Chemistry Worksheet for 10th Graders
Name:___________________________ Date:___________________**
**Section A: Multiple Choice**
1. What is the atomic number of carbon?
a) 6
b) 12
c) 14
d) 16
2. Which of the following is a noble gas?
a) Nitrogen
b) Oxygen
c) Helium
d) Carbon
3. The bond formed between sodium and chlorine in sodium chloride is:
a) Ionic
b) Covalent
c) Metallic
d) Hydrogen
4. What is the chemical symbol for gold?
a) Au
b) Ag
c) Fe
d) Cu
5. Which of the following is a halogen?
a) Sodium
b) Fluorine
c) Calcium
d) Potassium
**Section B: Fill in the Blanks**
6. The atomic number represents the number of ________ in an atom.
7. Water is composed of two hydrogen atoms and one ________ atom.
8. The pH scale ranges from 0 to ________.
9. Chemical bonds are formed due to the attraction between ________ and ________.
10. The formula for sodium chloride is ________.
**Section C: True or False**
11. True or False: Oxygen is the most abundant element in the Earth's atmosphere.
12. True or False: In a chemical reaction, the total mass of the products is always greater than the total
mass of the reactants.
13. True or False: Carbon dioxide is a greenhouse gas.
14. True or False: A catalyst speeds up a chemical reaction by decreasing the activation energy.
15. True or False: The atomic number of an element is equal to the number of protons in its nucleus.
**Section D: Short Answer**
16. Explain the difference between an element and a compound.
17. Describe the process of photosynthesis and its significance.
18. What is an acid, and give an example.
19. Define oxidation and reduction in terms of electron transfer.
20. Why is the periodic table considered one of the most important tools in chemistry?
**Section E: Practical Application**
21. Design a simple experiment to test the pH of common household substances.
22. Research and list three uses of hydrogen peroxide in everyday life.
23. Draw the Lewis dot structure for carbon dioxide (CO2).
24. Discuss the environmental impact of plastic pollution and propose two ways to mitigate it.
25. Explain the concept of stoichiometry and its relevance in chemical reactions.
26. Name three famous female chemists and describe their contributions to the field of chemistry.