Cathode ray tube and Dalton theory

In early experiments on electricity and matter, an electrical current was passed through a glass tube containing

• water

• gas under high pressure

• liquid oxygen

• gas under low pressure

In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ____ , to the other electrode.

• cathode

• anode

• electron

• 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 magnetic field was produced

• the particles of the beam were negatively charged

• there was gas in the tube

• atoms were indivisible

The rays produced in a cathode tube are

• unaffected by a magnetic field

• deflected away from a negative plate

• found to carry a positive charge

• striking the cathode

Experiments with cathode rays led to the discovery of the

• proton

• nucleus

• neutron

• electron

After measuring the ratio of the charge of a cathode-ray particle to its mass, Thomson concluded that the particles

• had no mass

• had a very small mass

• had a very large mass

• carried a positive charge

Because any element used in the cathode produced electrons, scientists concluded that

• all atoms contained electrons

• only metals contained electrons

• atoms were indivisible

• atoms carried a negative charge

The deflection of cathode rays in Thomson's experiments was evidence of the ____ nature of electrons.

• wave

• charged

• particle

• spinning

Which of the following is not part of Dalton's atomic theory?

• Atoms cannot be divided, created, or destroyed

• The number of protons in an atom is its atomic number

• In chemical reactions, atoms are combined, separated, or rearranged

• All matter is composed of extremely small particles called atoms

Dalton's atomic theory agrees with modern atomic theory except for the statement that

• all matter is made up of small particles

• atoms are not divided in chemical reactions

• atoms of the same element are chemically alike

• all atoms of the same element have the same mass