Why does earth’s rotation axis lean toward the sun for only one-half of its orbit?

1. The metamorphic rocks are produced when the parent or the pre-existing rocks (whether sedimentary, igneous, or even metamorphic) are changed by pressure, heat, and the chemical activity of the fluids.  

When the prime changing factor is heat, generally due to direct contact, it may go through fundamental modification in recrystallization and texture is known as contact metamorphism. While regional metamorphism takes place when the minerals and texture of the rock are modified by pressure and heat.  

Metamorphic rocks form when heat and pressure transform existing rocks through contact or regional metamorphism. The volcanoes northwest of the Big Island of Hawaii are no longer erupting because they have moved away from the hotspot. To locate an earthquake's epicenter, data from a minimum of three seismic stations is required.

1). Metamorphic rocks are formed when existing rocks are transformed by heat and pressure. This process can occur through two main types of metamorphism: contact metamorphism and regional metamorphism.

2). Volcanoes on Hawaiian Islands:

The volcanoes on the Hawaiian islands northwest of the Big Island of Hawaii are no longer erupting because they have moved away from the hotspot in the Earth's mantle that supplies magma. As the Pacific Plate moves northwestward, the older volcanoes are carried away from the hotspot, becoming dormant.

3). Boiling Water:

When explaining how a pot of water boils, three terms are essential: radiation, conduction, and convection.

4). Finding Earthquake Epicenter:

A minimum of three seismic stations is needed to find the epicenter of an earthquake due to the process called triangulation. Each station records the time it takes for seismic waves to reach them, and by plotting circles with the quake's arrival time at each station, the intersection point of the three circles pinpoints the epicenter.

Your answer should be metamorphic rock.

I think the answer is B. Metamorphic rock.

Answer: A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.

Explanation:Carbon has atomic no 6 and has 4 valence electrons. It can only share electrons as it is difficult to gain or lose 4 electrons to complete it's octet.

[tex]C:1s^22s^22p^2[/tex]

Chlorine has atomic no 17 and has 7 valence electrons and need one electron to complete its octet.

[tex]Cl:1s^22s^22p^63s^23p^5[/tex]

Thus carbon will share 4 electrons, one each with four chlorine atoms to form carbon tetra chloride.

Covalent bond is formed by sharing of electrons between atoms.

Ionic bond is formed by transfer of electrons between atoms.

Answer:

A) Nonmetal carbon shares valence electrons with each nonmetal chlorine forming four covalent bonds.

Explanation:

I Just answered it :p

Answer : The correct option is, The pH decreases.

Explanation :

As we know that,

pH : It is defined as the negative logarithm of hydrogen ion concentration.

Mathematically it is represented as :

[tex]pH=-\log [H^+][/tex]

According to the question, when the concentration of hydrogen ion increases then the value of pH decreases and the acidity of the solution also increases that means the solution is more acidic in nature.

Hence, if the hydrogen ion concentration increases, the pH decreases.

Answer:

The pH decreases

Explanation:

Hello,

pH is mathematically defined via:

[tex]pH=-log([H^{+} ])[/tex]

Since at the beginning, the concentration of hydride ion is 1e-2M, the pH is:

[tex]pH=-log(1x10^{-2} )=2.0[/tex]

If it is increased, lets suppose to 1.1e-2, the new pH turns out into:

[tex]pH=-log(1.1x10^{-2} )=1.96[/tex]

So the pH decreases, which means that the acidity increases as well.

Best regards.

To solve the question, there is a need to use the equation:

PV = nRT

(894.6/760) × 1.18 = n × 0.0821 × (273 + 44.1)

By solving we get:

Total moles, n = 0.053

Assume, the moles of argon as a and of hydrogen as b,

So,

40 × a + 2 × b = 1.25 --------- (i)

a + b = 0.053 ------- (ii)

By solving i and ii we get:

a = 0.03,

Thus, mole fraction of Ar = XAr = 0.03/0.053 = 0.57

So,

Partial pressure of Ar = 894.6 × XAr = 894.6 × 0.57 = 509.92 mm Hg

The amount of HCl in a solution can be calculated by multiplying the solution's volume by its molarity. In the context of gastric acid with a molarity of 3.03x10^-2 M, there are approximately 3.3x10^-4 moles of HCl in 10.9 mL of the solution.

The concentration of a solution is typically expressed in moles per liter (M), which denotes the amount of substance (in moles) present in one liter of the solution. When dealing with hydrochloric acid (HCl) in the context of gastric acid, a solution's molarity can be used to calculate the amount of HCl in a specific volume of the solution.

Given that the concentration of HCl in the gastric acid is 3.03x10^-2 M, there are 3.03x10^-2 moles of HCl in one liter of the solution. We are interested in finding out how many moles of HCl are present in 10.9 mL (or 0.0109 L) of the solution. This can be done by multiplying the volume of the solution by its molarity:

Moles of HCl = Volume in L x Molarity

Moles of HCl = 0.0109 L x 3.03x10^-2 M

So, the quantity of HCl in 10.9 mL of gastric acid is approximately 3.3x10^-4 moles.

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The number of moles of HCl in 10.9 mL of stomach acid that is 3.03x10^-2 M can be calculated using the concentration and volume. The result is 3.32x10^-4 moles of HCl.

The stomach acid is primarily composed of HCl and has a pH range of 1 to 4. To determine the number of moles of HCl in 10.9 mL of stomach acid that is 3.03x10^-2 M in HCl, we can use the formula:

Moles of solute (HCl) = concentration (M) x volume (L)

Converting the volume of stomach acid from mL to L (10.9 mL = 0.0109 L) and substituting the given values into the formula:

Moles of HCl = 3.03x10^-2 M x 0.0109 L = 3.32x10^-4 moles

Therefore, there are 3.32x10^-4 moles of HCl in 10.9 mL of the stomach acid.

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Answer: Sulphur and Oxygen

Explanation: Sulphate ion is [tex]SO_4^{2-}[/tex]. It is polyatomic ion which is formed by the combination of sulphur and oxygen elements in the ratio of 1:4.

It is negatively charged species and thus is named by the name _ate at the end.

It usually exists with positively charged species to get stable. eg: ferrous sulphate ([tex]FeSO_4[/tex])

The correct answer is B. hypothesis is falsifiable, but theory has been proven to be correct. A falsifiable thing is something that can be proved as false, also the hypothesis is an explanation that is suggested after an observation process. On the other hand, a theory is a more reliable source because it is verified, checked and proved after certain events that have evidence to certify.

Answer:

115.2 °C since melting point is an intensive property  

Step-by-step explanation:

The melting point of a substance does not depend on how much you have.

For example, the melting point of water is 0 °C, whether it is an ice cube from the refrigerator or in the frozen pond outside.

The freezing point of a substance is an intensive property.

Thus, the melting point of 100 g of sulfur is 115.2 °C because melting point in an intensive property.

The reason the mass did not change because he did not add anything to the mixture accept the two liquids and its not possble to change the mass/ weight of any certain weighted item like the which is heavier the 1 pound of feathers or the 1 pound of bricks the only things is that the brick has more density so there for neither one is heavier than the other because the are both a pound

Final answer:

The mass did not change because mass is a conserved quantity.

Explanation:

The mass did not change because mass is a conserved quantity. In other words, mass cannot be created or destroyed during a chemical reaction. When Jay mixed the two liquids and a yellow solid formed, the total mass of the system remained the same.

When the two liquids were mixed, a chemical reaction occurred, resulting in the formation of a new substance (the yellow solid). However, the total mass of the reactant liquids and the product solid remained constant. This is known as the law of conservation of mass.

The correct answer is option 4, that is, a fewer number of particles of the sample will dissolve in 1 minute.  

This is mainly because usually the solubility and the rate of solubility of the salts in water enhances with the increase in temperature, that is, the more the temperature, the faster and higher will be the number of particles that the water can dissolve. Therefore, at 70 degree Celsius more particles will get dissolved in water in 1 minute than at 20 degree Celsius.  

Answer: its (4) a fewer number of particles of the sample will dissolve in 1 minute

Explanation:

got it right on my test

Answer:

C) The half life of carbon-14 is about 5700 years and is too short to date rocks.  

Step-by-step explanation:

The practical limit for carbon dating is about nine half-lives (50 000 yr).

At that point, the amount of carbon remaining has dropped to about 0.2 % of the original amount.

The experimental uncertainties involved become so large that carbon dating is no longer reliable.

Most rocks hundreds of millions or even billions of years old.

Any radioactive carbon would have long since decayed to unmeasurable levels.

A) is wrong. Many rocks contain carbon, but they are so old that the amount of radioactive carbon has dropped below measurables.

B) is wrong. The half-life of carbon is too short to use for dating rocks.

D) is wrong. About 20 % of the carbon in rocks comes from living things that were embedded in layers of mud.

===============

Uranium-238 and lead-206 have half-lives of 4.5 × 10⁹ yr, which is about the age of the Earth.

Even the oldest rocks would still have half of their radioactivity, and younger rocks would have more.

Thus, U-238 and Pb-206 are ideal isotopes for measuring the ages of rocks.

You can distinguish between a Ca(NO3)2 solution and a Zn(NO3)2 solution by performing a precipitation reaction test. Adding NaOH to the solutions will result in the formation of a white precipitate in the Zn(NO3)2 solution, but not in the Ca(NO3)2 solution.

You can tell a Ca(NO3)2 solution from a Zn(NO3)2 solution by performing a chemical reaction test called a precipitation reaction. When a solution of NaOH is added to a Zn(NO3)2 solution, a white precipitate of Zn(OH)2 is formed. However, when NaOH is added to a Ca(NO3)2 solution, no precipitation occurs.

This is because Zn(OH)2 is insoluble in water and forms a white solid precipitate, while Ca(NO3)2 does not form a precipitate with NaOH as calcium hydroxide is soluble in water.

Therefore, by observing the formation or absence of a white precipitate when adding NaOH to the respective solutions, you can distinguish between a Ca(NO3)2 solution and a Zn(NO3)2 solution.

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To distinguish between a [tex]Ca(NO\(_3\))\(_2\)[/tex] solution and a [tex]Zn(NO\(_3\))\(_2\)[/tex]solution, one can perform a series of qualitative tests and observations.

Here are some methods:

 1. Flame Test:

Add a few drops of the unknown solution to a flame using a clean platinum or nichrome wire. Calcium ions[tex](Ca\(^{2+}\) )[/tex] in [tex]Ca(NO\(_3\))\(_2\)[/tex]will impart an orange-red color to the flame, while zinc ions [tex](Zn\(^{2+}\))[/tex] in [tex]Zn(NO\(_3\))\(_2\)[/tex]will not produce a characteristic flame color.

2. Precipitation Reactions:

a. Add a few drops of ammonia solution to the unknown solution. Zinc ions will form a white precipitate of zinc hydroxide,[tex]Zn(OH)\(_2\)[/tex], which will dissolve in excess ammonia to form a clear solution due to the formation of tetraamminezinc(II) complex, [tex][Zn(NH\(_3\))\(_4\)]\(^{2+}\).[/tex]Calcium ions will not form such a complex and will remain as a precipitate of calcium hydroxide, [tex]Ca(OH)\(_2\).[/tex]

 b. Add sodium sulfate solution to the unknown solution. Calcium ions will react with sulfate ions to form a white precipitate of calcium sulfate, [tex]CaSO\(_4\)[/tex], which is insoluble in water. Zinc sulfate, [tex]ZnSO\(_4\)[/tex], is soluble in water, so no precipitate will form in the presence of zinc ions.

 3. Conductivity Test:

Both solutions will conduct electricity due to the presence of ions. However, the conductivity of the solutions will not help in distinguishing between the two since both have similar numbers of ions when dissolved in water.

 4. Solubility Test:

Both[tex]Ca(NO\(_3\))\(_2\)[/tex]and [tex]Zn(NO\(_3\))\(_2\)[/tex] are generally soluble in water, so this test may not be conclusive. However, if a precipitate forms upon dissolving the salt in water, it could indicate the presence of calcium, as some calcium salts have limited solubility in water.

5. Complexometric Titration:

Using a chelating agent like EDTA (ethylenediaminetetraacetic acid) in a complexometric titration can differentiate between the two. Zinc ions will react with EDTA to form a stable complex, while calcium ions will not react as readily under the same conditions. This can be indicated by a suitable metal ion indicator such as Eriochrome Black T for calcium or xylenol orange for zinc.

 By performing these tests, one can determine whether the solution contains calcium nitrate or zinc nitrate based on the observations made during each reaction.

Answer:  

4.3 g

Explanation:  

We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.  

M_r:               60.05      32.00

                 CH₃CH₂OH + 3O₂ ⟶ 2CO₂ + 3H₂O

Mass/g:                             7.0  

1. Calculate the moles of O₂

Moles O₂ = 7.0 × 1/32.00  

Moles O₂ = 0.219 mol O₂  

=====  

2. Calculate the moles of CH₃CH₂OH

The molar ratio is 1 mol CH₃CH₂OH:3 mol O₂  

Moles of CH₃CH₂OH = 0.219 × 1/3  

Moles of CH₃CH₂OH = 0.0729 mol CH₃CH₂OH

======  

3. Calculate the mass of CH₃CH₂OH  

Mass of CH₃CH₂OH = 0.0729 × 60.05

Mass of CH₃CH₂OH = 4.4 g

 the molar  mass of the element  is  81.36 g/mol

calculation

step 1 : multiply  each %abundance  of the isotope  by   its mass  number

that is 79.95 x 29.9 =2391

           81.95 x 70.1  = 5745

Step 2: add them together

2390.5 + 5744.7 =8136

Step 3: divide by 100

= 8136/100 = 81.36  g/mol

In a chemical equation, the arrow  

A. can be read as "yields" or "makes."  

B. always points toward the products.  

C. separates the products and reactants.  

D. all of these

all of these options are right.

Answer:  the answer is all of these

Explanation:

Answer: [tex]Cu(NO_3)_2[/tex] solution has blue color and [tex]Ni(NO_3)_2[/tex] solution has bright green color.

Explanation:

[tex]Cu(NO_3)_2(aq)\rightarrow Cu^{2+}(aq)(blue)+ NO_{3}^{1-}(aq)[/tex]

[tex]Cu(NO_3)2[/tex] in its aqueous solution gives blue color solution. Copper being transition metal and gives characteristic color in their in aqueous solution.

[tex]Ni(NO_3)_2(aq)\rightarrow Ni^{2+}(aq)(green)+ NO_{3}^{1-}(aq)[/tex]

[tex]Ni(NO_3)2[/tex] in its aqueous solution gives bright green color solution. Nickel is also a transition metal and gives characteristic color in their in aqueous solution.

Cu(NO3)2 solution shows a deep blue color due to the Cu²⁺ ions it contains, whereas Ni(NO3)2 solution generally appears greenish due to the Ni²⁺ ions. You can distinguish these solutions by their colors.

You can distinguish between a Cu(NO3)2 (copper(II) nitrate) solution and a Ni(NO3)2 (nickel(II) nitrate) solution by color. Specifically, Cu(NO3)2 solutions are typically characterized by a deep blue color due to the Cu²⁺ ions it contains.

On the other hand, Ni(NO3)2 solutions generally appear greenish, owed to the characteristic color of Ni²⁺ ions. Figures 19.40 and 18.36 show this difference -- while the copper nitrate solution shows a deep blue color, a nickel nitrate solution would appear more greenish.

Thus, by observing the color of the solutions, it is possible to distinguish between them based on the characteristic color patterns of their constituent ions.

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Answer:

0.640 Torr; 1.28 Torr  

Step-by-step explanation:

According to Raoult's Law,

(1) p₁ = χ₁p₁°,  

where p₁ is the solvent

χ₁ + χ₂ = 1                        Subtract χ₁ from each side

      χ₂ = 1 – k₁                          Substitute in (1)

(2)    p₁ = (1 – χ₂)p₁°    Remove parentheses

       p₁ = p₁°- χ₂p₁°      Subtract p₁° from each side

p₁ - p₁° = -χ₂p₁°              Multiply each side by -1

     Δp =   χ₂p₁°

Δp is the vapour pressure lowering.

If the solute is an electrolyte, we must insert the van't Hoff i factor.

ΔP = iχ₂P₁°

===============

(1) Calculate χ₂ for each solution

Water:

1000 g = 1000 × 1/18.02

          = 55.49 mol

      χ₂ = 2.10/(2.10 + 55.49)

          = 2.10/57.59

          = 0.036 46

===============

(2) Calculate the vapour pressure lowering

(a) Sucrose

   i = 1

ΔP = 1 × 0.036 46 × 17.54

ΔP = 0.640 Torr

=====

(b) NaCl

   i = 2

ΔP = 2 × 0.640

ΔP = 1.28 torr

Answer is: a. it is determined from known oxidation state of an element within a compound determined.

Oxidation state (oxidation number) shows the degree of oxidation of an atom in a chemical compound.

For example, chlorate ion (ClO₃⁻) has negative charge.

One oxygen atom in this anion (negatively charged ion) has the oxidation number -2. There are three oxygen atoms in chlorate anion.

x + 3 · (-2) = -1.

x = -1 + 6.

x = +5; the oxidation number of chlorine.

The oxidation state of Cl (chlorine) in chlorate ion is +5.

Answer:

A. R represents chemical energy; P represents thermal energy.

Step-by-step explanation:

The molecules in the gas contain chemical energy (R).

When the gas burns, the chemical energy is released as heat, or thermal energy (P).

Answer:

A. R represents chemical energy; P represents thermal energy.

Explanation:

The  change  in pressure in a sealed 10.0L vessel  is 5.28 atm

calculation

The pressure is calculated using the ideal gas equation

That is   P=n RT

where;

P (pressure)= ?

v( volume) = 10.0 L

n( number of moles)  which is calculated as below

write the equation  for  decomposition  of   NH₄NO₂

NH₄NO₂  →  N₂  +2H₂O

Find the moles of NH₄NO₂

 moles = molarity x volume in liters

= 2.40 l x 0.900 M =2.16 moles

Use the mole ratio to determine the  moles of N₂

that is from equation above  NH₄NO₂:N₂ is 1:1 therefore the moles of N₂ is also =2.16 moles

R(gas constant) =0.0821 l.atm/mol.K

T(temperature)  = 25° c  into kelvin = 25 +273 =298 K

make p the  subject of the formula  by diving both side  by  V

P = nRT/V

p ={ (2.16 moles x 0.0821 L.atm/mol.K  x 298 K) /10.0 L} = 5.28  atm.

Answer : The pressure of the gas will be, 5.285 atm

Solution : Given,

Volume of [tex]N_2[/tex] gas = 10 L

Temperature of gas = [tex]25^oC=273+25=298K[/tex]   [tex](0^oC=273K)[/tex]

Volume of [tex]NH_4NO_2[/tex] = 2.40 L

Molarity of the ammonium nitrate solution = 0.9 M

First we have to calculate the moles of ammonium nitrate.

[tex]\text{ Moles of }NH_4NO_2=\text{ Molarity of }NH_4NO_2\times \text{ Volume of }NH_4NO_2[/tex]

[tex]\text{ Moles of }NH_4NO_2=(0.9mole/L)\times (2.40L)=2.16moles[/tex]

The balanced chemical reaction is,

[tex]NH_4NO_2\rightarrow N_2+2H_2O[/tex]

From the balanced reaction, we conclude that

1 mole of [tex]NH_4NO_2[/tex] decomposes to give 1 mole of [tex]N_2[/tex] gas

2.16 moles of [tex]NH_4NO_2[/tex] decomposes to give 2.16 moles of [tex]N_2[/tex] gas

Now we have to calculate the pressure of the gas.

using ideal gas equation,

[tex]PV=nRT[/tex]

where,

P = pressure of the gas

V = volume of the gas

T= temperature of the gas

n = number of moles of gas

R = gas constant = 0.0821 Latm/moleK

Now put all the given values in ideal gas equation, we get pressure of the gas.

[tex]P=\frac{nRT}{V}=\frac{(2.16mole)\times (0.0821Latm/moleK)\times (298K)}{10L}=5.285atm[/tex]

Therefore, the pressure of the gas will be, 5.285 atm

In the late 1800's, experiments using cathode ray tubes led to the discovery of the;

Electron(s)

It was founded that many different metals release cathode rays, and that cathode rays were made of electrons, very small negatively charged particles.

equation Fe3O4=Fe+CO2 is an impossible reaction

Answer:

b. Extraction with a solution of sodium hydrogen carbonate, separating the layers, followed by drying and evaporating the organic layer.

Step-by-step explanation:

The ether solution contains your product, benzaldehyde, and some starting material, benzoic acid, the purification steps are:

a. is wrong. Extraction with HCl will not remove much of the benzoic acid.

c. is wrong. If you evaporate the organic layer, you will have a mixture of benzaldehyde and benzoic acid.

d. is wrong. If you work with the aqueous layer, you will end up with benzoic acid,

Given the equation N=O/P, solve for P by multiplying the left and right by P/N:

N * P/N = O/P * P/N

P = O/N

eqn N=O/P

solve for P

P=O/N

The answer is; It is salt because it is formed by the reaction of an acid and a base.

Salt is composed of cations and anions (with a net charge of 0) joined together by ionic bonds attributed to their complementary charges. NaOH is an alkali salt because it forms an alkaline solution when dissolved in water – because it dissociates hydroxide ions.  

Answer:

the answer is B for short

Explanation:

:)

Hey there!:

1 mole O2 ----------------- 22.4 L  ( at STP )

( moles O2 ) -------------- 2.50 L

moles O2  = 2.50 * 1 / 22.4

moles O2 = 2.50 / 22.4

moles O2 =  1.12*10⁻¹

Answer B

Hope that helps!

1.12 x 10^–1 mol O2 moles of oxygen gas (O2) are in a 2.50 L container at standard temperature and pressure. Therefore, option B is correct.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.

The mole concept can be used to convert between mass and number of particles.

1 mole O2 = 22.4 L  (at STP)

(moles O2) = 2.50 L

moles O2  = 2.50 × 1 / 22.4

moles O2 = 2.50 / 22.4

moles O2 =  1.12 × 10⁻¹

Thus, 1.12 x 10^–1 mol O2 moles of oxygen gas (O2) are in a 2.50 L container at standard temperature and pressure, option B is correct.

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Hey there!:

Mass = 5.75 g

Volume = 7.5 cm³

Therefore:

Density = mass / volume

D = 5.75 / 7.5

D = 0.7 g/cm³

Answer C

Hope that helps!

B rises sharply on the right

The pattern which serves as a characteristic of a graph of exponential growth is that it B rises sharply on the right .

Exponential growth serves as a consistent growth rate that brings about rapid increase in growth as total growth numbers increase.

It do takes place when there is an instantaneous rate of change of a quantity with respect to time.

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