Chemistry Of Life

Question 1

Matter:

Answer 1

Takes up space and has mass

Question 2

Elements:

Answer 2

Periodic table, 92 in nature

Question 3

Compounds

Answer 3

Substance with 2 or more diff elements with define ratio

Question 4

What % of natural elements are essential?

Answer 4

25%, meairy they are a must for life

Question 5

How many essential elements do plants humans need?

Answer 5

P:17 h:25

Question 6

What are dominant essential elements

Answer 6

0, c, h, N
CA, p, K, S

Question 7

Trace elements

Answer 7

Also essential but only in small amounts

Question 8

Isotopes

Answer 8

Same proton, diff neutron

Question 9

3 types of intramolecular bones

Answer 9

1, non-polar covalent
2. Polar covalent
③ ionic

Question 10

Ionic bonds

Answer 10

Electro static between metal cation and non-metal anion
Greater than 1.7
Dissociate in polar like water
Ions carry charges and can conduct electricity

Question 11

Covalent bunds

Answer 11

2 non metals, share pair of valence E
Less than 1.7

Question 12

How does en work?

Answer 12

En ≠ 0 then bond is polar covalent
Closer to 1.7 the more polar
Polar covalent have unequal e sharing

Question 13

Hydrophilic and hydrophobic of bonds (polar, nonpolar, ionic)

Answer 13

Hydrophilic: polar and ionic
Hydrophobic: non- polar

Question 14

Formation of hydrogen bunds

Answer 14

Intermolecular
O, N F
High en difference

Question 15

Reversible reactions

Answer 15

Eventually occur at same rateproducts and reactants stop changing:chemical equilibrium