객관식
Why must chemical equations be balanced?
174
views
3. Chemical Reactions
Balancing Chemical Equations
객관식
Which of the following is the correctly balanced chemical equation for the reaction between CCl4 and Br2 to produce CBr4 and Cl2?
A
CCl4 + Br2 → CBr4 + Cl2
B
CCl4 + 2 Br2 → CBr4 + 2 Cl2
C
2 CCl4 + 2 Br2 → 2 CBr4 + 2 Cl2
D
CCl4 + Br2 → BrCl + C + CBr4 + Cl2
검증된 단계별 안내1
Identify the reactants and products in the given chemical reaction: CCl4 reacts with Br2 to form CBr4 and Cl2.
Write the unbalanced chemical equation: \(\mathrm{CCl_4 + Br_2 \rightarrow CBr_4 + Cl_2}\).
Balance the carbon atoms first. Since there is 1 carbon atom on both sides, carbon is already balanced.
Balance the halogen atoms next. On the left, there are 4 chlorine atoms in CCl4 and 2 bromine atoms in Br2. On the right, there are 4 bromine atoms in CBr4 and 2 chlorine atoms in Cl2. To balance, adjust coefficients to ensure equal numbers of Cl and Br atoms on both sides.
Set coefficients to balance halogens: place a coefficient of 1 before CCl4, 2 before Br2, 1 before CBr4, and 2 before Cl2, resulting in the balanced equation \(\mathrm{CCl_4 + 2 Br_2 \rightarrow CBr_4 + 2 Cl_2}\).
관련 영상
관련 실천
