Conserved in Chem Rxn

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A Raab 1K
Posts: 56
Joined: Sat Aug 24, 2019 12:16 am

Conserved in Chem Rxn

Postby A Raab 1K » Tue Oct 08, 2019 3:47 pm

Which of the following are conserved in a chemical reaction? Select all that apply.
a. mass
b. number of atoms
c. number of molecules
d. number of electrons
e. number of protons

I think a and b are conserved, but I'm not sure if d and e are also conserved. Can anyone confirm?

Isha_Maniyar_Dis2E
Posts: 110
Joined: Thu Jul 11, 2019 12:16 am

Re: Conserved in Chem Rxn

Postby Isha_Maniyar_Dis2E » Tue Oct 08, 2019 4:16 pm

Yes, electrons and protons are conserved. Protons are not transferred between atoms, and even when electrons are transferred or shared, the same number of electrons remain. In a chemical reaction, the number of electrons must be the same on both sides (e.g. radioactive decay).

Hope this helped!

EricZhao3G
Posts: 51
Joined: Tue Oct 08, 2019 12:16 am

Re: Conserved in Chem Rxn

Postby EricZhao3G » Wed Oct 09, 2019 11:47 am

You're right that mass and the number of atoms are conserved. Electrons and protons are also conserved because remember that they have mass as well. If the equation were to gain or lose electrons or protons then the mass wouldn't be balanced between the 2 sides of the equation.

Jacey Yang 1F
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Conserved in Chem Rxn

Postby Jacey Yang 1F » Thu Oct 10, 2019 1:01 am

Yes, electrons and protons must be conserved because they contribute to the atomic mass. According to the law of conservation of mass, the mass of the left side of the equation must equal the mass on the right.

105335337
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: Conserved in Chem Rxn

Postby 105335337 » Thu Oct 10, 2019 9:31 am

The following are conserved:
Mass
Atoms
Electrons
Protons

All must be conserved in order to have a complete chemical reaction.

kristi le 2F
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Conserved in Chem Rxn

Postby kristi le 2F » Fri Oct 25, 2019 11:53 pm

Also, while this isn't directly related to what you asked, also remember that energy is conserved in a reaction as well.


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