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What is the most widely accepted explanation to the origin of the universe?

• Stellar Nucleosynthesis

• Physical Science Handout

• The Big Bang

• Supernova Nucleosynthesis

Approximately how many years ago did the big bang postulate that a hot, dense mass matter experienced a huge explosion?

• 10 billion years ago

• 14 billion years ago

• 5 billion years ago

• 20 billion years ago

What are isotopes?

• Atoms with different numbers of protons

• Atoms with the same number of protons and neutrons

• Atoms with the same number of neutrons but different numbers of protons

• Atoms with the same number of protons but different numbers of neutrons

What did John Joseph Dalton propose in 1808?

• The Law of Conservation of Mass

• Dalton's Atomic Theory

• The Law of Definite Proportions

• The Law of Multiple Proportions

Who discovered X-rays?

• John Joseph Dalton

• Wilhelm Roentgen

• Dmitri Mendeleev

• Ernest Rutherford

What did Aristotle propose about the existence of atoms?

• Atoms are made of the same materials and have different sizes and shapes

• Atoms are indivisible and cannot be divided into smaller units

• Atoms are made up of very small particles called atoms

• Atoms are continuous and can be further divided into smaller pieces

What did Empedocles assert about the composition of all things?

• All matter is composed of four basic substances from which all other substances are created by mixing them together

• All matter is made up of very small particles called atoms

• All things are composed of four principal substances: earth, air, fire, and water

• All matter was continuous and can be further divided into smaller pieces

What did Democritus propose about the nature of matter?

• All matter is made up of very small particles called atoms

• All matter is composed of four basic substances from which all other substances are created by mixing them together

• All matter was continuous and can be further divided into smaller pieces

• All things are composed of four principal substances: earth, air, fire, and water

What did Niels Bohr propose about the atomic model?

• Electrons move in concentric orbits around the nucleus

• Atoms are continuous and can be further divided into smaller pieces

• Atoms are made up of very small particles called atoms

• Atoms are indivisible and cannot be divided into smaller units

What did Joseph Proust propose?

• The Law of Definite Proportions

• Dalton's Atomic Theory

• The Law of Multiple Proportions

• The Law of Conservation of Mass