Structure of Atoms
Anything that has mass and takes up space.
What is Matter?
Symbols and subscripts used to represent a substance
What is a chemical formula?
Characteristic that helps to define or classify a substance
What is chemical property?
Process by which the atoms of an original substance rearrange to produce a new substance(s)
What is chemical reaction?
Smallest complete part (building block) of matter.
What is Atom?
Number at lower right of element's symbol in a formula; shows number of atoms for each element
What is a subscript?
Can be observed without changing the substance into a different substance
What is physical property?
Balanced or Unbalanced:
Al + 2HCl → AlCl3 + H2
What is unbalanced?
Substance made of only one kind of atom.
What is an element?
What information on the periodic table tells you about the reactivity of an element?
What is location/position?
H20
What is water?
Observed when a substance changes into a different substance
What is a chemical change?
C6H12O6 +6 O2 ——>6 CO2+ 6 H2O
What is cellular respiration?
Central part of an atom; contains most of its mass.
What is a nucleus?
Number of protons that an element has
What is atomic number?
Molecule made of two or more elements in a specific ratio
What is a compound?
In the human digestive system, chewing food into smaller pieces is a ________ change?
What is a physical change?
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)?
This describes the positive, neutral, or negative status of a specific atom.
What is Charge?
Determines the identity of an element; this number also equals the number of electrons in a neutral atom
What is atomic number?
6CO2 + 6H2O → C6H12O6 + 6O2
What is photosynthesis?
Changing food's carbohydrates into simple sugars is a _____ change
What is chemical?
Balanced or Unbalanced
3Ca + 2P = Ca3P2
What is Balanced?