Periodic Table
All matter is composed of these.
What are atoms?
This is the center of an atom that makes up its mass.
What is a nucleus?
In the reaction 2H₂ + O₂ → 2H₂O, the hydrogen and oxygen are these.
What are reactants?
Decomposition is the type of reaction where a substance does this.
What is break apart or break down?
This element is named after Niels Bohr.
What is Bohrium?
These columns on the periodic table can tell you the number of valence electrons per element.
What are groups?
This is the atomic number of oxygen.
What is 8?
When reactants break down and recombine as products, it is called this.
What is a chemical reaction?
2Na + Cl₂ → 2NaCl is an example of this type of reaction.
What is synthesis?
This is the theory that Isaac Newton developed.
What is the theory of gravity?
This group of elements is on the far right side of the periodic table and is known for being very stable (non-reactive).
What are the noble gases?
One of the three subatomic particles that has no significant mass and has a negative charge.
What is an electron?
A molecule that speeds up chemical reactions.
What is a catalyst?
The excess energy from this type of reaction is often released through heat.
What is exothermic?
What are the laws of motion?
The highly reactive elements in group one of the periodic table, excluding hydrogen, are referred to as these.
What are alkali metals?
Each period or row on the periodic table includes elements that have this in common.
What is the number of electron shells?
This law states that matter is never created nor destroyed.
The Law of Conservation of Mass
Photosynthesis is an example of this type of reaction.
What is endothermic?
Jane Goodall spent two years in Africa studying these.
What are apes/chimpanzees?
These are the three main types of elements on the periodic table.
What are metals, metalloids, and nonmetals?
This is the name for the electrons in the outermost shell of an atom that are involved in chemical reactions.
What are valence electrons?
In a closed system, the mass of reactants will be __________ the mass of products.
What is equal to/the same as?
This type of reaction is always exothermic.
What is Combustion?
This scientist is best known for formulating the Periodic Law and creating a better version of the periodic table of elements.
Who is Dmitri Mendeleev?