Gujarat Board Class 10 Science — Flashcards for Quick Revision

A: 1. Change in state (solid to liquid, etc.) 2. Change in colour 3. Evolution of a gas (bubbling, fizzing) 4. Change in temperature (heating up or cooling down) Example: When magnesium burns, it change

A: A chemical equation is a symbolic representation of a chemical reaction using chemical formulas. Components: - Reactants: Substances that undergo change (written on left side) - Products: New substan

A: Chemical equations must be balanced because of the Law of Conservation of Mass, which states that mass can neither be created nor destroyed in a chemical reaction. This means: - Total mass of reactan

A: Acids have the following properties: 1) Sour taste, 2) Turn blue litmus paper red, 3) Conduct electricity in aqueous solution, 4) React with metals to produce hydrogen gas, 5) React with carbonates to

A: Bases have the following properties: 1) Bitter taste, 2) Soapy feel, 3) Turn red litmus paper blue, 4) Conduct electricity in aqueous solution, 5) React with acids to form salt and water, 6) pH greate

A: Acid-base indicators are substances that show different colors in acidic and basic solutions. Examples: Natural indicators - litmus, turmeric, red cabbage; Synthetic indicators - methyl orange, phenol

A: Metallic lustre is the shiny appearance of metals in their pure state. This property makes metals look bright and reflective. Example: Freshly cleaned copper wire or polished silver ornaments show met

A: Malleability: The property of metals to be beaten into thin sheets. Example: Gold and silver are most malleable. Ductility: The property of metals to be drawn into thin wires. Example: Gold is most du

A: Metals are used for making cooking vessels because they are good conductors of heat. This allows heat to transfer efficiently from the flame to the food. Examples: Aluminium and copper are commonly us