Chemistry Chapter 8 Section 1
In a chemical equation, the formula of a substance in water solution is followed by the symbol
(aq)
The formation of a solid product in a chemical reaction is represented by the symbol
(s)
In the expression 3CO₂, the numbers 3 and 2 are, respectively,
3 is the coefficient and 2 is a subscript
What is the total number of molecules that is represented by the following chemical equation? NH₄NO₂ → N₂ + 2H₂O
4
Balance Fe + O₂ → Fe₂O³
4Fe + 3O₂ → 2Fe₂O³
What will be the result of the reaction described by the following chemical equation? PCl₅ (g) ⇌ PCl₃ (g) + Cl₂ (g)
A mixture of PCl₅ and PCl₃ + Cl₂
Write a formula equation for each word equation in the space provided. calcium carbonate → calcium oxide + carbon dioxide
CaCO₃ → CaO + CO₂
Which of the following is a product in the reaction described by the word equation below? iron + copper(II) sulfate → iron(II) sulfate + copper
Iron(II) Sulfate and copper
Which of the following is true regarding the law of conservation of mass?
It dictates that the number of each element must be the same on both sides of a chemical equation.
Which of the following is true regarding a properly written chemical equation?
It must be balanced It must contain proper chemical formulas It should represent known data The number of atoms of each element are the same on both sides of the equation
Write a formula equation for each word equation in the space provided. magnesium + oxygen → magnesium oxide
Mg + O₂ → MgO
What are the products and reactants in the reaction described by the word equation: sodium + water → sodium hydroxide + hydrogen gas
Reactant: Sodium Reactant: Water Product: Sodium Hydroxide Product: Hydrogen gas
Which of the following may indicate that a chemical reaction has occurred?
Release of energy as light or heat A color change Gas bubble formation Formation of a precipitate
Write a word equation for each chemical reaction in the space provided. 2NaI + Cl₂ → 2NaCl + I₂
Sodium Iodide + Chloride → Sodium Chloride + Iodine
You mix solution A with solution B in a beaker. Which of the following observations help you prove that a chemical reaction has occurred?
The breaker becomes warm You see gas bubble out of the solution Solution A is clear, Solution B is clear and the mixture is all yellow
Write a word equation for each chemical reaction in the space provided. 2ZnS(s) + 3O₂(g) → 2ZnO(s) + 2SO₂(g)
Zinc Sulfide + Oxygen → Zinc Oxide + Sulfur Dioxide
Sample Problem C: The reaction of zinc with aqueous hydrochloric acid produces a solution of zinc chloride and hydrogen gas. Write a balanced chemical equation for the reaction.
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
To balance a chemical equation, you must
adjust the coefficients
A _____________uses symbols and formulas to represent the names and relative amounts of reactants and products in a chemical reaction.
chemical equation
From a complete and correctly written chemical equation, you can obtain the
chemical formulas of the reactants and products, relative amounts of the reactants and products, and physical states of the reactants and products.
A small whole number that appears in front of a formula in a chemical equation is called
coefficent
The law of ____________must be satisfied for a chemical equation to be balanced.
conservation of mass
A ______________product is sometimes indicated by an arrow pointing upward.
gaseous
The coefficients in a chemical equation
indicate the number of moles of each substance that react
In a chemical equation, the symbol (l) indicates that the substance is
liquid
The use of a double arrow in a chemical equation indicates that the reaction
reversible
The products re-form the original reactants in a
reversible reaction
The Greek letter delta (∆) above the arrow in a chemical equation means
the reactants are heated
What symbol indicates a reversible reaction?
⇌
