Question 1
EasyQuestion
Crystallisation is useful because it helps:
Topic: Crystallisation · Skill: Describe crystallisation as a method of obtaining pure crystals
Explorer · Grades 4-8
Assignment Practice
Physical And Chemical Changes: Crystals, Burning And Reasoning
Reason with changes
Preview
Explorer question styleInside this assignment
First 4 questions from the learning flow.
Crystallisation and Burning · 5 questionsReversibility and Evidence · 5 questions
Crystallisation and Burning
Understand crystals and chemical reactions.
Choose the best answer for each question.
Question 2
EasyQuestion
Burning of magnesium ribbon is a chemical change mainly because:
Topic: Burning and Reactions · Skill: Classify burning and cooking as chemical changes
Question 3
EasyQuestion
Which comparison is correct?
Topic: Reversible and Irreversible · Skill: Compare reversible/irreversible changes with physical/chemical changes
Question 4
MediumQuestion
A white powder is heated and gives off a gas, leaving a different solid. What is the best classification?
Topic: Application and Reasoning · Skill: Justify classification of unfamiliar changes
What this assignment covers
Use crystallisation, burning, reversibility and unfamiliar observations to reason about changes.
Skills and sections
Describe crystallisation as a method of obtaining pure crystals, Classify burning and cooking as chemical changes, Compare reversible/irreversible changes with physical/chemical changes, Justify classification of unfamiliar changes
- Crystallisation and Burning: 5 questions
- Reversibility and Evidence: 5 questions