Term 1.3 Flashcards
What is the particle theory of matter >
The particle theory of matter states that
- all matter is made form atoms
- -atoms are attracted to each other
- atoms can not be squished or sqaushed
- diffrent particles have diffrent properties
- particles are constantly in motion
What is physical change ?
The physical properties or state may change but no new substance is formed from the product of a chemical reaction
What is chemical change
A new substance is formed as a product of a chemical reaction ?
How can you identify that a chemical reaction has occured ?
- a change in colour or temp
- a gas is produced
- a new solid is formed (precipitate)
- energy is released or absorbed (heat and light )
What does exothermic mean ?
A chemical change that produces energy
What does endothermic mean
A chemical change that absorbs energy
What is matter made up of
Matter is anything that occupies space and has mass. Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules
4 signs of physical change
1.Texture,
2.shape,
3.temperature
4.change in the state of matter.
A gas to solid is called ?
deposation
A solid to a gas is called ?
sublimation
