Qual and Quan

Question 1

What are the two types of chemists

Answer 1

Synthetic and Analytical

Question 2

What does a synthetic chemist do

Answer 2

make new and improved materials

Question 3

What does a Analytical chemist do

Answer 3

test and analyze materials and the materials’ properties

Question 4

What types of analysis do Analytical chemists perform

Answer 4

Quantitative and Qualitative analysis

Question 5

What is a quantitative analysis

Answer 5

determines the amount of something in a substance

Question 6

what is a qualitative analysis

Answer 6

identify the substance (figure out which element and/or compound is present )

Question 7

What are the three ways to determine the presence of a species in qualitative observation

Answer 7

• indicators
• precipitation rxns
• solution color changes

Question 8

what was the chemical equation for the center well in “Acid rain in a bag”

Answer 8

copper+nitric acid-> copper nitrate+ nitrogen dioxide gas+ water

Question 9

What were the middle wells filled with in “Acid Rain in a bag”

Answer 9

Distilled Water

Question 10

What gas was produced that dissolves in water in “Acid rain in a bag”

Answer 10

NO2 gas

nitrogen dioxide

Question 11

What does the dissolving of the NO2 gas in water produce in the “Acid Rain in a bag” lab

Answer 11

Acid Rain

Question 12

What were the outer wells filled with in “Acid rain in a bag”

Answer 12

Universal indicator solution

Question 13

What happens when the colors change in “acid rain in a bag”

Answer 13

the pH falls

Question 14

What are the two types of water pollution

Answer 14

Point and Nonpoint Specific Pollution

Question 15

What is point specific pollution

Answer 15

• comes from a specific area
• easily solved
• ex: factory with discharge pipe in water

Question 16

What is non point specific pollution

Answer 16

• comes from not just one location

- ex: runoff water

Question 17

In “Chemical Analysis of water” where does the polluting ion carbonate come from

Answer 17

Rocks like limestone & dissolved atmospheric CO2

Question 18

In “Chemical Analysis of water” where does the polluting ion chloride come from

Answer 18

Rocks and soil

Question 19

In “Chemical Analysis of water” where does the polluting ion sulfate come from

Answer 19

Rocks and soil

Question 20

In “Chemical Analysis of water” where does the polluting ion Lead (II) come from

Answer 20

Gasoline additive

Question 21

In “Chemical Analysis of water” where does the polluting ion Phosphate come from

Answer 21

Fertilizers, detergent, waste (excrements)

Question 22

In “Chemical Analysis of water” where does the polluting ion Iron (III) come from

Answer 22

Rocks and soil
Industrial waste (corroding pipes)

Question 23

In “Chemical Analysis of water” where does the polluting ion Chromate come from

Answer 23

Industrial waste (paint)

Question 24

In “chemical analysis of water” _____ was added to carbonate which resulted in __________

Answer 24

1. hydrogen

2. bubbles

Question 25

In "chemical analysis of water" _____ was added to chloride which resulted in __________

Answer 25

1. silver | 2. white solid

Question 26

In "chemical analysis of water" ____was added to sulfate which resulted in __________

Answer 26

1. barium | 2. cloudy white milky

Question 27

In "chemical analysis of water" _____ was added to Chromate which resulted in __________

Answer 27

1. hydrogen | 2. dark blue

Question 28

In "chemical analysis of water" _____ was added to iron (III) which resulted in __________

Answer 28

1. thiocyannate | 2. blood red

Question 29

In "chemical analysis of water" _____ was added to Lead (II) which resulted in __________

Answer 29

1. chromate | 2. bright yellow solid

Question 30

In "chemical analysis of water" _____ was added to phosphate which resulted in __________

Answer 30

1. silver | 2. pale yellow

Question 31

In "Chemical Analysis of water" which ion solution was contaminated so was not performed

Answer 31

Phosphate ion

Question 32

What testing was used in "Lead in soil" lab

Answer 32

Rhodizonate testing

Question 33

"Lead in soil" Yellow colored sodium rhodizonate reacts with ___ to form a pink complex

Answer 33

lead

Question 34

What were limitations to the method used in "Lead in soil

Answer 34

- Other metals (tin, silver, cadmium, and barium) form pink complex too - The test solution degrades quickly (test kits must be used within minutes of mixing)

Question 35

What method was used in the "Lead in Soil" lab

Answer 35

colormetric

Question 36

What are the three types of quantitative analysis

Answer 36

- Volumetric - Gravimetric - Instrumental

Question 37

What is Volumetric analysis and what technique is used in it

Answer 37

measure volume of a substance with a known concentration to calculate the MASS of an unknown Technique used – titration

Question 38

what is gravimetric analysis

Answer 38

measure the mass of a precipitate formed and use atomic mass to calculate MASS of unknown in the precipitate

Question 39

what is the endpoint in volumetric analysis

Answer 39

End point: when all of the unknown substance is used up (reaction stops)

Question 40

Volumetric analysis Involves the use of ____, which visually shows you reaction completion (the end point).

Answer 40

an indicator

Question 41

What is the indicator in "Ca in milk"

Answer 41

Hydroxynapthol blue is the indicator

Question 42

what is EDTA in "Ca in milk"

Answer 42

- is electron donor (like single replacement) so oxidation reduction - like a claw (surrounds the calcium ion and pulls it inside of itself spherical molecule)

Question 43

what is the indicator in "Ascetic Acid in vinegar"

Answer 43

Phenolthalein is the indicator (clear in vinegar to pink when reaction complete)

Question 44

What is vinegar titrated with in "Ascetic acid in vinegar"

Answer 44

Vinegar (unkown) is placed in Erlenmeyer flask and is titrated with NaOH (in buret)

Question 45

What type of rxn occurs in "Ascetic Acid in vinegar"

Answer 45

acid/base rxn

Question 46

What is the aimed percent acidity in "Ascetic acid in vinegar"

Answer 46

5%

Question 47

What rxn is involved in gravimetric analysis and what MUST form

Answer 47

precipitation rxn | 1 solid must form

Question 48

what are the final three steps to achieving your answer in gravimetric analysis

Answer 48

filter dry weigh substance

Question 49

What are industrial uses of gravimetric analysis

Answer 49

- Measurement of the “essential” elements in plant foods (phosphorus, for example, is converted into the insoluble salt, magnesium ammonium phosphate) - Estimation of pollutants in the air, such as sulfur dioxide (by conversion to insoluble barium sulfate) - Estimation of sulfur dioxide (used to prevent spoilage) in soft drinks, such as orange juice. - Estimation of chloride ions in water supplies (by conversion to insoluble silver chloride). - Water quality studies  filter retailers

Question 50

Vocab: what is an indicator

Answer 50

changes color in response to pH movement and visually shows the experimenter that the reaction has run to completion.

Question 51

Vocab: What is the end point

Answer 51

the point at which the indicator changes color to visually show when all of the unknown substance has been fully consumed by the reaction (reaction stops)

Question 52

Vocab: What is titration

Answer 52

the common laboratory technique used in volumetric analysis

Question 53

Vocab: What is Gravimetric Analysis

Answer 53

uses the solubility rules to pull the ion of interest out of solution as a solid. Then, the mass of the precipitate formed is measured and used to calculate MASS of unknown ion in the precipitate.

Question 54

Vocab:What is Volumetric Analysis

Answer 54

uses the volume ( mL) of a substance of known concentration (molarity = moles per liter) to calculate the mass of another substance.

Question 55

Industrial uses of volumetric analysis

Answer 55

- Food Chem- calculate nutritional information (mg of Ca in milk, acidity of vinegar etc) - Quality Control- pharmecutecals, cleaning products, water treatment plants, cosmetics

Question 56

Draw the diagram of the ascetic acid in vinegar lab

Answer 56

:)

Question 57

Equation of molar concentration

Answer 57

moles/liters

Question 58

In the labs "ca in milk" and "Ascetic acid in vinegar", the indicator was added to what

Answer 58

solution containing unknown amounts of a substance

Question 59

What is the known concentration of EDTA

Answer 59

0.04 M

Question 60

industrial uses qual. analysis

Answer 60

forensic chemists pharm chemists- impuritues in new substances enviro. chemists- ion tests in water