Which phase changes will result in an increase in energy of the substance

Answers

Answer 1
Answer:

Answer:

when gas condenses to liquid the quantity of energy converts.

Explanation:

two phase changes where the heat in energy is released

Answer 2
Answer: potential energy. During a phase change, the heat added (PE increases) or released (PE decreases) will allow the molecules to move apart or come together. Heat absorbed causes the molecules to move farther apart by overcoming the intermolecular forces of

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When NaOH is added to water, the (OH) = 0.04 M. What is the [H30*]?What is the PH of the solution?

Answers

Answer:

[H₃O⁺] = 2.5 × 10⁻¹³ M

pH = 12.6

Explanation:

Step 1: Given data

Concentration of OH⁻: 0.04 M

Step 2: Calculate the concentration of H₃O⁺

Let's consider the self-ionization of water reaction.

2 H₂O(l) ⇄ OH⁻(aq) + H₃O⁺(aq)

The ionic product of water is:

Kw = [OH⁻] × [H₃O⁺] = 10⁻¹⁴

[H₃O⁺] = 10⁻¹⁴ / [OH⁻]

[H₃O⁺] = 10⁻¹⁴ / 0.04

[H₃O⁺] = 2.5 × 10⁻¹³ M

Step 3: Calculate the pH

The pH is:

pH = -log [H₃O⁺] = -log 2.5 × 10⁻¹³ = 12.6

What is the total number of atoms contained in 2.11 moles of nickel?

Answers

  The  total  number of atoms  contained  in 2.11  moles  of nickel is
1.27 x10^24 atoms

            calculation

By  use of Avogadro  law constant

 
That is   1 mole= 6.02 x10^23  atoms
what  about  2.11  moles of nickel

  by  use of cross  multiplication
[ 2.11  moles  x ( 6.02 x10^23)] / 1 moles = 1.27 x10^24 atoms

1.27 × 10²⁴ atoms of nickel are contained in 2.11 moles of nickel. For every mole of a substance there are 6.022 × 10²³ representative particles of that substance. The amount of particles in one mole of substance is called Avogadro's number.

Further Explanation

To convert from the number of moles to number of representative particles, the formula below may be used:

\boxed {no. \ of \ particles \ = given \ no. \ of \ moles * (6.022 * 10^(23) \ particles)/(1 \ mole)}

For this problem, the number of nickel atoms can be determined by plugging in the given values in the equation above:

no. \ of \ Ni \ atoms = 2.11 \ mol \ Ni * (6.022 * 10^(23) Ni \ atoms)/(1 \ mol \ Ni)\n\n\boxed {no. \ of \ Ni \ atoms = 1.270642 * 10^(24) \ atoms}

Since the given only has three significant figures, the final answer with the correct number of significant figures is:

\boxed {\boxed {no. \ of \ Ni \ atoms = 1.27 * 10^(24) \ atoms}}

Learn More

  1. Learn more about representative particles brainly.com/question/8969313
  2. Learn more about Avogadro's number brainly.com/question/229300
  3. Learn more about mole conversions brainly.com/question/1370888

Keywords: moles conversion, Avogadro's number

How much energy in joules does it take to raise the temperature of 255g of water by 12.5C

Answers

Energy in a system can be calculated by multiplying the given mass to thespecific heat capacity of the substance and the temperature difference. It isexpressed as follows:

Energy = mC(T2-T1)
Energy = 255(4.184)(12.5)
Energy = 13336.5 J

Answer: The amount of energy required to raise the temperature is 13323.75 joules.

Explanation :

The amount of energy required to raise the temperature can be calculated as follows.

                   q = m* C* \bigtriangleup T

where,

        q = heat energy

        m = mass of water

         C = specific heat

          T = temperature

Remember that the specific heat of water is 4.18\left ( (J)/(g^\circ C)} \right ).

Therefore, putting the values in the above equation as follows.

        q = m* C* \bigtriangleup T

           = 255 g * 4.18 \left ( (J)/(^\circ C)} \right )* 12.5^oC

         = 13323.75 joules

So, the amount of energy required to raise the temperature is 13323.75 joules.


When an electron moves up to higher energy levels, the atom Choose... a photon of light whereas the atom Choose... a photon of light when an electron drops to a lower energy level. The photons emitted from an atom appear as

Answers

Answer:

Explanation:

When an electron moves from a lower energy level to a higher energy level, energy is absorbed by the atom. When an electron moves from a higher to a lower energy level, energy is released and photon is emitted.

this emitted photon is depicted as a small wave-packet being expelled by the atom in a well-defined direction.

Chem help due in 2 hours. please help. problem 14.

Answers

14 )

a) 1 HBr + 1 NaHCO = 1 CO + 1 HO + 1 NaBr

b) 
2 HNO + 1 K₂SO₃ = 1 HO + 2 KNO + 1 SO

c) 2 HI + 1 Na₂S = 1 H₂S + 2 NaI

d) 1 
(NH)SO + 1 Ca(OH) = 1 CaSO + 2 HO + 2 NH

1. At room temperature, air is usually a (solid, liquid, gas).​

Answers

At room temperature the air is Gas