Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
34 Cards in this Set
- Front
- Back
|
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
|
a. CO -> C + O
b. 2C + O -> CO c. C + O -> CO d. Carbon plus oxygen yields carbon dioxide. |
|
|
In the word equation, sodium oxide + water -> sodium hydroxide, the formula for sodium hydroxide is represented by
|
a. Na .
b. Na O. c. Na OH. d. NaOH. |
|
|
An element in the activity series can replace any element
|
a. in the periodic table.
b. in its group. c. above it on the list. d. below it on the list. |
|
|
The equation AX -> A+X is the general equation for a
|
a. decomposition reaction.
b. combustion reaction. c. synthesis reaction. d. single-displacement reaction. |
|
|
Which observation does NOT indicate that a chemical reaction has occured?
|
a. production of a gas
b. change in total mass of substances c. formation of a precipitate d. evolution of heat and light |
|
|
In a chemical reaction
|
a. the number of atoms in the reactants and products must change.
b. energy as heat must be added to the reactants. c. the mass of the products is greater than the mass of reactants. d. the mass of the reactants equals the mass of the products. |
|
|
In what kind of reaction do two or more substances combine to form a new compound?
|
a. synthesis reaction
b. decomposition reaction c. ionic reaction d. double-displacement reaction |
|
|
The reaction represented by the equation 2Mg(s) + O (g) -> 2MgO(s) is a
|
a. single-displacement reaction.
b. synthesis reaction. c. decomposition reaction. d. double-displacement reaction. |
|
|
The equation A+X->AX is the general equation for a(n)
|
a. ionic reaction.
b. double-displacement reaction. c. synthesis reaction. d. combustion reaction. |
|
|
What can be predicted by using an activity series?
|
a. the amount of energy released by a chemical reaction
b. the melting points of elements c. whether a certain chemical reaction will occur d. the electronegativity values of elements |
|
|
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
|
a. OH.
b. H. c. 2H. d. H . |
|
|
In what kind of reaction do the ions of two compounds exchange places in aqueous soultion to form two new compounds?
|
a. synthesis reaction.
b. combustion reaction. c. double-displacement reaction. d. decomposition reaction. |
|
|
The activity series of metals indicates the ease with which metal
|
a. nuclei fuse.
b. atoms form covalent bonds. c. atoms lose electrons. d. atoms gain neutrons. |
|
|
What is the small whole number that appears in front of a formula in a chemical equation?
|
a. a supscript.
b. a superscript. c. a ratio. d. a coefficient. |
|
|
The equation AX+BY->AY+BX is the general equation for a
|
a. single-displacement reaction.
b. synthesis reaction. c. double-displacement reaction. d. decompostion reaction. |
|
|
The decomposition of a substance by an electric current is called
|
a. ionization.
b. conduction. c. transformation. d. electrolysis. |
|
|
In what kind of reaction does one element replace a similar element in a compound?
|
a. combustion
b. ionic reaction c. decomposition reaction d. displacement reaction |
|
|
The reaction represented by the equation 2HgO(s)->2Hg(l)+O (g) is a(n)
|
a. synthesis reaction.
b. decomposition reaction. c. single-displacement reaction. d. combustion reaction. |
|
|
The equation A+BX->AX+B is the general equation for a
|
a. combustion reaction.
b. double-displacement reaction. c. decomposition reaction. d. single-displacement reaction. |
|
|
A chemical equation is balanced when the
|
a. same number of each kind of atom appears in the reactants and in the products.
b. products and reactants are the same chemicals. c. subscripts of the reactants equal the subscripts of the products. d. coefficients of the reactants equal the coefficients of the products. |
|
|
After the first steps in writing an equation, the equation is balanced by
|
a. changing the products formed.
b. adjusting coefficients to the smallest whole-number ratio. c. adjusting subscripts to the formula(s). d. making the number of reactants equal to the number of products. |
|
|
The reaction represented by the equation Pb(NO ) (aq)+2KI(aq)->PbI (s) + 2KNO (aq) is a
|
a. double-displacement reaction.
b. decomposition reaction. c. synthesis reaction. d. combustion reaction. |
|
|
The reaction represented by the equation Mg(s)+2HCl(aq)->H (g) +MgCl (aq) is a
|
a. decomposition reaction.
b. single-displacement reaction. c. composition reaction. d. double-displacement reaction. |
|
|
In what kind of reaction does a single compound produce two or more simpler substances?
|
a. synthesis reaction
b. decomposition reaction c. single-displacement reaction d. ionic reaction |
|
|
When a solid produced by a chemical reaction separates from the solution it is called
|
a. a reactant.
b. a precipitate. c. a molecule. d. the mass of the product. |
|
|
Each of the four types of reaction stoichiometry problems requires using a
|
a. table of bond energies.
b. chart of electron configurations. c. Lewis structure. d. mole ratio. |
|
|
In the equation 2KClO ->2KCl+3O , how many moles of oxygen are produced when 3.0 mol of KClO decompose completely?
|
a. 1.0 mol
b. 2.5 mol c. 3.0 mol d. 4.5 mol |
|
|
For the reaction represented by the equation C+2H ->CH , how many moles of hydrogen are required to produce 10 mol of methane, CH ?
|
a. 2 mol
b. 4 mol c. 10 mol d. 20 mol |
|
|
A chemical equation is balanced when the
|
a. coefficients of the reactants equal the coefficients of the products.
b. same number of each kind of atom appears in the reactants and in the products. c. number of atoms in each compound in a reaction. d. number of valence electrons involved in the reaction |
|
|
The units of molar mass are
|
a. g/mol.
b. mol/g. c. amu/mol. d. amu/g. |
|
|
In the reaction represented by the equation 2Al O -> 4Al+3O , what is the mole ratio of aluminum to oxygen?
|
a. 10:6
b. 3:4 c. 2:3 d. 4:3 |
|
|
A balanced chemical equation allows one to determine the
|
a. mole ratio of any two substances in the reaction.
b. energy released in the reaction. c. electron configuration of all elements in the reaction. d. mechanism involved in the reaction. |
|
|
Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
|
a. qualitative analysis
b. entropy c. chemical kinetics d. stoichiometry |
|
|
Which coefficients correctly balance the formula NH NO ->N +H O?
|
a. 1,2,2
b. 1,1,2 c. 2,1,1 d. 2,2,2 |
