Chapter 2 Midterm Review

Question 1

Name the 4 most important elements to all living things

Answer 1

Oxygen, Carbon, Hydrogen, Nitrogen

Question 2

What is importance of trace elements?

Answer 2

A trace element is an element that is essential for life but required in extremely minute amounts. it is important for bodily functions such as bone formation, nerve signaling strong, teeth

Question 3

What is the basic structure of an atom?

Answer 3

Protons and neutrons in the center, an electron cloud surrounding that core.

Question 4

How can radioactivity be helpful or harmful to orgasnisms

Answer 4

Radioactive isotopes are easy to trace and to locate and/or kill harmful cells, but then can also harm non dangerous cells and cause abnormal chemical bonds to form

Question 5

TE

Iron

Answer 5

Vital for energy processing and transporting oxygen.

Question 6

TE

Phosphorus

Answer 6

Bone formation

Question 7

TE

Sulfur

Answer 7

important for bone formation and nerve signaling

Question 8

Atom

Answer 8

Smallest unit of matter, building blocks of life.

Question 9

Atomic number

Answer 9

amount of protons in the nucleus

Question 10

Mass number

Answer 10

the sum of the number of protons and neutrons

Question 11

Atomic mass

Answer 11

approximately equals the mass number

Question 12

Isotopes

Answer 12

one of sever atomic forms of an element, same # of protons different # of neutrons

Question 13

difference between ionic and covalent bond

Answer 13

Covalent: share electron
Ionic: one element strips electron from the other creating a positive and negative charged atom