Chapter 3: Atoms - The Building Blocks of Matter

Dalton incorporated the law of conservation of mass into his atomic theory by asserting that

• atoms are indivisible

• atoms of different elements have different properties

• matter is composed of atoms

• atoms can be destroyed in a chemical reaction

Tags

NGSS.HS-PS1-7

Oxygen can combine with carbon to form two compounds, carbon monoxide and carbon dioxide. The ratio of the masses of oxygen that combine with a given mass of carbon is 1:2. This is an example of

• the law of conservation of mass

• Dalton's atomic theory

• the law of conservation of energy

• the law of multiple proportions

What is the ratio of oxygen to carbon when 32 g of oxygen combine with 12 g of carbon?

• 1:1

• 2:1

• 1:2

• 8:3

Tags

NGSS.HS-PS1-7

The atomic theory proposed by Dalton has been

• totally discarded

• expanded and modified

• accepted unchanged to the present day

• found to be plagiarized

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

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 positive charge

In Rutherford's experiments, most of the particles

• bounded back

• passed through the foil

• were absorbed by the foil

• combined with the foil

Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?

• nucleus

• electron

• proton

• neutron