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CHEM-120 UNIT 7 LAB PRACTICUM 2026 TEST PAPER PROBLEMS SOLUTIONS VERIFIED HIGH SCORE A PLUS

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CHEM-120 UNIT 7 LAB PRACTICUM 2026 TEST PAPER PROBLEMS SOLUTIONS VERIFIED HIGH SCORE A PLUS

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CHEM-120 UNIT 7 LAB PRACTICUM 2026 TEST
PAPER PROBLEMS SOLUTIONS VERIFIED HIGH
SCORE A PLUS

◉ Dependent Variable. Answer: 'Depends' on what you changed →
It's the outcome you measure.


◉ Example of Variables. Answer: If I water plants with different
liquids (independent), then how much they grow changes
(dependent).


◉ Protons. Answer: (+1 charge) - in nucleus


◉ Neutrons. Answer: (0 charge) - in nucleus


◉ Electrons. Answer: (-1 charge) - outside nucleus


◉ Ions. Answer: Atoms with a charge.


◉ Cation. Answer: Positive charge, lost electrons, metal.


◉ Anion. Answer: Negative charge, gained electrons, nonmetal.

, ◉ Isotopes. Answer: Same element but different number of neutrons
(so different mass number).


◉ Atomic Number. Answer: Number of protons.


◉ Mass Number. Answer: Include protons and neutrons.


◉ Neutral Element. Answer: In a neutral element, the number of
electrons = number of protons.


◉ Ionic Compounds. Answer: Contain a metal and a nonmetal. Must
ALWAYS balance the charges.


◉ Dissociation of Ionic Compounds. Answer: Ionic compounds
completely dissociate in water.


◉ Naming Ionic Compounds Step 1. Answer: Name the metal
(cation) first — use the element's name as it is. (Example: Na →
sodium)


◉ Naming Ionic Compounds Step 2. Answer: Name the nonmetal
(anion) second — change the ending of the element's name to '-ide.'
(Example: Cl → chloride)

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