2.1.1 Elements, Compounds & Mixtures Flashcards
1
Q
What is an Element?
A
A Substance made of atoms that contains the same number of protons and cannot be split into anything simpler.
2
Q
How many Elements are there in the Periodic Table?
A
118
3
Q
What is a compound?
A
A pure substance made up of two or more elements chemically combined.
4
Q
How many compounds are there?
A
There is an unlimited number of compounds.
5
Q
Compounds can not be…
A
…separated into their elements by physical means.
6
Q
List two examples of compounds.
A
- Copper
- Sulfate
- Calcium carbonate
- carbon dioxide
7
Q
What is a mixture?
A
A combination of two or more substances (elements and/or compounds) that are NOT chemically combined.
8
Q
How can mixtures be separated?
A
By physical methods such as filtration and evaporation.
9
Q
List two of Mixtures
A
- Sand and Water
- Oil and Water
- Sulfur powder and Iron fillings
10
Q
All substances can be classified into…
A
Elements, compounds and/or mixtures
