1、A certain mass of carbon reacts with 13.6 g of oxygen to form carbon monoxide. __________ grams of oxygen would react with that same mass of carbon to form carbon dioxide, according to the law of multiple proportions?
A、136
B、25.6
C、27.2
D、6.8
E、13.6
2、Which statement below correctly describes the responses of alpha, beta, and gamma radiation to an electric field?
A、Both alpha and gamma are deflected in the same direction, while beta shows no response
B、Both alpha and beta are deflected in the same direction, while gamma shows no response
C、Alpha and beta are deflected in opposite directions, while gamma s
3、__________ and __________ reside in the atomic nucleus.
A、Protons, neutrons
B、none of the above
C、Neutrons, only neutrons
D、Protons, electrons
E、Electrons, neutrons
4、Which one of the following is not true concerning cathode rays?
A、They impart a negative charge to metals exposed to them
B、They originate from the negative electrode
C、The characteristics of cathode rays depend on the material from which they are emitted
D、They are made up of electrons
E、They travel in s
5、The charge on an electron was determined in the __________.
A、Millikan oil drop experiment
B、cathode ray tube, by J. J. Thompson
C、atomic theory of matter
D、Rutherford gold foil experiment
E、Dalton atomic theory
6、In the Rutherford nuclear-atom model, __________.
A、the heavy subatomic particles, protons and neutrons, reside in the nucleus
B、the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass and mass is spread essentially uniformly throughout the ato
7、All atoms of a given element have the same __________.
A、number of neutrons
B、number of electrons and neutrons
C、mass
D、number of protons
E、density
8、An atom of the most common isotope of gold, 197Au, has __________ protons, __________ neutrons, and __________ electrons.
A、79, 118, 118
B、79, 118, 79
C、79, 197, 197
D、197, 79, 118
E、118, 79, 39
9、Which combination of protons, neutrons, and electrons is correct for the isotope copper-63, ?
A、63 p+ , 29 n°, 63 e−
B、34 p+ , 29 n°, 34 e−
C、34 p+ , 34 n°, 29 e−
D、29 p+ , 34 n°, 29 e−
E、29 p+ , 29 n°, 63 e−
10、Isotopes are atoms that have the same number of __________ but differing number of __________.
A、protons, neutrons
B、neutrons, electrons
C、electrons, protons
D、protons, electrons
E、neutrons, protons
