In the reaction represented by the equation 2Al2O3 --> 4Al + 3O2, what is the mole ratio of aluminum to
oxygen?
What is 4:3?
100
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
What is 27?
100
The half-life of an isotope is the time required for half the nuclei in a sample to...
What is undergo radioactive decay?
100
Elements in a group or column in the periodic table can be expected to have similar...
What is properties?
100
If repeated measurements agree closely but differ widely from the accepted value, these measurements are...
What is precise, but not accurate?
200
What atom or group of atoms is responsible for the specific properties of an organic compound?
What is functional group?
200
The conjugate of a strong acid is a...
What is weak base?
200
Which of the following is an alkane?
propyne----propene---propane---propyl bromide
What is propane?
200
A substance, made of two or more atoms that are chemically bonded, that can be broken
down into simpler, stable substances is called...
What is a compound?
200
If a gas with an odor is released in a room, it can quickly be detected across the room because it...
What is diffuses?
300
If the temperature of a fixed quantity of gas decreases and the pressure remains unchanged, its volume...
What is decreases?
300
Hemoglobin is a protein that is responsible for...
What is oxygen transport to tissues?
300
Which of the following is not a net ionic equation?
a.) Fe2+(aq) + 2Cl–(aq) + 2OH–(aq) -->Fe(OH)2(s) + 2Cl–(aq)
b.) Ag+(aq) + Cl–(aq) --> AgCl(s)
c.) 3Ca2+(aq) + 2P3–(aq) --> Ca3P2(s)
d.) Cu2+(aq) + S2–(aq) --> CuS(s)
What is a.) Fe2+(aq) + 2Cl–(aq) + 2OH–(aq) -->Fe(OH)2(s) + 2Cl–(aq)?
300
When the limiting reactant in a chemical reaction is completely used, the...
What is the reaction stops?
300
An acid-base titration determines the volumes of two solutions that...
What is chemically equivalent?
400
A chemical reaction involving substances A and B stops when B is completely used. B is the...
What is limiting reactant?
400
How many extra electrons are in the Lewis structure of the phosphate ion, PO4 3–?
What is 3
400
Generally, nonpolar amino acids tend to reside...
What is in the interior of a protein?
400
Which of the following is not a chemical change?
rusting -----melting----- igniting -----burning
What is melting?
400
Which concept in Dalton's atomic theory has been modified?
What is "Atoms cannot be divided."?
500
What is the percentage composition of CuCl2?
What is 47.27% Cu, 52.73% Cl?
500
If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?
What is 91.4 cm?
500
What is the molarity of an HCl solution if 50.0 mL is neutralized in a titration by 40.0 mL of 0.400 M
NaOH?
What is 0.320 M?
500
Which process of radioactive decay always decreases the number of protons by an even number?
What is alpha decay?
500
The reaction represented by the equation 2HgO(s) --> 2Hg(l) + O2(g) is what type of reaction?