Questions and Answers
Which coefficient placed before HCl will balance the following equation? Zn + HCl → ZnCl2 + H2
In the expression 3H2O, the 3 is a _____, while the 2 is a _____.
coefficient; subscript
Fill in the missing coefficients to balance the chemical equation below: ___ NH3 + ___ O2 → 4NO + 6H2O
4; 5
Fill in the blanks according to the chemical reaction below to indicate how many molecules of each substance are present: N2 + 3H2 → 2NH3
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Fill in the blanks to balance the following chemical equation: ___ P + ___ O2 → P4O6
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Which chemical equation is balanced as written? CuCO3(s) → CuO(s) + CO2(g)
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Which of the following is the balanced equation for the reaction of carbon monoxide (CO) with oxygen to form carbon dioxide?
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Which of the following equations is balanced?
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When the equation below is balanced using the smallest whole number coefficients, what is the sum of all the coefficients? ____ C2H4(g) + ____ O2(g) → _____ CO2(g) + ____ H2O(l)
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A chemical equation is balanced when the number of each type of _____ is the same on both sides of the equation.
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Study Notes
Balancing Chemical Equations
- Coefficient before HCl to balance Zn + HCl → ZnCl2 + H2 is 2.
- In the chemical expression 3H2O, 3 is a coefficient and 2 is a subscript.
- To balance ___ NH3 + ___O2 → 4NO + 6H2O, the coefficients needed are 4 for NH3 and 5 for O2.
- For the equation N2 + 3H2 → 2NH3, the quantities of each substance are: N2-1, H2-3, NH3-2.
- Balancing P + O2 → P4O6 requires 4 for P and 3 for O2.
- The equation CuCO3(s) → CuO(s) + CO2(g) is already balanced as written.
- The balanced reaction for carbon monoxide (CO) with oxygen to form carbon dioxide is 2CO + O2 → 2CO2.
- The balanced equation for the reaction of hydrogen and oxygen to form water is 2H2 + O2 → 2H2O.
- The total sum of coefficients when balancing C2H4(g) + O2(g) → CO2(g) + H2O(l) is 8.
- A chemical equation is considered balanced when the number of each type of element is identical on both sides.
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Test your knowledge on balancing chemical equations with these flashcards. Each card contains a question about coefficients and subscripts in chemical equations, helping you reinforce your understanding of the topic. Perfect for students studying chemistry at any level.
