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kap26 [50]
3 years ago
5

Does adding coefficients to a chemical equation disobey the law of definite proportions? Explain your answer.

Chemistry
1 answer:
Temka [501]3 years ago
3 0

Answer:   No

Explanation:

- Law of definite proportions is a case from the Law of conservation of energy (matter) which states that "mass can neither be created nor destroyed, but changed from one form to another."

-  Adding coefficients to a chemical equation confirms that there is the same number of atoms on both sides of a reaction; therefore, matter has not been created or destroyed but reorganized to give new substrates.

Example :             2 Mg + O2 → 2 MgO              

In the balanced equation above, 2 moles of Mg reacts with 1 mole of O2 to produce 2 moles of MgO.

mass of 2 moles of Mg  = 24×2= 48 grams

mass of 1 mole of O2 = 16+16 = 32 grams

total mass of reactants = 48 + 32 = 80 grams


mass of 2 moles of MgO = (24+16) ×2 = 80 grams  

total mass of products = 80 grams

It is clear that the number of grams of matter before and after the reaction is the same and  equals to 80 grams, so obeys the law of definite proportions..


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Describe the uses of the following safety equipment. Fire extinguisher-
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Answer:

To Put of a Fire.

Explanation:

incase an emergency happens, it's important to have a fir extingushier so the situation doesn't get worse and you can put out any possible fire's.

6 0
3 years ago
1. Consider the following equilibrium system: C(s) + CO2(g) 2CO(g)
ser-zykov [4K]

Answer:

a) equilibrium shifts towards the right

b) equilibrium shifts towards the right

c) equilibrium shifts towards the left

d) has no effect on equilibrium position

e) has no effect on equilibrium position

Explanation:

A reversible reaction may attain equilibrium in a closed system. A chemical system is said to be in a state of dynamic equilibrium when the rate of forward reaction is equal to the rate of reaction.

According to Le Chateliers principle, when a constraint such as a change in temperature, pressure, volume or concentration is imposed upon a system in equilibrium, the equilibrium position shifts in such a way as to annul the constraint.

When the concentration of reactants is increased, the equilibrium position is shifted towards the right hand side and more products are formed. For an endothermic reaction, the reverse reaction is favoured by a decrease in temperature. Increase in pressure has no effect on the system since there are equal volumes on both sides of the reaction equation. Similarly, the addition of a catalyst has no effect on the equilibrium position since it speeds up both the forward and reverse reactions to the same extent.

3 0
2 years ago
Chlorine gas reacts with aluminum metal producing aluminum chloride. What mass of chlorine reacts with 9.00g of Al to form AlCl3
Anit [1.1K]
The  mass of  chlorine   that react  with  9.00 g  of Al to form AlCl3  is   35.465  grams

     Explanation
write  the equation  for  reaction
that is
2 Al +  3 Cl2  = 2 Al CL3
find  the moles  of    Al  reacted

moles = mass/molar mass

  9 g/ 27  g/mol = 0.333  moles  of Al

by use  of mole ratio between   Al to  Cl2    which is  2:3   find the moles of  Cl2

mole  of cl2 =  0.333 x3/2 = 0.4995  moles


mass of  Cl2  is therefore =  moles  x  molar mass

= 0.4995  x71 =  35.465  moles




6 0
3 years ago
In the example above, imagine that the sunlight, solar cell, and fan form a closed system and no heat is generated. In this situ
Sergio [31]

1000 kilojoules of electrical energy gets transformed into 1000 kilojoules of kinetic energy.


7 0
3 years ago
Read 2 more answers
Describe the main difference between the Bohr model of the atom and the Rutherford model.
atroni [7]

Answer:

The main difference between the two models was about the location of the electron in an atom.

Explanation:

<u>Rutherford described that:</u>

  • The electrons were outside of the nucleus.
  • They were equal in number to the "positiveness" of the nucleus.
  • Also, He randomly placed the negative electrons outside the nucleus.

<u>Bohr improved the Rutherford model:</u>

  • Bohr placed the electrons in distinct energy levels.
  • Electrons only exist in fixed orbitals (shells) and not anywhere in between.
  • Each shell has a fixed energy
  • Rutherford explained the nucleus of an atom, while Bohr was more into the electrons and their energy levels.

8 0
2 years ago
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