Unit 1 - Explaining Physical Changes 1 Flashcards
Particles
The smallest pieces of matter
Intermolecular forces
The forces between particles in matter
Malleable
Able to be bent without breaking
Strength
The ability of a solid to withstand a force
Hardness
A measure of how easy it is to scratch a solid
Soluble
Able to dissolve in a solvent
Conduct
Transfer of heat or electrical charge by passing on energy to nearby particles
Alloy
Mixtures of metals
Hypothesis
An idea that explains facts or observations and is the basis for experimentation (X depends on Y)
Brownian motion
Movement of solid particles caused by collisions with liquid particles
Kinetic theory
Theory that all matter is made up of particles
Evidence
Information gathered in a scientific way which supports or contradicts a conclusion
Viscosity
The ability of liquids and gases to flow
Compressed
When particles are squashed together by a force
Solubility
The mass of solute that dissolves in a solvent at a particular temperature
Sublimation
When a solid turns straight into a gas without a liquid state
Melting point
The temperature at which a solid changes state to a liquid
Boiling point
The temperature at which liquid changes state to a gas
Latent heat
The heat energy needed to change the state of a substance
Evaporation
Change from a liquid to a gas a t the surface of a liquid
Boiling
When a liquid changes state into a gas
Surface area
The area of the outside surface of an object
Thermal expansion
When particles in a solid or a liquid gain enough energy to occupy more space
Atom
The basic building block of an element that cannot be chemically broken down
Element
A substance made up of only one type of atom
Compound
Two or more elements that are chemically joined together such as water (Hydrogen + Oxygen)
Particle model
Used to explain the kinetic theory of solids, liquids and gases
