Science Review

Multiple Choice

100

These are variations of the same element?

• A) Molecules

• B) Atoms

• C) Protons

• D) Isotopes

• D) Isotopes

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

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).

400

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

• A) Carbon

• B) Oxygen

• C) Magnesium

• D) Bromine

C) Magnesium

True or False

100

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

A)True                                                     B)False

A)True

200

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

A)True

B)False

B)False

300

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

A)True

B)False

A)True

400

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

A)True

B)False

B)False

Select All That Apply

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

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

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

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