TOPIC 2 CHEM WKST

Question 1

What are 4 major elements found in the human body?

Answer 1

Carbon
Hydrogen
Oxygen
Nitrogen

Question 2

Describe 3 types of subatomic particles of an atom and their charge.

Answer 2

Protons- found in the nucleus w/ a positive charge
Neutrons-found in nucleus with no electrical charge
Electrons-found orbiting the nucleus with a negative charge

Question 3

Describe the difference b/w atomic weight and atomic#

Answer 3

Atomic # it’s the number of protons in the nucleus

Atomic weight is the number of protons and neutrons

Question 4

Ionic vs. Covalent bonds

Answer 4

Ionic bonds form by a single electron and are weak
Covalent bonds formed by shearing of pairs of electrons and and have a strong bond

Question 5

What is the difference b/w Organic and Inorganic molecules

Answer 5

Inorganic are non carbon containing

Organic molecules are carbon containing

Question 6

If a molecule has an atomic # of 9 and an atomic weight of 39 how many protons and neutrons does the molecule have ?

Answer 6

9 protons and 30 neutrons

Question 7

If an atom has gained an electron, what is this called

Answer 7

Ion

Question 8

If a chemical reaction stores or takes in energy, what type of reaction is this called?

Answer 8

Anabolic reaction

Question 9

What molecule is the primary source of energy for the body?

Answer 9

ATP

Question 10

If a person has an arterial pH is 7.30,what has happened to their pH? What does this mean for the number of H+ ions?

Answer 10

Slightly acidic, ions have increased

Question 11

If a protein is used to increase the speed of a chemical reaction, what do we call this protein?

Answer 11

Enzyme or catalyst