Chemistry Of Life

Question 1

Element

Answer 1

Pure form of matter containing only one kind of atom

Question 2

Atom

Answer 2

Smallest particle of an element; cannot be broken down by ordinary chemical processes

Question 3

Protons

Answer 3

Positive charge
Has mass
Used to determine atom’s identity

Question 4

Neutrons

Answer 4

No charge
Has mass
Number can change

Question 5

Electrons

Answer 5

Negative charge
Mass is negligible
Number can change

Question 6

98% of life is made up of CHNOPS

Answer 6

Carbon
Hydrogen
Nitrogen
Oxygen
Phosphorus
Sulfur

Question 7

Number of elements important to life

Answer 7

14

Question 8

Atomic number

Answer 8

Equal to number of protons in an atom of the element

Question 9

Atomic mass

Answer 9

Weight of all protons and neutrons within an atom

Question 10

Shells

Answer 10

Orbits of electrons which represent energy levels

Question 11

Valence electrons

Answer 11

Electrons in outermost shell

Question 12

Covalent bonds

Answer 12

Sharing of electrons between atoms

Question 13

Law of conservation of mass

Answer 13

Matter is neither created nor destroyed

Question 14

Molecule

Answer 14

Stable association between two or more atoms formed by covalent bonding

Question 15

Ionic bonds

Answer 15

Transfer of electrons between atoms

Question 16

Ion

Answer 16

Charged atom

Question 17

Compound

Answer 17

Forms from electrostatic attraction of many ions

Question 18

Hydrogen bonds

Answer 18

Bonds between already covalent bonded hydrogen and another electronegative atom

Question 19

Polarity

Answer 19

Different parts of the molecule have slightly different charges

Question 20

Hydrophilic

Answer 20

Water loving; readily react with water

Question 21

Hydrophobic

Answer 21

Water hating; water forms itself around these compounds

Question 22

Matter

Answer 22

Physical substance that takes up space and has mass