Unit 2: Chemistry of Life

Question 1

Anything that takes up space and has mass to it.

Answer 1

matter

Question 2

he simplest form of a substance that cannot be broken apart and still have the properties of that element.

Answer 2

element

Question 3

Two or more elements bonded together resulting in new chemical properties to emerge for the compound.

Answer 3

compound

Question 4

a stable liquid and can sometimes be used to out a fire. Hydrogen by itself is a flammable gas; Oxygen by itself is also a flammable gas.

Answer 4

H2O

Question 5

The most common elements in all life forms.

Answer 5

CHNOPS

Question 6

present in small amounts

Answer 6

Trace elements

Question 7

The smallest unit of matter with set chemical properties.

Answer 7

atom

Question 8

_________ maintain their original properties because the subatomic parts are all present.

Answer 8

Atoms

Question 9

Small parts that make up atoms.

Answer 9

Subatomic particles

Question 10

means “below” or “lower”

Answer 10

sub

Question 11

These particles carry a positive charge. They are located in the nucleus of an atom.

Answer 11

Protons

Question 12

The number of these in an element never changes

Answer 12

Protons

Question 13

What allowed for the Periodic Table to be created?

Answer 13

The number of protons in an element never changes

Question 14

These particles carry no charge, which is called neutral. They are also located in the nucleus of an atom.

Answer 14

Neutrons

Question 15

Atoms with different numbers of neutrons than the normal amount for that element are called ________

Answer 15

Isotopes

Question 16

The number of ________ or _________ in an atom can change.

Answer 16

neutrons or electrons

Question 17

These particles carry a negative charge. They are located outside the nucleus in the “_______ cloud”.

Answer 17

electron

Question 18

The electrons moving

Answer 18

kinetic energy

Question 19

When electrons are bonded

Answer 19

potential energy

Question 20

Atoms with different numbers of electrons than the normal amount for that element are called _____

Answer 20

Ions

Question 21

The cloud is divided into _______ ________. The first energy level holds two electrons. The second and third hold eight electrons.

Answer 21

energy levels

Question 22

Atoms are weighed in units called _______ or _________ ________ ________.

Answer 22

Daltons or Atomic Mass Units (AMU’s)

Question 23

Each ________ or ________ (these are the largest sub-atomic particles) is equal to 1 Dalton or 1AMU.

Answer 23

proton or neutron

Question 24

________ are basically 1/1000 of a Dalton.

Answer 24

Electrons

Question 25

Two or more atoms bonded together. (They maybe the same type of atom or they maybe different atoms.)

Answer 25

Molecule

Question 26

It refers to the number of protons only in that element.

Answer 26

Atomic number

Question 27

refers to the number of protons and neutrons together in that element or molecule.
These are the two subatomic particles that have “significant mass or weight” associated with them. Remember electrons have very little mass, so you can just add protons and neutrons.

Answer 27

Mass Number or Atomic Weight

Question 28

Atoms that possess different numbers of neutrons than the normal amount for that element and thereby have different mass numbers.

Answer 28

Isotopes

Question 29

Most isotopes are _____________.

Answer 29

radioactive

Question 30

These usually have the same chemical properties as the normal element, but the physical properties maybe different.

Answer 30

Isotopes