EXAM Flashcards
What is Chemistry?
The study of the structure and properties of different substances.
Who is a chemist?
A person who studies Chemistry
What is a chemical reaction?
When substances react together, they undergo a chemical change and form completely new substances.
How do we represent a chemical reaction?
Using a chemical equation or a word equation.
What is the arrangement of a solid?
Tightly packed in a regular arrangement.
What is the arrangement of a liquid?
Particles are close together and in an irregular arrangement.
What is the arrangement of a gas?
Particles are far apart and irregular.
How do atoms in a solid move?
They vibrate in fixed positions.
How do atoms in a liquid move?
They move over each other.
How do particles in a gas move?
They move freely and faster.
What’s the volume of a solid?
Fixed Volume.
What’s the volume of a liquid?
Fixed Liquid.
What’s the volume of a gas?
No fixed volume.
What’s the shape of a solid?
Definite shape.
What’s the shape of a liquid?
No fixed shape and takes the shape of the container.
What’s the shape of a gas?
No fixed shape and spread throughout the container.
What’s the compressibility of a solid?
Cannot be compressed.
What’s the force of attraction of solids?
Strong forces of attraction.
What’s the force of attraction for liquids?
Weaker forces of attraction.
What’s the force of attraction of gases?
No forces of attraction.
What’s the energy of solids?
Lower kinetic energy.
What’s the energy of liquids?
More energy than solids but less that gases.
What’s the energy for gases?
Greatest kinetic energy.
What’s solid to liquid?
Melting
What’s liquid to gas?
Vaporization.
What’s gas to liquid?
Condensation.
What’s liquid to solid?
Freezing.
What’s Solid to Gas?
Sublimation.
What’s gas to solid?
Reverse sublimation.
What’s the difference between boiling and evaporation?
Boiling happens at the boiling point only. At this temperature, all particles are able to convert from liquid to gas.
Evaporation happens over a range of temperatures and is a surface phenonomenon.
What is the Diffusion?
When particles move from a place of high concentration to a place of low concentration till the particles are evenly spread out.
In what substances does diffusion take place?
Liquids and Gases.
What is an element?
A substance containing only one type of atom.
What is a compound?
A chemical substance consisted of two or more elements chemically-bonded together.
What is a mixture?
Two or more substances that are physically mixed with each other and can be easily separated are called mixtures.
A compound is formed as a result of a…
Chemical Reaction.
The properties of a. compound are unique, therefore it is independant of the reactions.
What is a solute?
A soluble solid dissolved in a solvent.