HW 4A - Balancing Chemical Reactions
Balance the following equation in standard form and determine the sum of the coefficients. LiAlH4(s) + AlCl3(s) --> AlH3(s) + LiCl(s) 8 12 11 9 10
11
When the equation below is balanced, what is the coefficient of oxygen gas? C7H16(g) + O2(g) --> CO2(g) + H2O(g) 2 11 5 14 8
11
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? NO2 + H2O --> HNO3 + NO 3 4 1 5 2
3
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? NO2 + H2O --> HNO3 + NO Group of answer choices 2 3 1 5 4
3
When the equation below is balanced, what is the coefficient for HF? Si(s) + HF(aq) --> SiF4(g) + H2(g) 0 4 3 1 2
4
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? Al + Fe3O4 --> Al2O3 + Fe Group of answer choices 12 3 1 9 6
9
Which of the following statements is NOT true of balancing a chemical equation? Group of answer choices Phases are often shown for each compound but are not critical to balancing an equation. Coefficients are used to balance the atoms on both sides. Subscripts in the reactants must be conserved in the products. The law of conservation of matter must be followed. All of the statements are true.
Subscripts in the reactants must be conserved in the products.
All of the following are clues that a chemical reaction has taken place except Bubbles form. The reactant is smaller. A flame occurs. A color change occurs. A solid forms.
The reactant is smaller
True or false? Coefficients can be fractions when we are balancing a chemical equation. True False
True
In balancing an equation, we change the ________ to make the number of atoms on each side of the equation balance. formulas of substances in the reactants subscripts of substances formulas of substances in the products coefficients of substances
coefficients of substances
