Book : Ch. 2

Question 0

What are protons?

Answer 0

Subatomic particles carrying a positive charge

Question 1

What are atoms ?/

Answer 1

Particles that are the building blocks of all substances

Question 2

What are neutrons?

Answer 2

Subatomic particles carrying no charge

Question 3

What are electrons?

Answer 3

Subatomic particles carrying a negative charge

Question 4

What is a charge?

Answer 4

An electrical property that attracts/repels other subatomic particles

Question 5

What is an atomic number?

Answer 5

An amount of protons an element contains

Question 6

What is an element?

Answer 6

Pure substance containing only of atoms with the Same amount of protons

Question 7

What is a mass number?

Answer 7

Total number of protons/neutrons in a nucleus

Question 8

What is a periodic table?

Answer 8

All elements known in a table based on their chemical properties

Question 9

What is a radioisotope ?

Answer 9

Radioactive isotope

Question 10

What is radioactive decay?

Answer 10

The spontaneous emission of energy when their nucleus breaks down

Question 11

What is a tracer?

Answer 11

Any molecule with a detectable substance attached

Question 12

What is a shell model?

Answer 12

Used to check an atom for vacancies

Question 13

What is an ion?

Answer 13

Atom with a different amount of electrons and protons

Question 14

What is electro negativity?

Answer 14

Measure of an atoms ability to pull electrons from other atoms

Question 15

What is a chemical bond?

Answer 15

Attractive force that arises between two atoms when their electrons interact.

Question 16

What is a molecule?

Answer 16

Formation when two or more atoms of the same or different elements join in chemical bonds

Question 17

What are compounds?

Answer 17

Molecules that consist of two or more different elements in proportions that do not vary

Question 18

What is a mixture?

Answer 18

Two or more substances intermingle. Does not bond

Question 19

What is a covalent bond?

Answer 19

Two atoms sharing a pair of electrons

Question 20

What is non polar?

Answer 20

Atoms participating in bond share electrons equally

Question 21

What is polar?

Answer 21

Atoms participating in a bond do not share electrons equally

Question 22

What is polarity?

Answer 22

Separation of charge into distinct positive and negative regions

Question 23

What is a hydrogen bond?

Answer 23

Weak attraction between a highly electronegative atom and a hydrogen atom

Question 24

What is a solvent?

Answer 24

Liquid that can dissolve other substances

Question 25

What is a solute?

Answer 25

The substance being dissolved

Question 26

What does hydrophilic mean?

Answer 26

Polar molecules that are water loving

Question 27

What does hydrophobic mean?

Answer 27

Water dreading substances ie.oils

Question 28

What is temperature?

Answer 28

Way to measure energy of a molecular motion (vibration)

Question 29

What is evaporation?

Answer 29

Molecules move faster and individual molecules at the waters surface escape into the air

Question 30

What is cohesion ?

Answer 30

Molecules resist separating from one another

Question 31

What is ph?

Answer 31

The measure of the amount of hydrogen ions in a solution

Question 32

What are acids?

Answer 32

They donate hydrogen ions as they dissolve in water

Question 33

What do bases do?

Answer 33

They accept hydrogen atoms

Question 34

What is a salt?

Answer 34

Something that dissolves easily in water and releases ions other than h+ and oh-

Question 35

What is a buffer system ?

Answer 35

Weak acid or base and it’s salt that can keep the ph of a solution stable