Harry or Ron? Better personality, who's cuter, other

Answer:

40.5%  is abundance of X-122

Explanation:

we know there are two naturally occurring isotopes of X, X-120  and X-122.

First of all we will set the fraction for both isotopes

X for the isotopes having mass 122

1-x for isotopes having mass 12 0

The average atomic mass of X is 120.81 amu

we will use the following equation,

122x + 120 (1-x) = 120.81

122x + 120 - 120x = 120.81

122x- 120x = 120.81 -120

2x = 0.81

x= 0.81/2

x= 0.405

0.405 × 100 = 40.5%

40.5%  is abundance of X-122 because we solve the fraction x.

now we will calculate the abundance of X-120.

(1-x)

1 - 0.405 = 0.595

0.595  × 100 = 59.5 %

59.5 %  for X-120.

Answer:

V = 5.6 L

Explanation:

Given data:

Number of moles of C₄H₁₀ = 0.25 mol

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Volume of C₄H₁₀ = ?

Solution:

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L /mol.K

1 atm × V = 0.25 mol ×  0.0821 atm.L /mol.K × 273.15 K

V = 5.6 atm.L/ 1 atm

V = 5.6 L

Answer:

mass= 150 g

volume= 550 cm3

density= mass/ volume

= 150/550

= 0.27 g/cm3

Answer:

12 moles of F₂

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

N₂ + 3F₂ —> 2NF₃

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Finally, we shall determine the number of mole of F₂ needed to produce 8 moles of NF₃. This can be obtained as illustrated below:

From the balanced equation above,

3 moles of F₂ reacted to produce 2 moles of NF₃.

Therefore, Xmol of F₂ will react to produce 8 moles of NF₃ i.e

Xmol of F₂ = (3 × 8)/2

Xmol of F₂ = 12 moles

Thus, 12 moles of F₂ is needed for the reaction.

Answer:

When 150.0g of the solution are evaporated, 7.50g of KCl must be collected

Explanation:

A solution 5% of potassium chloride means that there are 5g of KCl per 100g of solution.

When all the solution is evaporated, the solute KCl will be collected as a solid.

In 150g of solution there are:

150g * (5.00gKCl / 100g solution) = 7.50g of KCl are present in 150g of solution.

That means:

Answer:

Gelada baboons plays a significant role.

Explanation:

The role of gelada baboons in their ecosystem is very important because they aerate the soil for plants which is necessary for good plant growth. These gelada baboons also helps in controlling the population of predator in their ecosystem which is very essential for the stability and equilibrium of the ecosystem so gelada baboons has a good effect on both plants and animals in their ecosystem.

Answer: Primary Consumer

Explanation: Gelada Baboons are herbivores, :D

Answer:

7.07

Explanation:

HA = weak acid = 0.053

A+ = conjugate base = 0.045

Ka = 7.2x10^-8

Ka = [H+][A-]/HA

7 2x10^-8 = [H+][0.045]/0.053

[H+] = 7.2x10^-8 x 0.053/0.045

= 8.48x10^-8

PH = -log[H+]

= -log[8.48x10^-8]

PH = -[login.48 + log10^-8]

PH = -0.928 - (-8)log10

= 7.07

Answer: absorbs energy

Explanation:

Answer:

releases energy

Explanation:

Answer:  [tex]\Delta H[/tex] for the reaction is 87935 J

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

[tex]Molarity=\frac{moles}{\text {Volume in L}}[/tex]

[tex]moles of HCl[/tex]=[tex]Molarity\times {\text {Volume in L}}=1.35\times 0.01=0.135moles[/tex]

[tex]moles of NaOH[/tex]= [tex]Molarity\times {\text {Volume in L}}=1.76\times 0.01=0.176moles[/tex]

As 1 mole of HCl neutralizes 1 mole of NaOH

0.135 moles of HCl will neutralize = 0.135 mole of NaOH

Thus HCl is the limiting reagent.

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

Q = Heat absorbed by water = ?

m = mass of water = 200 g    (volume of water=200ml, density of wtaer = 1 g/ml)

c = specific heat capacity = [tex]4.18 J/g^0C[/tex]

Initial temperature of water = = 24.6°C

Final temperature of water=  = 38.8 °C

[tex]Q=200\times 4.18\times (38.8-24.6)[/tex]

[tex]Q=11871.2J[/tex]

Thus heat released by 0.135 moles is = -11871.2 J

heat released by 1 mole is =[tex]\frac{-11871.2 J}{0.135}\times 1=-87935J[/tex]

The heat of reaction, ΔH is 87935 J

Equation of reaction between HCl and NaOH is given below:

Molarity = number of mole/volume

Number of moles = molarity * volume

Number of moles of  HCl = 1.35 M * 0.1 L = 0.135 moles

Moles of NaOH = 1.76 M * 0.1 L = 0.176 moles

1 mole of HCl neutralizes 1 mole of NaOH

Calculating the quantity of heat evolved:

where m is mass, c is specific heat capacity, ΔT is temperature change

Heat absorbed by water, Q = mcΔT

mass of water = density * volume

density of water = 1 g/mL

volume of water = 200 mL

mass of water = 1 g/mL * 200 mL

mass of water = 200 g

specific heat capacity of water, c = 4.18 J/g°C

Initial temperature of water = = 24.6°C

Final temperature of water=  = 38.8 °C

ΔT = 38.8 - 24.6 = 13.7°C

Q = 200 g * 4.18 J/g°C * 14.2°c

Q =  11871.2 J

Therefore, heat released by 0.135 moles is = -11871.2 J

Heat released by 1 mole = 11871.2 * 1/0.135

Heat released by 1 mole = 87935 J

Therefore, the heat of reaction, ΔH is 87935 J

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Answer:

1.16 cubic centimeters

Explanation:

Answer:

Strontium is a soluble earth metal with the nuclear number 38. Phosphate is a polyatomic particle containing phosphorus and oxygen molecules. Strontium loses electrons to turn out to be emphatically charged, and phosphate is an adversely charged particle.

Explanation:

When strontium phosphide comes into contact with water, it transforms into a solid that emits poisonous and combustible fumes. It is a highly reactive substance utilized in the production of chemically reactive devices as well as a laboratory reagent. Strontium phosphide is ionic.

Two elements combine to form an ionic compound. Sr is the metal while P is the non-metal in the ionic combination. After transferring its two valence electrons to P to create the phosphide ion, which has a net negative charge of -3, strontium becomes a cation.

Ions are charged particles that form when an atom (or group of atoms) receives or loses an electron, and ionic compounds are composed of these charged particles.

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Answer:

Ba(NO₃)₂(aq) + Na₂SO₄(aq) ⇒ BaSO₄(s) + 2 NaNO₃(aq)

Explanation:

Let's consider the unbalanced double displacement equation for the reaction of an aqueous solution of barium nitrate and an aqueous solution of sodium sulfate.

Ba(NO₃)₂(aq) + Na₂SO₄(aq) ⇒ BaSO₄(s) + NaNO₃(aq)

To get the balanced equation, we will multiply NaNO₃(aq) by 2.

Ba(NO₃)₂(aq) + Na₂SO₄(aq) ⇒ BaSO₄(s) + 2 NaNO₃(aq)

Answer:

if its a neutral atom there should be 6 electrons because there are 6 protons

Explanation:

Answer:

The answer to your question is given below

Explanation:

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

Mass of cholesterol (in μg) = 203 μg

Mass of cholesterol (in Kg) =?

The following conversion scale can be used to convert micro grams (μg) to kilogram (kg).

1 μg = 1×10¯⁹ Kg

Therefore,

203 μg = 203 μg × 1×10¯⁹ Kg / 1 μg

203 μg = 2.03×10¯⁷ Kg

Thus, 203 μg is equivalent to 2.03×10¯⁷ Kg

Answer:

n-Pentane

Explanation:

All molecules possess dispersion forces. It is possible in non-polar molecules that a temporary distortion in the electron distribution of one molecule can affect the electron distribution in a neighboring molecule. This is known as  induced dipole, induced dipole forces.

However, this  induced dipole, induced dipole forces depends on the shape of the molecule. Molecules of n-pentane are capable of better interaction via  induced dipole, induced dipole forces since the molecules interact over the entire length of the molecule rather than neopentane which is more compact and nearly spherical.

Answer:

d. selenium (Se) I’m a non metal

Explanation:

What we know about the element in view is that it has:

              4 orbitals

              6 valence electrons

The orbitals are the energy levels in the element.

Valence electrons are the outermost shell electrons.

The orbitals tells us the periods in which an element belongs. Since we have 4 orbitals, this suggests that our element belongs to the 4th period.

The number of valence electrons tells us the group in which the element could be found. Since we have 6 valence electrons, the group number is 6.

Therefore, the element is period 4 and group 6 is selenium. Selenium is a non-metal.

Answer:

Explanation:

λ  =  [tex]10^8[/tex]   meters

Explanation:

f : frequency

c :  velocity of light

λ  : wavelength

f  =  c/λ

λ  =  c /f

c  =  2.99  ⋅ [tex]10^8[/tex] m/ s

λ  =  [tex]10^8[/tex] meters

Answer: Moseley's experiments in X-ray spectroscopy showed directly from their physics that cobalt and nickel have the different atomic numbers, 27 and 28, and that they are placed in the Periodic Table correctly by Moseley's objective measurements of their atomic numbers.

Explanation:

The mass of 63 ml sample : 79.38 g

Given

20 ml and 25.2 g of glycerol

Required

The mass of 63 ml sample

Solution

Density is the ratio of mass per unit volume

Density formula:

[tex]\large{\boxed {\bold {\rho~=~ \frac {m} {V}}}}[/tex]

Density of glycerol :

= m : V

= 25.2 g : 20 ml

= 1.26 g/ml

Mass of 63 ml sample :

= density x volume

= 1.26 g/ml x 63 ml

= 79.38 g

Answer:

1s2 2s2 2p6 3s2 3p6

Explanation:

Phosphorus is a non metal. It gains electrons to form ions. The most likely ion formed is the phosphide, where it gains three extra electrons.

Total number of electrons in Phosphide = 15 + 3 =18

The electronic configuration is given as;

1s2 2s2 2p6 3s2 3p6

Electronic Configuration can be defined as the electron distribution of an atom or molecule in an atomic or molecular orbit. The atomic orbit consists of the s, p and d orbitals.

The Atomic number of Phosphorus is 15.

Thus, the Electronic configuration of Phosphorus is 1s² 2s² 2p6 3s² 3p³.

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Answer:

Anwser A

Explanation:

Sand dunes are created by wind deposition.

The accumulation of sand that produce the sand dunes is called wind deposition. Therefore, option (A) is correct.

Sand dunes are formed when wind deposits the sand on top of each other. It stays until a small mound starts to form. As the first mound forms, sand builds up on the windward side more and more until the edge of the dune breaks due to its own weight.

When the angle of the dune becomes too big to support the weight,  the collapse of sand dune begins. This is called the angle of repose usually around 30°-34° also depends upon wind speed, grain size, and roundedness of the individual grains.

As these dunes collapse, the sand starts to move in the same direction as the wind. The sand piles up on multiple sides of the dune by changing wind direction and is unable to get the angle of repose such dune never collapses.

Therefore, the sand dunes produce the accumulation of sand through a process called wind deposition.

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Answer:

.133

Explanation:

Dissolution of solute lowers the vapor pressure of solvent .

Relative lowering by non -volatile solute is equal to mole fraction of solute dissolved .

Vapor pressure of pure water is 2.33 k Pa

Lowering of vapor pressure = 2.33 - 2.02 = .31 k Pa .

relative lowering = .31 / 2.33 = .133

relative lowering will be equal to mole fraction of non volatile solute like NaCl

so mole fraction of NaCl dissolved = .133

Answer:

C 1,868 years

Explanation:

I just took the test - I tried doing the math and was close but couldn't get it exact; so I guessed and I was correct :)

Answer:

1,868 years

Explanation:

Answer:

C. 43 kJ

Explanation:

Bond energy (bond enthalpy (H) or bond strength) is the amount of energy required to break a bond. The bond energy is used to determine the strength of a chemical bond.

The bond energy is the difference between the energy of the reactants and the energy of the products. The bond energy is given by:

[tex]\Delta H=\Sigma Bond\ energy\ reactants-\Sigma Bond\ energy\ products\\\\Where \ \Delta H=bond\ energy\ or\ energy\ released\\\\Given\ that\ \Delta H=25\ kJ,\Sigma Bond\ energy\ reactants=68\ kJ, Hence:\\\\\Delta H=\Sigma Bond\ energy\ reactants-\Sigma Bond\ energy\ products\\\\Substituting:\\\\25\ kJ=68\ kJ- \Sigma Bond\ energy\ products\\\\ \Sigma Bond\ energy\ products=68\ kJ-25\ kJ\\\\ \Sigma Bond\ energy\ products=43\ kJ\\[/tex]

Answer: is simply C.

Answer:

×

Explanation:

FALSE BECAUSE NOT OCEAN IT IS ALL

Answer:

There will be an increased span of the melting point of acetanilide

Explanation:

if benzoic acid and acetanilide are mixed in equal amounts, there will be an increased span of the melting point of acetanilide than what is known already. This is because the two compounds have mixed together to become a mixture.

Answer: Either [tex]C_5H_6O[/tex]  or [tex]C_{10}H_{12}O_2[/tex]

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.  

The empirical formula is [tex]C_5H_6O[/tex]

Now we have to calculate the molecular formula:

[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}[/tex]

n is a whole number

The molecular formula could be=[tex]1\times C_5H_6O=C_5H_6O[/tex]

Thus molecular formula could be = [tex]2\times C_5H_6O=C_{10}H_{12}O_2[/tex]