StudyWithSmile — free flashcards, quizzes and exam practice for school students

Atomic Foundations of Matter

Science · CBSE Class 9 · English Medium · 15 questions and answers

Sample questions

Q: State the law of conservation of mass.

A: Mass can neither be created nor destroyed in a chemical reaction.

Q: State the law of constant proportions.

A: In a pure chemical compound, the elements are always present in definite proportions by mass.

Q: What is an atom?

A: An atom is the smallest particle of an element that takes part in a chemical reaction.

Q: What is a molecule?

A: A molecule is a group of two or more atoms chemically bonded together and capable of independent existence.

Q: What is atomicity?

A: Atomicity is the number of atoms present in one molecule of an element.

Sign in free to study all 15 questions with flashcards, quizzes and spaced revision.