4. Open Ended Questions Flashcards
On a hot sunny day, Sarah takes an ice lolly out of the freezer and leaves it on the bench outside. When she returns an hour later, only the stick of the lolly remains. Using your knowledge of chemistry, explain what has happened.
When Sarah left the ice lolly outside on a hot sunny day, the heat from the sun caused the ice lolly to melt. This happens because heat makes the solid ice in the lolly change into a liquid, which is called melting. Over time, as it stayed outside in the heat, the liquid from the melted ice lolly evaporated, meaning it turned into water vapor and disappeared into the air.
When you are too hot, you begin to sweat. Explain how this process helps you cool down.
When you sweat, your body releases water onto your skin. The sweat then evaporates into the air, turning from a liquid into a gas. To do this, it takes heat energy from your skin, which helps to cool you down. This process is called evaporation, and it’s your body’s natural way of staying cool when you’re too hot.
Emma leaves a bowl of hot soup on the table. After some time, she notices the smell of the soup has filled the room. Using your knowledge of chemistry, explain this observation.
The smell of the soup is caused by small gas particles that evaporate from the liquid. These gas particles move randomly and spread out into the surrounding air through diffusion. This is why Emma can smell the soup even when she’s far away.
