1.3 - Compounds, Molecules & Mixtures Flashcards
(12 cards)
True or false? Something counts as a ‘molecule’ when it’s made from 2 or more atoms, and those atoms are held together by chemical bonds.
True
A molecule is defined by the presence of 2 or more atoms bonded together.
Does O2 count as a molecule?
Yes
O2 consists of 2 oxygen atoms covalently bonded together.
Which of the following are molecules? (Select all that apply) He, Cl2, O2, N2
Cl2, O2, N2
He is a single atom and does not qualify as a molecule.
A compound is a substance made from ____ or more different ______ that are chemically _______ together.
two, elements, bonded
Compounds consist of different elements chemically combined.
Why is oxygen a molecule?
It consists of 2 bonded oxygen atoms
Oxygen (O2) is a diatomic molecule.
Is carbon dioxide (CO2) a molecule, a compound, or both?
Both
CO2 is made from carbon and oxygen, fulfilling the definitions of both.
How many oxygen atoms are there in 1 molecule of H2SO4?
4
H2SO4 contains two hydrogen atoms, one sulfur atom, and four oxygen atoms.
What is the definition of a mixture?
A combination of two or more substances that are not chemically bonded
Mixtures can be separated by physical means.
Is the air all around us a compound or a mixture?
A mixture
Air consists of various gases, including nitrogen, oxygen, and others, not chemically bonded.
Is seawater a compound or a mixture?
A mixture
Seawater contains water and various dissolved salts and minerals.
What is a compound
2 or more different elements held together by chemical bonds
What is a molecule
2 or more atoms held together by chemical bonds
