How many moles of ammonia would be required to react exactly with
0.230 moles of copper(II) oxide in the following chemical reaction?
2 NH3(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

Answer:

I would say Physical Evidence.

Explanation:

I am not so sure, so you can look up trace evidence versus physical evidence, and decide what barefoot footprints would fall into.

The correct match is as follows:

Pressure and heat - Metamorphic rock

Cooling magma - The Intrusive igneous rock

Cooling lava - The Extrusive igneous rock

Erosion and Deposition - Sedimentary rock

This is because Metamorphic rocks are formed as a result of past existing rocks changing form. If the igneous and sedimentary rocks are exposed to high temperature and pressure, they then become metamorphic rocks.

Intrusive igneous rocks form when magma cools slowly. This process soon results in the formation of large-crystal like structures. Whereas, when exposed to the atmosphere lava cools rather quickly. This faster cooling process forms extrusive igneous rocks. The fast cooling lava creates smaller crystals and a smoother surface.

The sediments that are formed as a result of weathered rocks are usually deposited on the surface of Earth, or at the bottom of rivers and oceans. Over time, sediments collect and form layers over the most recent layer. This leads to the formation of sedimentary rocks.

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Answer:

I believe this is your answer, or wait I know this is your answer

Explanation:

According to the first law of thermodynamics, the total energy of a system, including its surrounds, is conserved if heat is acknowledged as a kind of energy.

The study of thermodynamics looks at the connections between heat, work, temperature, and energy. The movement of energy from one place or form to another is the main focus of thermodynamics. The underlying concept is that heat is a form of energy that may be compared to a certain amount of mechanical work.

The heat was not formally recognized as a form of energy until around 1798, when British military engineer Count Rumford (Sir Benjamin Thompson) discovered that endless amounts of heat could be produced while boring cannon barrels and that the amount of heat produced is proportional to the work done while turning a blunt boring tool. Rumford's finding of the relationship between heat produced and work completed served as the theoretical cornerstone for thermodynamics.

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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:

31 N

Explanation:

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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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!

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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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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For different order Kinetics the lineer graph is different plots.

For Zero order reaction, the integrated rabe law is

[A] = [A]₀-Kt            K =rate constant

[A] vs t graph is straight line with slope = -k

For first order reaction, the integrated rate law is

In [A] = In [A]o - Kt

In [A] vs t graph is straight line with slope = -K

For second order reaction, the integrated rate law is

1/[A]= 1/  [A]o + Kt

1/[A] vs t graph is straight  line with slope = +k

So, for all cases the slope of straight line is either +k or -K.

k'is rate constant only depends on temperature not on concentration of reactant.

So the slope will not change for Trial II with 0.2m Naoh.

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Answer:

1600 microliters

Explanation:

µl =mL ÷ 0.0010000 so 1.60÷0.00010000=1600

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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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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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making up an answer:

I hypothesize that water will evaporate quicker under an incubator than on the counter.

The experiment; Equal amounts of water in the same type of containers, one under an incubator, and one on a counter with even temperature.

The volume of object is 0.99 L

 Here, the given mass of the object is 30.30g

Given density of the object is 30.32g/L

Density = Mass / volume

⇒ volume = mass/density

                  =30.30g / 30.32g/L

                  =0.99 L

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A disruption or vibration in matter, whether solid, gas, liquid, or plasma, is what generates mechanical waves.

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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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Scientists assume that the law of universal gravitation is true on all of the planets in the Solar System because The planets are always moving perpendicular to the Sun's gravitational attraction, which causes them to follow an elliptical route around it.

Where, F is gravitational force between two bodies.

m₁ and m₂ are masses of the bodies.

r is the separation between the two bodies' centres.

G is universal gravitational constant = 6.673 x 10⁻¹¹Nm²/kg².

Thus law of universal gravitation is true on all planets.

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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:

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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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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Answer:

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

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:

Answer:

Solid and lipid element

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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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