conservation in chemical reactions quick check
in which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products? (1 point)
○ zn + 2hcl → h₂ + zncl₂
○ li₂co₃ → lio + co₂
○ ch₄ + o₂ → co₂ + 2h₂o
○ co₂ + h₂o → ch₂oh + o₂

Question

Accepted Answer

# Explanation:
## Step1: Check the first equation
For $Zn + 2HCl \to H_2+ZnCl_2$,
- Reactants: $1$ $Zn$ atom, $2$ $H$ atoms ($2\times1$ from $HCl$), $2$ $Cl$ atoms ($2\times1$ from $HCl$).
- Products: $2$ $H$ atoms ($H_2$), $1$ $Zn$ atom ($ZnCl_2$), $2$ $Cl$ atoms ($ZnCl_2$).
## Step2: Check the second equation
For $Li_2CO_3\to LiO + CO_2$,
- Reactants: $2$ $Li$ atoms ($Li_2CO_3$), $1$ $C$ atom ($Li_2CO_3$), $3$ $O$ atoms ($Li_2CO_3$).
- Products: $1$ $Li$ atom ($LiO$), $1$ $C$ atom ($CO_2$), $3$ $O$ atoms ($1$ from $LiO$ and $2$ from $CO_2$). But $Li$ atoms are not balanced ($2$ vs $1$).
## Step3: Check the third equation
For $CH_4+O_2\to CO_2 + 2H_2O$,
- Reactants: $1$ $C$ atom ($CH_4$), $4$ $H$ atoms ($CH_4$), $2$ $O$ atoms ($O_2$).
- Products: $1$ $C$ atom ($CO_2$), $4$ $H$ atoms ($2\times2$ from $2H_2O$), $4$ $O$ atoms ($2$ from $CO_2$ and $2$ from $2H_2O$). But $O$ atoms are not balanced ($2$ vs $4$).
## Step4: Check the fourth equation
For $CO_2+H_2O\to CH_2OH+O_2$,
- Reactants: $1$ $C$ atom ($CO_2$), $2$ $H$ atoms ($H_2O$), $3$ $O$ atoms ($2$ from $CO_2$ and $1$ from $H_2O$).
- Products: $1$ $C$ atom ($CH_2OH$), $3$ $H$ atoms ($CH_2OH$), $3$ $O$ atoms ($1$ from $CH_2OH$ and $2$ from $O_2$). $H$ atoms are not balanced ($2$ vs $3$).

# Answer:
$Zn + 2HCl \to H_2 + ZnCl_2$

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QUESTION IMAGE

Question

Explanation:

Step1: Check the first equation

Step2: Check the second equation

Step3: Check the third equation

Step4: Check the fourth equation

Answer: