Element's abbreviation; first letter is capitalized and second letter (if it has one) is lowercase.
What is 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.
What is Atom
200
Chemical property that describes the likelihood and rate at which a substance undergoes a chemical reaction.
What is 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.
What is an 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.
What is a 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.
What is an 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