Class 7 Exam > Class 7 Notes > Chemistry Class 7 ICSE > Worksheet: Language of Chemistry
Worksheet: Language of Chemistry | Chemistry Class 7 ICSE PDF Download
Section A: Multiple Choice Questions
Q1. The substances formed after a chemical reaction are called:
a) Reactants
b) Products
c) Catalysts
d) Elements
Q2. Which type of reaction occurs when two or more substances combine to form one product?
a) Combination reaction
b) Decomposition reaction
c) Displacement reaction
d) Neutralisation
Q3. Which form of energy is needed to split water into hydrogen and oxygen?
a) Light
b) Heat
c) Electricity
d) Sound
Q4. What type of change is the rusting of iron?
a) Physical change
b) Chemical change
c) Temporary change
d) Both physical and chemical
Q5. Which of the following is an exothermic reaction?
a) Photosynthesis
b) Decomposition of CaCO₃
c) Slaking of lime (CaO + H₂O → Ca(OH)₂)
d) Electrolysis of water
Section B: Short Answer Questions
Q6. Define chemical reaction. Write one example.
Q7. Differentiate between physical change and chemical change (any two points).
Q8. State two conditions required for chemical reactions to occur.
Q9. What is a catalyst? Give one example.
Q10. Write two observations that indicate a chemical reaction has taken place.
Section C: Long Answer Questions
Q11. Explain the role of heat, light, and electricity in chemical reactions with one example each.
Q12. Write the main characteristics of chemical reactions with examples.
Q13. Distinguish between:
(a) Combination and Decomposition reactions
(b) Exothermic and Endothermic reactions
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FAQs on Worksheet: Language of Chemistry - Chemistry Class 7 ICSE
| 1. What is the significance of the language of chemistry in understanding chemical concepts? |  |
Ans. The language of chemistry is essential for accurately communicating scientific ideas and concepts. It includes the use of symbols, formulas, and terminology that allow chemists to describe substances, reactions, and processes in a precise manner. This standardized language helps prevent misunderstandings and facilitates collaboration among scientists globally.
| 2. How do chemical symbols and formulas represent elements and compounds? | |
Ans. Chemical symbols are one or two-letter notations used to represent elements, derived from their English or Latin names (e.g., H for hydrogen, O for oxygen). Compounds are represented using chemical formulas, which combine the symbols of the constituent elements along with subscripts to indicate the number of atoms (e.g., H₂O indicates two hydrogen atoms and one oxygen atom in a water molecule).
| 3. What role do chemical equations play in chemistry? | |
Ans. Chemical equations are symbolic representations of chemical reactions, showing the reactants and products involved. They provide valuable information about the quantities of substances consumed and produced, conservation of mass, and the direction of the reaction. Balancing chemical equations is crucial to ensuring that the same number of atoms of each element is present on both sides of the equation.
| 4. How can understanding the periodic table aid in learning chemistry? | |
Ans. The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties. It helps students identify relationships between elements, predict the behavior of elements during chemical reactions, and understand trends such as electronegativity and atomic size. Familiarity with the periodic table is fundamental for mastering chemistry concepts.
| 5. Why is it important to learn about acids, bases, and pH in chemistry? | |
Ans. Acids and bases play a vital role in chemical reactions and biological processes. Understanding their properties, such as acidity, basicity, and pH, is crucial for predicting how substances will behave in various environments. The pH scale, which ranges from 0 to 14, helps classify solutions as acidic, neutral, or basic, influencing everything from industrial processes to environmental science and health.
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Oct 11, 2025
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