Chemistry test #2

Question 1

What is a weak acid/base and what is a strong acid/base

Answer 1

weak acid : Ph 4-6 (close to neutral)
Strong acid : PH 0-4 (far from neutral)

Weak Base : PH 7-10 (close to neutral)
Strong Base : PH 11-14 (far from neutral)

Question 2

what does it mean if a substance is neutral

Answer 2

It has a PH value of 7

Question 3

What is a chemical reaction

Answer 3

Process that changes chemicals starting materials (reactants) into something new (products)

Question 4

What are reactants

Answer 4

Your starting materiel is a chemical reaction

Question 5

what are products

Answer 5

your ending materiel in a chemical reaction

Question 6

What is Synthesis

Answer 6

Combining element and or compounds in a larger compound

Question 7

what is Decomposition

Answer 7

A type of reaction that would break down a compound into elements

Question 8

What is double displacement

Answer 8

Elements of different compounds displace each other by changing places

Question 9

What is Single Displacement

Answer 9

One element Displaces or replace another from a compound

Question 10

What is neutralization

Answer 10

Reaction between an acid and a base, Type of double displacement

Question 11

What is a Diatomic Molecule

Answer 11

Kind of molecule made of 2 bonded atoms of the same element

Question 12

What does exothermic mean

Answer 12

When temperature increases, The reaction produces heat

Question 13

What does endothermic mean

Answer 13

When temperature decreases, the reaction requires energy

Question 14

What is a chemical change

Answer 14

Changed the kind of particle presented
e.g. burning paper turns in to ash and smoke

Question 15

What is GHS

Answer 15

Globally Harmonized Symbols
symbols found on dangerous products used at work

Question 16

What is HHPS

Answer 16

Hazardous House Product Symbols
Symbols found on dangerous substances found at home

Question 17

Balancing Strategies

Answer 17

1. Balence metal elements
2. balance non-metal elements (not H and O)
3. Balance H and O
4. Double check

Question 18

Some elements can’t be a single atoms

Answer 18

H, O,F,Br,I,N,Cl

Question 19

Difference between PH paper and litmus paper

Answer 19

PH paper tells you its PH value and if it is a strong or weak acid/base
Litmus paper only tells you if it is an acid or base

Question 20

Litmus paper rules

Answer 20

Blue Litmus Paper :
Turns blue = base
turns red = acid

Red Litmus Paper :
Turns blue = base
turn red = acid

Question 21

Formation of gas using splints

Answer 21

Oxygen = glowing splint and it will relight
Carbon Dioxide = burning splint and it will go out
Hydrogen + burning splint and will create mini explosion and pop noise

Question 22

Indicators of a chemical change

Answer 22

1. Change in colour
2. change is odour
3. change in temperature

Question 23

HHPS symbols

Answer 23

• toxic
• flammable
  -corrosive
  – explosive (contents of container) ^
  explosive (container)

Question 24

what does room 2013 not have

Answer 24

spill kit and safety shower

Question 25

GHS symbols

Answer 25

- flammable -corrosive - explosion - toxic - irritant/harmful - hazardous health - damage to environment - oxidizing - compressed gas

Question 26

who is Antoine Lavoisier

Answer 26

Discovered mass is neither created nor lost during a chemical reaction

Question 27

Who is Emil Erlenmeyer

Answer 27

created Erlenmeyer flask

Question 28

who is Robert bunsen

Answer 28

created Bunsen burner

Question 29

who is Søren Sørenson

Answer 29

created the PH scale

Question 30

Lab safety equipment

Answer 30

- fire extinguisher - eye wash station - fume hood - broken glass disposal - spill kit - safety shower - fire alarm

Question 31

Some Lab rules

Answer 31

- hair tied up -teacher supervision -no running - glasses on - no eating or drinking

Question 32

Comparing acid and base

Answer 32

acid: formula always starts with H Sour tasting PH<7 Base: Formula always has (OH) in it bitter tasting PH>7

Question 33

what is a erlenmeyer flanked used for

Answer 33

Allows mixing without spillage

Question 34

what is a watch glass used for

Answer 34

Holds small amounts of a chemical can be put over container during reaction

Question 35

what is a test tube brush used for

Answer 35

cleaning out test tubes

Question 36

what is a graduated cylinder used for

Answer 36

measuring volume of a liquid

Question 37

morter and pestle

Answer 37

used for grinds solids a fine powder

Question 38

clay triangle

Answer 38

supports crucibles when being heated over Bunsen burner

Question 39

Test Tube Holder

Answer 39

holds ONE test tube

Question 40

Florence flask

Answer 40

round flask suited for uniform heating (named after a city in Italy)

Question 41

Tweezers

Answer 41

picked up small items

Question 42

scopula

Answer 42

dispenses a solid chemical from a container

Question 43

retort clamp or stand

Answer 43

supports holds or clamp lab equipment into place c

Question 44

crucible clamp

Answer 44

Moves and hold a hot crucible

Question 45

beaker tongs

Answer 45

move and hold hot beakers