Matter Flashcards
What is matter made of?
Atoms
Atoms are composed of protons, neutrons, and electrons.
What are the charges of protons, neutrons, and electrons?
Protons: Positive, Neutrons: Neutral, Electrons: Negative
This defines the basic charges of subatomic particles.
What is the charge of the nucleus of an atom?
Positive
The nucleus contains protons and neutrons.
What is the overall charge of a neutral atom?
Neutral
The number of protons equals the number of electrons in a neutral atom.
What defines a pure element or compound?
Contains only one substance with no other substances mixed in
This distinguishes pure substances from mixtures.
What are impure materials?
Mixtures of elements, mixtures of compounds, or mixtures of elements and compounds
Impure materials contain more than one type of substance.
What is a compound?
Contains atoms of two or more different elements, chemically joined together
Compounds are formed through chemical reactions.
How are compounds formed?
In chemical reactions
Compounds can only be separated into their elements through additional chemical reactions.
What is the result of the reaction between Iron and Sulfur?
Iron sulfide
This is an example of a compound formed from its elements.
What are the components of atomic mass/weight?
Protons and neutrons
Electrons contribute negligibly to atomic mass.
What is the atomic number?
Number of protons in an atom
The atomic number uniquely identifies an element.
In terms of atomic mass, which number is always bigger?
Mass number
The mass number is the sum of protons and neutrons.
Fill in the blank: A _______ contains atoms of two or more different elements, chemically joined together.
compound
