ATOMS
Which subatomic particle determines the element?
The proton
Matter is divided into two forms. What are they?
Pure substances and Mixtures
How many elements are there?
118
A characteristic that can be observed without changing the substance
Physical property
Substances that react to form a new substance
The central part of an atom that contains its mass
Nucleus
A pure substance made of all the same type of molecule.
Compound
What are the vertical columns of the periodic table called and what do they tell us?
Groups or Families; how many valence electrons?
Answers will vary: change of state, tearing, shredding, etc.
The substance(s) created as a result of a chemical reaction.
Products
Positively charged particles in the nucleus
Protons
A pure substance made of all the same type of atom.
element
What are the horizontal rows called and what do they tell us?
Periods; energy levels
Chemical property
The large number that tells how many molecules there are in a reaction.
Coefficient
Negatively charged particles surrounding the nucleus
Electrons
Combination of different substances not CHEMICALLY bonded.
mixture
Which group is the most reactive metals?
Group 1 Alkali Metals
Answers will vary: cooking an egg, baking a cake, iron rusting, silver tarnishing, photosynthesis, digestion, a candle burning, wood burning
The small number on the bottom right of an atom that tells how many atoms of that element are present
Subscript
What two particles determine the element's atomic mass?
Protons and Neutrons
Name the two types of mixtures
Homogeneous and Heterogeneous
Which group is the most reactive NONmetals?
Group 7 the Halogens.
Name 3 signs that a chemical reaction is taking place
odor, color change, unexpected temperature change, precipitate formed, gas released (fizzing, bubbles), sound
How many total atoms in Na3(CO2)4
Na = 3
C = 4
O = 8
Total = 15