Chemistry
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
What is matter?
Anything that occupies space and has mass (air, water, trees)
What is particle theory?
• All matter is made of tiny particles • Different pure substances are made up of different types of particles • Particles are always in constant, random motion • The particles in a substance attract each other, the amount of attraction differs depending on the distance between the particles or state of matter 5. Particles move faster when heated
What happens when a solid melts to a liquid?
When heat is added the particles vibrate faster until the particles are moving fast enough to change position
What happens when a liquid freezes to a solid
As the temp drops the particles loose energy and move slowly, eventually they settle into fixed positions
What happens when a liquid evaporates to a gas
When heated the particles move faster, eventually they have enough energy to overcome forces attracting them
What appends when a gas changes to a liquid
As the temp drops the particles loose energy and move slower eventually it comes so slow it changes into a liquid
What does an atom look like
Represented by a single sphere
What does a molecule look like
Represented by two or more spheres joined together
What do molecules of elements look like
Represented by two or more sphere of the same size and colour joined together
What do molecules of compounds look like
Represented by two or more spheres of different sizes and colours joined together
What is a pure substance
Contains only one kind of particle
What is emulsions
A type of colloid where tiny drops of liquid are in another liquid
What is a colloid
Mixture where solids or drops of liquid are suspended but they are so small they do not settle out
What is density
How much mass an object contains
What are physical properties
Description of substance made without chemically changing
What are chemical properties
How the substance chemicals reacts with another substance
What are quantitative properties
Characteristics that are measured
What are qualitative properties
Descriptions made without measurement
What is a physical change
A change in which no new substance is produced
What is a chemical change
A new, chemically different substance is produced
What is an element
Composed of only one type of atom
What is a compound
Composed of two or more different types of atoms bonded together into molecules
What is a non-metal
An element that does not have properties of a metal
What is a metal
An element with metal properties