerted will be upward while the displacement of the pumpkin will always be directed forward. Therefore, they are perpendicular (i.e. θ = 90∘) to each other which is the reason why the work is zero.

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Answer:

Strength:

Weakness:

Yes, this replacement reaction 3Ca + Au₂S₃ → 3CaS + 2Au.

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions.

Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.

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Answer:

B.) 10.9 g

Explanation:

To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.

(Step 1)

1,000 mL = 1 L

 183 mL                1 L
--------------  x  -----------------  =  0.183 L
                        1,000 mL

(Step 2)

Molarity = moles / volume (L)                   <----- Molarity equation

0.400 M = moles / 0.183 L                        <----- Insert variables

0.0732 = moles                                        <----- Multiply both sides by 0.183

(Step 3)

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (N): 14.007 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)

Molar Mass (Mg(NO₃)₂): 148.313 g/mol

 0.0732 moles Mg(NO₃)₂             148.313 g
---------------------------------------  x  ---------------------  =  10.9 g Mg(NO₃)₂
                                                         1 mole

The two isotopes' relative abundances are: 121 antimony = 57.2% and

123 antimony = 42.8%.

The average mass of all antimony isotopes is 121.76 amu.

Taking into account your data,

(the sum of both abundances is 100%), and

120.904x+122.904y=121.76

Now, some high school algebra will assist us in understanding the solution.

= 120.904x+12.2904x=121.76x=0.572, and thus

x+ y= 1

∴y≈ 0.42

Results show that 121 Sb has a relative abundance of about 57.2% and 123 Sb has a relative abundance of about 42.8% when these decimals are converted into percentages.

There are 2 naturally occurring isotopes of antimony. Antimony-121 has a mass of 120.904 amu, and antimony-123 has a mass of 122.904 amu.

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Since Seismic waves travel at different speeds according to type, the speed of seismic waves from fastest to slowest is option C: P waves, S waves, L waves.

P waves leave the earthquake first and go the furthest. Rock oscillates perpendicular to the direction of wave propagation in S or shear waves. In rock, S waves typically move at a pace of roughly 60% that of P waves, and they always come after the latter.

Therefore, if we examine a seismogram, we anticipate that the P-wave, which is the quickest wave, will arrive first, followed by the S-wave and then the Love and Rayleigh waves, which are the slowest waves.

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The molality of 6.2g of LiBr in 52.6g water is 0.0013mol/kg

The molecular weight of LiBr is 86.845 g/mol thus substituting this value in the formula of moles,

Moles of LiBr = grams/molecular weight

Moles of LiBr = 6.20/ 86.845

Moles of LiBr = 0.071 mol

Substituting the value of moles in the formula of molality

Molality= moles/grams of solvent

Molality= 0.071/52.6

Molality= 0.0013 mol/g

Molality, or more specifically, the number of moles of solute contained in a kilogram of solvent, is a unit used to express the concentration of a solution.

The quantity of moles of solute per kilogram of solvent is known as molality, which is denoted by a tiny "m."

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Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

In the displacement reaction , one atom is displaced by the the another atom according to their reactive strength . the highly reactive atom displace the low reactive atom called as displacement reaction.

The reactions are given as :

FeSO₄  +  Zn  ---->  ZnSO₄   +   Fe

Fe(NO₃)₂   +  Zn ----->   Zn(NO₃)₂   +  Fe

Here the zinc is more reactive than the iron . so, Zinc displace the iron in both the cases. Zinc displace the iron in both the cases. The reaction is called as displacement reaction.

Thus, Comparing the results for each pair of tests, we conclude that Displacement reaction is taking place.

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The frequency of the color of red light that has a wavelength of 663nm is 4.52 × 10¹⁴Hz.

Frequency of a wave is the quotient of the number of times (n) a periodic phenomenon occurs over the time (t) in which it occurs.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

According to this question, the wavelength of a particular color of red light is 663nm. The frequency can be calculated as follows:

663 × 10-⁹ = 3 × 10⁸ ÷ f

f = 3 × 10⁸ ÷ 6.63 × 10-⁷

f = 4.52 × 10¹⁴Hz

Therefore, 4.52 × 10¹⁴Hz is the frequency of the color of the red light.

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2Na(s)+Cl2(g) 2NaCl(s) is the balanced equation.

However, closer examination of this equation reveals that, despite having one sodium atom on each side of the arrow, the reactants contain two chlorine atoms whereas the products have just one. This equation is invalid for use in chemical calculations because it is unbalanced.

Once more, chemical reactions never result in the creation or destruction of atoms. A balanced chemical equation is this kind of chemical equation. A chemical equation that complies with the law of conservation of matter is said to be balanced.

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The structural formula for 2,2-dimethylbutane in the above task is (CH3)3CCH2CH3.

The correct answer choice is option b.

It follows that the structural formula for the above compound in the above task has 4 carbon atoms as the parent chain and has 2 different methyl substituents on the same carbon 2.

The image to the paper work is attached for more clearity.

The compound; 2,2-dimethylbutane ( (CH3)3CCH2CH3 ) belong to an alkane family. They have a general formula CnH2n+2.

So therefore, we can now confirm from the explanation given above that the only correct answer for the structural formula of the compound above is (CH3)3CCH2CH3

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The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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Answer:

Qns no.3: it is not a correct answer

Explanation:

S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.

The empirical formulae of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

given that :

mass of potassium , K = 5.85 g

molar mass of potassium = 39 g/mol

mass of nitrogen , N = 2.10 g

molar mass of nitrogen = 14

mass of oxygen , O = 4.80 g

molar mass of oxygen = 16

now, we have calculate the number of mole for each atom :

number of moles of potassium , K = mass / molar mass

                                                         = 5.85 / 39

                                                         = 0.15 mol

number of moles of nitrogen , N = 2.10 / 14

                                                      = 0.15 mol

number of moles of oxygen , O = 4.80 / 16

                                                     = 0.3 mol

now, dividing by the smallest one , we get

moles of K = 0.15 / 0.15 = 1

moles of N = 0.15 / 0.15 = 1

moles of O = 0.3 / 0.15 = 2

The empirical formula = KNO₂

Thus, The empirical formula of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

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0.506 moles  of  aluminum are required to remove 0.253 mol of silver sulfide from a silver bowl.

3Ag2S(s) + 2Al(s) --> 6Ag(s) + Al2S3(s)

2 moles of Al required to make 1 mole  Al2S3

1 moles Al2S3= 2 moles Al

0.253 moles Al2S3 = 0.506 moles  Al

The mole idea facilitates the measurement of a material's amount. When interacting with particles at the atomic (or molecular) level, it is acknowledged that even a single gram of a pure element has a significant number of atoms. The mole theory is widely used in this context. The most often used unit of measurement is the "mole," which is a count of many particles.

The number 6.02214076*1023, also known as the Avogadro constant, is frequently denoted by the letter "NA". One of the most fundamental entities that may be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Answer:

After 1 month of use, the propane tank reads 81

Explanation:

Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.

given that :

molarity of MgO = 5 M

mass of MgO = 200 g

molar mass of MgO = 40 g/mol

number of moles = mass / molar mass

number of moles of MgO = 200 g / 40 g/mol

                                           = 5 mol

molarity of solution is given as :

molarity = moles of solute / volumes in L

volume = moles / molarity

volume = 5 × 5

             = 25 L

Thus, Volume of water will be needed to make a solution of 5.0 M MgO with 200 g MgO is 25 L.

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The enthalpy of the reaction 12173 J/°C

Heat capacity or thermal capability is a bodily belonging of count number, described as the quantity of warmth to be supplied to an object to provide a unit trade in its temperature. The SI unit of heat capacity is joule in line with kelvin. heat capacity is an intensive property.

Heat capability is described as the quantity of warmth strength required to raise the temperature of a given quantity of matter through one diploma Celsius. warmth ability for a given count depends on its length or amount and as a result, it's far an extensive asset. The unit of heat capacity is joule in line with Kelvin or joule according to degree Celsius.

Calculation:-

heat = msΔT

        = 0.50 × 3290 × (25.2 - 21.5)

         = 0.50 × 3290 × 3.7

          = 6086.5 J

q = mΔHf

ΔHf = q/m

       = 12173 J/°C

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2.5 moles of oxygen will be produced.

A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.

The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.

For the given reaction:

2H₂O₂ → 2H₂O + O₂

This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.

So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.

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The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is 6.36 * 10⁻⁷.

The solubility of a solution is the amount of solute present in a given volume of solvent.

The solubility of MgCO₃ in a solution that contains 0.055 M Mg²⁺ ions is calculated from the dissociation equation for the reaction given below:

The solubility product constant, Ksp =  [Mg²⁺] * [CO₃²⁻]

At equilibrium, [Mg²⁺] = 0.055 + x

[CO₃²⁻] = x

Assuming x is <<< 0.055, hence 0.055 + x = 0.055

Ksp = 0.055 * x

x = Ksp / 0.055

x = 3.5 × 10⁻⁸ / 0.055

x = 6.36 * 10⁻⁷

Hence, the solubility of MgCO₃ = 6.36 * 10⁻⁷

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The electrons that are being lost gained or shared by each atom are Shared electrons.

Atoms and chemical species lose and gain electrons as they react to gain stability. Therefore, metals usually donate electrons to nonmetals to form cations. The number of electrons depends on their position on the periodic table. When an atom gains an electron, its overall charge becomes negative.

When an atom loses an electron its overall charge becomes positive. When an atom gains or loses electrons, its mass does not change. The number of electrons an atom can lose and gain share during a chemical reaction is called its valence. An atom that loses an electron gains a positive charge because it has fewer negatively charged electrons to balance the positive charge of the protons in the nucleus.

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Answer: -210.08 J

Explanation:

Use the formula q = (m)(c)(ΔT)

q = (1.25)(2.02)(102.1-185.3)

q = -210.08 J

This is exothermic! Heat is lost.

The balanced net ionic equation for the reaction between potassium sulfide and lead(II) nitrate is Pb²⁺(aq) + S²⁻(aq) → PbS(s)

From the question, we are to write the balanced net ionic equation for the given chemical reaction.

The given chemical reaction is

K₂S(aq) + Pb(NO₃)₂(aq) →

The between potassium sulfide and lead(II) nitrate will produce potassium nitrate and lead sulfide.

That is,

K₂S(aq) + Pb(NO₃)₂(aq) → KNO₃(aq) + PbS(s)

Now, balance the equation

K₂S(aq) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + PbS(s)

Write the complete ionic equation

2K⁺(aq) + S²⁻(aq) + Pb²⁺(aq) + 2NO₃⁻(aq)  → 2K⁺(aq) + 2NO₃⁻(aq) + PbS(s)

Cancel out the spectator ions

S²⁻(aq) + Pb²⁺(aq)   → + PbS(s)

Hence, the balanced net ionic equation is

Pb²⁺(aq) + S²⁻(aq) → PbS(s)

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Taking into account the reaction stoichiometry, 2.778 moles of oxygen are needed to react with 100 grams of aluminum.

In first place, the balanced reaction is:

4 Al + 3 O₂  → 2 Al₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 108 grams of Al react with 3 moles of O₂, 100 grams of Al react with how many moles of O₂?

moles of O₂= (100 grams of Al× 3 moles of O₂)÷ 108 grams of Al

moles of O₂= 2.778 moles

Finally, 2.778 moles of oxygen are needed.

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The maximum number of dots an electron dot diagram can have is 8.

The maximum number of dots drawn on the side of a chemical symbol in an electron dot diagram is 2.

The electron dot diagrams is otherwise known as Lewis electron dot diagrams, Lewis structure, or simple Lewis diagram. It is a diagrammatic representation of the valence electrons of atoms using dots to represent electrons around the symbols of atoms.

The valence electron of an atom is the number of electrons present in the outermost shell of the atom. According to the rules, the first shell of an atom can take a maximum of 2 electrons while the remaining shells can take a maximum of 8 electrons each.

Atoms with 8 electrons in their outermost shells are said to be in an octet state.

The number of dots an atom will have around it will, therefore, depend on the number of valence electrons it has.  As a rule of thumb, each side of an atom can take a maximum of 2 electrons. Thus, an atom with 8 valence electrons will have 2 dots each on its 4 sides.

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Answer:

the first is 8 an the second one is 2

Explanation:

Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the expression to calculate heat exchanges:

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)

Solving:

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J

Specific heat of metal × 5,814 gC= 4,872.504 J

Specific heat of metal = 4,872.504 J÷ 5,814 gC

Specific heat of metal = 0.8381 J/gC

Finally, the specific heat of the metal is 0.8381 J/gC.

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Answer:20 mi/s

Explanation:

We obtain the mass percent of the element T as 96.5%.

We know that the mass percent actually has to do with the mass of the object that we could have in a compound expressed as a percentage. Note that we are told that most of the new elements that were discovered do exist as oxides this implies that they are binary compounds of the element that is involved and oxygen.

Now we have to look at the section of the table that have been given in the question so as to be able to obtain the the mass percent of the element as we have it. We can see as it has been written in the table that the atomic mass of the element T is found to be 362.31.

We would now have;

Molar mass of the compound = 6(362.31) + 5(16)

= 2173.86 + 80

= 2253.86

Mass percent composition of element T =  6(362.31)/2253.86 * 100/1

= 96.5%

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