October 2022 Day 1 Flashcards
Which does not contain all C, N, H, and O
A. Ascorbic acid
B. Sulfanilamide
C. Diazepam
D. Valium
A. Ascorbic acid
At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 100 deg C?
Gagamiting formula:
v=(Sqrt of kRT/M)
T∝M because k and v are constant
Therefore,
T(Hydrogen, g)/T(Oxygen, h)=M.W(Hydrogen, g)/M.W(Oxygen, g)
Let T(Hydrogen, g)=X
X/(100+273.15)=2/32
X=23.2K or -249.7 deg C
What is the color change of litmus paper when used in basic solution?
Blue
Who theorized stars collapsing into blackhole as it increases entropy?
Hawking
Who discovered helium?
Nasa periodic table pero wala sa choices ang sagot. Ang pinaka malapit ay
Ramsay and Travers
Question about sa work ng copper bar. From 20° to 50°C. 1 kg yung copper bar
-1.74x10^-5 kJ
Elements used by plants in making carbohydrates during photosynthesis
CO2 and H2O
What compound if dehydrated forms water?
Propene
When traveling at NLEX at 80 mph, a stopped car in front causes you to suddenly skid to stop. What happened to the kinetic energy of the moving car?
All of it was transferred to the road and surroundings.
Determine whether the following statements are true or false.
A. For all adiabatic processes, the entropy change of the system must be zero.
B. For one component system, it is possible for two phases in equilibrium to have different chemical potentials.
C. The change in Gibb’s free energy can be negative for a cyclic process.
D. A condition for equilibrium is that (deltaA) T, F=0
F, F, F, F
Di raw sure. Pero pag nafind out niyo, you can inform me para mapalitan natin dito
Tao about sa entropy XD
Gibbs and Boltzmann
pag nagdive 50 m below, anong weight ratio ng Helium to Oxygen sa tank (naghanap lang ako ng similar problem sa google so di ko sure kung ito talaga ‘yon)
Assume a diver breathes a mixture of Oxygen and Helium. By weight, what ratio of helium to oxygen must be used if the diver is at an ocean depth of 50 meters?
0.176
What is the most oxidized form of nitrogen-fixing bacteria?
A. Nitrate
B. Ammonia
C. NO
D. NO2
A. Nitrate
How many different tetrapeptides can be made (a) if the peptides contain the residues of asparagine, proline, serine, and methionine and (b) if all 20 amino acids can be used?
256 and 160,000
What are sigmatropic rearrangements in organic reactions?
A.They are similar to the ‘(3, 3 ) Cops rearrangement where the beta ring of a steroid undergoes photos activated retro
electrocyclization.
B. They are thermal reactions which do not allow the formation of six membered benzene ring with a cis-or trans-alkene, such as in the formation of vitamin D3.
C. They are different from electrolytic reactions wherein movement of a sigma bond with a simultaneous rearrangement of the pi-system does not occur.
D. They are not the same to the (3, 3) cope arrangement and the beta ring does not undergo photon activated retro electrocyclization.
C. They are different from electrolytic reactions wherein movement of a sigma bond with a simultaneous rearrangement of the pi-system does not occur
