Chem 121 Test 1
Answers
Denning [Date] [Course title]
, The first scientist to show that atoms emit any negative particles was ____________. - Correct Answer
J.J. Thomson
The number of protons, neutrons, and electrons in 39/19K+ are: - Correct Answer 19p, 20n,18e
All of the following are true except: - Correct Answer ions are formed by changing the number of
protons in an atom's nucleus
Consider the element indium, atomic number 49, atomic mass 114.8g. The nucleus of an atom of
indium-112 contains: - Correct Answer 49 protons, 63 neutrons
Which one of the following statements about atomic structure is FALSE? - Correct Answer The number
of protons and neutrons is always the same in the neutral atom
The formula of water, H2O, suggests: - Correct Answer there are two hydrogen atoms and one oxygen
atom per water molecule
Which of the following pairs can be used to illustrate the law of multiple proportions? - Correct Answer
SO and SO2
Many classic experiments have given us indirect evidence of the nature of the atom. Which of the
following did not give the results described? - Correct Answer The Rutherford gold foil experiment
proved the Thomson plum-pudding model of the atom to be essentially correct.
Which of the following statements is true? - Correct Answer 18/8O2- has the same number of electrons
as 20/10Ne and 18/8O and 19/9F have the same number of neutrons
Generally, observed behavior that can be formulated into a statement, sometimes mathematical in
nature, is called a(n): - Correct Answer Natural laws
The Scientific Method - Correct Answer is based on continued observation and experiment
Answers
Denning [Date] [Course title]
, The first scientist to show that atoms emit any negative particles was ____________. - Correct Answer
J.J. Thomson
The number of protons, neutrons, and electrons in 39/19K+ are: - Correct Answer 19p, 20n,18e
All of the following are true except: - Correct Answer ions are formed by changing the number of
protons in an atom's nucleus
Consider the element indium, atomic number 49, atomic mass 114.8g. The nucleus of an atom of
indium-112 contains: - Correct Answer 49 protons, 63 neutrons
Which one of the following statements about atomic structure is FALSE? - Correct Answer The number
of protons and neutrons is always the same in the neutral atom
The formula of water, H2O, suggests: - Correct Answer there are two hydrogen atoms and one oxygen
atom per water molecule
Which of the following pairs can be used to illustrate the law of multiple proportions? - Correct Answer
SO and SO2
Many classic experiments have given us indirect evidence of the nature of the atom. Which of the
following did not give the results described? - Correct Answer The Rutherford gold foil experiment
proved the Thomson plum-pudding model of the atom to be essentially correct.
Which of the following statements is true? - Correct Answer 18/8O2- has the same number of electrons
as 20/10Ne and 18/8O and 19/9F have the same number of neutrons
Generally, observed behavior that can be formulated into a statement, sometimes mathematical in
nature, is called a(n): - Correct Answer Natural laws
The Scientific Method - Correct Answer is based on continued observation and experiment
