Pure Substances, Compounds and Mixtures is one of 9 topics in the Grade 8 Natural Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What is a compound?
A material made of atoms of two or more different elements, chemically bonded together
A material made of only one kind of atom
Two or more substances simply mixed together, not bonded
A single sub-atomic particle
Answer: A material made of atoms of two or more different elements, chemically bonded together — A compound consists of atoms of two or more different elements, chemically bonded together, such as water (H2O).
Easy
2. What is the chemical formula for water?
H2O
H2O2
HO2
H3O
Answer: H2O — Water's chemical formula is H2O: two hydrogen atoms bonded to one oxygen atom.
Medium
3. Give ONE term for the force that holds atoms together within a compound.
Answer: chemical bond — A chemical bond is the force that holds atoms together, both within compounds and within molecules of an element.
