Chapter 2 - Atoms, Molecules, and Life

Question 1

6 Elements of 92% of Organisms

Answer 1

Carbon, Hydrogen, Oxygen, Phosphorus, Calcium, Nitrogen

CHOPCaN

Question 2

Mass =

Answer 2

Proton plus Neutrons

Question 3

Atomic Number

Answer 3

of Protons

Question 4

Elements

Answer 4

Unable to divide and be the same thing

Question 5

Covalent Bond

Answer 5

Strongest, most common; electrically neutral, shares electrons (O to H in H2O)

Question 6

Ionic Bond

Answer 6

Loss or gain of electron from ions to form a stable compound (NaCl)

Question 7

Hydrogen Bond

Answer 7

Weak, slightly polar; therefore attractive to other slightly polar molecules (H2O molecules sticking to other H2O molecules)

Question 8

Atom Structure

Answer 8

Nucleus (protons and neutrons) and electron cloud

Question 9

Molecule

Answer 9

2+ atoms held together by bonds

Question 10

Compound Molecules

Answer 10

2+ elements

Question 11

Mass Number of Element =

Answer 11

The mass of its atom’s protons and neutrons

Question 12

Water Cohesion

Answer 12

Water molecules stick together (H bonds)

Question 13

Water Adhesion

Answer 13

Water molecules stick to slightly charged surfaces (capillary action - plants and blood)

Question 14

Acids

Answer 14

H+ ions, 0-6.99 pH, instant pain due to fat hydrolysis

Question 15

Bases

Answer 15

OH- ions, 7.01-14 pH, delayed pain via protein denaturation

Question 16

Water

Answer 16

Hydrophobic, hydropholic, takes a lot of energy to heat up, takes a lot of energy to evaporate; H bonds break and release heat => sweat