Elements,compounds&mixtures Flashcards
1
Q
what is an element
A
A substance made up of atoms that all have the same number of protons in their nucleus
2
Q
what is a compound
A
it contains two or more different elements that are chemically combined
3
Q
what is a mixture
A
where you have different elements that are not chemically combined
4
Q
how is carbon dioxide a compound
A
because it formed a chemical reaction between carbon and oxygen.
5
Q
what does mixtures not have
A
a chemical bond
6
Q
give two examples of a mixture
A
air and crude oil
7
Q
what is one method of separating substances in a mixture
A
chromatography
8
Q
True or false? Atoms are the smallest part of an element that can exist
A
True
9
Q
Ammonia is a compound with the formula NH3, why is it classified as a compound
A
Because it contains two elements held together by chemical bonds
