Earth's outer core is
moved by plate tectonics.
Above the crust and mantle
below the crust and mantle.
made of solid iron.

Answer:

Oxygen gains two electrons to have an octet. The ionic bond between ions results from the electrostatic attraction of opposite charges. The final formula of magnesium oxide is MgO.

Explanation:

Answer:

The energy of one photon is given by the expression, E=hν

where, h=6.626×10

−34

Js and ν=5×10

14

s

−1

E=6.626×10

−34

×5×10

14

=3.313×10

−19

J

Explanation:

The type of object that creates the most friction is a rough object.

This is the force that opposes the motion of an object. It usually exist between two surfaces that are in contact.

Factors affecting frictional force include the following;

The frictional force between two bodies depends mainly on the following factors:

(I) forces acting on the objects

(ii) type of the surface in contact

(iii) position or inclination of the surfaces

How to reduce frictional force between two surfaces;

Thus, the type of object that creates the most friction is a rough object.

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The temperature of the can reduces and it turns into ice and the thermal energy is exchanged between the walls.

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The correct answer is 48.36 g .

A mole of any material is equal to 6.023 x 1023, or Avogadro's number. Additionally, it is employed to express concentrations in terms of moles per litre or molecular weight.

Number of moles of O = (Mass of O / Molar mass of O) = ( 25.7 g / 15.999 g/mol) = 1.6 mol

3 mol of O combine with 2 mol of Fe (iron) to form Fe​​​​​2​​​O3 . Or, 1 mol of O combines with (2/3) mol of Fe.

Therefore, 1.6 mol of O combine with = (2/3) × 1.3 =  0.866 mol of Fe

Mass of Fe (iron) = (Number of moles of Fe) × (Molar mass of Fe) = (0.866 mol) × (55.845 g/mol) = 48.36 g

Hence, the amount of iron required = 48.36 g

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Answer:

after burning the coal,0.8of coal was lost to produce Ash and it remained little amount of coal

Considering the image, sample A bears the lowest value of Temperature change,

This is further explained below.

Generally, When there is a rise or decrease in temperature as a result of the transfer of heat, this is referred to as a temperature change.

This causes a change in the chemical equilibria toward the products or the reactants, which may be identified by examining the reaction and determining whether or not it is endothermic or exothermic.

In conclusion, Taking into consideration the picture, sample A has the lowest value of temperature change; this indicates that it will take the most time to cool down or change the temperature while it is being cooled down.

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The Independent variable  in the experiment is the type of covering material.

An experiment is the only way by which we are able to decode cause and effect relationships. Since science is empirical, every tentative explanation if a phenomenon is subjected to controlled tests. These controlled tests are what we call an experiment. There must be an independent variable and there must be  dependent variable. The independent variable is the variable that is manipulated in the experiment while the dependent variable is the variable that changes as we manipulate the independendent variable.

Now, if we look at the experiment, we can see that we are manipulating the type of covering in order to determine the impact that it has on the time that it taking for cooling to occur.

Hence the Independent variable  in the experiment is the type of covering material. The type of the covering was being changed and then the impact of the change of the covering material on the cooling time is studied.

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Alteration in Temperature, Color Change Noticable Odor, Developing a Precipitate and The emergence of bubbles are the factors  indicates that the gases are chemically reacting.

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Common brass is a copper and zinc alloy.

it contains  37.0% zinc by mass and having a

density of 8.48 g/cm³. A fitting composed of

common brass has a total volume of 121.5 cm³

as per avove staement , we have got

mass of copper = 63%

density = 8.48 g/cm³

volume =121.5 cm³

now,

Mass of Fitting = Vol * Density = 8.48 * 121.5= 1030 gm.

Mass of copper = 63% of 958.24 = 603.7 gm.

Moles of copper = mass/Mol. wt. = 603.7/63.5 ; [Mol wt. of copper = 63.5]

= 9.507 moles.

Therefore, Atoms of Copper = Moles * NA  = 9.507*6.022*10^23

                                         = 5.725*10^24 atoms.

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Answer:

Solid and lipid element

Octane is a hydrocarbon and an alkane with the chemical method C8H18, and the condensed structural system CH3CH26CH3. Octane has many structural isomers that fluctuate by using the quantity and vicinity of branching inside the carbon chain. any such isomers, 2,2,four-trimethylpentane usually called iso-octane is used as one among the standard values in the octane score scale.

Octane is colloquially used as a quick form of octane score specifically in the expression high octane. Octane score is an index of a gasoline's ability to withstand engine knock-in engines having exclusive compression ratios, which is a feature of octane's branched-chain isomers, especially iso-octane. The octane rating of gas is not directly related to the strength output of an engine. using gasoline of a better octane than an engine is designed for can't boom electricity output.

Nonane can have a better boiling factor than octane because it has an extended carbon chain than octane. Octane can have a higher boiling point than 2,2, three,three‑tetramethyl butane, because it branches much less than 2,2,3,3‑tetramethyl butane, and consequently has a larger floor vicinity and extra van der Waals forces. Nonane could have a better boiling factor than octane because it has an extended carbon chain than octane.

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A block has a side length of 2.0 cm x 5.6 cm x 11.4 cm

he block has a density of 8.5 g/cm³.

block's mass = ?

from above statement we have got volume = 2.0 * 5.6 * 11.4

                                                                       = 127.68cm³

density = 8.5 g/cm³.

now density = mass / volume

mass = density * volume

mass = 1,085.28 g

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the correct option is c = 12 electrons.

There are fours quantum numbers

1) Principal Quantum Number (n)

2) Azimuthal Quantum Number (L)

3) Magnetic Quantum Number (ml)

using the above information ,

4) If n= 1

L = N-1

L = 1-1 =0

'0' represent the S orbital.

each orbital can hold hold only two electrons.

The number of orbital is = 1S

4) If n= 2

L = n-1

L = 2-1

L = 1

m = -L , 0 , +L

M = +1 , 0 , -1

The number of orbitals is = 1s , 2s and 2p (Only two orbitals.)

each orbital can have only two electrons , S orbital contains two electrons and 2p (2px, 2py,2pz)= 6 electrons.

5) If n=3

L= n-1

L = 3-1= 2

L = 0,1,2

number of orbitals = S, P,D

m = -2,-,1,0,1,2

The number of orbitals are = 1S ,2S,2p, 3p ,4d

3p contains the electrons = 6 electrons.

So the number of electrons contains in p orbital from n=1 to n= 3 is 0+6+6= 12 electrons.

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Answer:

125

Explanation:

the positive 2 on the exponent means you have to move the decimal point 2 times to the right, giving you 125.

you can also simplify the expression to 1.25 * 100 and get 125

16.254 × [tex]10^{23}[/tex] molecules

The formula for sulfur dioxide is [tex]SO_2[/tex].

MOLECULES of sulfur dioxide are present in 2.70 moles of this compound

so, we have given the moles of [tex]SO_2[/tex] = 2.70 moles

we have find the number of molecules = ?

1 mole of Na = 6.022×[tex]10^{23}[/tex] molecules

so 2.70 moles of SO2 contains = 2.70[tex]\times[/tex] 6.022×[tex]10^{23}[/tex] molecules

moles of SO2 contains = 16.254 × [tex]10^{23}[/tex] molecules

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Answer:

a pebbles density is 34 meters and has a volume of 2

The mass of the CO2 28.4 Kg.

The term combustion refers to burning. When a material is combusted, the material is made to burn in oxygen. This in itself is an oxidation reaction. It is common that we have to burn the alkanes and some other kinds of hydrocarbons for the process of obtaining energy.

In this case, we can see that the substance that we have to  burn is pentane. The reaction equation is written in the manner; C5H12+8O2→6H2O+5CO2.

Number of moles of pentane = 9.28 * 10^3 g/ 72 g/mol

= 128.9 moles

Now;

If 1 mole of pentane produces 5 mols of CO2

128.9 moles of pentane would produce 128.9 moles *  5 mols/ 1 mole

= 644.5 moles of CO2

Mass of CO2 produced = 644.5 moles of CO2 * 44 g/mol = 28.4 Kg

Hence, we have about 28.4 Kg of CO2 produced

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By using oxidation number method , the balance chemical equation is given by :

2Al     +      3H₂SO₄     ------>     Al₂(SO₄)₃     +      3H₂

the give equation is :

Al     +      H₂SO₄     ------>     Al₂(SO₄)₃     +      H₂

1) write the oxidation number of each atom

           reactant           product

Al           0                          +2

H            +1                          0

S            +6                         +6

0             -2                         -2  

2) Identify the atom which is oxidized and reduced and balance the for these.

Al is oxidized, from 0 to +3 and hydrogen is reduced from +1 to 0.now to balance Al and H, multiply 2 on the right side

2Al   +    H₂SO₄   ------>    Al₂(SO₄)₃     +     H₂

3) calculate the total increase in oxidation number in oxidation and same for reduction.

2Al⁰   to  2Al⁺³   ( so total increase is +6)

2H⁺¹ to     2H⁰  (   decrease in -2 )

4) now, make total increase in oxidation number =  total decrease in oxidation number .for this multiply 3 to hydrogen both side to get decrease of -6.

2Al     +      3H₂SO₄     ------>     Al₂(SO₄)₃     +      3H₂

There fore, the balance chemical equation by oxidation number method is given as :

2Al     +      3H₂SO₄     ------>     Al₂(SO₄)₃     +      3H₂

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1-chemical equation.

2-an arrow.

3-only the atoms present in the reactants can end up in the products.

The initial compound(s)—the reactants—and the final compound(s)—the products—are separated by an arrow in a chemical equation. The overall charge and the number of atoms in each element are equal on both sides of a balanced chemical equation.

Step 1: Set Up a Table. Subscripts and coefficients are both present in chemical equations.

Step 2: Determining and Balancing the First Element. Pick an element that appears in one molecule on the left side and in one molecule on the left.

Step 3: Balancing Hydrogen.

Step 4: Balancing Oxygen..

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The wavelength of the light is obtained as 122nm.

From the Bohr model of the atom, we know that an electron could absorb energy and move from a lower to a higher energy level. When this electron returns to its ground state, energy is emitted in the form of a photon of visible light.

Given that;

1/λ = RH (1/n1^2 - 1/n2^2)

λ = wavelength of the light

n1 = final level

n2 = initial level

1/λ = 1.097 * 10^7(1/1^2 - 1/2^2)

1/λ =  1.097 * 10^7(1 - 0.25)

λ = 1.22 * 10^-7 m or 122nm

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Answer:

1 Gram of sodium azide produces 2.25 grams of nitrogen, so you would need about 13.7777777778 grams of sodium azide to produce 31 grams of nitrogen

Explanation:

The brass is neither an element nor a compound but it can be a mixture.

Brass is an alloy of copper and zinc. It can be used achieve mechanical, electrical and chemical properties.

We can say that from the definition the brass is neither element nor the compound but it can be a mixture. Brass is a homogenous mixture of the metals Copper and zinc. The common percentage of the brass is 65% of cooper and 35% of zinc.

Brass is used for preventing the corrosion and also used for providing low friction. The brass is commonly used in locks, zippers, plumbing, electrical plugs and in sockets. The used of the brass is not widely range but it is commonly used for the decorating purposes.

So we can conclude that the brass is neither an element nor a compound but it can be a mixture.

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The number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183mol.

The number of moles in a solution can be calculated by multiplying the molarity of the solution by the volume as follows:

no of moles = molarity × volume

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution. It is the most common way to express the concentration of a solution.

According to this question, there are 150 mL of a 0.122 M pottasium bromide (KBr) solution, the number of moles in this solution can be calculated as follows;

no of moles = 150mL/1000 × 0.122M

no of moles = 0.0183mol

Therefore, the number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183moles.

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The general rule of sig figs is that if there's a number with less sig figs than another, you should use the amount of sig figs in that number.

For example, if you have the numbers 1 and 7.86 and add them together, 1 only has one sig fig and 7.86 has three. Therefore, you'd add 8.86 and then round up so you have one sig fig as your answer (9).

So now, applying what we know:

[tex]2.5+9.520\\= 12.020\\=12[/tex]

You can see that we rounded down to 12 because there need to be only two sig figs here. If we wrote our answer as 12.0, this would be three sig figs since the 0 after the decimal counts.

Final answer: 2 sig figs

I hope this helps!