Elements & Compounds Flashcards
(27 cards)
What is the definition of an element?
A substance that is made up of only one type of atom.
How many discovered elements are there on the Periodic Table?
118
An atom is the smallest ___________ of __________.
An atom is the smallest unit of matter.
What is H?
Hydrogen
What is N?
Nitrogen
What is S?
Sulphur
What is O?
Oxygen
What is C?
Carbon
What is Co?
Cobalt
Where do most symbols for elements come from?
Latin
All substances are made up of what?
Particles
What is the simplest type of particle?
Atom
All matter is made from what?
Elements
As there are 118 discovered elements in the universe, how many discovered atoms are there in the universe?
118
The Periodic Table has all of the known chemical elements listed arranged to their what?
Chemical properties
Each element is represented by its own what?
Symbol
The two main categories of the Periodic Table are what?
Metal and non-metals
What is the difference between the physical properties and the chemical properties of a substance?
Physical properties - characteristics that can be observed all measured without changing the substances chemical identity. Examples include colour, odour, state of matter, solubility, density and hardness
Chemical properties - how are substance interact with other substances; involve a changing chemical identity. Examples include flammability, reactivity with acids and bases, ability to rust (oxidation), combustion and decomposition
When atoms of different elements combine in a chemical reaction, a new substance is formed. What is this substance called?
A compound
What is the definition of a compound?
Two or more elements chemically bonded together
When a chemical reaction occurs, what is always made?
A new substance
What are three different observations that give evidence that a chemical reaction has taken place?
- colour change
- mass change
- temperature change
What is a product?
The result of a chemical reaction.
What is a reactant?
The starting substance of a chemical reaction.
