Chemical And Physical Changes 1st Unit Test Flashcards
(23 cards)
5 points of the particle theory
- all matter us made up of particles
- there is space between particles
- all particles in a pure substance are the same
- the particles are always in matter are always in motion
- particles are attracted to eachother
Whats can a heterogeneous mixture also be called
Mechanical mixture
What type of mixture can the diffreng oarts be seen in?
Heterogeneous mixture
What is another word for homogeneous mixture
Solution
What type of mixture can you NOT see the different parts separately?
Homogeneous mixture
What is the simplest form of matter?
A atom
What is a particle made up of two or more atoms boned togther called?
Molecule
What is the particle theory?
Explains how all mattet is structured and how it behaves under certain circumstances
What 2 thibsg define a pure substance
- made up of only one particle
- cannot be separated by physical means
What is matter?
Anything with mass and volume
What 2 things define mixtures
- 2 or more pure substances
- can be physically separated
What are the two types of mixtures
Homogeneous & heterogeneous
2 things that define a heterogeneous mixture
- particles are not uniformly scattered
- can see the different particles
- ex:pizza, italien dressing
What are physical properties that can be observed with senses
- colour
- odour
- texture
- lustre
- clarity
- taste
What does solubility mean
Ability of a liquid to dissolve
What does viscosity mean
How easily a lqiuid flows
What does ductility mean
Can be pulled into long thin wires
What is melting and boiling point
Temperature at which a substance changes state
What are physical properties taht can be described with test and measurements
- state
- hardness
- malleability
- ductility
- melting and boilinh point
- solubility
- density
What are 3 chemical properties
- combustibility
- reactivity
- sensitivity to light
Examples of physical changes
- melting
- boiling
- freezing
- condensation
- sublimation
- dissolving
Examples of chemical changes
- burning
- cooking
- rusting
5 Ways to know if a chemical change has taken place
- a new colour
- heat or light is released
- bubbles of gas are formwd
- a solid forms
- the change is difficult to reverse
