Properties and Changes of Matter
What is a compound?
composed of more than 1 type of atom
What does the atomic number represent?
It represents the number of PROTONS in an atom
What is a nucleus made out of?
Protons and neutrons
What's Periodic Law?
when elements are arranged in order of increasing atomic number, elements with similar properties appear at regular intervals.
Name a diatomic molecule.
Hydrogen, Nitrogen, Oxygen, Fluoride, Chlorine, Bromine, Iodine
What is a mixture?
contains 2 or more pure substances and can be separated by physical means
What are isotopes?
atoms of the same element with different numbers of neutrons.
What is radioactive decay?
What are the horizontal rows called?
periods
What are some of the properties of covalent bonds?
weaker attraction between atoms, often found as liquids/gases, and has low melting/boiling points.
density, conductivity, malleability, state of matter
The Plum Pudding model
What's a Half Life?
it's how long it takes for half of a radioactive sample to decay.
What are the S&P blocks called?
Representative elements
Can you add "mono" to the first word in the molecule?
NO
What is the Law of Conservation of Mass?
In a chemical reaction, the mass of the products is equal to the mass of the reactants.
Democritus in 400 BC
Determining age
What are the 3 classes of elements?
When naming a cation, what do add to the name?
How strong is the molecular force in a solid?
strong > little molecular movement
What are protons and neutrons made out of?
Quarks
Why do elements want to be like the noble gases?
They want to have a full valence electron shell.
What is the full name of P4O10?
Tetraphosphorus decoxide