Multiple Choice
What is the balanced chemical equation for the reaction: Li + CO2 + H2O -> LiHCO3 + H2?
3. Chemical Reactions
Balancing Chemical Equations
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Which of the following correctly balances the chemical equation: CaH2 + H2O → Ca(OH)2 + H2?
A
CaH2 + 3 H2O → Ca(OH)2 + 3 H2
B
CaH2 + 2 H2O → Ca(OH)2 + 2 H2
C
CaH2 + H2O → Ca(OH)2 + H2
D
2 CaH2 + 2 H2O → 2 Ca(OH)2 + 2 H2
Verified step by step guidance1
Identify the number of each type of atom on both sides of the equation. For the unbalanced equation CaH2 + H2O → Ca(OH)2 + H2, count the atoms: Ca, H, and O.
Start by balancing the calcium (Ca) atoms. There is 1 Ca atom on both sides, so calcium is already balanced.
Next, balance the hydrogen (H) atoms. On the left side, there are 2 H atoms from CaH2 and 2 H atoms from H2O, totaling 4 H atoms. On the right side, there are 2 H atoms in H2 and 2 H atoms in Ca(OH)2, totaling 4 H atoms. Adjust the coefficients to balance the hydrogen atoms.
Balance the oxygen (O) atoms. There is 1 O atom in H2O on the left side and 2 O atoms in Ca(OH)2 on the right side. Adjust the coefficient of H2O to balance the oxygen atoms.
Verify that all atoms are balanced. Ensure that the number of each type of atom is the same on both sides of the equation. The balanced equation should have the same number of Ca, H, and O atoms on both sides.
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