Chemistry of Life Part 1

Question 1

Matter

Answer 1

is anything that takes up space and has mass

Question 2

element

Answer 2

is a substance that cannot be broken down to other substances by chemical reactions
ex.gold

Question 3

compound

Answer 3

is a substance consisting of 2 or more elements combined in a fixed ratio
ex. H20

Question 4

What is the percentage of C, H, O, and H make up in living matter?

Answer 4

96%

Question 5

Trace Elements

Answer 5

are those required by an organism in the only minute qualities

Question 6

atoms

Answer 6

are the smallest unit of an element that still retains the property of an element

Question 7

protons

Answer 7

are positively charged particles found in the nucleus

Question 8

electrons

Answer 8

are negatively charged particles found in outer shells

Question 9

Isotopes

Answer 9

are forms of an element with differing numbers of neutrons

Question 10

Atomic Number

Answer 10

is the number of protons an element possesses

Question 11

Mass Number

Answer 11

of an element is the sum of its protons and neutrons