1. Which materials caught fire easily as soon as they were s candle flame? 2. Which materials gave off smell while burning? 3. What was left of each material after burning? 4. Which materials underwent change? What do you change? Let's Learn
Answer (1)
Materials that catch fire easily: Things like paper, cotton, dry leaves, and some fabrics catch fire quickly when exposed to a candle flame because they are flammable solids and have low ignition points.Materials that give off smell while burning: Materials like wood, paper, and some fabrics release a noticeable smell when burned because of the chemicals they contain. For example, burning wood smells like smoke, and some plastics or synthetic fabrics can give off a strong or unpleasant odor.What is left after burning: After burning, most materials leave behind ash or charred remains. For example, paper turns into ash, wood leaves charcoal or ash, and wax melts and partly vaporizes, leaving some residue on the wick or holder.Materials that underwent change and what changed: All materials that burn undergo a chemical change called combustion. This means their original substance changes into new substances like carbon dioxide, water vapor, ash, and smoke. For example, wax changes from solid to vapor and then burns, paper changes into ash and gases, and cotton fabric turns into ash and smoke.So, burning causes a chemical change in materials, transforming them into new substances and often producing heat, light, smell, and residue[tex].[/tex]
