An atom that has the same number if protons but different number of nuetrons.
What is an isotope?
100
Melting
When a solid changes to a liquid it is called?
100
A compound is made up of two or more elements that are chemically combined in a set ratio.
What is a compound?
100
Ithappens during viberates.
What happens during energy transformation?
100
Both are speculative (best guesses).
How is hypothesis and theory similar?
200
Elements in the same group are alike by the physical and chemical properties.
How are elements in the same group alike?
200
False
True or False? Liquids are easy to compress.
200
Water and Oxygen are examples of a compound.
What are two examples of a compound?
200
Energy Transformation is the process of changing any kind of energy into another.
What is energy transformation?
300
The valence electrons determines how the atom will react.
_______ electrons determine how an atom will react..
300
Sublimation
What is it called when a solid changes directly into a gas ?
300
A molecule is an atom that is chemically bonded together and a compound is a molecuke that contains a least two different elements. ALL COMPOUNDS ARE MOLECULES BUT NOT ALL MOLECULES ARE COMPOUNDS!!!!
What is the difference between a compund and a molecule?
300
Light Bulbs - Eletrical - Light (heat).
What are some everyday examples of energy transformation?
300
The theory of evolution, general relativity, quantum theory
What are some examples of a theory?
400
They are located on the left of the periodic table.
Where are alkali metals located?
400
True
True or False? Solids do not take the shape of the comtainer it is in..
400
A chemical combination of two or more elements.
When do compounds happen?
400
Thermal energy is lost during energy transformation.
What type of energy always lost during energy transformation?
400
A good hypothesis will provide direction for your project and will help to keep your investigate focused. A hypothesis is to be stated simply and concisely. It is critical for your project and must be testable.
What are some examples of a hypothesis?
500
A single atom because they generally have 8 valence electrons and have stable eletronic configuration.
Do noble gases exist as single atoms or molecules? why?
500
False
True or False? Plasma is not a state of matter.
500
A hypothesis is a guess in what you think it is a theory is a fact and someone already proved it in the past.