Chem culminating final lab

Question 1

What is the difference between molecular and ionic compounds

Answer 1

Ionic compounds contain a metal

Question 2

Substances with a pH of 7=

Answer 2

natural

Question 3

Substances with a pH of less than 7=

Answer 3

acidic

Question 4

Substances with a pH of more than 7=

Answer 4

bases

Question 5

The closer the acid/base is to 7…

Answer 5

the weaker it is

Question 6

What are bases?

Answer 6

A substance is a base if it contains OH-

Question 7

What colour does blue litmus paper turn when dipped in an acidic solution

Answer 7

red

Question 8

What colour does blue litmus paper turn when dipped in a neutral/base solution

Answer 8

it stays blue

Question 9

What colour does red litmus paper turn when dipped in a neutral/base solution

Answer 9

it stays red

Question 10

What colour does red litmus paper turn when dipped in an acidic solution

Answer 10

blue

Question 11

how does phenolphthalein (clear liquid) react with acids and neutral solutions?

Answer 11

Turns clear

Question 12

how does phenolphthalein (clear liquid) react with bases?

Answer 12

turns pink

Question 13

how does bromothymol blue react with acids

Answer 13

turns yellow

Question 14

how does bromothymol blue react with neutral solutions?

Answer 14

turns green

Question 15

how does bromothymol blue react with bases

Answer 15

stays blue

Question 16

Is the melting point of ionic compounds high or low?

Answer 16

high

Question 17

Are ionic compounds usually solid, liquid, or gas?

Answer 17

solid

Question 18

Do ionic compounds exude an odor usually

Answer 18

yes

Question 19

Are Ionic Compounds hard or soft

Answer 19

hard

Question 20

Are ionic compounds brittle or non-brittle?

Answer 20

brittle

Question 21

Are ionic compounds soluble or non-soluble

Answer 21

soluble

Question 22

Are ionic compounds conductive?

Answer 22

yes

Question 23

What is an electrolyte

Answer 23

ions

Question 24

Do covalent compounds have a high or low melting point?

Answer 24

low

Question 25

What state are covalent compounds

Answer 25

varies

Question 26

Do covalent compounds exude an odor

Answer 26

sometimes

Question 27

Are covalent compounds hard or soft?

Answer 27

Soft

Question 28

Are covalent compounds soulable

Answer 28

sometimes

Question 29

Are covalent compounds conductive?

Answer 29

No, they do not form ions

Question 30

What is a Synthesis reaction

Answer 30

Atoms or elements that are joined together to form a new compound Has 2 or more reactants to form ONE product

Question 31

What is the general formula of a synthesis reaction

Answer 31

a+b → ab

Question 32

What is a decomposition reaction

Answer 32

a compound or molecule breaks down into 2+ simpler atoms or elements One reactant breaks down into 2 or more products

Question 33

What is the general formula of a decompisiton reaction

Answer 33

ab → a+b

Question 34

What is a single displacement reaction

Answer 34

One element and another element in a compound Reactants: 1 element and 1 compound Products: 1 different element and 1 different compound a metal can only displace another metal/cation a nonmetal can only displace another nonmetal/anion

Question 35

What single displacement general formula for metals and non-metals

Answer 35

Metals: AB+C → CB+A Nonmetals: AB+C → AC+B *don't carry subscripts through

Question 36

Double Displacement Reactions

Answer 36

elements with 2 different compounds switch places, forming 2 new compounds 2 reactants (both compounds) and 2 products (2 different compounds)

Question 37

Double Displacement general formula

Answer 37

ab+cd → ad+cb *always metak before nonmetal

Question 38

Hydrocarbon combustion

Answer 38

combustion is the very eapid reaction of a hydrocarbon with oxygen to produce carbon dioxide, water, and energy

Question 39

What are hydrocarbons

Answer 39

Compound containing mostly H & C

Question 40

Hydrocarbon combustion general formula

Answer 40

CxHy+O2 → CO2+ H2O

Question 41

Neutealization

Answer 41

Occurs when an acid and base react When an acid and base react, the products are water and salad eg. HCL (aq)+ NaOH (aq) → NaCl+H2O

Question 42

If there is a compound with only carbon and hydrogen what does that mean

Answer 42

it is combustion