Biology: Unit 2

What charge does protons have

positive

where is a neutron found in an atom

inside the nucleus

the atomic number is always the same as what

number of protons

what charge does electrons have

negative

how many electrons fill the first shell surrounding the nucleus

2

when an atom gives away an electrons it becomes a _______

positive ion

how many protons can be found in an atom of oxygen

8

how many neutrons can be found in an atom of oxygen

8

how many electrons can be found in an atom of oxygen

8

the atomic mass is equal to ___+____

protons+neutrons

how do we find out how many neutrons are in an atoms

subtract number of protons from atomic manss

what happens to an element when the number of protons is changed

it changes the element

what is another name for a negative ion

anion

what is an element called that the number of neutrons has been changed and it exists in nature

Isotope

how can you tell if that an element is an isotope

the atomic mass is different

how many hydrogen atoms are in the following molecule C6H12O6

12

if atoms bond by sharing electrons it is called a _______ bond

covalent

a bond that is formed when a metal gives away an electrons to nonmetal

ionic

if atomic mass is protons + neutrons, why do you need to know the atomic number

it is equal to the number of protons

how many electrons would an atom love to have in its outermost shell (other than H and HE)

8

if an atom receives electrons from another atom it is an

Anion

which type of bond forms because opposites attract

ionic or hydrogen (either could work)

what type of bond is responsible for the properties of water

hydrogen

what property allows a water strider to walk across the top of water

surface tension

water is most dense as a _________

liquid

what property allows water to travel from the roots to leaves of a plant

capillary action

what property of water is shown when water attracts to other objects

adhesion

water is the universal solvent. What does this mean?

Water dissolves nutrients, minerals, & vitamins

unequal

polar

what term describes how water is resistant to changes in tempertaure

high specific heat

what property is shown when water attracts to itself

cohesion

water is useful in living organisms for _______

transporting substances and dissolving

what charge is the oxygen atom in a molecule of water

negative

what charge is the hydrogen atom in a molecule of water

positive

which elements will connect by a hydrogen bond when 2 water molecules come together

(+)hydrogen to (-) oxygen

which of the following is an affect of ice floating on a lake

the organisms

capillary action is

the combination of adhesion and cohesion to draw water up a tube