Chapter 2 --> The Chemical Context of Life --> Vocab

Question 1

Matter

Answer 1

Anything that takes up space and has mass.

Question 2

Element

Answer 2

A substance that cannot be broken down to other substances by chemical reactions.

Question 3

Compound

Answer 3

A substance consisting of two or more different elements combined in a fixed ratio.

Question 4

Essential Elements

Answer 4

Elements that an organism needs to live a healthy life and reproduce.

Question 5

Trace Elements

Answer 5

Elements that are required by an organism in only minute quantities.

Question 6

Atom

Answer 6

The smallest unit of matter that still retains the properties of an element.

Question 7

Subatomic Particles

Answer 7

Neutrons (neutral)
Protons (+)
Electrons (-)

Question 8

Atomic Nucleus

Answer 8

The center of an atom.

Question 9

Dalton

Answer 9

The unit of measurement that is used for atoms and subatomic particles.

Question 10

Atomic Number

Answer 10

The number of protons of an atom.

Question 11

Mass Number

Answer 11

The sum of protons plus neutrons in the nucleus of an atom.

Question 12

Atomic Mass

Answer 12

The total mass of an atom.

Question 13

Isotopes

Answer 13

Different atomic forms of the same element.

Question 14

Radioactive Isotope

Answer 14

Where the nucleus decays spontaneously.