Atomic Theory Question Preview (ID: 60552)


Review Of Dalton's Theory, Law Of Conservation Of Mass, And Cathode Ray Tube Experiment. TEACHERS: click here for quick copy question ID numbers.

According to Dalton's atomic theory, atoms
a) a. are destroyed in chemical reactions.
b) b. can be divided.
c) c. of each element are identical in size, mass, and other properties.
d) d. of different elements cannot combine.

Dalton's atomic theory agrees with modern atomic theory except for the statement that
a) all matter is made up of small particles.
b) atoms are not divided in chemical reactions.
c) atoms of the same element are chemically alike.
d) all atoms of the same element have the same mass.

Which of the following statements is true according to modern atomic theory?
a) a. Atoms of the same element may have different masses.
b) b. Atoms may be divided in ordinary chemical reactions.
c) c. Atoms can never combine with any other atoms.
d) d. Cathode rays are composed of protons.

Which statement below accurately describes the contributions of Democritus?
a) ancient Greek philosopher who proposed that matter was not continuous
b) created the modern periodic table
c) proposed the modern Atomic Theory
d) discovered the existence of electrons

Which of the following is NOT part of Dalton's Atomic Theory?
a) Each element is composed of tiny indestructible particles called atoms.
b) All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements.
c) Atoms combine in simple, whole-number ratios to form compounds.
d) Most of the atom's mass and all of its positive charge is contained in a small core called the nucleus.

If 4.0 g of element A combine with 10. g of element B, then 12 g of element A combine with ____ g of element B.
a) a. 10.
b) b. 12
c) c. 24
d) d. 30.

In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ____, to the other electrode.
a) a. cathode
b) b. anode
c) c. electron
d) d. millikan

When an electrical current passed through a glass tube, it caused the surface of the tube directly across from the cathode to glow. Scientists concluded that
a) a. a magnetic field was produced.
b) b. the particles of the beam were negatively charged.
c) c. there was gas in the tube.
d) d. atoms were indivisible.

The rays produced in a cathode tube are
a) a. unaffected by a magnetic field.
b) b. deflected away from a negative plate.
c) c. found to carry a positive charge.
d) d. striking the cathode.

Experiments with cathode rays led to the discovery of the
a) a. proton.
b) b. nucleus. .
c) c. neutron.
d) d. electron

After measuring the ratio of the charge of a cathode-ray particle to its mass, Millikan concluded that the particles
a) a. had no mass.
b) b. had a very small mass.
c) c. had a very large mass.
d) d. carried a positive charge.

Because any element used in the cathode produced electrons, scientists concluded that
a) a. all atoms contained electrons.
b) b. only metals contained electrons.
c) c. atoms were indivisible.
d) d. atoms carried a negative charge.

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