UNIT 2.2

Frage	Antworten
1. Why are the models used in science?	To test or explain something difficult to understand.
2. What is analogy?	To compare a common everyday thing to a complex thing so we understand it.
3. Give an example of analogy?	Comparing a pump to a heart and how they act the same way.
4. What are thought models and how do scientists use them?	They help scientists imagine objects and events that are difficult to understand.
5. What is the difference between good and bad thought models?	Good thought models are supported by lots of scientific observation and evidence and bad one does not have real scientist.
6. What is a particle model?	It explains the properties of substances.
7. What is everything made of in the particle model?	Incredibly small, hard balls called particles.
8. What are bonds?	Forces of attraction that hold particles together from either solid or liquid.
9. What do particles in solid do?	They vibrate but stay in their spot.
10. What happens when you increase the temperature in solid?	This gives the particles more energy and so they vibrate more.
11. What is indirect evidence?	Facts and evidence from which something else can be inferred.
12. What is diffusion?	A process in which two liquids or gases mix.
13.What is Brownian motion?	A random motion of particles caused by being bumped or jostled by each other.
14.What are thought models helpful for?	Thought models are helpful when you are trying to understand incredibly tiny things and what they do.
15. Give an example on how a model can be used.	A model can be used to test how a building withstands an earthquake.
16. What dot points does a particle model have?	1. All substances are made up of tiny particles 2.Particles always have energy and move 3. Particles move faster when temperature is increased 4. The closer the particles the stronger the bond
17. Explain the particles in a solid.	The particles in a solid are closely packed in a fixed position and they also vibrate.
18. Explain the particles in a liquid.	In a liquid the particles are still closely packed together but they are far more loosely bonded.
19. Explain the particles in a gas.	The particles in a gas are spread far apart and have no bonds holding then together.
20. What happens when a substance is cooled?	When a substance is cooled energy is removed from it's particles making them vibrate less and less.

Nächster

Beschreibung

Zusammenfassung der Ressource

ähnlicher Inhalt

	Erstellt von Assged Abdalla vor mehr als 7 Jahre