Chem Ch. 01 Test_2020 - 2021

It is theorized that the Big Bang occurred approximately

• 1 billion years ago

• 20.5 million years ago

• 13.6 billion years ago

• 100 billion years ago

__________ are/is believed to be evidence of the Big Bang occurring.

• Cosmic Background Radiation

• Nucleosynthesis

• Supernovae

• Photons

Which of the following elements is believed to have been formed during the formation of the Universe as a consequence of the Big Bang?

• Hydrogen

• Calcium

• Neon

• Carbon

As far as we know, nucleosynthesis, all the different ways elements were formed, includes each of the following except:

• as a product of the Big Bang.

• in the death of a star.

• inside the core of a star.

• when stars collide into one another.

Electrons were first "discovered" thanks to:

• Ernest Rutherford's Gold Foil Experiment.

• J.J. Thomson's Cathode Ray Tube Experiment.

• James Chadwick's Nucleosynthesis Experiment.

• Robert Millikan's Oil Drop Experiment.

Protons were first "discovered" thanks to:

• Ernest Rutherford's Gold Foil Experiment.

• J.J. Thomson's Cathode Ray Tube Experiment.

• James Chadwick's Nucleosynthesis Experiment.

• Robert Millikan's Oil Drop Experiment.

Atoms were once thought to be completely solid spheres but are now known to largely be:

• empty space.

• semi-fluid spheres of positive energy.

• semi-fluid spheres of negative energy.

• spherical in shape with protons and electrons on the outer rim and neutrons scattered throughout the middle.

Ernest Rutherford is credited with making all of the following discoveries with regards to atoms except:

• that atoms contain a dense nucleus.

• that atoms contain protons.

• that atoms contain electrons.

• that J. J. Thomson's Plum Pudding Model was inaccurate.

What is true about H-1, H-2, and H-3 the isotopes of hydrogen.

• They all contain 1 proton.

• They all contain 1 neutron.

• They all have the same atomic mass.

• They all exist in equal quantities.

How many neutrons does an atom of K-39 have?

• 1

• 19

• 20

• 39