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zhuklara [117]
3 years ago
10

Thermal energy always moves from a greater energy level to a lesser energy level

Chemistry
1 answer:
Nookie1986 [14]3 years ago
6 0

Answer:

\fbox{Law -Based \: on \: laws \: of \: thermodynamic}

Explanation:

At constant pressure Thermal energy always moves from a greater energy level to a lesser energy level, laws of thermodynamics prove that.

Nature always likes to attain equilibrium either it's movement of heat energy or flow of water from higher region to lower region. The first and second law of thermodynamics are profe of that, the first law says that the total energy of universe is Constant. Energy can not be destroyed it always changes from one form to another, by work and heat. The second law explains why thermal energy moves from a greater energy level to a lesser energy level, it deals with the change in entropy of a system and surrounding and states heat flows from hot environment to cold environment.

<em><u>Thanks for joining brainly community!</u></em>

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An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. what are its atomic number, atomic mass, and net charge?
Murrr4er [49]

Answer:

Z=26, A = 56, charge +3.

Explanation:

The atomic number is represented by Z. Is equal to the total number of protons that the atom has.  Z=26.

The atomic mass is represented by A. The number results from the total sum of protons and neutrons of an atom.  Both particles have a weight of 1 uma, are in the nucleus and give the mass to the atom.

Mass number (A) = atomic number (Z) + number of neutrons (N)

                        A = 26 + 30

                        A = 56

The net charge of the atom can be calculated by subtracting the negative charges from the positive ones. The positive charges come from the protons and the negative ones from the electrons.

26-23=3

This iron ion has a positive charge +3.

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Why are car crashes more dangerous at higher speeds than at lower speeds
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The impact of speed and velocity at greater speeds affects the car much greater than at slower speeds due to impact and timing and velocity and speed.
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If 12.85 g of chromium metal is reacted with 10.72 g of phosphoric acid, then what is the maximum mass in grams of chromium(III)
RUDIKE [14]
<h3>Answer:</h3>

16.02 g

<h3>Explanation:</h3>

<u>We are given;</u>

  • Mass of chromium as 12.85 g
  • Mass of phosphoric acid as 10.72 g

We are require to calculate the maximum mass of chromium (III) phosphate that can be produced.

  • The equation for the reaction is;

2Cr(s) + 2H₃PO₄(aq) → 2CrPO₄(s) + 3H₂(g)

<h3>Step 1: Determining the number of moles of Chromium and phosphoric acid</h3>

Moles = Mass ÷ Molar mass

Molar mass of chromium = 52.0 g/mol

Moles of Chromium = 12.85 g ÷ 52.0 g/mol

                                 = 0.247 moles

Molar mass of phosphoric acid = 97.994 g/mol

Moles of phosphoric acid = 10.72 g ÷ 97.994 g/mol

                                          = 0.109 moles

<h3>Step 2: Determine the rate limiting reactant </h3>
  • From the equation, 2 moles of chromium reacts with 2 moles of phosphoric acid.
  • Therefore, 0.247 moles of Chromium will require 0.247 moles of phosphoric acid, but we only have 0.109 moles.
  • This means chromium is in excess and phosphoric acid is the rate limiting reagent.
<h3>Step 3: Moles of Chromium(III) phosphate</h3>
  • From the equation, 2 moles of phosphoric acid reacts to yield 2 moles of chromium (III) phosphate.
  • Therefore, Moles of Chromium (III) phosphate = Moles of phosphoric acid

Hence; moles of CrPO₄ = 0.109 moles

<h3>Step 4: Maximum mass of  CrPO₄ that can be produced</h3>

We know that, mass = Moles × Molar mass

Molar mass of  CrPO₄ = 146.97 g/mol

Thus,

Mass of  CrPO₄ = 0.109 moles × 146.97 g/mol

                         = 16.02 g

Thus, the maximum mass of CrPO₄ that can be produced is 16.02 g

7 0
4 years ago
Can someone actually help me with this?
Tpy6a [65]

Answer:

p = 43, n = 57, e = 40

Explanation:

Z is the number of protons. The number of neutrons, subtract Z from the isotope number (100). To begin with, protons and electrons are equal in an atom, but this atom lost three, so subtract 3 from Z.

Z= # of protons = 43

100 - 43 = 57 neutrons

43 - 3 = 40 electrons.

8 0
4 years ago
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