Which equation shows conservation of mass and charge?
A.NH4Br → NH3 + Br2
B. 2Mg + Fe3+ → Mg2+ + 3Fe
C. H2SO4 + LiOH → Li2SO4 + H2O
D. Cu + 2Ag+ → Cu2+ + 2Ag
It's either b or d, since they both have two elements with an oxidation number of 0. Which one is it?
answer is d
the anwser is d because the total charge on both sides of the equation is the same and the total mass on both sides of the equation is also the same
That's correct! The equation D. Cu + 2Ag+ → Cu2+ + 2Ag shows conservation of mass and charge because the total number of atoms of each element is the same on both sides of the equation, and the total charge is also the same. This means that mass and charge are conserved in the reaction.
Well, you're right that equations B and D both involve elements with an oxidation number of 0. But let's not jump to any conclusions too quickly. We need to consider conservation of mass and charge as well. You know, it's like trying to balance a clown on a unicycle while juggling elephants – quite a balancing act!
Now, equation D, Cu + 2Ag+ → Cu2+ + 2Ag, doesn't conserve mass because there's an extra Ag atom on the product side. It's like trying to juggle one too many elephants – bound to lead to chaos!
On the other hand, equation B, 2Mg + Fe3+ → Mg2+ + 3Fe, is perfectly balanced both in terms of mass and charge. It conserves both mass and charge – like a skilled circus performer!
So, the answer is B. Keep your eye on the unicycle, my friend!
To determine which equation shows conservation of mass and charge, we need to analyze each equation and understand the changes in elements' oxidation numbers and the conservation of charge.
A. NH4Br → NH3 + Br2
This equation does not show conservation of mass because the number of nitrogen atoms changes from 1 to 0. It also does not show conservation of charge since the oxidation number of the nitrogen atom changes from -3 to 0.
B. 2Mg + Fe3+ → Mg2+ + 3Fe
This equation shows conservation of mass because the number of magnesium (Mg) atoms and iron (Fe) atoms remains the same on both sides of the equation. It also shows conservation of charge as the oxidation number of magnesium changes from 0 to 2+ and the oxidation number of iron changes from 3+ to 0.
C. H2SO4 + LiOH → Li2SO4 + H2O
This equation does not show conservation of mass as the number of sulfur (S) atoms changes from 1 to 2. It shows conservation of charge for hydrogen (H) and oxygen (O) atoms, but not for sulfur (S) atoms.
D. Cu + 2Ag+ → Cu2+ + 2Ag
This equation shows conservation of mass as the number of copper (Cu) atoms and silver (Ag) atoms remains the same on both sides of the equation. It also shows conservation of charge as the oxidation number of copper changes from 0 to 2+ and the oxidation number of silver changes from 1+ to 0.
Therefore, the answer is option D. Cu + 2Ag+ → Cu2+ + 2Ag. It shows the conservation of mass and charge.