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100

These are variations of the same element?

  • A) Molecules

  • B) Atoms

  • C) Protons

  • D) Isotopes


  • D) Isotopes

100

_____ A pure substance can be physically separated into its parts.                                                                             

A)True                                                     B)False



A)True

100

Which of the following are examples of polyatomic molecular elements?

  • [ ] Ozone (O₃)

  • [ ] Nitrogen (N₂)

  • [ ] Phosphorus (P₄)

  • [ ] Sulfur (S₈)

[ ] Sulfur (S₈)

[ ] Phosphorus (P₄)

[ ] Ozone (O₃)

200

How many naturally occurring elements are there before they must be synthesized in a lab?

  • A) 118

  • B) 94

  • C) 7

  • D) 10

B)94

200

_____ Isotopes of the same element have different chemical identities because their mass changes.

A)True

B)False

B)False

200

Which of these are uses for specific isotopes mentioned in the text?

  • [ ] Carbon-14 for dating organic materials

  • [ ] Americium-241 for smoke detectors

  • [ ] Uranium-235 for nuclear fuel

  • [ ] Plutonium-238 for space exploration power

  • [ ] Carbon-14 for dating organic materials

  • [ ] Americium-241 for smoke detectors

300

What did Henry Moseley discover about elements using X-rays?

  • A) Each element has a different number of neutrons.

  • B) Elements emit X-ray patterns corresponding to whole numbers (atomic numbers).

  • C) Elements can be changed into gold using high energy.

  • D) Atoms are solid, indivisible spheres.

  • B) Elements emit X-ray patterns corresponding to whole numbers (atomic numbers).

300

_____ Only two elements on the periodic table exist as liquids at room temperature: Bromine and Mercury.

A)True

B)False

A)True

300

Which of the following are considered "Diatomic Elements"?

  • [ ] Hydrogen (H₂)

  • [ ] Oxygen (O₂)

  • [ ] Sulfur (S₈)

  • [ ] Chlorine (Cl₂)

  • [ ] Phosphorus (P₄)

  • [X] Hydrogen (H₂)
  • [X] Oxygen (O₂)
  • [X] Chlorine (Cl₂) 
400

If an atom has 12 protons, which element is it?

  • A) Carbon

  • B) Oxygen

  • C) Magnesium

  • D) Bromine

C) Magnesium

400

_____ The periodic table is arranged in order of the elements' atomic mass.

A)True

B)False

B)False

400

What are the primary roles of neutrons in the nucleus?

  • [ ] Defining the chemical fingerprint

  • [ ] Adding mass to the atom

  • [ ] Providing stability to the nucleus

  • [ ] Balancing the negative charge of electrons

  • [ ] Providing stability to the nucleus

  • [ ] Adding mass to the atom