Chemical Equations & Reactions - chpt 8
Write a formula equation: magnesium + oxygen ---> magnesium oxide
2Mg + O2 ---> 2MgO
Balance the following equation: PbO2 ---> PbO + O2
2PbO2 ---> 2PbO + O2
The general equation for a single-replacement reaction is ________
A + BX ---> AX + B
The general equation for a synthesis reaction is ________
A + X ---> AX
In a chemical equation, the symbol (l) indicates that the substance is ______
A liquid
How are a word equation and a formula equation alike? How do they differ from a chemical equation?
A word and formula equation both represent the reactants and products in a chemical reaction, but they have to balance the elements in the reaction, unlike word & formula equations.
The general equation for a double-replacement reaction is ________
AX + BY ---> AY + BX
The general equation for a decomposition reaction is ________
AX ----> A + X
A list of elements ordered by the ease with which they undergo certain chemical reactions is a(n) ________
Activity Series
Write a formula equation: Calcium carbonate ---> calcium oxide + carbon dioxide
CaCO3 ---> CaO + CO2
The names and relative amounts of reactants and products in a chemical reaction are represented using symbols and formulas in a(n) ________
Chemical Equation
Will the reaction occur and what is it's balanced equation: Mg(s) + Co(NO3)2 (aq)
Co + Mg(NO3)2
A small whole number that appears in front of a formula in a chemical equation is called a(n) ________
Coefficient
A chemical reaction in which a substance combines with oxygen, releasing a large amount of energy as heat and light, is a(n) ________
Combustion reaction
The law of ________ must be satisfied for a chemical equation to be balanced.
Conservation of Mass
The decomposition of a substance by an electric current is called ________
Electrolysis
A(n) ________ product is sometimes indicated by an arrow pointing upward.
Gaseous
The symbol --> with triangle on top, means that the reactants are ________
Heated
Oxides of active metals, such as CaO, react with water to form ________
Metal Oxide
What are three observations that indicate a chemical change may be taking place?
Odor, forming of a precipitate, heat will be emitted, and a gas may be formed.
A chemical reaction in which the products re-form the original reactants is a(n) _______
Reversible Reaction
Write the word equation for: 2NaI + Cl2 ---> 2NaCl + I2
Sodium iodine + chlorine gas --> sodium chloride + iodine
Will the reaction occur and what is it's balanced equation: Cl2(g) + MgBr2(aq)
Yes Br2 + MgCl2
Will the reaction occur and what is it's balanced equation: Ni(s) + CuCl2(aq)
Yes Cu + NiCl2
Will the reaction occur and what is it's balanced equation: Zn(s) + HCl(aq)
Yes H + ZnCl
Will the reaction occur and what is it's balanced equation: Cr(s) + H2O(l)
Yes H2 + CrO
Will the reaction occur and what is it's balanced equation: Ni(s) + H2O (l)
Yes H2 + NiO
Will the reaction occur and what is it's balanced equation: Mg(s) + Steam
Yes. Mg(s) + 2H2O (g) ---> Mg(OH2) (aq) + H2 (g)
Will the reaction occur and what is it's balanced equation: Pt(s) + O2(g)
Yes. PtO2
Write the word equation for: 2ZnS(s) + 3O2(g) --> 2ZnO(s) + 2SO2(g)
Zinc sulfide + oxygen gas --> zinc oxide + sulfur dioxide gas
Balance the following equation: Zn(OH)2 + CH3COOH ---> Zn(CH2COO)2 + H2O
Zn(OH)2 + 2CH3COOH ---> Zn(CH2COO)2 + 2H2O
To balance a chemical equation it is permissible to adjust the __ a. Coefficients b. Subscripts c. Formulas of the products d. Number of products
a. Coefficients
The coefficients in a chemical equation ______ a. Indicate the number of moles of each substance that react b. Show the number of grams of each substance that react c. Are the molar masses of the substances d. Show the valence electrons for each atom
a. Indicate the number of moles of each substance that react
The use of a double arrow in a chemical equation indicates that the reaction ___ a. is reversible b. requires heat c. is written backward d. has not been confirmed in the lab
a. is reversible
In a chemical equation, the symbol (aq) indicates that the substance is ____ a. Water b. Dissolved in water c. An acid d. Insoluble
b. Dissolved in water
If metal X is lower than metal Y in the activity series, then ___ a. X will replace ions of Y in solution b. Y will replace ions of X in solution c. Y will form oxides only indirectly d. X will react with cold water.
b. Y will replace ions of X in solution
In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called a(n) ___ a. Synthesis reaction b. Decomposition reaction c. Single-replacement reaction d. Double-replacement reaction
d. Double-replacement reaction
The tendency for a replacement reaction to occur increases as the ___ a. Interval between any two elements in the activity series decreases b. Temperature decreases c. Valence electrons are used up d. Interval between any two elements in the activity series increases
d. Interval between any two elements in the activity series increases
Balance the following equation: AgNO3 + CuCl2 ---> AgCl + Cu(NO3)2
2AgNO3 + CuCl2 ---> 2AgCl + Cu(NO3)2
The production of a slightly soluble solid compound in a double displacement reaction results in formation of a ___ a. Gas b. Precipitate c. Combustion Reaction d. Halogen
B. Precipitate
