chapter 2 biology test

Question 1

A substance that cannot be broken down into anything else

Answer 1

Element

Question 2

Composed of two or more elements that are chemically combined (not a mixture)

Answer 2

Compound

Question 3

Protons + neutrons

Answer 3

Atomic mass

Question 4

____ of an atom have a different number of neutrons which vary their atomic mass

Answer 4

Isotopes

Question 5

____ elements have a full outer shell so they don’t react with other elements

Answer 5

Inert

Question 6

The atoms boned by and ionic bind are called a __________

Answer 6

Formula unit

Question 7

____ bonds form when electrons are shared between two elements

Answer 7

Covalent

Question 8

Two or more atoms held together by covalent bonds

Answer 8

Molecule

Question 9

Covalent bonds are _____ than ionic bonds

Answer 9

Stronger

Question 10

An atoms attraction for electrons

Answer 10

Electronegativity

Question 11

_____ covalent bonds form when there is an unequal sharing of electrons

Answer 11

Polar

Question 12

Covalent bonds have an equal sharing of electrons between two atoms of the same elements

Answer 12

Non polar

Question 13

Weak attraction between polar molecules (usually water)

Answer 13

Hydrogen bonds

Question 14

Acids have a pH ____ than 7

Answer 14

Less

Question 15

Bases have a pH _____ 7

Answer 15

Above

Question 16

_____ allows water molecules to form hydrogen bonds with each other

Answer 16

Polarity

Question 17

The properties of wanted help it support ____

Answer 17

Life

Question 18

Hydrogen bonds hold water molecules together

Answer 18

Cohesion

Question 19

Attraction between water and other polar substances

Answer 19

Adhesión

Question 20

Cohesion + adhesion =

Answer 20

Capillary action

Question 21

Water has a ____ surface tension

Answer 21

High

Question 22

A measure of how difficult it is to break the surface of a liquid

Answer 22

Surface tension

Question 23

Waters high surface tension is caused by the extra storms ___ at its surface

Answer 23

Cohesion

Question 24

The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree Celsius

Answer 24

Specific heat

Question 25

Water has a ___ because it can absorb a large amount of energy with only a slight temp change

Answer 25

High specific heat

Question 26

High specific heat allows water to ___ its temperature

Answer 26

Moderate

Question 27

Water is an almost ______

Answer 27

Universal solvent

Question 28

_____ and _____ compounds dissolve in water because their molecules are separated by water molecules

Answer 28

Ionic and polar covalent

Question 29

____ compounds do not dissolve in water and do not combine

Answer 29

Non polar covalent

Question 30

The human body is mostly made up of what 4 events

Answer 30

Oxygen carbon hydrogen nitrogen

Question 31

Zinc iron and iodine are examples of

Answer 31

Trace elements

Question 32

Protons and neutrons are located in the

Answer 32

Nucleus

Question 33

Electrons surround the nucleus in the___

Answer 33

Electrons cloud

Question 34

Charge of proton

Answer 34

+1

Question 35

Charge of electron

Answer 35

-1

Question 36

Charge of neutron

Answer 36

Neutral

Question 37

Mass of proton

Answer 37

1

Question 38

Mass of neutron

Answer 38

1

Question 39

Mass of electron

Answer 39

0

Question 40

Number of protons can be determined in the

Answer 40

Atomic number

Question 41

___ bonds form when one atoms gives a valance electron to another

Answer 41

Ionic

Question 42

An ionic bond is the _____ between oppositely charged ions

Answer 42

Attraction

Question 43

Properties of water

Answer 43

– cohesion/adhesion, high surface tension, ability to moderate temperature, an almost universal solvent -