Grade 9 Exam - Chemistry🧪 Flashcards
(22 cards)
What is an ion?
An ion is an atom that has a positive (+) or negative (-) charge.
How do atoms become ions?
Atoms gain or lose electrons to become ions.
What forms a negatively charged ion?
Gaining electrons forms a negatively charged ion (anion).
What forms a positively charged ion?
Losing electrons forms a positively charged ion (cation).
What do metals do to form positive ions?
Metals lose electrons to form positive ions.
What do non-metals do to form negative ions?
Non-metals gain electrons to form negative ions.
Fill in the blank: Metal = _______ donor.
electron
Fill in the blank: Non-metal = _______ acceptor.
electron
What is the difference between an atom and a molecule?
An atom is a single particle; a molecule is made of 2 or more atoms bonded together.
What is the difference between an element and a compound?
An element is a substance made up of one type of atom; a compound is made up of 2 or more different types of atoms bonded together.
What are compounds made up of?
Compounds are made up of 2 or more elements that have combined.
What are the two types of compounds?
Ionic and molecular.
What is an ionic compound?
An ionic compound is formed from a metal and a non-metal.
What is an ionic bond?
An ionic bond is formed because positively charged metal ions attract negatively charged non-metal ions.
What is a molecular compound?
A molecular compound is formed when non-metal atoms share valence electrons.
What is a covalent bond?
A covalent bond is formed when non-metal atoms share valence electrons.
List properties of ionic compounds
- Solid at room temperature
- Very high melting points
- Are soluble in water
- Conduct electricity when dissolved in water
List properties of molecular compounds
- Solid, liquid, or gas at room temperature
- Lower melting points than ionic compounds
- Most are insoluble in water
- Do not conduct electricity when dissolved in water
Is H2O an ionic or molecular compound?
Molecular
Is NaCl an ionic or molecular compound?
Ionic
Is CO an ionic or molecular compound?
Molecular
Is BeF an ionic or molecular compound?
Ionic
