Atoms
Periodic Table
Elements
Chemical/Physical Changes
Chemical Reactions
100
Three
How many subatomic particles does an atom have?
100
Dmitri Mendeleev
Who created the first organized periodic table back in 1869?
100
Atom
What is simplest unit of an element?
100
Solid ice is melted into liquid water.
What is a physical change?
100
Mass cannot be created or destroyed
What is the law of conservation of mass?
200
Subatomic particle with a positive charge
What is a proton?
200
In order of their atomic weights
How Dmitri Mendeleev's first periodic table was organized
200
more than 100
How many elements are listed on the periodic table?
200
A change that can be easily be reversed
What is a physical change?
200
The substances that exist before the reaction begins
What is reactant?
300
electron
What is the negatively charged subatomic particle called?
300
By increasing atomic number
How is the modern periodic table arranged?
300
Group 1 - Alkali Metals
What group is the most chemically active metals?
300
malleability and ductility
What are physical properties that make metals suitable for use in electrical wiring?
300
Our bodies breakdown food using chemical reactions.
What is respiration?
400
Atomic number
What is the number of protons in the nucleus of an atom?
400
Groups
What are the columns on the periodic table called?
400
the least reactive of all elemens
What is Group 18 - the Noble Gases?
400
A property that stays the same during physical and chemical changes
What is mass?
400
It speeds up a reaction.
What is a catalyst?
500
Subatomic particle that orbits the nucleus
What is the electron?
500
Periods
What are the horizontal rows on the periodic table called?
500
Silicone
What element is the basis for semiconductors in computers?
500
A new substance is formed with different properties than the original substance
What is a chemical change?
500
Signs of a chemical reaction
What are temperature change, color change, gas formation, and formation of a precipitate
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