★ Must-know
Further detail
📌 A physical change affects a substance's form while its identity remains the same, whereas a chemical change changes the substance's chemical identity.
Physical change alters form; chemical change alters identity.
1. A laboratory mixture contains two substances that differ in a physical property, and neither substance needs to be chemically changed. What general approach can separate them?
2. A sample contains atoms of just one kind and cannot be broken into simpler substances by physical or chemical means. How should it be classified?
3. A laboratory combines two substances; each retains its own identity, although the resulting material has properties different from its components. What has been formed?
What topics do the lesson objectives explore?
Physical and chemical properties, categories of matter, and chemists’ work.
What happens to a substance’s identity during a physical change?
It remains the same.
What happens to a substance’s chemical identity during a chemical change?
It changes.
Into which two categories is matter classified?
Pure substances and mixtures.
What is consistent throughout a pure substance?
Its composition and its chemical and physical properties.
What is a mixture?
A blend of two or more pure substances that retain their identities.
It covers the core concepts of Matter and Its Classification, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
Read the full study guide →The practice quiz has 15 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.
Take the quiz (15 questions) →There are 27 flashcards on Matter and Its Classification, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.
See all 27 flashcards →Upload a PDF or paste your notes. Revizly writes a study guide, a practice quiz and flashcards in about a minute.