2.1 The chemical Level of Organization

Question 1

Elements are given _____symbols

Answer 1

Chemical

Question 2

Oxygen, carbon, hydrogen, and nitrogen are examples of____

Answer 2

Elements

Question 3

The two types of elements in the body are

Answer 3

Major elements and trace elements

Question 4

Oxygen, carbon, and hydrogen are examples of ______ elements.

Answer 4

Major

Question 5

Which element with only .005 % of the total body mass but is still considered a major element?

Answer 5

Iron

Question 6

Aluminum, iodine, and manganese are all examples of _____ elements

Answer 6

Trace

Question 7

The science of the structure and interactions of matter.

Answer 7

Chemistry

Question 8

Smallest unit of matter.

Answer 8

Atom

Question 9

3 types of atoms:

Answer 9

Protons, neutrons, and electrons

Question 10

Chemical elements are composed of units of matter of the same type called _____

Answer 10

Atoms

Question 11

The number of protons in the nucleus of an atom =

Answer 11

Atomic number

Question 12

The # of protons and neutrons in an atom =

Answer 12

Mass number

Question 13

Different atoms of the same elements that have the same number of protons but different number of neutrons are called ____

Answer 13

Isotopes

Question 14

Each atom is electrically neutral. True or false?

Answer 14

True

Question 15

Unstable isotopes are called

Answer 15

Radioactive

Question 16

Average mass of all stable atoms of a given element in daltons is referred to as____ ____

Answer 16

Atomic mass

Question 17

An atom that has lost or gained electrons is called a/an_____

Answer 17

Ion

Question 18

2 or more atoms sharing electrons is a/an_____

Answer 18

Molecule

Question 19

A substance that can be broken down into 2 or more different elements is a/an_____

Answer 19

Compound

Question 20

The ___-____ of an isotope is the time required for half of the radioactive atoms in a sample of that isotope to decay into a more stable form.

Answer 20

Half-life

Question 21

A ___. ____ occurs when atoms are held together by forces of attraction

Answer 21

Chemical bond

Question 22

The outer most shell

Answer 22

Valence shell

Question 23

The two different kinds of bonds are

Answer 23

Ionic bonds & covalent bonds

Question 24

A bond with two or more atoms share electrons rather then gaining or losing them is called a/an____ _____.

Answer 24

Covalent bond

Question 25

Standard unit for measuring the mass of atoms and their subatomic particles is a ____.

Answer 25

Dalton

Question 26

Atomic weight is another way of referring to

Answer 26

Atomic mass

Question 27

The ___ ____ of an element is the average mass of all its naturally occurring isotopes.

Answer 27

Atomic mass

Question 28

The tendency of like particles to stay together is called

Answer 28

Cohesion

Question 29

The measure of the difficulty of stretching or breaking the surface of a liquid is called

Answer 29

Surface tension