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


Answer 1


when gas condenses to liquid the quantity of energy converts.


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

Related Questions

(II) To make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is cooled (usually in dry ice) before it is placed in the hole. A steel rivet 1.872cm in diameter is to be placed in a hole 1.870cm in diameter in a metal at 22°C. To what temperature must the rivet be cooled if it is to fit in the hole
When palmitoleic acid reacts with hydrogen to form a saturated fatty acid, indicate the stoichiometry of the reaction and the product that is formed. If the stoichiometry of H2 or the product is not integral, enter a fraction (i.e. 3/2)
Draw the structure that corresponds with the name: 3,5-dimethoxybenzaldehyde
Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?Average atomic mass of Z = [mass]
A pharmacist wishes to strengthen a mixture from 10%alcohol to 30% alcohol. How much pure alcohol should be added to 7 liters of the 10% mixture?

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



[H₃O⁺] = 2.5 × 10⁻¹³ M

pH = 12.6


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?


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


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


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


        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




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.


14 )

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

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).​


At room temperature the air is Gas