9th Chemistry Chapter 1

Welcome to your 9th Chemistry Chapter 1

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1. 
Industrial chemistry deals with the manufacturing of compounds:

2. 
Which one of the following compounds can be separated by physical means?

3. 
The most abundant element occurring in the oceans is:

4. 
Which one of the following elements is found in most abundance in the Earth's crust?

5. 
The third abundant gas found in the Earth's atmosphere is:

6. 
One amu (atomic mass unit) is equivalent to:

7. 
Which one of the following molecule is not tri-atomic?

8. 
The mass of one molecule of water is:

9. 
The molar mass of H₂SO₄ is:

10. 
Which one of the following is a molecular mass of O₂ in amu?

11. 
How many number of moles are equivalent to 8 grams of CO₂?

12. 
Which one of the following pairs has the same number of ions?

13. 
Which one of the following pairs has the same mass?

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