Chemistry Review - Quiz 3 Flashcards
What is Chemistry
Study of matter and its changes
What is Matter?
Anything that has mass and occupies space
What are Atoms?
Building block of matter.
Made of Protons, Neutrons, and Electrons
Protons
Positive Charge
Atomic # = # of Protons
Neutrons
Neutral Charge
1 amu
Electrons
Negative Charge
Ions
Atoms/groups of atoms bonded together with a net charge
Cations: +
Anions: -
What are compounds
More than one kind of atom in a fixed ratio by mass
Molecules
Groups of atoms bonded together by covalent bonds
Neutral Charge
Ionic Compounds
Has both + and - charged ions
Attracted by charge and are not molecules
Physical Change
No change in chemical makeup
EX: melting ice
Chemical Change
Always makes a chemically different substance
Ex: 2H2O –> 2H2 + O2
Physical Property
When you look at it and say what it is
Intensive: Color
Extensive: Size (Volume)
What are substances?
Pure materials that can’t be physically separated into simpler components
Chemical and Physical properties are uniform
Compound or Element
Mixtures
2 or More Pure Substaances
- Can separate mixture into simpler substances
Homogenous
Uniform in physical and chemical properties
EX: Normal saline
Heterogenous
Distinct phase boundaries where chemical and/or physical properties change
Ex: Vomit
Where are protons and neutrons located?
Nucleus
Where are electrons located
Around the nucleus in cloud-like orbitals
What has wave-like properties rather than geometric properties?
Atomic Structures
All atoms have neutrons except for ?
Hydrogen
What determines the atom’s identity?
The Atomic Number = # of Protons
