Class 10 Science: Chemical Reactions and Equations
This worksheet assesses your understanding of different types of chemical reactions, balancing equations, and identifying common observations during chemical changes.
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- Q1.Which of the following statements about the given reaction are correct? 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g) (i) Iron metal is getting oxidised. (ii) Water is getting reduced. (iii) Water is acting as a reducing agent. (iv) Water is acting as an oxidising agent.
- A.(i), (ii) and (iii)
- B.(iii) and (iv)
- C.(i), (ii) and (iv)
- D.(ii) and (iv)
- Q2.In a double displacement reaction, which of the following is typically observed?
- A.Evolution of heat
- B.Formation of a precipitate
- C.Change in temperature only
- D.Change in state of matter without new substance formation
- Q3.The process of respiration is a type of ____ reaction.
- Q4.When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed and sulphuric acid is produced. The reaction is an example of a:
- A.Combination reaction
- B.Displacement reaction
- C.Double displacement reaction
- D.Redox reaction
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What's inside this workbook
This Class 10 Science Practice contains 10 questions across 2 printable pages and includes a full answer key at medium difficulty. Aligned to the CBSE and NCERT syllabus.
How this worksheet helps your child
- Builds confidence in core Science concepts taught in Class 10 through repeated, varied practice.
- Aligned to CBSE and NCERT — questions mirror the pattern children see in school tests and unit assessments.
- Comes with an answer key so parents and students can self-check in minutes, without needing a teacher.
- Pitched at medium level — use it for daily homework, weekend revision or quick exam warm-ups.
About this worksheet
Help your child master the fundamental concepts of chemical reactions and equations with this engaging practice worksheet, specially designed for Class 10 Science students following the CBSE curriculum. This resource provides a comprehensive assessment of your child's understanding of various types of chemical reactions, the crucial skill of balancing chemical equations, and the ability to identify common observations that signify a chemical change has occurred. Chemical reactions are at the heart of everything around us, from the food we digest to the rusting of iron, and a strong grasp of this topic lays a vital foundation for future studies in science. This worksheet is ideal for students who have completed the initial learning phase of this chapter and are looking for a medium-difficulty practice tool to consolidate their knowledge and prepare for examinations. It aligns perfectly with NCERT guidelines, ensuring that your child practices relevant and important concepts.
What your child will learn
- Practice identifying different types of chemical reactions, such as combination, decomposition, displacement, and double displacement reactions.
- Solve problems requiring the balancing of chemical equations using systematic methods.
- Recognise common observations like gas evolution, precipitate formation, or colour change that indicate a chemical reaction.
- Apply knowledge of oxidation and reduction processes to simple chemical reactions.
- Understand the significance of a balanced chemical equation in representing conservation of mass.
Understanding the concept
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Essentially, it's when atoms rearrange themselves to form new substances. We can't see atoms, so we represent these reactions using chemical equations. For example, when hydrogen gas (H₂) burns in oxygen gas (O₂), it forms water (H₂O). The equation starts as H₂ + O₂ → H₂O. However, there's a crucial rule called the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction. This means the number of atoms of each element must be the same on both sides of the equation. This is where balancing comes in. We adjust the coefficients (the numbers in front of the chemical formulas) to make sure the atoms balance out. For H₂ + O₂ → H₂O, we would balance it to 2H₂ + O₂ → 2H₂O. Now, there are four hydrogen atoms and two oxygen atoms on both sides. Reactions can be classified into different types, like combination (two or more reactants form one product), decomposition (one reactant breaks into two or more products), displacement (one element replaces another in a compound), and double displacement (ions exchange between two compounds). Understanding these types helps predict product formation and understand reaction mechanisms. Oxidation and reduction are also key concepts, often occurring together (redox reactions), involving the gain or loss of oxygen/hydrogen, or more fundamentally, the loss or gain of electrons respectively.
Tips for parents & teachers
- Encourage your child to first attempt the problems independently before checking their answers.
- Review any incorrect answers together, discussing the correct approach and the concepts involved.
- Have your child explain the different types of reactions in their own words after completing the worksheet.
- For balancing equations, suggest they create a table to count atoms on both reactant and product sides.
- Connect the concepts to everyday examples, like rusting of iron or cooking food, to make learning more relatable.
Topics covered
How to use this worksheet at home
Open the print view and use your browser's Print dialog to print on regular A4 paper or save as a PDF. Hand the printed sheet to your child (Class 10) and set a relaxed time limit — 15 to 25 minutes works for most Science worksheets. When they're done, open the "With answer key" view and let them self-mark question by question. Re-print as many times as you need; the file never expires and there's no download limit.
Frequently asked questions
- Is this Science worksheet really free?
- Yes — every workbook on WorkbookWala is 100% free to download and print. No login, no email, no paywall. We're free for students, parents and teachers.
- Is it aligned to the CBSE / NCERT syllabus?
- Yes. All Class 10 worksheets are built around the CBSE and NCERT pattern so they map cleanly to what your child is studying in school.
- Can I print this worksheet at home?
- Yes. Click "Open print view" and use your browser's Print dialog to print on standard A4 paper, or save it as a PDF for later. The layout is designed to fit cleanly without scaling.
- Does it include an answer key?
- Yes — click "With answer key" to print a version with answers included, so parents and students can self-mark in minutes.
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