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Chem 121 - Module 1 Exam 2025|Actual Exam Set
Questions And Verified Answers (Correct solutions) |
Get It 100% Accurate!!
speed = - (ANSWER)distance / time
time SI unit and symbol - (ANSWER)seconds (s)
length SI unit and symbol - (ANSWER)meter (m)
temperature SI unit and symbol - (ANSWER)kelvin (K)
Elements - (ANSWER)Pure substances that cannot be broken down into simpler
substances by chemical changes
Extensive property - (ANSWER)a property that depends on the amount of matter
present (like mass and volume)
Intensive property - (ANSWER)the property of the sample does not depend on
the amount of matter present (temperature)
atom - (ANSWER)smallest particle of an element that has the properties of that
element and can enter into a chemical combination.
, 2
molecule - (ANSWER)consists of two or more atoms joined by strong forces called
chemical bonds
electron - (ANSWER)a negatively charged, subatomic particle with a mass more
than one thousand times less that of an atom.
isotopes - (ANSWER)atoms of the same element that differ in mass
Millikan - (ANSWER)Robert A. Millikan determined the charge of an electron
using an "oil drop" experiment.
Thomson - (ANSWER)J.J. Thomson used a cathode ray tube to calculate the mass-
to-charge ratio of cathode ray particles and ultimately discovered the electron.
Rutherford - (ANSWER)Ernest Rutherford fired 𝛂-particles at gold foil which led
to the discovery of the proton.
Which two subatomic particles are found in the nucleus? - (ANSWER)protons and
neutrons
unit of measurement for atomic mass unit - (ANSWER)amu
mass number (A)= - (ANSWER)number of protons + number of neutrons
Chem 121 - Module 1 Exam 2025|Actual Exam Set
Questions And Verified Answers (Correct solutions) |
Get It 100% Accurate!!
speed = - (ANSWER)distance / time
time SI unit and symbol - (ANSWER)seconds (s)
length SI unit and symbol - (ANSWER)meter (m)
temperature SI unit and symbol - (ANSWER)kelvin (K)
Elements - (ANSWER)Pure substances that cannot be broken down into simpler
substances by chemical changes
Extensive property - (ANSWER)a property that depends on the amount of matter
present (like mass and volume)
Intensive property - (ANSWER)the property of the sample does not depend on
the amount of matter present (temperature)
atom - (ANSWER)smallest particle of an element that has the properties of that
element and can enter into a chemical combination.
, 2
molecule - (ANSWER)consists of two or more atoms joined by strong forces called
chemical bonds
electron - (ANSWER)a negatively charged, subatomic particle with a mass more
than one thousand times less that of an atom.
isotopes - (ANSWER)atoms of the same element that differ in mass
Millikan - (ANSWER)Robert A. Millikan determined the charge of an electron
using an "oil drop" experiment.
Thomson - (ANSWER)J.J. Thomson used a cathode ray tube to calculate the mass-
to-charge ratio of cathode ray particles and ultimately discovered the electron.
Rutherford - (ANSWER)Ernest Rutherford fired 𝛂-particles at gold foil which led
to the discovery of the proton.
Which two subatomic particles are found in the nucleus? - (ANSWER)protons and
neutrons
unit of measurement for atomic mass unit - (ANSWER)amu
mass number (A)= - (ANSWER)number of protons + number of neutrons
