Chemical Reactions and Equations — Flashcards
Gujarat Board · Class 10 · Science
30 flashcards for Chemical Reactions and Equations (Gujarat Board Class 10 Science) to test yourself on key terms and facts.
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What are the four main observations that help us determine if a chemical reaction has taken place?
Answer
The four key observations are: 1. Change in state (solid to gas, liquid to solid, etc.) 2. Change in colour 3. Evolution of a gas 4. Change in temperature Example: When magnesium ribbon burns, it cha…
Define a chemical equation and explain what reactants and products are.
Answer
A chemical equation is a symbolic representation of a chemical reaction showing reactants and products using chemical formulae. - Reactants: Substances that undergo chemical change (written on the le…
What is a skeletal chemical equation and why must it be balanced?
Answer
A skeletal chemical equation is the unbalanced form showing only the types and numbers of atoms of each element as they appear in reactants and products. It must be balanced because of the Law of Con…
Balance the following skeletal equation: Fe + H₂O → Fe₃O₄ + H₂
Answer
Solution: 3Fe + 4H₂O → Fe₃O₄ + 4H₂ Step-by-step: 1. Identify the compound with most atoms: Fe₃O₄ (has 3 Fe and 4 O) 2. Balance oxygen: Add coefficient 4 to H₂O → 3Fe + 4H₂O → Fe₃O₄ + H₂ 3. Balance hy…
Write and balance the equation for hydrogen burning in oxygen to form water.
Answer
Word equation: Hydrogen + Oxygen → Water Chemical equation (unbalanced): H₂ + O₂ → H₂O Balanced equation: 2H₂ + O₂ → 2H₂O Explanation: - Oxygen has 2 atoms (O₂), so we need at least 2 water molecul…
When zinc is added to dilute hydrochloric acid, what happens? Write and balance the equation.
Answer
Observations: Zinc reacts vigorously with the acid, producing hydrogen gas (bubbles) and heat (exothermic). Word equation: Zinc + Hydrochloric acid → Zinc chloride + Hydrogen Balanced chemical equat…
What happens when magnesium ribbon is cleaned with sandpaper before burning in air? (Activity 1.1)
Answer
Process: 1. The sandpaper removes the protective oxide layer (MgO) that forms naturally when Mg is exposed to air 2. This allows fresh magnesium to react directly with oxygen 3. When heated, the clean…
Describe the procedure and observations when ferrous sulphate crystals are heated. (Activity 1.5)
Answer
Procedure: 1. Take about 2g ferrous sulphate (FeSO₄·7H₂O) crystals in a dry boiling tube 2. Note the colour (green crystals) 3. Heat gently over a flame Observations: 1. Green colour fades as heating…
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