Four indicators that a chemical reaction has taken place.
What are color change, production of light & heat, gas/bubbles, and formation of a precipitate.
100
In the balanced chemical equation shown below, CH4 represents one of these.
C + 2H2 --> CH4
What is an atom?
100
Where the most-active element is placed in the series.
What is the top?
100
The balanced equation for the decomposition of water.
What is
2H2O(l) --> 2H2(g) + O2(g)
100
The decomposition of a substance by an electric current.
What is electrolysis?
200
The type of chemical reaction where two or more substances combine to form a new compound.
Give name and provide general example using A and X format.
What is a synthesis reaction?
A + X --> AX
200
The word and formula equations for the chemical reaction that occurs when solid sodium oxide is added to water at room temperature and forms sodium hydroxide (dissolved in the water). Include symbols for physical states in the formula equation.
What is
sodium oxide + water --> sodium hydroxide
and
Na2O(s) + H2O(l) --> 2NaOH(aq)
200
Four metals that will not replace hydrogen in an acid.
What are Cu, Ag, Au, Pt, Sb, Bi, and Hg?
200
The balanced chemical equation for the following reaction: Zinc with aqueous hydrochloric acid produces a solution of zinc chloride and hydrogen gas.
What is
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
200
A small whole number that appears in front of a formula in a chemical equation and indicates the relative amounts of reactants and products.
What is a coefficient?
300
The type of chemical reaction where a substance combines with oxygen, releasing a large amount of energy in the form of light and heat.
What is combustion?
300
The three requirements for writing chemical reactions.
What is:
1. The equation must represent known facts.
2. The equation must contain the correct formulas for the reactants and products.
3. The law of conservation of mass must be satisfied.
300
The metal in a mixture of Ag, Pb, and Fe that will react with ZnCl2.
What is none of these?
300
The properly balanced products of the chemical equation where the reactant ammonium dichromate yields nitrogen, chromium(III) oxide, and water.
(NH4)2Cr2O7(s) -->
What is
(NH4)2Cr2O7(s) --> N2(g) + Cr2O3(s) + 4H2O(g)
300
The definition of an activity series.
What is a list of elements organized according to the ease with which the elements undergo certain chemical reactions?
400
The type of reaction where one element replaces a similar element in a compound.
Give name and provide general example using A, B, X, Y format.
What is a single-replacement reaction?
A + BX --> AX + B or Y + BX --> BY + X
400
The reactant(s) for the double-displacement reaction that produces PF5 and AsCl3.
What is PCl5 and AsF3
400
The result of Br2(l) + KCl(aq)
(use Table 3 on page 286 for help)
What is no reaction?
400
The balanced equation for the combustion of propane (C3H8)
What is
C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g)
400
According to the law of conservation of mass, the total mass of the reacting substances is
A. always more than the total mass of the products.
B. always less than the total mass of the products.
C. sometimes more and sometimes less than the total mass of the products.
D. always equal to the total mass of the products.
D.
500
In double-displacement reactions, the ions of two compounds exchange places in an aqueous solution to form two new compounds. One compound is often soluble and remains dissolved in solution. The other compound is usually this (three possibilities).
What is a precipitate, an insoluble gas that bubbles out of the solution, or a molecular compound (typically water).
500
Which of the following statements is true about the reaction 2F2 + 2H2O --> 4HF + O2?
A. Two grams of O2 are produced when 2 g F2 reacts with 2 g H2O.
B. Two moles of HF are produced when 1 mol F2 reacts with 1 mol H2O.
C. For every 2 mol O2 produced, 6 mol HF are produced.
D. For every 1 mol H2O that reacts, 2 mol O2 are produced.
B.
500
For nonmetals, greater activity means a greater ease of this, to form negative ions.
For metals, greater activity means a greater ease of this, to form positive ions.
What is gain of electrons and loss of electrons?
500
The missing reactant for the following combustion reaction:
______ + 15O2 --> 14CO2 + 6H2O
What is
2C7H6O2
500
In a chemical reaction, the following symbols show what?
1. up arrow
2. down arrow
3. triangle
4. back and forth arrow
1. gas is formed
2. precipitate is formed
3. reactants are heated
4. reaction is reversible