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Questions and Answers
Which coefficient placed before HCl will balance the following equation? Zn + HCl → ZnCl2 + H2
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 _____.
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
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
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
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)
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?
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?
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)
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.
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.
