Chemistry Flashcards by Nghi Cao

Q

What’s the formula for Dalton’s law

A

Pgas = XgasPtotal ; Xgas = n gas/ n total

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Q

gases conversion for 1 atm –> mmHg –>

A

760 mmHG; 10^5 Pa

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Q

A climber using bottled oxygen accidentally drops the oxygen bottle from an altitude of 4500 m. If the bottle fell straight down this entire distance, what is the velocity of the 3 kg bottle just prior to impact at sea level?

A

use 1/2mv^2 = mgh to solve

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Q

why does volume and densities of gas is not constant like fluid and solids?

A

because gas is compressible

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Q

Warm air holds (more/less) H2O than cold air?

A

more

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Q

Define positive control

A

a control group that is not exposed to the experimental etreatment but t

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Q

what is this functional group?

A

Amine

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Q

What is this functional group?

A

Amide

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Q

What is this functional group?

A

Imine

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Q

What is this functional group?

A

Thioether

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Q

What is this functional group?

A

Ester

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Q

What is this functional group?

A

Anhydride

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Q

When 2 moles of HF are added to 100 mL of water, the resulting solution has a pH equal to 4. What is the percent dissociation of HF?

A

KNOW that percent dissociation is [H+]/[HF] x 100%.

You need to find the molarity of HF then the [H+] is 10^-4 M

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Q

Equation for power : If the bicep exercises last 5 minutes, what is the total work performed by the patient’s muscle?

A

P = W / T

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Q

Equation for work energy theorem: An object with a mass of 10 kg is rolled down a frictionless ramp from a height of 3 meters. If a fasctory worker at the bottom of the ramp slows the object until it stops. How much work must the factory worker have done?

A

Wnet = KEnet ; or Wnet = mgh in this case because KE is from PE.

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Q

Formula for wavelength of a photon

A

ALWAYS convert eV energy to J before calculating
E=hc/wavelegnth
1 eV to J will be given

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Q

Equation for half lives

How much of a sample is lost ?
How much of a sample remain?

n = number of half life

A

Sample lost = 1- 1/2^n

Sample remain = 1/2^n

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Q

What is radioactive decay?

A

The spontaneous transformation from one element to another by changing the protons

IRREVERSIBLE

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Q

What is Alpha decay ?

A

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Q

What does Gamma decay look like ?

Study These Flashcards

A

Q

What is the formula for beta decay ?

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A

Q

What is beta minus?

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A

A neutron is converted into a proton and a beta particle ( electron) is emitted = charge preserved

Q

What is electron capture ?

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A

The nucleus grabs an electron which changes a proton into a neutron

Q

what type of group ( Electron withdrawing/donating) will increase the ka of a functional group like carboxylic acid?

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A

Electron withdrawing groups ( F, Cl, S, N, S=O, NO2R ,etc)

what property of electron withdrawing groups increases the acidity of the compound ?

Inductive effect

What is suicide inhibtion of enzyme binding?

When an enzyme binds the inhibitor and forms an irreversible complex with it

where is the pka of carboxylic acid and Amine on the titration curve?

formula for centripedal force?

What is the mechanical advantage of using the ramp, as opposed to lifting the gurney straight up?

KNOW the formula MA = hypotenuse / height KNOW right triangles, and side ratios for example: 30, 60, 90 will have the sides x: sqr 3: 2x Info given is 30 degrees so you know it has to be 30,60,90 MA = 2x/x = 2

In a follow- up experiment, two identical gurneys are placed side – by -side on a ramp with their wheels locked to eliminate spinning. Gurney 1 has a dummy placed on it to give it a total mass of 200 kg, while Gurney 2 is loaded with a dummy that makes it only 50 kg overall. If the ramp has a coefficient of friction of Us, which gurney is more likely to slide down the ramp?

KNOW the forces on a ramp Gravity = mgsin(theta) Friction =uN = u mgcos(theta), u = static friction Know that in order for the gurney to slide down the force of gravity has to be greater that the force of static friction Fnet = gravity – friction ; ma = gravity – friction ; if Fnet \> 0 then it will slide down The mass will cancel out in every term so you don’t need to worry about the mass ANSWER: Two gurney 1 and gurney 2 will equally likely to slide

define isomers

compounds have the same molecular formula

define constitutional isomer

Compounds DON'T have the atoms connected in the same order

define stereoisomers

compounds HAVE the atoms connected in the same order

what stereoisomers can be interconverted by rotation around a single bond?

Conformational

what type of stereoisomers can NOT be interconverted by rotation about single bonds?

Configurational

A circuit is comprised of a 12 – volt battery with three light bulbs **with the same resistance. If** two of the light bulbs are wired in parallel and are in series with the third light bulb, what happens when one of the parallel light bulbs is unscrewed?

disconnect the parallel = one parallel will still stay lit

How do you add current in parallel and current in series ?

Parallel = add directly Series = I1= I2 = I 3 ....

How do you add voltage? in series and in parallel?

how do you add resistance in series and in parallel?

how to calculate capacitance?

Q= VC

what is Ohm's law formula?

V= IR and Power = IV

Air is bubbled through distilled water. The solution will have a pH of :

ANS: less than 7 , because CO2 undergoes undergoes hydrolysis

What is the approximate pH of a saturated aqueous solution of hydrochloric acid whose molarity is 10.6 M ?

pH = -1 becuase HCl = strong acid = fully dissociate

Non polar or polar molecules will have the highest Rf value on TLC plate?

- KNOW silica plate = polar = POLAR molecule will move SLOWER = SMALL Rf - KNOW non polar = move faster - HIGHER Rf

If I want to select an inert molecules that will not interact with my acid/basis reagent, then what will it be?

benzene

For any two charged particles moving in the same direction through a magnetic field of a constant strength, the faster moving charged particle will experience a greater magnetic force T/F

False- you have to know the charge of these particles to know how fast they go. However, incrase velocity does mean increase magnetic force F_b= qvBsin(theta)