chem 121 final multiple choice questions

what is the difference between a theory and a law?

a. one is verified by experiments the other is not

b. one is reproducible the other is not

c. one describes the other explains

d. one is published the other is not

c

which of the following is not an extensive property?

a. the mass of a container of NaCl

b. the volume of a bottle of soda

c. the area of a triangle

d. the boiling point of ethanol

d

which metric prefix represents a multiplier of 10-9?

a. micro

b. pico

c. milli

d. nano

d

which statement is not part of Dalton’s Atomic Theory?

a. matter is composed of small particles called atoms

b. all atoms of an element are identical in every way

c. atoms cannot be created or destroyed in a chemical reaction

d. isotopes are atoms of the same element with different numbers of neutrons

d

__________ are molecules with the same formulas but different arragnements of atoms

isomers

___________ is the number of protons and neutrons int eh nucleus

mass number

an ____________ property does not depend on the amount of substance

intensive

____________ mixtures have more than one phase

heterogenous

______________ is how close a measurement is to an accepted value

accuracy

for each of the following element names provide the symbol of the element.

a. Potassium

b. Fluorine

c. Arsenic

d. Manganese

K, F, As, Mn

how many sig figs are there in each of the following?

a. 0.09 m

b. 0.550 kg

c. 725.00 s

d. the answer to (0.135+0.6) x 11.82

1, 3, 5, 1

(scientist) discovered x-rays

roentgen

(scientist) charge to mass ratio of an electron

thomson

(scientist) periodic table

mendeleev

(scientist) oil drop experiment

millikan

(scientist) atomic number

moseley

the limiting reagent in a chemical reaction is one that?

a. has the largest molar mass (formula weight)

b. has the smallest molar mass (formula weight)

c. has the smallest coefficient

d. is consumed completely

d

which of the following is a weak acid?

a. H2SO4

b. HClO3

c. HF

d. HCl

c

consider the following reaction: 4NH3 + 5O2 —> 4NO + 6H2O. the element being oxidized and oxidizing agent are:

a. N and NH3

b. N and O2

c. O and NH3

d. O and O2

b

which one of the following statements is FALSE?

a. for the reaction of a strong acid with a strong soluble base, the net ionic equation is always H+ + OH- —> H2O

b. “spectator ions” appear in the total ionic equation for a reaction, but not in the net ionic equation

c. H2CO3, HCl, and HNO3 are all examples of strong acids

d. in a neutralization reaction, an acid reacts with base to produce a salt and H2O

c

classify each of the following as either true or false.

a. single replacement reactions are always redox reactions

b. the substance being oxidized is the reducing agent

c. the more active a metal, the more easily it is reduced

d. H2O is a nonelectrolyte

T, T, F, T

a verbal statement of the 1st law of thermodynamics is

a. endothermic reactions absorb heat

b. enthalpy is a state function

c. the total amount of energy in the universe is constant

d. a calorie is the amount of heat needed to change the temp of 1 gram of water by 1 C

c

which of the following processes is exothermic?

a. boiling of water

b. freezing of water

c. evaporation of sweat

d. sublimation of dry ice

b

in a closed system

a. both energy and matter transfer

b. neither energy or matter transfer

c. energy transfers but not matter

d. matter transfer but not energy

c

which of the following statements does not describe the Pauli principle?

a. no 2 electrons in an atom can have identical sets of all 4 quantum numbers

b. to be in the same orbital, electrons must have opposite spin quantum numbers

c. it is also known as the Exclusion Principle

d. the energies of an electron in an atom are quantized

d

which of the following transitions in a Hydrogen atom would be in the Balmer series?

a. n=2 to n=1

b. n=4 to n=2

c. n=6 to n=3

d. n=5 to n=4

b

which of the following sets of quantum numbers is not possible?

a. n=5, l=3, m=2

b. n=3, l=2, m=-1

c. n=3, l=0, m=0

d. n=4, l=4, m=3

d