HC Sem Exam Review

Which of the following statements is true about elements?

• A) Elements can be decomposed into simpler substances.

• B) Elements contain only one kind of atom.

• C) Elements are made of two or more different elements joined together.

• D) Elements often contain discrete molecules.

Which of the following is an example of a compound?

• A) Helium (He)

• B) Oxygen (O₂)

• C) Gold (Au)

• D) Water (H₂O)

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What do chemical properties describe?

• The color of a substance

• The ability of a substance to change states of matter

• A substance's ability to change to a different substance

• The size of a substance

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Which of the following is an example of a physical change?

• Rusting of iron

• Ice melting into water

• Combustion

• Digestion

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Which of the following is an example of a chemical change?

• Chopping

• Boiling

• Rotting

• Melting

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Which of the following is an example of a homogeneous mixture?

• Oil and water

• Sand and iron filings

• Salt dissolved in water

• Milk and cereal

Which of the following is NOT a part of Dalton's Atomic Theory?

• All elements are made of atoms

• Atoms of the same element are identical

• Atoms can be created or destroyed in chemical reactions

• Compounds consist of atoms from different elements

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What does the atomic notation 'A' represent?

• Atomic number

• Mass number

• Number of protons

• Number of electrons

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What does the periodic table organize by increasing order?

• Atomic mass

• Atomic number

• Number of neutrons

• Number of protons

Which group of elements is known for being highly reactive metals?

• Alkaline Earth Metals

• Halogens

• Alkali Metals

• Noble Gases