lab safety
what kind of shoes are to be worn while doing a lab?
close-toed shoes
Where are most of the radioactive elements located on the periodic table?
bottom row
What did Mendeleev contribute to chemistry?
the periodic table
Chemical reaction where one element replaces another element in a compound
single replacement reaction
Device that detects and measures ionizing radiation
Geiger counters
Where should flammable materials never be used?
near an open flame
right side of the periodic table
What determines how reactive an element is?
valence electrons
Chemical reaction where acid reacts with a base to form salt and water.
acid/base reaction
what was created long before the Earth existed?
Uranium
How should you pick up a piece of heated glass?
what is the number in the top right corner of the element?
atomic number
what is the oldest and most abundant element on the periodic table?
hydrogen
Chemical reaction where 2 compounds exchange ions, forming 2 new compounds
double replacement reaction
American physicist best known for being the scientific director of the Manhattan project. And created the atomic bond.
Rober Oppenheimer
Why do we need a list of lab safety guidelines?
to prevent accidents and injuries, make sure all equipment is used properly, and to know what to do in case of an emergency.
what is the number under the element symbol?
atomic mass
What do elements in the same period have in common?
same number of electron shells
Chemical reaction in which a fuel reacts with oxygen and releases heat and light.
combustion reaction
What is created in a supernova explosion?
The building blocks of planets, life, and future stars
What are some things not allowed in the lab?
food/drinks
on the periodic table what goes up and down?
groups
Says that atoms are most stable when they have 8 electrons in their outermost energy level
octet rules
2 or more simple substances combine to form one more complex product.
synthesis reaction
What happens when a star runs low on hydrogen fuel?
When a star runs low on hydrogen fuel, its core collapses, fusion shifts outward, and the star swells into a red giant as it begins the next stage of its life cycle.