Class 7 Exam > Class 7 Notes > Class 7 Oxford Science: Chapter Notes, Worksheets & Tests > Worksheets: Chemical & Chemical Changes
Chemical and Chemical Changes Class 7 Worksheet Science Chapter 5
| Table of contents |
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| Section A: Multiple Choice Questions |
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| Section B: Short Questions |
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| Section C: Fill in the Blanks |
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| Section D: Match the Column |
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| Section E: True or False |
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Section A: Multiple Choice Questions
Q.1. Which of the following is not a chemical substance?
(a) Oxygen
(b) Water
(c) Sugar
(d) Sand
Q.2. Which of the following is a chemical change?
(a) Melting of ice
(b) Burning of wood
(c) Cutting of paper
(d) Mixing of salt and water
Q.3. What is the chemical symbol for gold?
(a) Ag
(b) Au
(c) Fe
(d) Pb
Q.4. Which of the following is a physical change?
(a) Rusting of iron
(b) Baking of a cake
(c) Digestion of food
(d) Burning of fuel
Q.5. What is the chemical formula for water?
(a) H2SO4
(b) CO2
(c) NaCl
(d) H2O
Section B: Short Questions
Q.1. Define a chemical change.
Q.2. What is the difference between a chemical substance and a mixture?
Q.3. Write the chemical formula for sodium chloride.
Q.4. Give an example of a physical change.
Q.5. Explain what happens during crystallization.
Section C: Fill in the Blanks
Q.1. Chemical substances are made up of _____________.
Q.2. The shorthand way of representing an element is its _______________.
Q.3. The combination of symbols and numbers which indicates the number of atoms in a molecule is called the _______________.
Q.4. A chemical reaction is represented by a _____________.
Q.5. The process of separating a solid from a solution by cooling it is called _______________.
Section D: Match the Column
Match the following symbols with their respective elements:
Section E: True or False
Q.1. A chemical change is reversible. ______
Q.2. Physical changes do not change the nature of the substance. ______
Q.3. Chemical formulae are used to represent the composition of a substance. _____
Q.4. Crystallization is a physical change. ______
Q.5. Chemical reactions occur when substances are heated. ______
You can access the solutions to this worksheet here.
The document Chemical and Chemical Changes Class 7 Worksheet Science Chapter 5 is a part of the Class 7 Course Class 7 Oxford Science: Chapter Notes, Worksheets & Tests.
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FAQs on Chemical and Chemical Changes Class 7 Worksheet Science Chapter 5
| 1. What are the main differences between physical and chemical changes? |  |
Ans.Physical changes involve a change in the state or appearance of a substance without altering its chemical composition, such as melting ice or boiling water. Chemical changes, on the other hand, result in the formation of new substances with different properties, like rust forming on iron.
| 2. Can you give examples of everyday chemical changes? | |
Ans.Examples of everyday chemical changes include baking a cake (where ingredients react to form a new product), burning wood (which produces ash and smoke), and digestion of food (where enzymes break down food into new substances).
| 3. How can we identify a chemical change has occurred? | |
Ans.Indicators of a chemical change include the formation of a gas (bubbles), a change in color, the formation of a precipitate (solid), and the release or absorption of heat (temperature change).
| 4. What is the importance of understanding chemical changes in daily life? | |
Ans.Understanding chemical changes is important as it helps us make informed decisions about cooking, cleaning, and using various products safely. It also aids in recognizing how substances interact in our environment, affecting health and safety.
| 5. How do chemical reactions relate to the conservation of mass? | |
Ans.According to the law of conservation of mass, in a chemical reaction, the total mass of the reactants equals the total mass of the products. This means that atoms are neither created nor destroyed during a chemical change, only rearranged.
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Oct 26, 2024 Last updated |
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