Study sets, textbooks, questions
Upgrade to remove ads
Chapter 18 Physical Science
Terms in this set (53)
pure substance made up of only one kind of atom
smallest particle of an element (proton, neutron or electron)
non-chemical combination of two or more substances
pure substance of two or more atoms or elements bonded together in a fixed ratio
distinct particle formed when two or more atoms are covalently bonded together
atoms are unstable if not bonded together
- atoms are most stable when they have a full valence shell
chemical bond formed between two atoms, each sharing one valence electron
occurs when atoms of two elements form oppositely charged ions that are electrically attracted to each other
charged particle when an atom (molecule) gains or loses electrons
Electron Dot Notation
notation system to show the arrangement of valence electrons
electron dot structure is rotated to align unpaired/single electrons to show covalent bonds. can use dashes & leave out previously paired electrons
molecules made up of only two atoms
molecule made up of three or more atoms
Electron Dot Structure
indicates how many covalent bonds an atom can have
measure of how well an in-bonded atom attracts & holds electrons
measure of an atoms ability to attract & hold electrons when bonded to other atoms
property of having concentrations of positive or negative charge (or partial charge)
Polar Covalent Bond
covalent bond between two atoms of different elements where the pair of bonding elements are NOT shared equally
if the electronegativity = 0
Polar Covalent Bond
if 0< EN < 1.7
if the electronegativity is greater than or equal to 1.7
forces that attract/repel molecules with other molecules
attraction between polar molecules that have H-F, H-N OR H-O covalent bonds
polar molecules excluding (h-bonds)
Vander Waals Forces
very weak intermolecular forces between non-polar molecules
an atom with the lower electronegativity loses an electron & becomes a positive ion
an atom with a higher electronegativity will "steal" an electron & becomes a negative ion
the two ions have a strong attraction that hold them tightly together
atoms held together by Ionic Bonds form
Ionic Formula Unit
if given/calculated the ionic charges-->criss cross them to get formula
What does the Ionic Compound Structure of a Crystal Lattice depend on?
1) size of Ions
2) ratio of atoms in formula unit
What are properties of Ionic Compounds?
-high melting points
-high boiling points
substance that produces ions when dissolved in H2O: conducts electricty
What is a covalent bond?
a chemical bond between two atoms, sharing a pair of valence electrons
How does a covalent bond hold atoms together?
electrons are the stand between two atoms to create a negatively charged region, negative attracts positive
What does the formation of an ionic bond involve?
the transfer of electrons
When two atoms of the same non-metal react, they become?
What happens in a polar covalent bond?
electrons are NOT shared equally
How is an electron dot diagram useful for focusing on the chemical property of an element?
shows the bonding sites, single unpaired electrons
Why does water have a high boiling point?
strong attraction between molecules=hydrogen bonds
In electron dot notation representation, each dot represents?q
When do polar covalent bonds form?
when covalent bonds aren't shared equally
2 atoms with nearly full outer orbitals can bond because of?
the shared electrons
T/F: elements with nearly full valence shells have a high electronegativity
T/F: covalent bonds are the most common with non metals
T/F: diatomic oxygen contains two pairs of bonding electrons
T/F: unpaired electrons share bonding sites for covalent bonds
T/F: both bond type & bond string are determined bye electronegativity
T/F: ions may gain or lose more than 1 electron to form ionic bonds
what do M cells in Peyer's patches do
what type of drugs are steroids?
What was the value of the Buffalo to Native Americans?
Discuss the way Tub is presented in the opening scene. Does your assessment of his character change in this later scene?
Sets found in the same folder
Physical Science Final
Physics Chapter 2 Test
Ch. 6 (BJU: Physical Science, 5th edition)
Physical science 3c section review
Sets with similar terms
Bonds Chapter 22 aka 4
Chap 8 Molecular Compounds
Chapter 12 Chemical Bonding
Other sets by this creator
Bio 150 Final Exam
Psych 240 3/3
Psych 240: Sex Differences & Sex-Role Development
Psych 240: Social Cognition
Other Quizlet sets
NCLEX Quiz 3 Questions
EASTERN EUROPE TEST
Biology Test 2 Final Exam Review
Muscles of the Shoulder