Choose the answer that shows a correctly balanced equation.?

Question

AgNO3 + Na2 CO3 -> Ag2 CO3 + 2 NaNO3

2 AgNO3 + Na2 CO3 -> Ag2 CO3 + 2 NaNO3

4 AgNO3 + Na2 CO3 -> 4Ag2 CO3 + 2 NaNO3


Choose the answer that shows a correctly balanced equation.

Ni(NO3) 2 + 2 NaOH -> Ni(OH) 2 + 4NaNO3

Ni(NO3) 2 + 2 NaOH -> Ni(OH) 2 + 2 NaNO3

Ni(NO3) 2 + NaOH -> Ni(OH) 2 + 2 NaNO3


Choose the answer that shows a correctly balanced equation.

2 Mg + O2 -> 2 MgO

2 Mg + 2O2 -> 2 MgO

3 Mg + O2 ->3 MgO

Choose the answer that shows a correctly balanced equation.

2Cu + 3 AgNO3 -> 2 Ag + 2Cu(NO3) 2

4Cu + 2 AgNO3 -> 4 Ag + Cu(NO3) 2

Cu + 2 AgNO3 -> 2 Ag + Cu(NO3) 2

Answer 1

That would be:
Choice 2 for the first question
Choice 2 for the second question
and Choice 3 for the third.

I hated balancing these annoying equations in Chemistry too! Thanks goodness I don't have to do so anymore.

Answer 2

For a balanced equation, atoms in (of each element) equal atoms out.

So just pick out the answer that obeys this rule. Nothing more to it.

Answer 3

for the first one----#2
for the second one --#2
for the third-----#3