1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kaheart [24]
3 years ago
6

Balancing chemical reactions is consistent with which scientific law?

Chemistry
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

Balancing chemical reactions is consistent with Lavoisier's law of conservation of mass.

Explanation:

When a chemical reaction happens, involves the exchange of electrons between the different elements inside the compounds that participate in the reaction.

But the elements themselves (that form the compounds) are not affected , so the elements that are after the reaction should be the same ones that before it happens.

Therefore the total mass of an element (sum of the mass of all the atoms of an element that appears before the reaction) should be the same as the total mass of the element after the reaction. And this should be true for each element.

Lets take this example of a balanced chemical reaction

N_{2}+ 3H_{2} -> 2NH_{3}

the number of N atoms at the beggining is 2 ( 2 N atoms attached to themselves) and after the reaction are 2 N also ( each one bonded to an ammonia molecule)

The same should happen with H : 3 gas molecules x 2 atoms of H per gas molecule (H2) = 6 and after the reaction 2 ammonia molecules x 3 atoms of H per ammounia molecule = 6

The equation is balanced only when all the elements are balanced

Note: Strictly speaking, the sum of energy and mass is conserved. But the correction is so insignificant for chemical reactions that in the majority of cases is not taken into account.

You might be interested in
A solution contains 3.1 mM Zn(NO3)2 and 4.2 mM Ca(NO3)2. The p-function for Zn2+ is _____, and the p-function for NO3- is _____.
seropon [69]

<u>Answer:</u> The p-function of Zn^{2+} and NO_3^{-} ions are 2.51 and 2.14 respectively.

<u>Explanation:</u>

p-function is defined as the negative logarithm of any concentration.

We are given:

Millimolar concentration of zinc nitrate = 3.1 mM

Millimolar concentration of calcium nitrate = 4.2 mM

Converting this into molar concentration, we use the conversion factor:

1 M = 1000 mM

  • Concentration of zinc nitrate = 0.0031 M = 0.0031 mol/L

1 mole of zinc nitrate produces 1 mole of zinc ions and 2 moles of nitrate ions

Concentration of zinc ions = 0.0031 M

Concentration of nitrate ions in zinc nitrate, M_1=(2\times 0.0031)=0.0062M

  • Concentration of calcium nitrate = 0.0042 M = 0.0042 mol/L

1 mole of calcium nitrate produces 1 mole of calcium ions and 2 moles of nitrate ions

Concentration of calcium ions = 0.0042 M

Concentration of nitrate ions in calcium nitrate, M_2=(2\times 0.0042)=0.0084M

To calculate the concentration of nitrate ions in the solution, we use the equation:

M=\frac{M_1V_1+M_2V_2}{V_1+V_2}

Putting values in above equation, we get:

M=\frac{(0.0062\times 1)+(0.0084\times 1)}{1+1}\\\\M=0.0073M

Calculating the p-function of zinc ions and nitrate ions in the solution:

  • <u>For zinc ions:</u>

\text{p-function of }Zn^{2+}\text{ ions}=-\log[Zn^{2+}]

\text{p-function of }Zn^{2+}\text{ ions}=-\log(0.0031)\\\\\text{p-function of }Zn^{2+}\text{ ions}=2.51

  • <u>For nitrate ions:</u>

\text{p-function of }NO_3^{-}\text{ ions}=-\log[NO_3^{-}]

\text{p-function of }NO_3^{-}\text{ ions}=-\log(0.0073)\\\\\text{p-function of }NO_3^{-}\text{ ions}=2.14

Hence, the p-function of Zn^{2+} and NO_3^{-} ions are 2.51 and 2.14 respectively.

5 0
3 years ago
What is meant by Critical temperatue?
yuradex [85]

Answer:

The critical temperature of a substance is the temperature at and above which vapour of the substance cannot be liquefied, no matter how much pressure is applied.

4 0
3 years ago
What causes pressure inside a helium balloon?
kupik [55]

Explanation:

So the gas pressure of a helium balloon arises from the impact of the collisions of the helium atoms between themselves and with the inside surface of the balloon. Of course, the outside atmosphere similarly exerts a pressure on the outside of the balloon.

7 0
3 years ago
Among timber, wind, and oil, which is a fossil fuel and which is not?
Cloud [144]

Answer:

Oil is a fossil fuel and timber or wood and wind is not. Hope this helps!

5 0
2 years ago
Read 2 more answers
Which TWO statements describe the ocean floor giving brainliest pls help explain ur answer
Gelneren [198K]

Answer:

Dude im not 100% sure but I think its b and c im sorry if im wrong its just that im not really sure which ones are.

Explanation:

8 0
3 years ago
Other questions:
  • Circle the letter of each sentence that is true about ideal gases and real gases.
    15·1 answer
  • Why are both accuracy and precision important in making a measurement
    11·1 answer
  • And atom that has fewer neutrons and protons and more electrons than protons is a what ion
    13·1 answer
  • Why does the pH of the acid solution initially increase very slowly when metal is first added to the acid solution, but graduall
    10·1 answer
  • What is the total number of distinct 13C NMR signals that may be observed for the product, methyl-3-nitrobenzoate, and for the r
    13·1 answer
  • I WILL MARK Brainest
    11·1 answer
  • The only type of movement particles in a solid do is
    10·1 answer
  • 3 What is the number located in the top right hand corner of the atomic symbol of an ion with 16 protons, 17 neutrons and 14 ele
    15·1 answer
  • How long is a grain of rice? Select the best estimate.
    11·1 answer
  • In 1-2 sentences explain how the shorelines can affect weather.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!