Convection in Gases and Liquids lab: Materials Required : 500-ml Beaker. Water b
ID: 2075780 • Letter: C
Question
Convection in Gases and Liquids lab:
Materials Required :
500-ml Beaker.
Water
balance
Small piece of paper
black pepper
hot plate
candle.
Procedure :
1. Pour 300ml of water into the beaker.
2. Place a small piece of paper on the balance, and use the balance to measure 1g of black pepper.
3. Sprinkle the pepper into the beaker of the water and let it settle to the bottom of the beaker.
4. Heat the bottom of the beaker using the hot plate. do not boil the water.
5. Observe how the particles of the pepper move as the water is heated and to make a drawing showing their motion.
6. Turn off the hot plate. Light the candle and let it burn for a few minutes.
7. Blow out the candle and observe the motion of the smoke.
Observations :
when the water is heated, water volume got increased. No change in mass. But the pepper particles moved to the top of the liquid surface due to convection(Transfer of thermal energy).
Questions :
1. Discuss how the motion of the pepper particles related to the motion of the water.
2. Describe how the smoke particles moved when the candle was blown out.
3. Explain how the convection currents that you formed in this lab are similar to the convection currents on which hawks glide.
4. Form hypothesis that explains how the convection currents on which hawks glide form.
Explanation / Answer
Q.1 Pepper particles move upwards with less dense hot water but denser cold water will move downwards due to the convection currents.
Q.2. Smoke particles first move upwards and then move downwards forming some sort of closed loops due to convection currents.
Q.3. As the pepper particles rises up in the experiment similar kind of air convection set up the Hawk glide aloft in the air and make their ride.
Q.4. Sunlight heats the land due tpo which air molecules in contact with Earth's surface get heated up and become more energetic, colliding more with each other and spreading out. As the air molecules spread out, air becomes less dense and starts to rise through the denser surrounding air. This rise of less dense air is called convection and creates upward air currents that can keep objects aloft like hawks glides.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.