Chem 1201 LSUE Borill Exam 1 | 258 Questions With Complete Correct Answers.
An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element?
A) 27.684 amu
B)...
Chem 1201 LSUE Borill Exam 1 | 258 Questions With
Complete Correct Answers.
An element has three stable isotopes with masses of 27.977 amu, 28.976 amu,
and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and
3.09%, respectively. What is the mass of the element?
A) 27.684 amu
B) 29.251 amu
C) 28.085 amu
D) 30.107 amu
E) 28.991 amu
28.085 amu
All of the following will lead to a homogeneous mixture EXCEPT
A) sugar and coffee.
B) mud and water.
C) salt and water.
D) ice tea and lemonade.
E) vinegar and water.
mud and water.
How are gases different from solids and liquids?
A) Gases can only be made up of atoms.
B) The particles in a gas attract each other much more strongly than in solids and
liquids.
C) Gases are compressible.
D) Only gases can take the shape of their container.
E) Gases are colorless.
Gases are compressible.
A scientific law
A) is a brief statement that summarizes past observations and makes predictions.
B) is subject to change via legal action.
C) contains an explanation of observations.
D) must have a mathematical formula.
E) cannot be modified.
is a brief statement that summarizes past observations and makes predictions.
All statements about scientific theories are true EXCEPT
A) they explain why nature behaves the way it does.
B) they must have the ability to make predictions on future behavior.
C) they should use observations to test the theory. D) they are derived from
hypothesis.
E) they are speculation.
they are speculation
A sample of a compound containing only carbon and oxygen decomposes and
produces 24.50g of carbon and 32.59g of oxygen. What is the sample?
A) CO
B) CO2
,C) CO3
D) C3O2
E) C2O
CO
Rutherford's Gold Foil Experiment helped prove
A) the diameter of a gold atom. B) the exact charge of an electrons.
C) the exact mass of a gold atom.
D) that the mass of an atom is concentrated in a very small space.
E) the mass to charge ratio of an electron.
that the mass of an atom is concentrated in a very small space.
Rank in the order of increasing mass.
A) proton, neutron, electron
B) neutron, proton, electron
C) electron, proton, neutron
D) electron, neutron, proton
E) proton, electron, neutron
electron, proton, neutron
The atomic number (Z) is the number of ________ found in the nucleus of an
atom.
A) neutrons
B) protons
C) protons and neutrons
D) electrons
E) protons and electrons
protons
A new compound was recently discovered and found to have an atomic weight of
342.38 amu. This element has two isotopes, the lighter of which has a mass of
340.91 amu and an abundance of 68.322%. What is the mass of the heavier
isotope?
A) 350.21
B) 345.55
C) 342.38
D) 348.67
E) 343.29
345.55
an atom that has lost an electron is
A) a cation.
B) unlikely to be found in homogeneous mixtures.
C) electrically neutral.
D) likely to behave exactly like the parent atom.
E) an anion.
a cation.
Molecules can be described as A) mixtures of two or more pure substances.
B) mixtures of two or more elements that has a specific ratio between
components.
C) two or more atoms chemically joined together.
,D) heterogeneous mixtures.
E) homogeneous mixtures.
two or more atoms chemically joined together.
Give the composition of water. A) two hydrogen atoms and two oxygen atoms
B) one hydrogen atom and one oxygen atom
C) two hydrogen atoms and one oxygen atom
D) one hydrogen atom and two oxygen atoms
two hydrogen atoms and one oxygen atom
Give the composition of hydrogen peroxide.
A) two hydrogen atoms and two oxygen atoms
B) one hydrogen atom and one oxygen atom
C) two hydrogen atoms and one oxygen atom
D) one hydrogen atom and two oxygen atoms
two hydrogen atoms and two oxygen atoms
Identify the characteristics of a liquid.
A) definite volume and definite shape
B) definite volume and no definite shape
C) no definite shape and definite volume
D) no definite shape and no definite volume
definite volume and no definite shape
Identify the characteristics of a solid.
A) definite volume and definite shape
B) definite volume and no definite shape
C) no definite shape and definite volume
D) no definite shape and no definite volum
definite volume and definite shape
Identify the characteristics of a gas.
A) definite volume and definite shape
B) definite volume and no definite shape
C) no definite shape and definite volume
D) no definite shape and no definite volume
no definite shape and no definite volume
Which of the following statements about the phases of matter is TRUE?
A) In both solids and liquids, the atoms or molecules pack closely to one another.
B) Solids are highly compressible.
C) Gaseous substances have long-range repeating order.
D) There is only one type of geometric arrangement that the atoms or molecules
in any solid can adopt.
E) Liquids have a large portion of empty volume between molecules.
In both solids and liquids, the atoms or molecules pack closely to one another.
A substance that can't be chemically broken down into simpler substances is
A) a homogeneous mixture.
B) an element.
C) a heterogeneous mixture.
D) a compound.
E) a gas
, an element.
A substance composed of two or more elements in a fixed, definite proportion is
A) a homogeneous mixture.
B) a heterogeneous mixture.
C) a compound.
D) a solution.
E) an alloy
a compound.
Two or more substances in variable proportions, where the composition is
constant throughout are
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a homogeneous mixture.
E) a crystalline solid
a homogeneous mixture.
Two or more substances in variable proportions, where the composition is
variable throughout are
A) a solution.
B) a homogeneous mixture.
C) a compound.
D) an amorphous solid.
E) a heterogeneous mixture.
a heterogeneous mixture
All of the following are SI base units of measurement, EXCEPT A) meter.
B) gram.
C) second.
D) kelvin.
E) mole.
gram.
Which of the following represents a hypothesis?
A) Sodium reacts with water to form sodium hydroxide and hydrogen gas.
B) Nitrogen gas is a fairly inert substance.
C) Nickel has a silvery sheen. D) When a substance combusts, it combines with
air. E) When wood burns, heat is given off.
When a substance combusts, it combines with air
Which of the following represents a valid hypothesis? A) Neon does not react
with oxygen.
B) Sodium metal reacts violently with water.
C) Lead is soft and malleable. D) Oxygen is a gas at room temperature.
E) Metals tend to lose electrons
Metals tend to lose electrons
The statement, "In a chemical reaction, matter is neither created nor destroyed" is
called
A) the Law of Conservation of Mass.
B) Dalton's Atomic Theory.
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