Show:
Atomic Structure, Models, and Theory
Periodic Table and Trends
Chemical Bonding, Structures, and Names
Stoichiometry
Chemical Reactions
100
atom
Democtritus coined what term for a tiny piece of matter that cannot be divided?
100
True
Metalloids are the smallest category on the periodic table. True or False?
100
False
Stealing electrons is an example of a covalent. True or False?
100
grams
Mass is measured in what units?
100
It does not create a new substance, the pieces are still paper
When paper is torn, it is a physical change because why?
200
subtract atomic number from mass number
To find the number of neutrons in an tom, you would do what?
200
On either side of the zigzag line
Where are the metalloids on the table?
200
full octet
Most atoms strive for ____.
200
stoichiometry
What is the name given to the proportional relationship between two or more substances during a chemical reaction?
200
chemical
Mixing vinegar and baking soda is an example of what type of reaction?
300
the electron gains energy
What happens when an electron moves to a higher energy level?
300
the chemical symbol
The one or two letter symbol for each element is called what?
300
outer
valence electrons are electrons in the _____ energy level.
300
chemical reaction
Limiting reactant is the name given to the substance that controls the quantity of product that can form in a _____.
300
Color, temperature, or state of matter
During a chemical reaction there can be an unexpected change in ________?
400
Dalton
Which scientist concluded that all the atoms of a single element have the same mass?
400
Gases
All of Group 18 are classified as what?
400
hydrogen and helium
What are the two elements that can only hold 2 electrons in their outer energy level?
400
excess
_______ reactant is the name given to the substance that is not used up completely in a chemical reaction.
400
False
Rust is a physical change. True or False?
500
number of protons
What is unique for any given element?
500
non-metals
Hydrogen, Helium, Neon, and Oxygen are all _____.
500
covalent
When a nonmetal bonds with another nonmetal it creates a ______.
500
moles/moles
A mole ratio always has the ratio of what units?
500
physical change
What is breaking a glass an example of?