1.3 Compounds, Molecules & Mixtures Flashcards
What is a compound?
A compound is a substance formed from two or more elements that have been chemically bonded together
What is a mixture?
A mixture is a group of different elements or compounds which are not chemically bonded together
What is a molecule?
A molecule is a substance that contains two or more atoms held together by chemical bonds
Do compounds have the same properties as the atoms they’re made from?
No, they have different properties
True or False? Something counts as a ‘molecule’ when its made from two or more atoms, and those atoms are held together by chemical bonds.
True
O2 consists of 2 oxygen atoms, covalently bonded together. Does oxygen count as a molecule?
Yes
Which one of these is not a molecule?
Cl2 He N2 O2
He
A compound is a substance made from _______ or more different ________ that are chemically ________ together.
Two, elements, bonded
Oxygen molecules (O2) consist of two oxygen atoms, is an oxygen molecule a compound?
No
Is carbon dioxide (CO2) a molecule, a compound, or both?
Both
How many oxygen atoms are there in 1 molecule of H2SO4?
4
Is the air all around us a compound or a mixture?
Mixture
Is seawater a compound or a mixture?
Mixture
