chem 1&2 term quiz

all living things are based

on atoms and their interactions

chemicals make up _______ and ______

organism bodies and physical environment

Organism are..

composed of matter

how many element are there

91

of all 91 elements how many are found in organisms

25

the nucleus contains

neutrons and protons

what is formed from the nucleus

electron cloud

what does the electron cloud contain

electrons

an atoms has what type of charge

neutral/ no charge

when is a atom most stable

when the valence shell is filled with the max number of electrons

what is the variation in neutrons called

isotopes

atoms of _____ differ in the number of ____

different elements, protons

to fill a atoms outer electron shell they

donate receive or share electrons

the result of attraction between atoms is called

chemical bonds

when do ions form

when atoms gain or lose electrons

when a electron is gained what charge does the atom have

negative

atoms share pairs of electrons in what bond

covalent bond

the necleus for each atom will

attract the shared electrons

depending on wether the attraction of shared electrons is equal or unequally what can they be identify as

polar and non polar molecules

equal share of electrons

non polar

unequal share of electrons

polar

H20 is what type of molecule

polar

where is a hydrogen bond often found

in H, O and N

High specific heat

causes water to resist changes in temperature