help asap please !! i need help filling in the blanks. it’s about balancing equations :))

Answer:

48 mph

Explanation:

divide time by distance - 20/25 = .8 miles per minute, multiple by 60 to get mph

Answer:

The astenosphere is located below the lithosphere

The mantle is composed of silicate material

Explanation:

The Earth has several different layers, and they can be presented in two different manners, depending on their chemical composition and their physical properties. According to the chemical composition the Earth has three layers, crust, mantle, and core, while in accordance to the physical properties it has five, lithosphere, astenosphere, mesosphere, outer core, and inner core.

The astenosphere is the second layer from the top, and it lies just below the lithosphere. It is also the upper part of the mantle. The mantle is a layer that is largely composed of silicate material, mostly silicate molten rock. It can easily be seen from the volcanic activities that this layer is composed of silicate material because the magma is rich in it, and the magma comes from this layer.

Answer:

a because it has a 2 and 3 in ot like it says in the question

Answer:

80L

Explanation:

V1/T1 = V2/T2

V2 = V1 T2/T1

T1 = 300K

V1 = 60L

T2 = 400K

V2 = ?

V2 = V1 T2/T1

V2 = (60L)(400K) / (300K)

V2 = 80L

Answer:

See Explanation

Explanation:

Let us closely consider the electronic configuration of manganese atom, Manganese II ion and manganese III ion. This will give a clue of the answer.

Manganese: [Ar] 3d5 4s2

Manganese II: [Ar] 3d5

Manganese III: [Ar] 3d4

Now, let us remember that the d orbital contains a maximum of ten electrons. Hence, the electronic configuration of Mn^2+, [Ar] 3d5 reflects a half filled d- orbital which is known to be unusually stable(half-filled orbitals are known to possess unusual stability just as fully filled orbitals do).

The same can not be said about Mn^3+. Hence, Mn^2+ is more stable than Mn^3+.

Balanced chemical reaction: 2KClO₃ → 2KCl + 3O₂.

Potassium is metal from first group of Periodic table of elements, it has always oxidation number in compound +1.

Chlorine in the reactant state has oxidation number +5 (+1 + x + 3 · (-2) = 0) and it is reduced to -1 (+1 + x = 0) in the product state.

Oxygen in the reactant state has oxidation number -2 (+1 + 5 + 3 · x = 0) and it is oxidized to 0 (in molecule of oxygen) in the product state.

Consider this reaction and answer the questions:

             Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.

What is the oxidation number of chlorine in the reactant state?

+5

What is the oxidation number of oxygen in the reactant state?

-2

What is the oxidation number of potassium in the reactant state?  

+1

What is the oxidation number of chlorine in the product state?

What is the oxidation number of oxygen in the product state?

What is the oxidation number of potassium in the product state?

Answer:

"3. Energy can either be destroyed or created. Its goes from one form to another."  

Explanation:

The third answer choice, "3. Energy can either be destroyed or created. Its goes from one form to another. " is related to the Law of Conservation of Energy from thermodynamics. Is it not a postulate of the Kinetic Molecular Theory.

"1. Average Kinetic Energy of the system is a measure of the temperature of the system."

Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]

"2. Energy is conserved in the collisions between gas molecules.."

Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]

"3. Energy can either be destroyed or created. Its goes from one form to another.

[tex]\times[/tex] NOT a Postulate of Kinetic Molecular Theory

"4. Gases travel in straight line until they collide with other gas molecules"

Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]

Answer:

Probably around 6 because the ph of hydrochloric acid is 3

Explanation:

Answer:

4.9 L O₂

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

Identify variables

[Given] 6.4 g O₂ at STP

[Solve] L O₂

Step 2: Identify Conversions

[STP] 1 mol = 22.4 L

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of O₂: 2(16.00) = 32.00 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

4.48 L O₂ ≈ 4.9 L O₂

Answer: The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.

Answer:

Lava flows are streams of molten rock that pour or ooze from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. ... But when basalt lava flows are confined within a channel or lava tube on a steep slope, the main body of the flow can reach velocities >30 km/h (19 mph).

Explanation:

Answer:

okkkkk

Explanation:

the balanced equation is

2NaBr +Cl2 =2NaCl + Br2

can you mark me as a brainliest

Answer:

See Explanation

Explanation:

From Gay-Lussac's law of combining volumes;

Equation of the reaction; 2H2(g)  + O2(g) -------> 2H2O(g)

Ratio of volumes;              2           :    1                :    2

Initial volumes;                  500cm^3   500cm^3       0 cm^3

Reacting volumes;          500cm^3    250cm^3      500cm^3

Final Volumes;                0 cm^3        250 cm^3     500 cm^3

We can easily see from the table that the limiting reactant is oxygen.

Hence, the mass of water formed is obtained from;

1 mole of gaseous water occupies 22400 cm^3

x moles of water occupies 500cm^3

x = 500cm^3 * 1 mole/22400 cm^3

x = 0.022 moles of water

Mass of water = 0.022 moles of water * 18 g/mol

Mass of water = 0.396 g

Answer: 39.948 grams

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Argon, or 39.948 grams

Answer:

O titanium, Ti

Explanation:

Answer:

A

Explanation:

because

O2 : H2O

11 : 8

hope this helps:)

The mole to mole ratio of oxygen to water for the chemical equation given is 11:8.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Learn more about mole,here:

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Answer:increase In kinetic energy of molecules

Explanation:increase in kinetic energy of molecules

When there is an increase in temperature of a gas in an enclosed container, the pressure will also increase due to the increase in the kinetic energy.

Temperature and pressure of gas is directly proportional to each other.

When the temperature of the gas increases, then the kinetic energy of the gas molecules are also increases. Due to increase in the velocity of gas molecules they will collide with each other as a result of which pressure of the gas is aslo increases.

Hence due to increase in kinetic energy, pressure increases.

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Answer:

Limiting Reagent = Aluminum

Mass formed = 28.92g (4.s.f.)

Explanation:

Step 1: Write a balanced equation for the reaction

We know that Aluminum hydride is formed from hydrogen and aluminum, so we can put those elements in our equation first:

H2 + Al -> AlH3

*Remember that hydrogen is a diatomic molecule so it is H2.

Now let's balance it! We can see that the Al molecules are balanced but the Hydrogens are not, so we can multiply both molecules by the opposite number:

3H2 + Al -> 2AlH3

Now we have 6 hydrogens on each side, we just add a 2 to balance the aluminum and we have the balanced equation!

3H2 + 2Al -> 2AlH3

Step 2: Convert all values to no. of moles

To do this, we can use the formula:

mass = no. moles x Molar mass

Which we can rearrange to find No. moles = mass/ Molar mass

Hydrogen: 3.00/2.02 = 1.49 moles

Aluminum: 26.00/26.98 = 0.9637 moles

Step 3: Find the Limiting Reagent

Now we choose one (let's use hydrogen) and divide by the co-efficient ratio between the two elements (3H2 for every 2 Al).

1.49 x 2/3 = 0.993 (This is the theoretical amount of Aluminum we need for the amount of hydrogen we have)

Now we compare this number with the actual no. moles of aluminum we have to find the limiting reagent:

0.993 > 0.9637

This means that Aluminum is the limiting reagent. (We are working with 0.9637 moles of Aluminum.)

Step 4: Find amount of product formed

We can use the molar ratio of the balanced equation again to find how much AlH3 is made. The coefficient of Al is the same as the coefficient of AlH3. This means that equal no. if moles are made in the reaction.

This means that 0.9637 moles of Aluminum Hydride is formed in this reaction.

Step 5: Convert back to mass in grams

Now we just need to convert the no. moles back to mass using the same formula:

mass = no. moles x Molar Mass

m = 0.9637 x (26.98 + 3 x 1.01)

m = 0.9637 x 30.01

m = 28.92g (4.s.f.)

Hope this helped!

Answer:

2,981g

Explanation:

Firstly, we need to find the number of moles of MgCl that we have by using the formula: mass = No. Moles x Molar Mass, which we can rearrange so that we are solving for no. moles:

No. Moles = mass / Molar Mass

We are given a mass of 621g, and we can calculate the molar mass of MgCl by adding the two molar masses together: 24.31+35.45 = 59.76

Now we can calculate number of moles by substituting these values into the formula:

n = 621 / 59.76

No. moles = 10.4

Now we can use the co-efficients in the formula to tell us how many moles of AgCl will be formed. The coefficient of MgCl is 1, and the coefficient of AgCl is 2. This means that every 1 mol of MgCl will form 2 moles of AgCl. So, to find the no. moles of AgCl, we multiply our no. moles by 2:

10.4 x 2 = 20.8 moles

Finally we convert this back into mass by multiplying the no. moles by the Molar mass of AgCl:

m = 20.8 x (107.87+35.45)

m = 2,981g

Explanation:

One atom of carbon (2.4) combines with two atoms of oxygen (2.6) to form the compound carbon dioxide CO2 (only the outer shell of carbon's electrons are shown). ... The carbon dioxide molecule is held together by the strong C=O. carbon–oxygen double covalent bonds by sharing electrons.

Explanation:

Your chemical equation should look like this:

Li3PO4 + AlF3 --> 3LiF + AlPO4

This is the balanced equation for a double-displacement reaction

Answer:

cell :—

•They lack a well-defined nucleus, have a nucleoid instead.

•Usually have double-stranded, circular DNA.

•Do not have mitochondria.

Eukaryotic cell :—

•Have a well-defined nucleus enclosed in the nuclear membrane.

•Have a linear double-stranded nucleus.

•Mitochondria are present.

Explanation:

[tex]XCl _{2(aq)} + 2AgNO _{3(aq)}→X(NO _{3}) _{2(aq)} +2 AgCl _{(s)}[/tex]

Answer:

[tex]XCl2(aq) + 2AgNO3(aq) --------> X(NO3)2(aq) + 2AgCl(s)[/tex]

Explanation:

The rule guiding he balancing of reaction equations is that the number of atoms of each element on both sides of the reaction equation must be the same.

In order to balance this equation, this rule must be applied. The balanced reaction equation therefore becomes;

XCl2(aq) + 2AgNO3(aq) --------> X(NO3)2(aq) + 2AgCl(s)

We can see by conducting an atom count that the number of atoms of each element on both sides of reaction equation is the same hence the equation is balanced.

D melting ice cream because if u know what a physical change is its a change that you can reverse chimical change are changes you cant reverse so u can freeze back ice cream so :D

Answer:

12.6 g

Explanation:

Step 1: Write the balanced decomposition reaction

2 Fe₂O₃ ⇒ 4 Fe + 3 O₂

Step 2: Calculate the moles corresponding to 18.0 g of Fe₂O₃

The molar mass of Fe₂O₃ is 159.69 g/mol.

18.0 g × 1 mol/159.69 g = 0.113 mol

Step 3: Calculate the moles of Fe formed from 0.113 moles of Fe₂O₃

The molar ratio of Fe₂O₃ to Fe is 2:4. The moles of Fe formed are 4/2 × 0.113 mol = 0.226 mol

Step 4: Calculate the mass corresponding to 0.226 moles of Fe

The molar mass of Fe is 55.85 g/mol.

0.226 mol × 55.85 g/mol = 12.6 g

Answer:

the required temperature of uranium hexafluoride is 54156.25 K

Explanation:

Given the data in the question;

We know that average speed is;

u = [tex][ 3RT / MM ]^{1/2[/tex] ----------- let this be equation 1

where MM is the molar mass

T is temperature

R is universal gas constant and u is the average speed.

First we get the average speed of H₂

[tex]U_{H}[/tex]₂ =  [tex][ 3RT_H_2 / MM_H_2 ]^{1/2[/tex] ------ let this be equation 2

Next is the average speed of UF₆

[tex]U_{UF[/tex]₆ = [tex][ 3RT_{UF_6} / MM_{UF_6} ]^{1/2[/tex] ------ let this be equation 3

given that; both have the same average speed, equation 2 = equation 3;

[tex][ 3RT_H_2 / MM_H_2 ]^{1/2[/tex] = [tex][ 3RT_{UF_6} / MM_{UF_6} ]^{1/2[/tex]

we multiply both sides by 1/3R and also square both sides.

[tex][ T_H_2 / MM_H_2 ][/tex] = [tex][ T_{UF_6} / MM_{UF_6} ][/tex]

given that; temperature of hydrogen T[tex]_{H[/tex]₂ = 37°C = ( 37 + 273.15)K = 310.15 K

we know that Molar mass of H₂; MM[tex]_{H[/tex]₂ = 2.016 g/mol  

and molar mass of  UF₆; MM[tex]_{UF[/tex]₆ = 352.02 g/mol

so we substitute

[ 310.15 K / 2.016 g/mol  ] = [ T[tex]_{UF[/tex]₆ / 352.02 g/mol ]

T[tex]_{UF[/tex]₆ = [ 352.02 g/mol  × 310.15 K ] / 2.016 g/mol

T[tex]_{UF[/tex]₆ = 109179.003 K/ 2.016

T[tex]_{UF[/tex]₆ = 54156.25 K

Therefore, the required temperature of uranium hexafluoride is 54156.25 K