Atoms/Elements
Define an atom
smallest form of matter
simple definition of an isotope
Same element, different number of neutrons
what makes an atom reactive
outer shell is not full
Chemical expression for water
H2O
is matter living? Can it be in living things?
No; yes
protons, neutrons, electrons
How many neutrons does carbon 12 have
6
rank three bonds from strongest to weakest
Covalent > Ionic > Hydrogen
Is water polar? Why?
yes; oxygens steal electrons
What is matter?
anything that takes up space
what are the charges of the proton, neutron, electron
+, -, neutral
How many protons does Carbon 67 have
6
What are ionic bonds versus covalent bonds
transfer of electrons; sharing of electrons
Cells are made up of how much water?
70-95%
what is organic chemistry?
study of carbon containing compounds
An unknown atom has the atomic number of 9 and 10 neutrons. Which atom is it?
Flourine
How many valence electrons does silicon have?
4
Cations ___ an electron, anions ___ an electron
lost, gained
Why are hydrogen bonds generally weak?
they do not share or transfer electrons
Living organisms are made up of 95%:
C, N, O, H
Define atomic weight
the average of all types of of the element based on the percentage it's found in
Define octet rule
A full outer shell of 8 electrons
What is the LEAST electronegative atom? If it was binded to Oxygen would it be polar or nonpolar?
Francium or Cs, it would be polar
draw water with arrows pointing toward the most electronegative atom; 30 seconds go
I'll explain
how many shells does neon have
2