In electron shells/clouds/rings on the outside of the nucleus.
100
How are elements arrange in the periodic table?
The elements are arrange in order of atomic number or number of protons.
100
What is the difference between a chemical and a physical change?
A physical change can be reversed and a chemical change cannot be reversed easily.
100
What is the simplest unit of matter?
An atom
100
What happens to the molecules of water when they change from a liquid state to a solid state?
The molecules of water slow down when it goes through a phase change from a liquid to a solid.
200
What are the three subatomic particle (small particles) that make up an atom?
Protons and Neutrons make up the nucleus of the atom and the electrons are found outside the nucleus.
200
What is the difference between a group and a period?
Groups form vertical columns and periods are horizontal rows.
200
What are three signs of a chemical change?
Color change,
Formation of a gas,
Temperature change, and
Formation of a precipitate
200
Why do atoms bond?
To become stable and have a full octet or 8 valence electrons.
200
A bowl of chocolate M&M's is an example of what type of mixture?
Heterogeneous Mixture
300
What are valence electrons?
Electrons located in the outer shell
300
What is the most reactive group of nonmetals?
The Halogens
300
Is the transition of a gas to a liquid a chemical or physical change?
physical
300
Covalent bonds are formed between what kind of elements?
Nonmetals
300
What is an isotope?
Provide one example of an isotope with your definition.
An isotope is an atom with a different number of neutrons then what appears on the periodic table.
Two examples of isotopes are Carbon14(used to determine the age of fossils) and Uranium238(used to determine the age of rocks)
400
What subatomic particle do we use to identify an atom?
Protons
400
Why are the Noble Gases considered stable?
Each element in the Noble gases has a full outer electron shell or have at least 8 valence electrons.
400
Give three physical properties
Conductivity,
Malleability,
Magnetism, and
Luster, Color, etc.
400
What kind of bond is formed when Na and Cl bond together to create table salt?
Ionic Bond
400
What term best describes the change in temperature during a chemical reaction that causes the products to become cold?
Endothermic Reaction
500
Draw a Lewis Dot Diagram of Carbon
Check with teacher
500
How many elements are on the periodic table?
118
500
What is the difference between a compound and a molecule?
All molecules are compounds, not all compounds are molecules.
500
What IS the law of conservation of matter?
Reactants and Products must balance
500
What happens when a strong base and a strong acid are mixed in equal proportions?
Both the strong base and the strong acid are neutralized.
The product of the reaction will have a more neutral pH than the reactants.