Honors Chemistry Pre-Test

Who introduced the term "atomos" and what does it mean?

• Aristotle

• Democritus

• Plato

• Proust

Which statement best describes the Law of Conservation of Mass?

• The mass of the products in a chemical reaction is always less than the mass of the reactants.

• The total mass remains the same before and after a chemical reaction, regardless of the type of reaction.

• Chemical reactions always create new mass in the form of energy.

• The mass of individual atoms increases during a chemical reaction.

What does the Law of Conservation of Mass state?

• Mass is destroyed in chemical reactions.

• Mass is conserved in chemical reactions.

• Mass can be created and destroyed.

• Mass increases during chemical reactions.

Which of the following is an example of the Law of Definite Proportions?

• A compound always contains the same elements in the same fixed ratios by mass.

• The properties of a compound can vary based on the method of preparation.

• Different samples of water (H₂O) can have varying ratios of hydrogen and oxygen.

• The mass of the reactants is always equal to the mass of the products.

Which scientist proposed the Law of Definite Proportions?

• John Dalton

• J.J. Thompson

• Joseph Proust

• Niels Bohr

According to Dalton’s atomic theory, atoms are...

• Divisible and can be created or destroyed.

• Indivisible and indestructible.

• Made of protons, neutrons, and electrons.

• Large enough to be seen under a microscope.

What was J.J. Thompson's major contribution to atomic theory?

• He discovered the neutron.

• He discovered the proton.

• He discovered the electron.

• He developed the quantum model.

What is the charge of a proton?

• +2

• +1

• 0

• -1

Where are neutrons located in an atom?

• In the electron cloud.

• In the nucleus.

• In the outer shell.

• In the proton shell.

Where are electrons located in an atom?

• Inside the nucleus, along with protons and neutrons.

• In fixed orbits directly attached to the nucleus.

• In an electron cloud surrounding the nucleus in various energy levels.

• In between the protons and neutrons in the nucleus.