Structure of Atoms
Identity/Property of Elements
Chemical Formulas
Properties/Changes
Chemical Reactions
100

Anthing that has mass and takes up space.

Matter

100

Element's abbreviation; first letter is capitalized and second letter (if it has one) is lowercase.

chemical symbol?

100
Symbols and subscripts used to represent a substance
What is a chemical formula
100
Characteristic that helps to define or classify a substance
What is property
100
Process by which the atoms of an original substance rearrange to produce a new substance(s)
What is chemical reaction
200

Smallest complete part (building block) of matter.

Atom

200

Chemical property that describes the likelihood and rate at which a substance undergoes a chemical reaction.

Reactivity

200
Number at lower right of element's symbol in a formula; shows number of atoms for each element
What is a subscript
200
Can be observed without changing the substance into a different substance
What is physical
200
Reactions that cause heat
What is exothermic
300

Substance made of only one kind of atom.

element

300
Outermost electrons in the electron cloud; an element's valence electrons determin its chemical properties
What is Valence Electrons
300
Substance made of two or more atoms
What is a molecule
300
Observed when a substance changes into a different substance
What is a chemical change
300
Reactions that absorb heat
What is endothermic
400

Central part of an atom; contains most of its mass.

nucleus

400
Number of protons that an element has
What is atomic number
400
Molecule made of two or more elements
What is a compound
400
In the human digestive system, chewing food into smaller pieces is a ________ change?
What is a physical change
400
color change, temperature change, gas formation, or precipitate (solid) formation is often observed when a new substance(s) is formed during a chemical reaction
What is evidence of a chemical reaction
500

Part of an atom surrounding the nucleus; consists mostly of empty space in which electrons move.

electron cloud

500
Determines the identity of an element; this number also equals the number of electrons in a neautral atom
What is atomic number
500
Compound that includes carbon along with the element(s) hydrogen, oxygen, nitrogen, phosphorus, and/or sulfur
What is an organic compound
500
Changing food's carbohydrates into simple sugars is a _____ change
What is chemical
500
New substances has different properties from the original substance
What is chemical reaction
M
e
n
u