Chemical Change/Property vs Physical Change/Property
Define physical change.
A change that affects one or more physical properties of a substance without altering its chemical composition.
What is the charge of a proton?
Positive (+1)
What is the element with the symbol Cl?
Chlorine
What is an anion?
A negatively charged ion
What is a covalent bond?
A bond formed when two atoms share electrons.
What is an example of a chemical change you observed in class?
combining vinegar and baking soda to form a gas
What are electrons?
Negatively charged particles that orbit the nucleus.
What is the atomic number of lead
82
Name one real-world example of a chemical change.
photosynthesis, digestion, ect.
What are the rows on the periodic table called?
Periods
What are the physical properties of nonmetals
Poor conductors of heat and electricity, brittle in solid form, and often gases at room temperature.
What is the name of the particle with no charge?
Neutron
What element has 3 protons?
Lithium
What is an electron-dot diagram?
A visual representation of the valence electrons in an atom
What are the groups on the periodic table called?
Columns or families
List four examples of chemical changes
Burning, rusting, cooking, and fermentation
Where are electrons located
the electron cloud
What is the atomic mass of Iron
What is a valence electron?
an electron that sits in the outermost shell of an atom, meaning it's the furthest away from the nucleus, and these are the electrons that are most involved in forming bonds with other atoms
What does the atomic number represent?
Number of protons
What are four examples of physical changes?
Melting, freezing, dissolving, and chopping
What particles are found in the nucleus?
Protons and neutrons.
What is the symbol for gold
Au
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed in a chemical reaction.
When an atom loses electrons it becomes a (hint cation/anion)
Cation