Chapter 7 Flashcards
What is a molecule?
two or more atoms of the same or different elements that are chemically joined together in a unit
What is a chemical formula?
notation that indicates the type of number of atoms in a pure substance
What is a molecular element?
a molecule consisting of atoms of the same element
What is a molecular compound?
a molecule that consists of two or more different elements
( H2O , CO2 )
What is a ion?
a particle that either has a positive or a negative charge
When does an ion form?
When an atom loses or gains one or more electrons without changing it’s # of protons
What are two different types of ions?
cation & anion
What type of ion is a cation?
positively charged ion
What type of ion is a anion?
negatively charged ion
what is a ionic compound?
a compound that consists of negatively and positively charged ions
What is another word for sodium chloride?
Table salt
- due to ions of sodium and chloride being oppositely charged, attracting eachother *
What is the name for atoms joining with other atoms to form a larger unit?
Molecules
Molecules that contain the same elements are called…
Molecular elements
Can molecules contain atoms of different elements and atoms of the same elements?
Yes they can!
Molecules that contain atoms of different elements are called…
molecular compounds
What indicates the type and number of atoms in a pure substance
a chemical formula
some compounds which contain charged atoms called ions are called..
ionic compounds
What are diatomic molecules?
pure elements that form molecules consisting of two atoms bonded together
What are the seven diatomic molecules?
H2, N2, O2, F2, Cl2, Br2, I2
Atoms combine to become more ____
stable
What are the most stable elements in the periodic table?
noble gases
- have the maximum # of electrons in their outermost orbit
How are alloys created?
created by melting two or more metals then mixing these hot liquids.
How are alloys different from compounds?
in compounds join chemically to form pure substances
alloys are solutions of metals - metals don’t combine chemically
Do metals lose electrons becoming cations?
Yes!
