AnswersCISD-Chemistry A-CRUnit Test

Unit Test — Unit test Answers

0 verified answers
21
Free Preview

The diagram shows Niels Bohr’s model of an atom. What happens when the electron moves from the first energy level to the second energy level?

Question illustration
A
Energy is absorbed, and an emission line is produced.
B
Energy is released, and an emission line is produced.
C
Energy is absorbed by the atom.
D
Energy is lost from the atom.
22
Free Preview

The table below gives the numbers of protons, electrons, and neutrons in four atoms.AtomNumber of protonsNumber of neutronsNumber of electrons198929983991049109Based on the table, which atom has a charge of –1?

A
1
B
2
C
3
D
4
23

Which conclusion could be made from Ernest Rutherford’s gold foil experiment?

A
Atoms are made up of mostly empty space.
B
Atoms are mainly solid and block alpha particles.
C
The volume of the nucleus is large compared to the rest of the atom.
D
The mass of the nucleus is small compared to the rest of the atom.
24

Which scientist provided a foundation for John Dalton’s work on the atomic structure?

A
Robert Millikan
B
Joseph Proust
C
Ernest Rutherford
D
J. J. Thomson
25

From his experiments, J. J. Thomson concluded that

A
cathode ray particles can move at very fast speeds.
B
cathode ray particles can be moved by electric current.
C
atoms contain small positively charged particles that are called protons.
D
atoms contain small negatively charged particles that are called electrons.

Did you find these answers helpful?