Y10 - Science: Unit 2: Chemistry

What is the chemical formula for: ammonium?

NH₄⁺

What is the chemical formula for: caesium?

Cs⁺

What is the chemical formula for: hydrogen?

H⁺

What is the chemical formula for: lithium?

Li⁺

What is the chemical formula for: potassium?

K⁺

What is the chemical formula for: rudibium?

Rb⁺

What is the chemical formula for: silver?

Ag⁺

What is the chemical formula for: sodium?

Na⁺

What is the chemical formula for: barium?

Ba²⁺

What is the chemical formula for: calcium?

Ca²⁺

What is the chemical formula for: cobalt(II)?

Co²⁺

What is the chemical formula for: copper(II)?

Cu²⁺

What is the chemical formula for: iron(II)?

Fe²⁺

What is the chemical formula for: lead(II)?

Pb²⁺

What is the chemical formula for: magnesium?

Mg²⁺

What is the chemical formula for: manganese(II)?

Mn²⁺

What is the chemical formula for: nickel(II)?

Ni²⁺

What is the chemical formula for: strontium?

Sr²⁺

What is the chemical formula for: zinc?

Zn²⁺

What is the chemical formula for: aluminium?

Al³⁺

What is the chemical formula for: chromium(III)?

Cr³⁺

What is the chemical formula for: iron(III)?

Fe³⁺

Define “ionic bonding” and provide THREE examples.

Referred to as the electrostatic attraction between oppositely charged ions.

Examples: NaCl, H₂S, Fe₂O₃.

Define “covalent bonding” and provide THREE examples.

Referred to as the sharing of electron pairs between atoms (mostly between two non-metals). Examples: H₂, O₂, CH₄.

Explain the difference(s) between ionic bonds and covalent bonds through description.

Ionic bonds are much stronger than covalent bonds. This is because the two oppositely charged ions during the ionic bonding process makes them attracted to each other, while during the process of covalent bonding two non-metals are sharing their electrons.

List the distinction(s) between ionic bonds and covalent bonds through dot-points.

Ionic

1. Stronger

2. Attraction between oppositely charged ions

Covalent

1. Weaker

2. Sharing of electrons

Provide the chemical formula for: potassium nitrate

KNO₃

Provide the chemical formula for: calcium hydrogensulfate

Ca(HSO₄)₂

Provide the chemical formula for: silver oxide

Ag₂O

Provide the chemical formula for: ammonium sulfite

(NH₄)₂SO₃