2 окт. 2019 г. · Question 1. Name two scientists who established the laws of chemical combination? Answer: Antoine L. Lavoiser and Joseph L. Proust.

Short Answer Type Questions. Q1. Which of the following represents a correct chemical formula? Name it. (a) CaCl. (b) BiPO4.

Atoms and Molecules Class 9 Extra Questions for Science Chapter 3 with Solutions. Long Answer Questions. Q1. What is radioactivity? What are radioisotopes used ...

Get chapter-wise important questions for CBSE Class 9 Science Atoms and Molecules with answers on Vedantu. Download the PDF for free and revise these ...

Short Answer Type Questions · 1: Give the unit to measure size of atom and give size of hydrogen atom. · 2: What is IUPAC, give its one function? · 3: Give the ...

1. Define polyatomic ion. Give one example. 2. What is formula unit of mass? How is it different from molecular mass? 3. What is Law of conservation of mass?

CBSE Class 9 Science Chapter 3 Extra Questions · 1. What is the compound Al2(SO4), and give the ions present in it. · 2. What is 'atomic mass unit'? How is it ...

QUESTION BANK & REVISION SHEET FOR TERM-II (2017-18). CLASS- IX. SUBJECT: CHEMISTRY. ATOMS AND MOLECULES. Q1. State law of conservation of mass. Q2. State law ...

Which of the following statements is correct? (a) Cathode rays travel in a straight line and have momentum. (b) Cathode rays travel in a straight line and ...

Solved questions. Atom and Molecule of Class 9. Instruction for Exercise. This exercise contains objective Descriptive questions to practice current chapter.