Order the steps (EDTA-TITN)

1: Add pH 10 buffer to unkown 2: Precipitate mg with NaOH 3: Weigh H blue

What is the difference between synthetic and materials chemistry?

SC create new stuff from old, MC on changing structure to change properties

Order the steps for the Kool-Aid experiment

1. Attach syringe to column 2: Take stock dyes 3: Make standard solutions

What does a non-scanning spectrophotometer do?

Measures the asorbance of a sample at a specific wavelength

Order the Prussian Blue steps

1: Prepare KCl 2: Complete a deposition 3: Immerse ITO glass in KCl

What is an electrochromic material

A material that changes in opacity/colour as electrical current is passed

C is separated out into the aqueous layer when the rinsing solven is HCl. Then, B is separated out when rinsed with NaOH

Deprotonated B is soluble in the aqueous layer

Which has the strongest binding strength

EDTA in a buffer solution of pH 10-metal

What happens in IR spectroscopy?

Energy is used to move molecules, making bond identities in a polymer known

What's the difference between HDPE and LDPE plastic?

HDPE has linear structure, LDPE is branched.

How is Prussian Blue synthesized?

Potassium hexacyanoferrate (3) reacts with iron (3) chloride and electrons

What is atom economy?

Ratio of the desired products created and the total mass of products

When is Prussian Yellow synthesized?

When Prussian Blue is oxidized in the presence of chloride ions

Order the CHEM SEP steps

1: Put diethyl ether test tubes 2: Create a sep strategy 3: Use scan spectr

When does calcon change colour (turn blue)

When it is not bound to metal ions

What is a coordinate bond?

A covalent bond where one species provides all the electrons

What is a biphasic mixture

A mixture made of two immiscible phases

Order the steps for IR Plastics

1: cut samples 2: wipe the crystal 3: print the spectrum

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Questions 32

Answers

1
Order the steps (EDTA-TITN)
1: Add 6 drops calcon 2: Fill burette with EDTA 3: Test pH
1: Add pH 10 buffer to unkown 2: Precipitate mg with NaOH 3: Weigh H blue
1: Add H blue to NaOH mixture 2: Add calcon to each flask 3: Do titration
2
What is the difference between synthetic and materials chemistry?
SC create new stuff from old, MC on changing structure to change properties
They're the same
SC on changing structure to change properties, MC creating new compounds
SC on compounds not containing carbon, MC on creating new compounds
3
Which energy level transition of an electron from a hydrogen atom requires the shortest wavelength of light
n=10 to n=11
n=10 to n=15
n=1 to n=2
n=1 to n=3
4
Order the steps for the Kool-Aid experiment
1. Attach syringe to column 2: Take stock dyes 3: Make standard solutions
1: Identify which stock dye 2: Record absorbance 3: Draw dye through column
1: Pour kool-aid into column. 2: Attach syringe 3: use ns spectro (absorb)
5
What does a non-scanning spectrophotometer do?
Measures the asorbance of a sample at a specific wavelength
The same thing as a scanning spectrophotometer and shows the species colour
Measures the absorbance of a species to create an absorbance spectrum
Measures the absorbance of a compound over a range of wavelengths
6
Order the Prussian Blue steps
1 Find conduct side 2 Set current to 150microA 3 Complete first deposition
1Touch red wire to neg side of battery 2 Use the ns spectro 3 Run 2nd blank
1: Prepare KCl 2: Complete a deposition 3: Immerse ITO glass in KCl
7
The ratio between the two linear relationships (change in energy and inverse wavelength) is equal to what?
h*c
c^h
h/c
c/h
8
Stationary phase: silica. Mobile phase: water. Blue I is more polar than Red 40. Which will exit the column first?
Blue I
Red 40
9
What is an electrochromic material
Material that transfers a current to another substance, changing its colour
A material that coats a conductive surface, changing the surface's colour
A material that changes in opacity/colour as electrical current is passed
A material that changes in colour as an electrical current is passed
10
C is separated out into the aqueous layer when the rinsing solven is HCl. Then, B is separated out when rinsed with NaOH
Deprotonated B is soluble in the aqueous layer
A is polar when in basic solution
Protonated A is soluble in the aqueous layer
C is nonpolar
11
Why is ITO used to coat the glass in the Prussian Blue experiment?
All of the above
ITO is an electrochromic material.
ITO makes the glass conductive
ITO turns blue when it's in contact with Prussian Blue and a current passed
12
Which has the strongest binding strength
hydroxynaphthol blue in NaOH-metal
EDTA-metal
calcon-metal
EDTA in a buffer solution of pH 10-metal
13
Two oxygen anions are oxidized to form an oxygen molecule
True
False
14
What happens in IR spectroscopy?
Energy is used to break bonds, making types of bonds in a molecule known
Energy is used to move molecules, making bond identities in a polymer known
Energy is used to excite electrons, making the makeup of the species known
Energy is used to rotate polymers, making properties of the species known
15
Bonds with greater dipole moment require more energy to vibrate
False
True
16
Calcon works better than Hydroxynaphthol blue as an indicator in highly basic environments
False
True
17
What's the difference between HDPE and LDPE plastic?
HDPE has more peaks on its spectrum than LDPE.
HDPE has a chlorine attached to the carbon chain. LDPE does not
HDPE has a peak at a higher wavenumber than LDPE.
HDPE has linear structure, LDPE is branched.
18
Two different molecules made up of identical monomers can be differentiated using IR spectroscopy
True
False
19
How is Prussian Blue synthesized?
The oxidation of Prussian Yellow
The reduction of Everitt Salt
Potassium hexacyanoferrate (3) reacts with iron (3) chloride and electrons
When potassium hexacyanoferrate (III) is mixed with iron (III) chloride
20
In AES, which instrument gave the most precise and accurate results?
Nonscanning spectrophotometer
Spectroscope
Ocean Optics spectrophotometer
Scanning spectrophotometer
21
What is atom economy?
A percentage of waste products
Ratio of the desired products created and the total mass of products
Ratio of products and reactants
Ratio of the products created and the total possible mass of products
22
The intensity of emitted light is directly proportional to the elements' concentration
False
True
23
When is Prussian Yellow synthesized?
When Prussian Blue is reduced in the presence of potassium ions
When the red wire touches negative during the electrochromic testing stage
When Prussian Blue is oxidized in the presence of chloride ions
When the red and black wires are touching
24
Order the CHEM SEP steps
1: Put diethyl ether test tubes 2: Create a sep strategy 3: Use scan spectr
1: Empty coloured diethyl ether 2: Drain aqueous layer 3: Waste in funnel
1: Drain aqueous layer 2: Record layer dye settles 3: Acetone organic waste
25
When does calcon change colour (turn blue)
When it is deprotonated
When it is bound to metal ions
When it is bound to EDTA
When it is not bound to metal ions
26
What is a coordinate bond?
A covalent bond between metals
An ionic bond between metals
A covalent bond where one species provides all the electrons
An ionic bond where both species donate and receive the electrons
27
The oxygen anions are oxidizing agents
True
False
28
What is a biphasic mixture
A mixture made of two miscible phases
A mixture made of two immiscible phases
29
Wavenumber is inversely proportional to frequency
False
True
30
What will have a peak at the highest wavenumber?
An sp3-hybridized carbon bound to 2 carbons and 2 hydrogens (no lone pairs)
A carbon-oxygen double-bond
An sp2-hybridized carbon bound to two carbons an a hydrogen (no lone pairs)
A carbon-chlorine bond
31
AES uses light emission to determine the composition and concentration of the elements that make up a sample
True
False
32
Order the steps for IR Plastics
1allow background to be recorded 2wipe plastic with KimWipe 3label spectrum
1: go to IR room 2: identify key peaks 3: remove sample
1: cut samples 2: wipe the crystal 3: print the spectrum

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